8221

8221 BURKERT | Alldatasheet

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Technical content

Visit product website  DATA SHEET Type 8619  multiCELL - Multi-channel and multi-function transmitter/controller Type 8200  Armatures for analytical sensors Type BBS- 25  Clamp socket, clamps and seals according to DIN 32676 Standard | EU | en | 2024-03-26 | 17 Conductivity sensor for hygienic applications

• Perfect for demanding applications in the hygienic industry (CIP and SIP compatible) Wide measuring range thanks to various options available Support of the most important process connections ensures specific customer requests can be implemented Perfectly suited to the multi-purpose transmitter/controller Type 8619 The Type 8221 hygienic conductivity probes are used to determine electrical con - ductivity in a wide range of pure or concentrated liquids. Due to their hygienic and robust design, these conductivity probes are suitable for use in various application sectors, including the food & beverage, pharmaceutical, biotechnology and chem- ical industry. They are available in two technologies, with either 2 or 4 electrodes. Probes based on the 2-electrode principle are intended for use in pure liquids, particularly ultrapure water, as contamination affects the measurement. Probes based on the 4-electrode principle prevent polarisation phenomena and are not sensitive to contamination. The clever design guarantees an excellent linearity over the entire measurement range. All variants are fitted with an integrated temperature sensor (Pt1000) as standard. The probe has to be connected to the multiCELL transmitter/controller Type 8619. Product variants described in the data sheet may differ from the product presentation and description. Type description Can be combined with Type 8221 © Christian Bürkert GmbH & Co. KG, Subject to alteration

2 | 18Visit product website  Table of contents 1. General technical data 4 1.2. 4-electrode conductivity probe 1.3. 2-electrode conductivity probe 2. Product variants 6 Four active electrodes positioned laterally on the periphery of the armature Four active electrodes positioned at the base of the armature. 2.2. 2-electrode conductivity probe 3. Approvals and conformities 8 3.2. Conformity 3.3. Standards 3.4. Pressure Equipment Directive (PED) Device used on a pipe Device used on a vessel 3.5. Foods and beverages/Hygiene 4. Materials 9 5. Dimensions 10 With 1½" clamp process connection With 2" clamp process connection With 2" (DN 50/40) process connection adapted for GEA Tuchenhagen VARINLINE process connections With PG 13.5 process connection 5.2. 4-electrode conductivity probe with 8-pin M12 male connector With 1½" clamp process connection 5.3. 2-electrode conductivity probe with 5-pin M12 male connector With 1½" clamp process connection With screw-on process connection 6. Performance specifications 14 6.2. Pressure temperature diagram 7. Product installation 15 4-electrode conductivity probe with 1½" clamp or G 1¼" process connection 4-electrode conductivity probe with PG 13.5 process connection 2- or 4-electrode conductivity probe with clamp, G or NPT process connection and with M12 connector 8. Product operation 16 9. Networking and combination with other Bürkert products 17 10.

Ordering information

3 | 18Visit product website  10.3. Ordering chart 10.4. Ordering chart accessories

4 | 18Visit product website  1. General technical data 1.1. About the probe The probes are based on the 2 or 4 electrode principle. The technical data depends on the probe variant. The common technical data are described in this chapter and further information on the specifics can be found in chapter “2. Product variants” on page 6 1.2. 4-electrode conductivity probe Product properties Material Make sure the device materials are compatible with the fluid you are using. Further information can be found in chapter “4.1. Bürkert resistApp” on page 9 Depending on the probe variant. Further information on the materials can be found in chapter “2. Product variants” on page 6 Seal EPDM (conform to FDA 21CFR177.2600) Surface quality Ra < 0.4 μm (15 μin.), electro-polished (wetted metal surfaces) Dimensions Further information can be found in chapter “5. Dimensions” on page 10 Measuring element 4-electrode Temperature sensor Pt1000 Performance data Linearity 1.) (relative) ± 0.5…5 % Medium data Fluid temperature Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Fluid pressure Depending on the probe variant. Further information can be found in chapters “2. Product variants” on page 6 . and “6.2. Pressure temperature diagram” on page 14 Process/Pipe connection & communication Process connection Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Electrical connection Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Approvals and conformities Directives CE directive Further information on the CE Directive can be found in chapter “3.3. Standards” on page 8 Pressure equipment directive Complying with article 4, paragraph 1 of 2014/68/EU directive Further information on the pressure equipment directive can be found in chapter “3.4. Pressure Equipment Directive (PED)” on page 9 Foods and beverages/Hygiene • FDA declaration of conformity (only for variant with PEEK armature and EPDM seal) USP class VI declaration Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Materials Inspection certificate 3.1 Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Others On request: 2-point calibration certificate Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Environment and installation Ambient temperature Depending on the probe variant. Further information can be found in chapter “2. Product variants” on page 6 Degree of protection according to IEC/EN 60529 IP67, with connected device, inserted and screwed cable plug 1.) If only one cell constant is used over the entire range, uncertainties of ± 5 % may occur. If the measured calibration value is close to the measured conductivity value of the solution used, a measurement deviation of ± 0.5 % can be achieved.

5 | 18Visit product website  1.3. 2-electrode conductivity probe Product properties Material Electrode Stainless steel 316L/1.4404 Armature PEEK (conform to FDA 21CFR 177.2415) and Stainless steel 316L/1.4404 Seal EPDM (conform to FDA 21CFR 177.2600) Surface quality • Clamp process connection variant: Ra < 0.4 µm (15 μin.), electro-polished (wetted metal surfaces) Other process connection variants: Ra < 1.6 µm (60 μin.), (wetted metal surfaces) Dimensions Further information can be found in chapter “5. Dimensions” on page 10 Measuring element 2-electrode Temperature sensor Pt1000 Performance data Conductivity measurement Linearity 1.) (relative) ± 0.5…5 % Medium data Fluid temperature - 20…+ 150 °C (- 4…+ 302 °F) Fluid pressure PN 16 for - 20…+ 120 °C (- 4…+ 248 °F) and PN 10 at 150 °C (302 °F) Further information on the fluid pressure can be found in chapter “6.2. Pressure temperature diagram” on page 14 Process/Pipe connection & communication Process connection • 1½" clamp connection G 1" connection G ¾" connection NPT ¾" connection Electrical connection 5-pin M12 male connector Approvals and conformities Directives CE directive Further information on the CE Directive can be found in chapter “3.3. Standards” on page 8 Pressure equipment directive Complying with Article 4, Paragraph 1 of 2014/68/EU directive Further information on the pressure equipment directive can be found in chapter “3.4. Pressure Equipment Directive (PED)” on page 9 Foods and beverages/Hygiene • FDA declaration of conformity (only for variant with stainless steel and PEEK armature and EPDM seal) USP class VI declaration Materials Inspection certificate 3.1 Others On request: 2-point calibration certificate Environment and installation Ambient temperature • Operation: - 20…+ 150 Storage: - 10…+ Degree of protection according to IEC/EN 60529 IP67, with connected device, inserted and screwed M12 female cable plug 1.) If only one cell constant is used over the entire range, uncertainties of ± 5 % may occur. If the measured calibration value is close to the measured conductivity value of the solution used, a measurement deviation of ± 0.5 % can be achieved.

6 | 18Visit product website  2. Product variants 2.1. 4-electrode conductivity probe Probes based on the 4-electrode principle are available in two electrode architectures. Four active electrodes positioned laterally on the periphery of the armature Product properties Material Electrode in stainless steel 1.4435/316L, armature in PEEK (conform to FDA 21CFR 177.2415) and stainless steel 1.4435/316L Cell constant 1.) 0.147 cm- 1 Measuring range 0.1 µS/cm…500 mS/cm Medium data Fluid temperature - 20…+ 135 °C (- 4…+ 275 °F) Fluid pressure Max. 6 bar (87.06 PSI) Process/Pipe connection & communication Process connection • In short or long immersion depths: 1½" clamp connection G 1¼" process connection (on request) Electrical connection VarioPin male connector (VP 6.0) Approvals and conformities Foods and beverages/Hygiene ECR1935/2004 declaration Environment and installation Ambient temperature • Operation: - 20…+ 135 °C (- 4…+ 275 °F) Storage: + 4…+ °C (+ 39.2…+ 104 °F) 1.) Nominal cell constant. Every product is measured according to internal Bürkert specificatios. The individual cell constant is indicated in the calibration protocol supplied with the product and on the label of the product. The cell constant can be influenced by the installation situation.

7 | 18Visit product website  Four active electrodes positioned at the base of the armature. Two of the electrodes have a flat electrode architecture (measurement electrodes), while the other two electrodes are conical (excitation electrodes). Product properties Material Electrode in stainless steel 1.4435/316L 1.) and armature in PEEK (conform to FDA 21CFR 177.2415) and stainless steel 1.4435/316L Cell constant 2.) 0.36 cm- 1 Measuring range 1 µS/cm…300 mS/cm Medium data Fluid temperature - 20…+ 150 °C (- 4…+ 302 °F) Fluid pressure Max. 20 bar (290.2 PSI) for - 20…+ 135 °C (- 4…+ 275 °F) and max. 10 bar (145.1 PSI) at 150 °C (302 °F) Process/Pipe connection & communication Process connection • 2" clamp connection 2" (DN 50/40) connection adapted for GEA Tuchenhagen VARINLINE PG 13.5 connection Electrical connection VarioPin male connector (VP 6.0) Approvals and conformities Foods and beverages/Hygiene ECR1935/2004 declaration Environment and installation Ambient temperature • Operation: - 20…+ 150 °C (- 4…+ 302 °F) Storage: + 4…+ °C (+ 39.2…+ 104 °F) Product properties Material Electrode in stainless steel 316L/1.4404 and armature in PEEK (conform to FDA 21CFR 177.2415) and stainless steel 316L/1.4404 Cell constant 2.) 0.33 cm- 1 Measuring range 1 µS/cm…20 mS/cm Performance data Temperature measurement Response time (t90) 120 s Medium data Fluid temperature - 20…+ 150 °C (- 4…+ 302 °F) Fluid pressure PN 16 for - 20…+ 120 °C (- 4…+ 248 °F) and PN 10 at 150 °C (302 °F) Process/Pipe connection & communication Process connection 1½" clamp connection Electrical connection 8-pin M12 male connector Environment and installation Ambient temperature • Operation: - 20…+ 150 Storage: - 10…+ 1.) Other materials ara available on request. 2.) Nominal cell constant. Every product is measured according to internal Bürkert specificatios. The individual cell constant is indicated in the calibration protocol supplied with the product and on the label of the product. The cell constant can be influenced by the installation situation.

8 | 18Visit product website  2.2. 2-electrode conductivity probe Probes based on the 2-electrode principle are available in two electrode architectures: The hole is located 19 mm from the base of the armature. The electrode spacing is short and the inner electrode has a large cross-section area. Product properties Cell constant 1.) 0.01 cm- 1 Measuring range 0.05…20 µS/cm Performance data Temperature measurement Response time (t90) 60 s The hole is located 11 mm from the base of the armature. The electrode spacing is large and the inner electrode has a small cross-section area. Product properties Cell constant 1.) 0.1 cm- 1 Measuring range 1…200 µS/cm Performance data Temperature measurement Response time (t90) 100 s 1.) Nominal cell constant. Every product is measured according to internal Bürkert specificatios. The individual cell constant is indicated in the calibration protocol supplied with the product and on the label of the product. The cell constant can be influenced by the installation situation. 3. Approvals and conformities 3.1. General notes

• The approvals and conformities listed below must be stated when making enquiries. This is the only way to ensure that the pro duct complies with all required specifications. Not all available variants of the device can be supplied with the below mentioned approvals or conformities. 3.2. Conformity In accordance with the Declaration of Conformity, the product is compliant with the EU Directives. 3.3. Standards The applied standards which are used to demonstrate compliance with the EU Directives are listed in the EU-Type Examination Certificate and/or the EU Declaration of Conformity.

9 | 18Visit product website  3.4. Pressure Equipment Directive (PED) The device conforms to article 4, paragraph 1 of the Pressure Equipment Directive (PED) 2014/68/EU under the following conditions: Device used on a pipe Note: The data in the table is independent of the chemical compatibil ity of the material and the fluid. PS = maximum admissible pressure (in bar), DN = nominal diameter of the pipe Type of fluid Conditions Fluid group 1, article 4, paragraph 1.c.i DN ≤ 25 Fluid group 2, article 4, paragraph 1.c.i DN ≤ 32 or PS*DN ≤ 1000 Fluid group 1, article 4, paragraph 1.c.ii DN ≤ 25 or PS*DN ≤ 2000 Fluid group 2, article 4, paragraph 1.c.ii DN ≤ 200 or PS ≤ 10 or PS*DN ≤ 5000 Device used on a vessel Note: The data in the table is independent of the chemical compatibil ity of the material and the fluid. PS = maximum admissible pressure, V = vessel volume Type of fluid Conditions Fluid group 1, article 4, paragraph 1.c.i V > 1 L and PS*V ≤ 25 bar.L or PS ≤ 200 bar Fluid group 2, article 4, paragraph 1.c.i V > 1 L and PS*V ≤ 50 bar.L or PS ≤ 1000 bar Fluid group 1, article 4, paragraph 1.c.ii V > 1 L and PS*V ≤ 200 bar.L or PS ≤ 500 bar Fluid group 2, article 4, paragraph 1.c.ii PS > 10 bar and PS*V ≤ 10000 bar.L or PS ≤ 1000 bar 3.5. Foods and beverages/Hygiene Conformity Description FDA FDA – Code of Federal Regulations (valid for the variable code PL02, PL03) The devices with the housing made of PEEK materials and the seal made of EPDM materials are compliant in their composition with the Code of Federal Regulations published by the FDA (Food and Drug Administration, USA) according to the manufacturer‘s declaration. USP United States Pharmacopeial Convention (USP) (valid for the variable code PL04) The devices with the housing made of PEEK materials and the seal made of EPDM materials are biocompatible according to the manufacturer‘s declaration. EC Regulation 1935/2004 of the European Parliament and of the Council (valid for the variable code PL01, PL02) The devices with the housing made of PEEK materials and the seal made of EPDM materials are compliant with EC Regulation 1935/2004 according to the manufacturer‘s declaration. 4. Materials 4.1. Bürkert resistApp Bürkert resistApp – Chemical resistance chart You want to ensure the reliability and durability of the materials in your individual application case? Verify your combination of media and materials on our website or in our resistApp. Start chemical resistance check

10 | 18Visit product website  5. Dimensions 5.1. 4-electrode conductivity probe with VarioPin electrical connection With 1½" clamp process connection Note: Dimensions in mm, unless otherwise stated ∅ 13 ∅ 24 ∅ 50.5 Clamp 1½" 160 ∅ 16 VP6 ∅ 22 ∅ 13 ∅ 24 ∅ 50.5 Clamp 1½" 158 ∅ 16 VP6 ∅ 22 Short insertion depth Long insertion depth

11 | 18Visit product website  With 2" clamp process connection Note: Dimensions in mm, unless otherwise stated ∅ 16 ∅ 64 (Clamp 2") VP6 With 2" (DN 50/40) process connection adapted for GEA Tuchenhagen VARINLINE process connections Note: Dimensions in mm, unless otherwise stated ∅ 12.5 ∅ 68 ∅ 71 ∅ 84 ∅ 16 20 59 32.5 Connection DN50/40 VP6

12 | 18Visit product website  With PG 13.5 process connection Note: Dimensions in mm, unless otherwise stated ∅ 12 PG 13.5 174.5 120 AF 19 VP6 5.2. 4-electrode conductivity probe with 8-pin M12 male connector With 1½" clamp process connection Note: Dimensions in mm, unless otherwise stated 65.8 1.) Max. 118 2.) ∅ 35 ∅ 50.5 Clamp 1½" ∅ 17.5 1.) Length can be changed on request; minimum 3 mm 2.) Total length can be changed according to 1.)

13 | 18Visit product website  5.3. 2-electrode conductivity probe with 5-pin M12 male connector With 1½" clamp process connection Note: Dimensions in mm, unless otherwise stated 65 1.) Max. 118 2.) ∅ 33.5 ∅ 50.5 Clamp 1½" ∅ 16 ∅ 16 C = 0.01 C = 0.1 4 x ∅ 4 4 x ∅ 6 1.) Length can be changed on request; minimum 35 mm 2.) Total length can be changed according to 1.) With screw-on process connection Note: Dimensions in mm, unless otherwise stated ∅ 16 C = 0.1 118 ∅ 33.5 ∅ 16 C = 0.01 1619 ∅ 33.25 G 1" With G 1" connection 118 ∅ 33.5 ∅ 16 C = 0.01 1619 ∅ 26.44 G ¾" 118 ∅ 33.5 ∅ 16 C = 0.01 1619 ∅ 26.3 NPT ¾" AF 36 With G ¾" connection With NPT ¾" connection 4x ∅ 4 4x ∅ 6 ∅ 38 ∅ 38 ∅ 38 4x ∅ 4 4x ∅ 4 AF 36 AF 36

14 | 18Visit product website  6. Performance specifications 6.1. Linearity diagram Note: The following table only applies to conductivity probes based on the 4-electrode principle with VarioPin (VP 6.0) electrical connection. Measured value [µS/cm] Reference conductivity [µS/cm] 1.0E+06 1.0E+05 1.0E+04 1.0E+03 1.0E+02 1.0E+01 1.0E+00 1.0E-01 6.2. Pressure temperature diagram -20 0 +20 +40 +60 +80 +100 +120 +140 Pressure [bar] Fluid temperature °C Application range for conductivity probe 2 or 4 electrodes, 1½" clamp connection, G 1", G ¾" or NPT ¾" connection version with M12 connector 4 electrodes, G 1¼" and 1½" clamp connection (short/long) 4 electrodes, 2" clamp connection, 2" (DN50/40) adapted for GEA Tuchenhagen VARINLINE devices and PG 13.5 connection +160

15 | 18Visit product website  7. Product installation 7.1. Installation notes 4-electrode conductivity probe with 1½" clamp or G 1¼" process connection Note: The process connection must be sufficiently clean. Install the conductivity probe according to the instructions below. Installation example Description A: ø 60 mm min. A A The cell constant and the linearity of the probe can vary with the fitting situation. A symmetrical setup is recommended. Leave a minimum space of 60 mm minimum diameter. Partitions made of non-conductive material should preferably be used. A symmetrical setup is recommended in order to ensure a high linearity. To achieve high precision the cell constant should be calibrated in the final setup. Make sure that all the 4 electrodes are completely and continuously immersed in the measuring sample. 4-electrode conductivity probe with PG 13.5 process connection Note: To install the conductivity probe in a T-fitting or in a pipe, use a hygienic probe holder Type 8200. Observe a distance of 10 mm around the tip of the electrode. See data sheet Type 8200 for more information. Installation example The conductivity probe PG 13.5 is installed in a hygienic direct welded probe holder Type 8200 without adapter. The conductivity probe PG 13.5 is installed in a hygienic direct welded probe holder Type 8200 with adapter.

16 | 18Visit product website  2- or 4-electrode conductivity probe with clamp, G or NPT process connection and with M12 connector Note: Mount the probe in a 1½" T fitting made of stainless steel or alternatively in an orifice with a suitable thread, taking into account the entire length of the thread and the depth of the insertion of the prob, as shown below. The drawing shows the assembly with a process clamp connection. This also applies to a G or NPT process connection. Installation examples Description OutletInlet Probe with C = 0.01 Probe with C = 0.1 Inlet Outlet

• Align the probe hole as closely as possible with the centre of T fitting outlet. Make sure that the line is thoroughly flushed of its air during the filling 8. Product operation 8.1. Measuring principle Conductivity is defined by the property of a solution to conduct electrical current. The charge carriers are ions (e.g. dissolved salts or acids). In the simplest case the measurement cell consists of two metal electrodes which are set at a fixed distance apart and with a known specified surface. An AC voltage supplied from the connected transmitter/controller Type 8619 is applied to the electrodes. The measured current is a direct function of the quantity of ions contained in the solution, and with help of Ohm’s law the conductivity is calculated. The 4-electrode probe consists of two current and two voltage electrodes. Between the two current electrodes, an AC electric current flows, which is regulated by the transmitter/controller Type 8619. With the two voltage electrodes a resulting AC voltage drop is measured across the sample. The voltage drop depends on the conductivity of the sample. As a result of this measurement principle, 4 electrode sensors have a much broader linear measurement range, are insensitive to contamination and polarisation effects by adjusting the frequency of the AC current. There are countless types of conductivity probes whose measurement values vary by a great margin - depending on the electrode assembly. To compensate for the geometry of the conductivity cell a cell constant is used: Conductivity [S/cm] = Measurement [S] x Cell constant [1/cm]. The cell constant is either known or it is determined by means of conductivity standards, and has to be entered into the transmitter prior to measurement. mS/cm 0.02 0.05 0.1 0.2 0.5 100 200 500 100 200 500 0.5 0.2 0.1 0.01 0.5 0.2 0.1 0.01 0.05 0.02 0.005 0.002 0.05 0.02 0.005 0.002 µS/cm 2 000 MΩ.cm KΩ.cm Ultra-pure water Pure water Industrial water Effluent Concentrated solutions Resistivity scale Conductivity scale 300 4 electrodes with VarioPin (VP 6.0) connector 2 electrodes, C = 0.1 cm- 1 2 electrodes, C = 0.01 cm- 1 4 electrodes with M12 connector

17 | 18Visit product website  9. Networking and combination with other Bürkert products Example: All probes Probe with PG 13.5 connection Probe with 1½" or 2" clamp connection Type 8221 Type 8619  multiCELL Transmitter/ Controller Type 8200  Armatures for analytical probes Type BBS - 25  Clamp ferrules, clamps and gaskets 10. Ordering information 10.1. Bürkert eShop Bürkert eShop – Easy ordering and quick delivery You want to find your desired Bürkert product or spare part quickly and order directly? Our online shop is available for you 24/7. Sign up and enjoy all the benefits. Order online now 10.2. Bürkert product filter Bürkert product filter – Get quickly to the right product You want to select products comfortably based on your technical requirements? Use the Bürkert product filter and find suitable articles for your application quickly and easily. Try out our product filter

18 | 18Visit product website  10.3. Ordering chart Cell constant Measuring range Process connection Probe Approval and conformity Electrical connection Article no. FDA USP class VI ECR 1935/2004[cm- 1] [µS/cm] Conductivity probe 4-electrode 0.147 0.1…500 000 1½" clamp Short Yes Yes Yes VarioPin (VP 6.0) 562420 Long 564064 0.36 1…300 000 2" clamp – 559120 2" (DN 50/40) adapted for GEA Tuchenhagen VARINLINE 563269 PG 13.5 563186 0.33 1…20 000 1½" clamp No 8-pin M12 male connector 571162 Conductivity probe 2-electrode 0.01 0.05…20 1½" clamp – Yes Yes No 5-pin M12 male connector 568818 G 1" 569644 G ¾" 570452 NPT ¾" 570454 0.1 1…200 1½" clamp 569643 G 1" 569645 G ¾" 570453 NPT ¾" 570455 Further variants on request Process connection Others…e.g. G 1¼" 10.4. Ordering chart accessories Description Article no. EPDM seal for measuring device with G ¾" external threaded process connection 561955 EPDM seal for measuring device with 1½" clamp process connection 730277 FKM seal for measuring device with 1½" clamp process connection 730285 EPDM seal for measuring device with 2" clamp process connection 730289 FKM seal for measuring device with 2" clamp process connection 730299 M12 female connector with plastic threaded clamping ring, 5-pin, straight, to be wired 917116 M12 female connector with moulded cable (shielded), 5-pin, straight, cable length: 2 m 438680 M12 female connector with moulded cable (shielded), 5-pin, straight, cable length: 5 m 560365 M12 female connector with moulded cable (shielded), 5-pin, straight, cable length: 10 m 563108 M12 female connector with plastic threaded clamping ring, 8-pin, straight, to be wired 444799 8-pin M12 straight female connector moulded on cable (2 m, shielded) 444800 8-pin M12 straight female connector moulded on cable (10 m, shielded) 555675 Connection cable with VarioPin female connector (VP 6.0) and open strand ends with wire end sleeves, cable length: 3 m 554855 Connection cable with VarioPin female connector (VP 6.0) and open strand ends with wire end sleeves, cable length: 5 m 554856 Connection cable with VarioPin female connector (VP 6.0) and open strand ends with wire end sleeves, cable length: 10 m 554857 Buffer solution, 300 ml, conductivity standard: 5 µS/cm, ± % accuracy 440015 Buffer solution, 300 ml, conductivity standard: µS/cm, ± % accuracy 440016 Buffer solution, 300 ml, conductivity standard: 100 µS/cm, ± % accuracy 440017 Buffer solution, 300 ml, conductivity standard: 706 µS/cm, ± % accuracy 440018 Buffer solution, 300 ml, conductivity standard: 1413 µS/cm, ± % accuracy 440019 Buffer solution, 300 ml, conductivity standard: 100 mS/cm, ± % accuracy 440020