HHWT-486670 OMEGA | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 20
Technical content
e-mail: info@omega.com For latest product manuals: omegamanual.info HHWT-12 Handheld Photometer Direct Read Tests Shop online at omega.com® User’s Guide
Servicing North America: ISO 9001 Certified Stamford, CT 06907-0047 USA Toll Free: 1-800-826-6342 TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec), H7L 5A1 Canada Toll-Free: 1-800-826-6342 TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca For immediate technical or application assistance: U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA® Customer Service: 1-800-622-2378/1-800-622-BEST® Engineering Service: 1-800-872-9436/1-800-USA-WHEN® Mexico/ En Español: 001 (203) 359-7803 FAX: 001 (203) 359-7807 Latin America: info@omega.com.mx e-mail: espanol@omega.com Servicing Europe: Benelux: Managed by the United Kingdom Office Toll-Free: 0800 099 3344 TEL: +31 20 347 21 21 FAX: +31 20 643 46 43 e-mail: sales@omegaeng.nl Czech Republic: Frystatska 184 733 01 Karviná, Czech Republic Toll-Free: 0800-1-66342 TEL: +420-59-6311899 FAX: +420-59-6311114 e-mail: info@omegashop.cz France: Managed by the United Kingdom Office Toll-Free: 0800 466 342 TEL: +33 (0) 161 37 29 00 FAX: +33 (0) 130 57 54 27 e-mail: sales@omega.fr Germany/Austria: Daimlerstrasse 26 D-75392 Deckenpfronn, Germany Toll-Free: 0800 6397678 TEL: +49 (0) 7056 9398-0 FAX: +49 (0) 7056 9398-29 e-mail: info@omega.de United Kingdom: OMEGA Engineering Ltd. ISO 9001 Certified One Omega Drive, River Bend Technology Centre, Northbank Irlam, Manchester M44 5BD United Kingdom Toll-Free: 0800-488-488 TEL: +44 (0) 161 777-6611 FAX: +44 (0) 161 777-6622 e-mail: sales@omega.co.uk OMEGAnet® Online Service Internet e-mail omega.com info@omega.com It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification. The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice. WARNING: These products are not designed for use in, and should not be used for, human applications.
Index: Parameter Page MENU Free Chlorine (DPD-1) 6 CL1 Permanganate (DPD-1) 6 CL1 Total Chlorine (DPD-3) 6-7 CL1 Ozone (DPD-4) 8 CL1 Total Chlorine (DPD-4) 8 CL1 Nitrite (as NO2) 8 NO2 Nitrate (as NO3) 9 NO3 pH 9 PH4 Bromine (DPD-1) 10 BR5 Total Alkalinity 10 AL6 Total Hardness (as CaCO3) 11 TH7 Copper 11 CU8 High Range Chlorine (HRC) 12 HR9 Transmission Procedure 12 TR0 6SHFL¿FDWLRQV About Your Photometer 5 USEPA Compliance 5 Reference Standard Procedure 13 Tips for Best Accuracy 14 Battery Installation 15 Reorder Information 16 NOTES 18 IDEAL FOR DRINKING WATER, POOLS AND SPAS, ENVIRONMENTAL, & EDUCATIONAL TESTING HHWT-12 Advanced Photometer System This manual covers direct read tests only. For instructions and tables for HHWT-12 transmission tests consult manual M-5282 available at Omega.com/manuals
F E D C B A G H ITEM PICTURED LETTER COMPONENT NAME A Mixing Cap/Cell Cover B Cell (Built-in Plastic, 4mL) C LCD Display D READ Button E MENU Button F ZERO/ON Button G Battery Cover with loop for lanyard H AAA Batteries (x4) (Included) (Used for Cyanuric Acid, Iron, and Manganese tests, and when testing outdoors) ++:70HWHU6SHFLÀFDWLRQV Measurement Method: Photometric Light Source: /LJKW(PLWWLQJ'LRGH /(' ZLWKSUHFLVLRQ¿OWHU Wavelength: 525 nm Transmission Range: 100 - 0.00 %T Photometric Precision: +/- 0.1/0.01 %T Automatic Range Selection: 6HH6SHFL¿FDWLRQVEHORZ Display: 3-digit customized liquid crystal display with annunciators CELL Pathlength: 20mm Reagent System: Utilizes patented reagent delivery system Cell Chamber: Custom-molded, proprietary, PET plastic IXVHGLQWRFKDPEHUQRQUHPRYDEOH Sample Required: 4mL (0.13 oz) Operating Temperature Range: 0 - 50°C (32° - 122°F) Power Supply: $$$DONDOLQHEDWWHULHV ,QFOXGHG Battery Life: !WHVWVZLWKDONDOLQHEDWWHULHV Electromagnetic Compliance: (PLWWHG,QWHUIHUHQFH(1 (EMC) ,PPXQLW\\WR,QWHUIHUHQFH(1 Waterproof Rating: ([FHHGV,3 Weight: ,QVWUXPHQW J ZLWKEDWWHULHV Dimensions: ,QVWUXPHQW FP [[LQ HHWT-12 KDVEHHQGHVLJQHGWRRIIHUWKHXVHUDPRUH³*UHHQ´DQGFRVWHIIHFWLYHDOWHUQDWLYHWRWHVWLQJ,QVWHDGRIXVLQJ a 10mL water sample, HHWT-12 XVHVDP/ZDWHUVDPSOHZKLFKXVHVXSWROHVVFKHPLFDOSHUWHVW7KHDFFXUDF\\ RIWKHPHWHULVPDLQWDLQHGE\\GHVLJQLQJWKHSKRWRFHOOZLWKDPPSDWKOHQJWK :HRIIHUD´*UHHQµ$OWHUQDWLYH 3HUIRUPDQFHYHUL¿HGZLWKYDULRXVVDOWV\\VWHPVDQGZDWHUVDPSOHVZLWKRSWLPDOZDWHU WHPSHUDWXUHDWÛ&Û) 2SWLPDOZDWHUWHPSHUDWXUHIRU7RWDO$ONDOLQLW\\WHVWLVÛ& 0HDVXUHPHQWUHTXLUHVDFRQYHUVLRQFKDUWIRUYDOXH9LVLWRXUZHEVLWHIRUPRUHGHWDLOV ++:76SHFL¿FDWLRQV R020613 CL1 NO2 NO3 PH4 bR5 AL6 TH7 CU8 HR9 TR0 )UHH&KORULQH '3' 7RWDO&KORULQH '3' 1LWULWH 1LWUDWH Bromine 7RWDO$ONDOLQLW\\ 7RWDO+DUGQHVVDV&D&2 &RSSHU +LJK5DQJH&KORULQH 7UDQVPLVVLRQ XVHGIRURWKHUWHVWSDUDPHWHUV SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP 0HQX 7HVWIRU 5DQJH 5HVROXWLRQ $FFXUDF\\ (±%)
About Your HHWT-12 Instrument In order to save power, the meter is designed to turn off after 3 minutes (timed from the last button pressed). Should the meter turn off in the middle of a test, the last stored zero in the meter will remain valid when the meter is turned on again. Also, the test result is stored in memory for easy retrieval. The HHWT-12 meter is controlled by three buttons: 1. ZERO/ON :KHQ¿UVWSUHVVHGWKLVEXWWRQWXUQVWKHPHWHURQ:KHQWKHPHWHULVRQDQGWKLVEXWWRQLV pressed, it zeroes the sample in the cell. Once the meter is zeroed, this zero value applies to all parameters and is stored and retained even when meter turns off. However, it is recommended that each new water sample analyzed is zeroed before testing, to maximize sensitivity and accuracy. 2. MENU: With each press, the MENU button advances through the tests in the following sequence: CL1, NO2, NO3, PH4, BR5, AL6, TH7, CU8, HR9, TR0. Each test menu can store up to 20 results. To retrieve the stored results, go to the desired test using the MENU key. When the desired test is displayed, press and hold down the MENU key. Continue holding down the MENU key to scroll the stored results for that test, starting with the most recent result. The meter will display, from memory, the last 20 readings in sequence beginning with -20, which is the latest result, followed by -19, which is the 2 ndODWHVWUHVXOWHWF DQG¿QDOO\\ which is the oldest result retained. Only the last 20 readings are stored in each menu. This meter is able to store 200 results in memory (20 in each menu). 3. READ: When pressed once, this button starts the timer for the parameter being tested. When pressed a second time the meter exits the timer and immediately prepares to colorimetrically measure the sample, and simultaneously stores the measurement in memory. If the parameter being measured is below or above the detection range, the display will show “LO” (Under Range) or “HI´ 2YHU5DQJH UHVSHFWLYHO\\7KLVIHDWXUHLVPHQXVSHFL¿FDQGGRHVQRWDSSO\\WRDOOSDUDPHWHUV AWWA 4500-Cl G DPD-1 Anhydrous DPD sulfate Anhydrous Na2HPO4 Anhydrous KH2PO4Na2 EDTA 1.5% 33.4% 64.0% 1.1% 1.5% 33.4% 64.0% 1.1% Component (Free Chlorine) About the Accuracy / Calibration of the System $OOWHVWVKDYHEHHQFDOLEUDWHGXVLQJFHUWL¿HGUHIHUHQFHVWDQGDUGVDQGVWDQGDUGDQDO\\WLFDO VSHFWURSKRWRPHWULFPHWKRGV7KHDOJRULWKPVLQWKHVRIWZDUHUHÀHFWWKHEHVWFRUUHODWLRQRIWKH++:7 Systems against the AWWA, US EPA , DIN, and ISO reference test methods for chlorine. Studies show that the HHWT-12 System repeatedly agrees with an EPA Compliant reference method greater than 99% 2= 0.99948, 0 - 5.00 ppm - see back cover). The HHWT-12 Advanced Photometric System has been IDFWRU\\FDOLEUDWHGIRU\\RXUFRQYHQLHQFH<RXFDQH[SHFWWKH¿[HGFDOLEUDWLRQVLQWKHPHWHUWREHYDOLGIRU the life of the meter because of the quality, Long-Life LED, the photo cell, and the software as written into the meter. This is why the meter comes with a 1-Year Warranty. &RPSOLDQFH9HULÀFDWLRQIRU)UHHDQG7RWDO&KORULQH7HVWLQJ This DPD test system is accepted by most health departments because this test is USEPA (DIN Standard 38 408 G4, ISO 7393/2) accepted for testing requirements for Free and Total Chlorine. The HHWT-12 meter uses a wavelength of 525nm; and the compliance requirement is that the colorimeter wavelength is between 490 and 530nm. The HHWT-486637 (DPD-1) uses the same reagents and SURSRUWLRQVDQGWKHUHVXOWLQJVROXWLRQS+LVPDLQWDLQHGEHWZHHQDQGDVVSHFL¿HGE\\$::$ (American Water Works Association) method 4500-Cl G. It should be understood that the USEPA does not "approve" commercial DPD delivery systems such as reagent powder pillows, tablets, dispensers, or strip DPD delivery devices. The HHWT-486637 (DPD-1) for Free Chlorine, and the HHWT-486638 (DPD-3) or the HHWT-486670 (DPD-4) for Total Chlorine meet your reportable testing requirements because each strip delivers the same chemicals in identical proportions (see table below); therefore, the system is compliant. Likewise, AWWA proportions are followed as required for Total Chlorine measurements using Potassium Iodide.
DPD-1 Free Chlorine Test Procedure Remove one (1) HHWT-486637 for Free Chlorine or HHWT-486626 for Permanganate from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP1 Press the ZERO/ON button to power the meter on; the display will show all annunciators, then the current MENU selection, followed by the last reading. TURN METER ON2 Dip the strip into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the strip after “1” on the display disappears. DIP STRIP AND PRESS “READ”6 Press the ZERO/ON button. The cursor will move across the display followed by 0.00 PPM. Sample is ready for testing. ZERO METER5 Rinse the CELL at least 3 times with the water sample you will be testing - rinsing minimizes the potential for FURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OO cell to capacity (4mL) with the water sample. RINSE AND FILL CELL WITH SAMPLE4 Press and re-press the MENU button until the display shows the parameter CL1. CL1 is also used for testing: Total Chlorine (DPD-4), Ozone (DPD-4), Permanganate (DPD-1), and Total Chlorine (DPD-3). (Contact OMEGA for specs and details if you are planning on using CL1 for Permanganate or Ozone measurements) SELECT TEST: CL13 CLCL1 The cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is automatically stored in CL1). RECORD RESULT DISPLAYED7 DO NOT discard the sample from the Free Chlorine test if you are planning to run HHWT-486638 (Total Chlorine) Procedure. Move directly to steps 8-10 on page 7. Otherwise, rinse the cell immediately.
DPD-3 Total Chlorine Test Procedure This procedure is only valid when run as a continuation of the HHWT-486637 (DPD-1 Free Chlorine ) Test Procedure located on the previous page. 8 Remove one (1) HHWT-486638 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP
10 PRESS READ AGAIN
Press READ again and the meter will count down and display the next reading. If this reading matches the previous result, then record this as the Total Chlorine result. This value is automatically stored in CL1. After testing is completed, rinse cell immediately. Record the Total Chlorine as the highest value the meter displayed. 9 Dip the HHWT-486638 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the strip when “1” on the display disappears. The cursor will move across the display while the meter prepares to measure the sample. This result is automatically stored in CL1 (NOTE: The Iodide added with DPD-3 will, in the presence of Combined Chlorine or Chloramines, convert into Iodine). DIP STRIP AND PRESS “READ” *NOTE: Standard Method (4500-Cl G, procedure for total chlorine) requires the reading to be made after 2 minutes from the time the KI is added. For compliance testing, you must time the two minutes and then make your measurement. NOTE: From testing in our lab, water samples above 70°F (20°C), generally, reach a stabilized reading quicker then 2 minutes. Test Strip (DPD-1/DPD-3/DPD-4) Interferences Interfering Substance Acidity Alkalinity Bromine & Bromamines, Br Chlorine Dioxide, ClO2 Copper, Cu+2 Iodine, I2 Manganese, oxidized (Mn+4, Mn+7) or Chromium, oxidized (Cr+6) Monochloramines (NH2Cl) (applies to DPD-1 only) Ozone, O Peroxides pH Interfering Levels & Treatments If sample has acidity above 150mg/L CaCO 3 test may not develop If sample has alkalinity above 200mg/L CaCO 3 test may not develop Color similar to free chlorine reaction at all levels. Color similar to free chlorine reaction at all levels. Color development is reduced above 10 ppm (mg/L). Color similar to free chlorine reaction at all levels. See AWWA procedure 4500-CL F, 1(d) for removal of interferences. Monochloramine interferences are known to occur in free chlorine DPD methods. This interference is dependent on temperature and monochloramine concentration. Color similar to free chlorine reaction at all levels. Interference is possible. Typical pH samples of potable water with a pH of 6.0 to 9.0 are OK. If outside this range adjust to pH 6.0 to 7.0 using acid (0.5N Sulfuric acid) or base (0.5N Sodium hydroxide). CL CL1 CL1: Chlorine reacts with N,N-diethyl-p-phenylenediamine as it is released from the strip to form a magenta color, directly proportional to the Chlorine concentration. (Ozone, Bromine, and Permanga- nate also form the color)
6 Dip the HHWT-486623 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion (approx. 2 strokes/Sec). Remove and discard the strip after “1” on the display disappears*. The Meter will automatically start to count up for 360 seconds (6 minutes). After the 360 seconds, the cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is automatically stored in NO2 Menu). After testing, rinse cell immediately. *NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display followed by 0.00 PPM. The sample is ready for testing. ZERO METER*
4 Rinse the CELL at least 3 times with the water sample you will be testing - rinsing minimizes
WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE 3 Press and re-press the MENU button until the display shows the parameter NO2. SELECT TEST: NO2
2 Press the ZERO/ON button to power the meter on; the display will show all annunciators,
then the current MENU selection, followed by the last reading. TURN METER ON 1 Remove one (1) HHWT-486623 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP Nitrite Test Procedure NOTE:6WDQGDUG0HWKRG &O*SURFHGXUHIRUWRWDOFKORULQH UHTXLUHVWKHUHDGLQJWR be made after 2 minutes. 2 minute wait is not necessary for Ozone measurements. 6 Dip the strip into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the strip after “1” on the display disappears*. The cursor will move across the display while the meter prepares to PHDVXUHWKHVDPSOH5HFRUGUHVXOWGLVSOD\\HG WKLVUHVXOWLVDXWRPDWLFDOO\\VWRUHGLQ&/0HQX DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.00 PPM. Sample is ready for testing. ZERO METER* 7 Press READ again and the meter will count down and display the next Total Chlorine result. If this reading matches the previous result, then record this as Total Chlorine value (this result is stored LQ&/ $IWHUWHVWLQJLVFRPSOHWHGULQVHFHOOLPPHGLDWHO\\5HFRUGWKH7RWDO&KORULQHDVWKHKLJKHVW value the meter displayed. PRESS READ AGAIN WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE 3 Press and re-press the MENU button until the display shows the parameter CL1. SELECT TEST: CL1 then the current MENU selection, followed by the last reading. TURN METER ON
1 Remove one (1) HHWT-486670 for Total Chlorine or HHWT-486634 for Ozone from the bottle
before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP DPD-4 (Total Chlorine or Ozone) Test Procedure
1 Remove one (1) HHWT-486655 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP 6 Dip the HHWT-486655 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion (approx. 2 strokes/sec). Remove and discard the strip after “1” on the display disappears*. The meter will automatically start to count up for 600 seconds (10 minutes). After the 600 seconds, the cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is stored in NO3 Menu). After testing, rinse cell immediately with brush and water. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.00 PPM. The sample is ready for testing. ZERO METER*
2 Press the ZERO/ON button to power the meter on; the display will show all annunciators, then
the current MENU selection, followed by the last reading. TURN METER ON 3 Press and re-press the MENU button until the display shows the parameter NO3. SELECT TEST: NO3 4 Add sample water to the CELL and use brush to remove any zinc from previous tests. Rinse the CELL at least 3 times with the water sample you will be testing - rinsing minimizes the SRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE - See Accuracy Tip 19 on page 15 NO3 NO3 PH PH4 6 Dip the HHWT-486639 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion (approx. 2 strokes/Sec). Remove and discard the strip after “1” on the display disappears*. The cursor will move across the display while the meter prepares to measure the sample. Record result GLVSOD\\HG WKLVUHVXOWLVDXWRPDWLFDOO\\VWRUHGLQ3+0HQX $IWHUWHVWLQJULQVHFHOOLPPHGLDWHO\\ 127( )RUEHVWUHVXOWV7RWDO$ONDOLQLW\\RIWKHVDPSOHVKRXOGEHSSP *NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. When the display shows 0.0 PH, the sample is ready for testing. ZERO METER* WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE 3 Press and re-press the MENU button until the display shows the parameter PH4. SELECT TEST: PH4 then the current MENU selection, followed by the last reading. TURN METER ON 1 Remove one (1) HHWT-486639 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP pH Test Procedure
Bromine DPD-1 Test Procedure 1 Remove one (1) HHWT-486636 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP 6 Dip the HHWT-486636 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion (approx. 2 strokes/sec). Remove and discard the strip after “1” on the display disappears*. The cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is stored in bR5 Menu). After testing, rinse cell immediately. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.00 PPM. The sample is ready for testing. ZERO METER* the current MENU selection, followed by the last reading. TURN METER ON 3 Press and re-press the MENU button until the display shows the parameter bR5. SELECT TEST: bR5 WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE 1 Remove one (1) HHWT-486641 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP 6 Dip the HHWT-486641 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion (approx. 2 strokes/sec). Remove and discard the strip after “1” on the display disappears*. NOTE: For water temperatures above 95°F/35°C (hot tubs), remove and discard the strip when the timer displays “10”, countdown continues. For the hot water samples, a 10-second dip time is best. The cursor will move across the display while the meter prepares to measure the sample. Record result displayed WKLVUHVXOWLVDXWRPDWLFDOO\\VWRUHGLQ$/0HQX $IWHUWHVWLQJULQVHFHOOLPPHGLDWHO\\ *NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.00 PPM. The sample is ready for testing. ZERO METER* the current MENU selection, followed by the last reading. TURN METER ON
3 Press and re-press the MENUEXWWRQXQWLOWKHGLVSOD\\VKRZVWKHSDUDPHWHU$/
SELECT TEST: AL6 WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE Total Alkalinity Test Procedure bR5 AL AL6
Total Hardness Test Procedure 1 Remove one (1) HHWT-486673 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP 6 Dip the HHWT-486673 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the strip after “1” on the display disappears*. The cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is automatically stored in TH7 Menu). After testing, rinse cell immediately and use brush to remove any residual from previous test. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.00 PPM. The sample is ready for testing. ZERO METER* then the current MENU selection, followed by the last reading. TURN METER ON 3 Press and re-press the MENU button until the display shows the parameter TH7. SELECT TEST: TH7
4 Rinse the CELL 2 or 3 times with the water sample you will be testing - rinsing minimizes the
SRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE 1 Remove one (1) HHWT-486632 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP 6 Dip the HHWT-486632 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the strip after “1” on the display disappears*. The display will immediately start counting up from 1 to 20 (this extra time allows more thorough color development). At 20 sec, the cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is automatically stored in CU8 Menu). After testing, rinse cell immediately. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.00 PPM. The sample is ready for testing. ZERO METER* then the current MENU selection, followed by the last reading. TURN METER ON 3 Press and re-press the MENU button until the display shows the parameter CU8. SELECT TEST: CU8 WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE Copper Test Procedure *NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample. THTH7 CUCU8
6 Dip the HHWT-486672 into the CELL and immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the strip after “1” on the display disappears*. The display will immediately start counting up from 1 to 120 (this extra time allows more thorough color development). At 120 sec, the cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is automatically stored in HR9 Menu). After testing, rinse cell immediately with brush and water. DIP STRIP - (read carefully and follow procedure closely) 5 Press the ZERO/ON button. The cursor will move across the display, followed by 0.0 PPM. The sample is ready for testing. ZERO METER* the current MENU selection, followed by the last reading. TURN METER ON 3 Press and re-press the MENU button until the display shows the parameter HR9. SELECT TEST: HR9 WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE High Range Chlorine Test Procedure HR HR9 1 Remove one (1) HHWT-486672 from the bottle before beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP *NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample. TR TR0 6 Dip the Test Strip (or add Reagent) into the CELL immediately press READ. This starts the 20 SECOND countdown timer. During this time move the strip in a gentle back and forth motion. Remove and discard the after “1” on the display disappears*. The cursor will move across the display while the meter prepares to measure the sample. Record result displayed (this result is automatically stored in TR0). After testing is completed, rinse cell immediately. DIP STRIP AND PRESS “READ” 5 Press the ZERO/ON button. The cursor will move across the display, followed by 100 %T. The sample is ready for testing. ZERO METER* WKHSRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWK the water sample. FILL METER WITH SAMPLE 3 Press and re-press the MENU button until the display shows the parameter TR0. Tests listed on page 17 will require the use of a conversion chart available on our website. SELECT TEST: TR0 then the current MENU selection, followed by the last reading. TURN METER ON
1 Remove one (1) test strip, part number is dependent upon the test being run, from the bottle before
beginning the test. Set the strip in a dry, convenient place and recap the bottle immediately. REMOVE STRIP Transmission Test Procedure For complete instructions on HHWT-12 Transmission Test Procedures with Tables, consult manual M-5282 available at Omega.com/manuals
How to use Reference Standard Ampoules CL1
1 Press the ZERO/ON button to power the meter on; the display will show all annunciators,
then the current MENU selection, followed by the last reading. TURN METER ON 2 Press and re-press the MENU button until the display shows the parameter CL1. SELECT TEST: CL1
3 Rinse the CELL at least 3 times with distilled or deionized water - rinsing minimizes the
SRWHQWLDOIRUFURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\\¿OOFHOOWRFDSDFLW\\ ZLWKWKH distilled or deionized water. RINSE AND FILL CELL WITH DISTILLED OR DEIONIZED WATER 5 Break open one Reference Standard Ampoule, Part No. HHWT-486602, in a safe manner by gripping with a paper towel. NOTE: Do not break open at poolside or around children or pets. DO 127&21680(62/87,21 BREAK OPEN REFERENCE STANDARD AMPOULE NOTE: The Reference Standard, Part No. HHWT-486602, can be used for verifying the performance of the HHWT-12 and HHWT-11 meters.
4 ZERO METER*
Press the ZERO/ON button. The cursor will move across the display followed by 0.00 PPM. 'LVFDUGWKLVZDWHUVDPSOHIROORZHGE\\DTXLFNVKDNHRIWKHPHWHUWRHPSW\\WKH&(//RIWKH remaining water drops.
6 RINSE AND FILL CELL WITH REFERENCE STANDARD
Take the plastic pipette supplied, squeeze the bulb to expel air, dip the pipette tip to the bottom of the DPSRXOHDQGUHOHDVHWKHEXOEVORZO\\WR¿OOWKHSLSHWWH7UDQVIHUWKHSLSHWWH¶VOLTXLGWRWKHSKRWRPHWHU &(//'LVFDUGWKLVVDPSOHZLWKDTXLFNVKDNHRIWKHPHWHUWRHPSW\\WKH&(//8VHWKHSLSHWWHWRUH¿OO WKH&(//ZLWKWKH5HIHUHQFH6WDQGDUG
7 PRESS “READ”*
Press READ to start the 20 SECOND countdown. After 20 seconds, the cursor will move across the display while the meter prepares to measure the sample. Verify the displayed value against the ³$VVLJQHG9DOXH´SURYLGHGEHORZ,I\\RXUUHVXOWLVRXWVLGHWKH$FFHSWDEOH9DOXHUDQJHGLVFDUGWKH 5HIHUHQFH6WDQGDUGVDPSOHLQWKH&(//DQGUHSHDW6WHSVDQG6WHS,I\\RXFRQWLQXHWRREWDLQ results outside the Acceptable Value range, call for technical support. *127( :KHQWHVWLQJRXWGRRUV VXQOLJKW IRUEHVWDFFXUDF\\XVHWKH0L[LQJ&DS&HOO&RYHUZKHQ=HURLQJDQG5HDGLQJWKHVDPSOH Assigned Value for HHWT-486602 (lot 505) Solution Parameter Desired Value (ppm) Acceptable Value (ppm) Free Chlorine 1.35 1.28 - 1.42 R02011356;,!=HS\\LZYLÅLJ[J\\YYLU[JVUJLU[YH[PVUZHZ MV\\UKH[[PTLVMTHU\\MHJ[\\YLHUKTH\`JOHUNL ^P[OJVUZLJ\\[P]LSV[Z
- 11. 12. 13. 14. 15. 16. 17. 18. Become familiar with the meter and the different tests by reading the instructions carefully. The Free Chlorine, Combined Chlorine, and Total Chlorine reagents are compliant for meeting USEPA (4500-Cl G); ISO 7393/2; and German DIN 38408 G4-2 requirements. Observe the dip time (as required for the test) for accurate results. 7HVWLPPHGLDWHO\\DIWHU¿OOLQJWKHCELL with water sample when testing for oxidizers such as Chlorine and Bromine (Ozone can be measured in CL3 MENU). Be sure the CELL LV¿OOHGWRFDSDFLW\\ HVSHFLDOO\\IRUS+DQG7RWDO$ONDOLQLW\\ Rinse the CELL with clean water immediately after completing each test. Some reagents may stain the CELL if not rinsed shortly after use. Other reagents including Cyanuric Acid, Chloride, DQG&DOFLXP+DUGQHVVPD\\FRDWWKH&(//ZDOO,WLVUHFRPPHQGHGDIWHUWKHVHWHVWVWRXVHWKH Cell Cleaning Brush with water to clean the CELL. Just before testing, rinse the sample CELL with the sample water several times to get a representative sample. (Use deionized or distilled water for rinsing if you have a limited amount of sample). Store the meter and all test materials out of direct sunlight and away from chemical storage areas. Minimize exposure of meter and test reagents to heat above 32°C (90°F). Dry the outside of the meter when testing is complete or before storage of the meter. When running a DPD-1 Free Chlorine test AFTER a Total Chlorine DPD-3, a Total Chlorine '3'RUD+5&KORULQHWHVWULQVLQJLVYHU\\LPSRUWDQWWRUHPRYHUHVLGXDO.,ZKLFKPD\\LQWHUIHUH Each test strip is valid for ONLY one test. Discard strip after single use in regular refuse that is inaccessible to children and pets. Each bottle of test strips contains the quantity of strips notated on the bottle. Due to the strip VOLWWLQJSURFHVV\\RXPD\\¿QGRQHRUWZRVWULSVWKDWDUHQRWLFHDEO\\VPDOOHURUODUJHULQZLGWKWKDQ the normal strips in the bottle. These should be discarded. Using these strips may give unreliable results. 7KH++:70HWHULVQRWFRPSDWLEOHIRUXVHZLWK'3''3'DQG'3'SRZGHUSLOORZV tablets, and liquids available from other manufacturers. Accurate results can only be guaranteed by using genuine OMEGA strips or reagents (reorder information on page 17). 2XUODEWHVWLQJZLWKWKH++:7PHWHUKDVVKRZQWKDW]HURLQJDQGPHDVXULQJRIWKHVDPSOH normally does not require any cell cover for accurate results, except in sunlight. To obtain optimal accuracy when testing with the meter outdoors (sunlight), use the Mixing Cap/Cell Cover when zeroing and reading the sample. Remove batteries when meter is not used for more than a month (Warranty Requirement). ,WLVUHFRPPHQGHGWKDW3RRODQG6SDVDPSOHVIRUR[LGL]HUV VXFKDV&KORULQH EHWDNHQLQFKHV below the surface as follows: submerge meter with open cell facing down 18 inches, and then turn PHWHUXSULJKWDWWKDWGHSWKWR¿OOWKHFHOO5HPRYHPHWHUIURPZDWHUZLWKWKHVDPSOHIRUWHVWLQJ For Nitrate tests, the cell should be cleaned after each experiment with brush and distilled water. This is very IMPORTANT. If any zinc dust is adhering to the cell wall, it will affect the results. Finally, wash the sample three to four times before the measurement starts. HHWT-12 Tips For Best Accuracy
The following are some common messages that may be displayed, including error messages. If an error message other than those listed below is displayed, please contact Omega technical support in the USA at (800) 872-9436. HHWT-12 Meter Messages LCD Message HI LO LO ER
Description
In READ mode: test sample concentration is above WKHPHDVXUHPHQWUDQJH WHVWVSHFL¿F In READ mode: test sample concentration is below WKHPHDVXUHPHQWUDQJH WHVWVSHFL¿F In ZERO mode: sample absorbance (due to a cloudy or colored sample or a dirty cell) is too high to zero, the meter will read “LO”. Excessive stray light detected. Normally this does not occur, even when testing in sunlight. Low battery indication. Corrective Action Dilute and retest. Sample value is below measurement range. 'LOXWHVDPSOH¿OWHUVDPSOHRUFOHDQFHOO2QHRI these options should remedy the problem. Place the LIGHT BLOCKING CAP over the CELL for zeroing and for reading result. Moving WRDVKDGHGDUHDFDQDOVR¿[WKLVSUREOHP Replace the batteries. About The Built-In Cell The built-in CELLLVWUDQVSDUHQWSODVWLFDQGZKHQ¿OOHGWRWKHWRSFRQWDLQVP/7KHVWXUG\\CELL design will last for over 20,000 readings. Scratches on the CELL will not interfere or compromise the accuracy of WKHUHDGLQJVEHFDXVHRILWV¿[HGSRVLWLRQ)RUEHVWDFFXUDF\\ULQVHFHOOZLWKFOHDQZDWHULPPHGLDWHO\\DIWHU a test is completed. Do not use solvents, such as acetone, to clean the cell. When the CELL becomes stained or cloudy from repeated testing, or when the meter does not blank when you press the ZERO/ON button, the cell needs to be cleaned. Clean as follows )LOOFHOOZLWKFOHDQZDWHUDQGPRYHWKHCell cleaning brush up-and-down and back-and-forth along the walls of the cell. Afterwards, rinse the cell and the meter is ready for use again. Cleaning the cell regularly is especially recommended after you run a test that is using turbidity or precipitation chemistry for analysis (Calcium Hardness and Cyanuric Acid). 1. Unscrew the O-ring sealed battery cover counter-clockwise. Use proper sized pliers if necessary. Do not disturb the sealing O-ring. Batteries are not included. 2. Remove the used batteries and install 4 new AAA batteries following the diagram for correct polarity (see diagram). We recommend high quality AAA alkaline batteries be used. 4. Replace the battery cover. Be sure to tighten the cover securely. This is necessary for meter to be waterproof. 5. Dispose of the used batteries in accordance with your local regulations. 3UHVV=(5221EXWWRQWRFRQ¿UPWKHPHWHUWXUQVRQ The meter is now ready for operation. 7. Meter will not work if battery orientation is incorrect. To Install/Replace “AAA” Batteries: TOP VIEW
Strip Reagent Reorder Information * Results utilize the TR (Transmission) meter function and require the use of a conversion table. See respective test procedures for more information and tables. 7RWDO&KORULQH'3'7HVWUHTXLUHV)UHH&KORULQH'3' ++:7 WREHUXQ¿UVW 5 Consult manual M-5282 for complete instructions on Transmission Test procedures and required tables. N/A SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP N/A SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP SSP 178 PARAMETERNo. PART NO. # OF TESTS DETECTION RANGE CHEMISTRY 6WULS0LFUR 5HDJHQW6SHFLÀFDWLRQV)RUXVHZLWK++:7 Reference Standard Alkalinity, Total Bromine (DPD-1) Chlorine, Free (DPD-1) Chlorine, High Range Chlorine, Total (DPD-3)** Chlorine, Total (DPD-4) Copper (Cu +2) Hardness, Total (as CaCO3) Ozone (DPD-4) Permanganate (DPD-1) pH Nitrate (as NO Nitrite (as NO2 -2) Chloride (as NaCl) II* Chlorine Dioxide (DPD-1)* Chromium (VI)* Cyanuric Acid II* Glycine (used for Chlorine Dioxide) Hydrogen Peroxide LR* Hydrogen Peroxide MR* Hydrogen Peroxide HR* Iodine (DPD-1)* Total Iron, TPTZ (Fe+2/Fe+3)* LR Total Hardness (as CaCO3)* Manganese* Peracetic Acid (DPD-4)* Phosphate* Sulfate* 6XO¿GH DV+6 Turbidity* ++:7 HHWT-486641 HHWT-486636 HHWT-486637 HHWT-486672 HHWT-486638 ++:7 HHWT-486632 HHWT-486673 HHWT-486634 HHWT-486626 ++:7 ++:7 HHWT-486623 ++:7 HHWT-486633 HHWT-486614 ++:7 ++:7 HHWT-486616 HHWT-486648 HHWT-486676 HHWT-486627 ++:7 ++:7 ++:7 HHWT-486674 HHWT-486814 ++:7 HHWT-486646 None N/A N/A Alizarin Red S + Citrate DPD DPD KI + Buffer Kl DPD + Kl Biquinoline Phthalein Purple DPD + Kl DPD Phenol Red Zinc Reduction Chromotropic Acid Silver (ppt) DPD Diphenylcarbazide Melamine (ppt) Glycine DPD + PO4 + MoO4 + KI DPD + MoO4 + KI + acid DPD + KI DPD TPTZ + PP Phthalein Purple PAN + Cyanide DPD + KI Molybdate Method Barium (ppt) Nitroprusside Turbidity ,I\\RXUUHTXLUHGSURFHGXUHLVQRWOLVWHGLQWKLVPDQXDOSOHDVHVHHWKHEDFNSDJHIRURXUFRQWDFWLQIRUPDWLRQ NOTE: Because most of our products are test strips or use reagents that have little or no hazard in the quantity sold, MSDS sheets are not supplied with the test. To ensure optimal performance, store your test strips in a cool, dry place away from excess heat (below 100°F / 38°C), moisture, and oxidizers such as Chlorine and Bromine.
Free Chlorine results are compared using the HHWT-486637 (DPD-1) with the HHWT-12 Meter in Menu CL1 and Hach® DR890 Colorimeter in Program 9 and Program 12 using Hach® powder pillows. HHWT-486637 (DPD-1) Accuracy y = 0.9814x R = 0.99948 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.0 OMEGA Free Chlorine, ppm Hach Free Chlorine, ppm DPD Free Chlorine study, March 20, 2012 Hach vs ITS Linear (Hach vs OMEGA) DR890 HHWT-12 0.00 0 0.27 0.27 0.58 0.57 1.10 1.10 1.64 1.62 2.16 2.21 2.8 2.73 3.6 3.53 4.2 4.6 4.14 4.46 Meter Menu Range (PPM) Resolution HHWT-12 CL1 0 to 5.00 0.01 DR890 Program 9 0.00 to 2.20 0.01 Program 12 0.0 to 11.0 0.1 Hach® is a registered trademark of Danaher Corporation
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs. OMEGA is pleased to offer suggestions on the use of its various products. However , OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty , negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages. CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner. RETURN REQUESTS/INQUIRIES Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA ’S CUSTOMER SER VICE DEP ARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence. The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit. FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA: 1. Purchase Order number under which the product was PURCHASED, 2. Model and serial number of the product under warranty, and 3. Repair instructions and/or specific problems relative to the product. FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA: 1. Purchase Order number to cover the COST of the repair, 2. Model and serial number of the product, and 3. Repair instructions and/or specific problems relative to the product. OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC. © Copyright 2012 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.
Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at omega.comSM TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors Infrared Pyrometers PRESSURE, STRAIN AND FORCE Transducers & Strain Gages Load Cells & Pressure Gages Displacement Transducers Instrumentation & Accessories FLOW/LEVEL Rotameters, Gas Mass Flowmeters & Flow Computers Air Velocity Indicators Turbine/Paddlewheel Systems Totalizers & Batch Controllers pH/CONDUCTIVITY pH Electrodes, Testers & Accessories Benchtop/Laboratory Meters Controllers, Calibrators, Simulators & Pumps Industrial pH & Conductivity Equipment DATA ACQUISITION Data Acquisition & Engineering Software Communications-Based Acquisition Systems Plug-in Cards for Apple, IBM & Compatibles Data Logging Systems Recorders, Printers & Plotters HEATERS Heating Cable Cartridge & Strip Heaters Immersion & Band Heaters Flexible Heaters Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL Metering & Control Instrumentation Refractometers Pumps & Tubing Air, Soil & Water Monitors Industrial Water & Wastewater Treatment pH, Conductivity & Dissolved Oxygen Instruments