6702-AAAB-0000

6819-01 ETC2 | Alldatasheet

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SWITCHING AND SENSING SOLUTIONS a Pressure & Vacuum Switches

1999 FOR FURTHER INFORMATION TEL: +44 (0)1284 701422 FAX: +44 (0)1284 753112 ISSUE 01

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Herga Electric Limited is an independent UK manufacturer of switching systems. In addition to pressure and vacuum switches, we offer other innovative switching solutions:- hergair Airswitching systems herga Footswitches hergalite Fibre Optics / Infra red safety products herga Hand controls Our expertise spans the automotive, medical, packaging, domestic appliance and spa industries. Herga is driven to respond rapidly to delight our customers. Herga seeks to develop its relations with customers to achieve their business goals. Global Presence Our distributor network covering the worlds major markets enables technical help and assistance to be just a phone call away. Continuous Improvement Herga’s approval to ISO 9002 ensures that we are fully in control of our quality. However, this is just the starting point for an aspiring World Class company. We encourage training and development and continuous improvements at individual, team and company level. How can we help you? This brochure provides a brief overview of our product range. If you require further information, please contact us at our e-mail address: herga.electric@dial.pipex.com Herga’s customers worldwide include BMW/Rover Electrolux Jacuzzi RS Components Siemens General Electric

Pressure & Vacuum Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale.

6702 High Pressure Switch

High pressure switch all plastic construction. Ranges 1.4-13.8 Bar (20-200 PSI). Two (2) Pole Electrical Switching. Page PV1 & 2

6773 Double Diaphragm Pressure Switch

Double diaphragm construction to meet double insulation requirements of EN 60335-2-60. Water presence detection. Page PV3 6761 and 6763 Low Air Pressure Vacuum Switches Printed circuit board mounted, pressure/vacuum switches. UL versions available. Page PV4 6741 and 6742 Medium Pressure Switches Constructed in Nylon 12 material (pressure range 0.1 Bar to 8.2 Bar). Single or double pole in 8 adjustable switch ranges. UL versions available. Page PV5 & 6 6731 and 6732 Low Pressure Switches Constructed in Nylon 12 material (pressure range (0.0037 Bar to 0.137 Bar). Single or double pole in 3 adjustable switch ranges. UL versions available. Page PV7 & 8

6753 Low Air Pressure/Vacuum Switches

Small versatile compact differential switch with low contact inertia for rapid switching (range 2.5 mbar to 40 mbar). Page PV9 & 10 6721 and 6722 Vacuum Switches Constructed in Nylon 12 material (vacuum range -0.0075 Bar to -0.670 Bar). Single or double pole in 5 adjustable switch ranges. UL versions available. Page PV11 & 12 Pressure Conversion Chart For more commonly used measurements, including flow, liquid, force and weight equivalents. Page PV13 Certification Markings Covers most worldwide authorities/certification marks. Page PV14 Fax Back Sheet For your fast quotation service. Page PV16 Page PV15 Accessories / Switch Housings Air and electrical connections are available for all pressure and vacuum switches. Please also refer to Airswitching section or contact herga for details.

6702 ~ High Pressure Switch As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 6702 1. Model Number 2. Operating Pressure A 20 - 50 PSI (1.40 - 3.45 Bar) Red Spring B 40 - 100 PSI (2.76 - 6.89 Bar) White Spring C 80 - 200 PSI (5.52 -13.79 Bar) Blue Spring 3. Additional Operating (Springs) A 20 - 50 PSI (1.40 - 3.45 Bar) B 40 - 100 PSI (2.76 - 6.89 Bar) C 80 - 200 PSI (5.52 - 13.79 Bar) D 20 - 50 PSI (1.40 - 3.45 Bar) & 40 - 100 PSI (2.76 - 6.89 Bar) E 40 - 100 PSI (2.76 - 6.89 Bar) & 80 - 200 PSI (5.52 - 13.79 Bar) F 80 - 200 PSI (5.52 - 13.79 Bar) & 20 - 50 PSI (1.40 - 3.45 Bar) G 20 - 50 PSI (1.40 - 3.45 Bar) & 40 - 100 PSI (2.76 - 6.89 Bar) & 80 - 200 PSI (5.52 - 13.79 Bar) Z No additional springs supplied 4. Electrical Microswitching Rating A 21A 250V ac Silver Change Over Contacts B 0.1A 250V ac Gold Change Over Contacts C 0.1A 24V ac/dc Gold Change Over Contacts 5. Packaging and Label Option A Herga individually packed in plain carton B Herga vacuum form tray (for quantities 10+) 0000 Benefits v High pressure switch, all plastic construction (glass loaded nylon) v Alternate diaphragm and connectors available for volume orders v Excellent repeatability v Switches have adjustable pressure and differential v Specific settings can be set for volume orders v IP65 enclosures class II double insulated

6702 ~ High Pressure Switch As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale.

6702 Pressure Switch

The industrial pressure switch is moulded entirely in plastic with the exception of the pressure connection and is water, oil and dust proof to IP65. The switches have excellent repeat accuracy, even over widely varying ambient conditions. The operating pressure is adjustable externally using the thumb screw on the top and the approximate pressure setting can be seen through a window in the cover. To discourage unauthorised tampering, the adjusting screw can be locked in position with an M1.5mm Allen screw. The microswitches have independent vernier adjustment and are normally set to operate within 2 PSI on rising pressure. Where two pressure levels are to be controlled, the switches can be adjusted separately so that one switch will operate at up to 80% of the level of the second. The switches can also be set to operate simultaneously on falling pressure instead of rising pressure. The pressure switch is of Class II construction with double insulation. For quantity orders, many special options are available, please enquire:- v Single or double pole switching set to specific pressure levels v Alternative connector sizes v Alternative diaphragms and metal chambers to resist particular fluids v Installation and setting instructions are supplied with each product Withstand pressure 500 PSI (34.5 Bar) Setting accuracy when set by herga ± 10% Temperature range -5˚C to +70˚C Diaphragm Fabric reinforced Nitrile Weight 300g Other Information Acetone Ammonia (Liquid) Amyl Alcohol to 20˚C Automotive Brake Fluid Beer Butane Carbon Dioxide (Dry) 3 Citric Acid 3 Copper Sulphate (Sol.) Compressed Air 3 Cutting Oil 3 Diesel Oil 3 Detergent Solution 3 Fuel Oil 3 Glycol 3 Hydraulic Oil 3 Hydrogen 3 Lubricating Oil 3 Milk Mineral Oil Natural Gas 3 Oxygen to 70˚C 3 Petrol 3 Plating Solution (Chrome) Salt Water Sewage Turpentine 3 Vinegar Water Suitability for use with different operating media Pressure Medium 6702 Silver Contact Microswitch Data Average Life Expectancy Mechanical 1.0 x 10 6 2.0 x 105 @ 10A 1.0 x 104 @ 21A Max. Electrical LoadElectrical Rating Electrical Voltage Res. Ind. (Pf 0.75 Motor) AC 250V 250V 125V 12V 24V 60V 110V 220V 21A 15A 0.5A 0.25A 21A 15A 0.5A 0.2A 0.1A 21A 21A 21A 1HP 2HP DC Gold Contact Microswitch Data Average Life Expectancy Mechanical 1.0 x 1.0 6 2.0 x 105 @ 10A 1.0 x 104 @ 21A Max. Electrical LoadElectrical Rating Electrical Voltage Res. Ind. (Pf 0.75 Motor) AC UL/CSA Only 250V 125V 0.1A 0.1A 0.05 ----- N/A ----- Switch Standards: EN 60730, EN 61058 and UL 508 Approvals Available: CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO, OVE, SEMCO, SET I, SEV, UL, VDE 3 = Recommended = Suitable with modifications Note:Dry Switching - if switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30V), consult herga or refer to gold contact in section 4 of the opposite page. Herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. Note:differentials are approximate

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 6773 ~ Double Diaphragm Pressure Switch 6773 1. Model Number 2. Pressure Range A 250mm H 2O to 760mm H2O Standard 3. Caps A Side Entry Std Spout Std Orientation 4.0mm Spout B Side Entry Std Spout Rotated 90˚Viewed From Cap 4.0mmØ Spout C Side Entry Std Spout Rotated 180˚Viewed From Cap 4.0mmØ Spout D Side Entry Std Spout Rotated 270˚Viewed From Cap 4.0mmØ Spout E Side Entry Long Spout 4.0mmØ Std Orientation F Side Entry Long Spout Rotated 90 ˚Viewed From Cap 4.0mmØ Spout G Side Entry Long Spout Rotated 180˚Viewed From Cap 4.0mmØ Spout H Back Entry Short Thread 4.0mmØ Spout. Not suitable for ‘O’ ring J Back Entry Long Thread 4.0mmØ Spout K Back Entry Long Thread 2.0mmØ Spout L Long Thread Spout Rotated @ 90 ˚4.0mmØ Spout 4. Bleed A No Bleed Cap J With Bleed Cap 5. Nut Specification A Black Moulded Nut B Black Moulded Nut and ‘O’ Ring (only available with options 3J, K & L above) 6. Authority A European Tag Configuration 7. Terminal Combinations A 3 Blade QC 6.3mm x 0.8mm B 2 Blade QC 6.3mm x 0.8mm Normally Open Contacts C 2 Blade QC 6.3mm x 0.9mm 90˚ Crank Normally Open Contacts 8. Microswitch Rating A 0.1A 125/250V ac Gold Contacts (not available with option 7c) B 10A 1/4 HP 125/250V ac C 21A 250V ac 1 HP 125V ac 2 HP 250V ac AA Benefits v Specified to EN 60335-2-60 double insulated for water detection v Various microswitch options v Gold contacts available v Other pressures available up to 10 PSI v Multiple cap and spout options available

6761 & 6763 ~ Low Air Pressure Vacuum Switches (slow make contacts) As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Benefits v A range of small switches designed for direct mounting onto printed circuit boards v UL versions available v Various spout orientations available v Double diaphragm versions available upon request v Available with base or side tube entry v Silver or gold contact options v Switches can be factory set within specified tolerances v 'O' ring seals available for dust and water tight applications, back entry versions only Printed Circuit Board Mounting Switches Model No 6761 (Vacuum) 6763 (Pressure) Pressure/Vacuum range Minimum 150mm (6 ins) Wg 150mm (6 ins) Wg Maximum 670 millibar (9.8) PSI 1.0 Bar (14.7) PSI Maximum Differential Approximately 0.06 ins WG Approximately 0.06 ins WG Pressure/Vacuum Range Adjustable variants Adjustable variants Body Withstand Pressure 2.7 Bar (40) PSI 2.7 Bar (40) PSI Air Bleed Version Available upon request Available upon request Flow Rate Litre / Min (with air bleed) 8 - 30cc/Min @ 31 ins WG 8 - 30cc/Min @ 31 ins WG Pressure Connection 4mm Ø spout for side and back entry 4mm Ø spout for side and back entry 2mm Ø spout for back entry only 2mm Ø spout for back entry only Lower spout ‘V’ vacuum Upper spout ‘P’ pressure Connecting Tube Reference 4mm spout = 2311-01 or 2311-08 4mm spout = 2311-01 or 2311-08 2mm spout = 2311-03 2mm spout = 2311-03 Temperature Range -10˚C to 85˚C (Flow Solder 220˚C for 5 Sec) -10˚C to 85˚C (Flow Solder 220˚C for 5 Sec) Electrical Data Switch Single Pole Normally Open Single Pole Normally Open Contact Rating Maximum 0.5A RES 250V ac (Silver contacts) 0.5A RES 250V ac (Silver Contacts) UL 50mA RES 250V ac 50mA RES 250V ac (Maximum ratings may not be achieved at low pressure settings) Dry Switching Maximum Recommended Current 10mA 24V dc (UL) 10mA 24V dc (UL) Body Glass filled polyester Glass filled polyester Diaphragm Silicone as standard Silicone as standard Contacts Silver or gold plated copper pins Silver or gold plated copper pins Mechanical Life 1 x 10 6 cycles 1 x 10 6 cycles Weight (grams) 8grms 8grms 6761/6763 Vacuum and Pressure Switch Range A miniature, compact low pressure switch designed for direct fitting by solder pins to printed circuit boards. Both vacuum and pressure ports are provided making the unit ideal for differential switching. Typical applications are indicators, emergency cut-out and alarms, filter and low pressure/vacuum monitoring. The switch is made to order for specific applications, the actual operating pressures or vacuum being set during production. However, final adjustment may be made after installation by the slotted screw in the base. The body construction allows the two ports to be set at any angle to each other. Non Std shown as 270˚

6741 / 6742 ~ Medium Pressure Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Benefits v Switches set to specific rising or falling pressures v UL recognised versions available v High performance repeatability v Single or double pole switching v Customised settings available upon request v Various connector options available Silver Contact Microswitch Data Average Life Expectancy Mechanical 1.0 x 10 6 2.0 x 105 @ 10A 1.0 x 104 @ 21A Max. Electrical LoadElectrical Rating Electrical Voltage Res. Ind. (Pf 0.75 Motor) AC 250V 250V 125V 12V 24V 60V 110V 220V 21A 15A 0.5A 0.25A 21A 15A 0.5A 0.1A 0.1A 21A 21A 21A 1HP 1HP DC Gold Contact Microswitch Data Average Life Expectancy Mechanical 1.0 x 10 6 2.0 x 106 @ 10A 1.0 x 104 @ 21A Max. Electrical Load Electrical Voltage Res. Ind. (Pf 0.75 Motor) AC UL/CSA Only 250V 125V 0.1A 0.1A 0.05 ----- N/A ----- Switch Standards: EN 60730, EN 61058 and UL 508 Approvals Available: CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO, OVE, SEMCO, SET I, SEV, UL, VDE NB Herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. Model No 6742-20/30/40/50/60 6742-70/80/90 Electrical Switch Data 2 Pole change over 2 Pole Change over Contact Rating 21 (8) A 250V ac 21 (8) A 250V ac Pressure Connection Brass 1/8" BSPT Brass 1/8" BSPT Setting Accuracy ± 10% as standard ± 10% as standard Withstand Pressure 25 PSI or x 2 150 PSI 10 Bar Temperature Range -5˚C to + 70˚C -5˚C to + 70˚C Body Material Nylon 12 Nylon 12 Nitrile fabric Diaphragm Neoprene reinforced fitted in brass pressure capsule Spring Spring steel Spring steel Weight 50gm 85gm P.S.I Bar 6742-20 1.5 - 3.5 0.10 - 0.24 See chart 1 6742-30 3.0 - 5.5 0.20 - 0.37 See chart 1 6742-40 5 - 10 0.34 - 0.68 See chart 1 6742-50 8 - 18 0.54 - 1.22 See chart 2 6742-60 16 - 30 1.08 - 2.04 See chart 2 6742-70 25 - 55 1.70 - 3.79 See chart 3 6742-80 45 - 75 3.1 - 5.17 See chart 3 6742-90 60 - 120 4.14 - 8.27 See chart 3 Model No Pressure Range Differential (Fixed) Special options are available for quantity orders v Diaphragms in silicon rubber, nitrile, EPDM v Switches with wide or close differentials v Springs in stainless steel v NPT connectors available Electrical Rating

6741 / 6742 ~ Medium Pressure Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Suitability for use with different operating media Pressure Medium Chemical Compatibility 6742/20/30/40 50 & 60 6742/70/80 & 90 Diaphragms Acetone Ammonia (Liquid) Amyl Alcohol to 20˚C Automotive Brake Fluid Beer Benzyl Alcohol Butane 33 Carbon Dioxide - Dry 33 Citric Acid 33 Copper Sulphate (Sol.) Compressed Air 33 Cutting Oil 3 Diesel Oil 3 Detergent Solution 3 Fuel Oil 3 Glycol 33 Hydraulic Oil 3 Hydrogen 33 Lubricating Oil 3 Milk Mineral Oil 3 Natural Gas 33 Nitric Acid (Dil.) Oxygen to 70˚C 33 Petrol 3 Plating Solution (Chrome) Salt Water Sewage 3 Sulphur Dioxide Turpentine 3 Vinegar Water 33 Key: 3 = Recommended = Suitable with modification = Not suitable 2.0 1.5 1.0 0.5 Bar PSI Chart 2 0.5 1.0 1.5 2.0 Bar 5 10 15 20 25 30 PSI Max Differential Min Differential FALLING PRESSURE 6472-60 6472-50 RISING PRESSURE 6472-90 Bar PSI 120 110 100 Chart 3 2 3 4 5 6 7 8 20 30 40 50 60 70 80 90 100 110 120 Max Differential FALLING PRESSURE 6472-70 RISING PRESSURE Min Differential 6472-80 PSI Bar 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Bar PSI Chart 1 2 4 6 8 10 PSI Max Differential Min Differential 6472-30 6472-40 6472-20 RISING PRESSURE Note:Differentials are approximate Alternative Pressure Connections 1/8” NPT Pressure Connector

6731 / 6732 ~ Low Pressure Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Benefits v These switches have been designed primarily for the OEM manufacturer who requires low cost and high reliability v UL recognised versions available v The switches have excellent repeat accuracy v Double pole switching available upon request v Wide choice of microswitch options including tab configurations Pressure Switches 6731-03 2 x 106 0.2 x 106 @ 1A Max Electrical LoadElectrical Rating Resistive 0.5A 0.25 0.5A 0.5A 0.2A 0.1A Inductive Average Life Expectancy AC DC Switch Standards: EN 60730, EN 61058 and UL 508 Approvals Available CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO, OVE, SEMCO, SET I, SEV, UL, VDE. Approved to BS 3955 part III Mechanical Electrical Voltage 125V 250V 12V 24V 60V 110V 220V Note:Dry Switching If switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30V), consult herga for special switches. NB - Herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. Inches Water mm Water 6731-03 1.5 - 7 40 - 180 See chart 1 6731-06 5 - 25 127 - 635 See chart 1 6731-10 20 - 55 510 - 1400 See chart 1 Model No Pressure Range Differential (Fixed) Special options are available for quantity orders v Switches set to specific operating pressure, rising or falling v Diaphragms in silicon rubber, nitrile, EPDM v Switches with wide or close differentials v Springs in stainless steel Model No Electrical Switch Contact Rating Pressure Connection Setting Accuracy Withstand Pressure Body Material Diaphragm Spring Weight Single Pole change over 3(1)A 250V ac Side entry spout 4mm O/D ± 10% as std

25 PSI

10(3)A 250V ac Side entry spout 4mm O/D ± 10% as std 21(8)A 250V ac Side entry spout 4mm O/D ± 10% as std 0.2 x 106 @ 6A 50K @ 10A Max Electrical Load Resistive 10A 10A 10A 0.5A 0.25A 10A 10A 10A 0.5A 0.2A 0.1A Inductive 0.5HP 0.5HP Motor (Pf0.75) 6731-10 1.0 x 106 0.2 x 106 @ 10A 10K @ 21A Max Electrical Load Resistive 21A 21A 21A 15A 0.5A 0.25A 15A 15A 21A 15A 0.5A 0.2A 0.1A Inductive 1HP 2HP Motor (Pf0.75)

6731 / 6732 ~ Low Pressure Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Suitability for use with different operating media Pressure Medium Chemical Compatibility 6731 Diaphragms Acetone Ammonia (Liquid) Amyl Alcohol to 20˚C Automotive Brake Fluid Beer Benzyl Alcohol Butane 3 Carbon Dioxide - Dry 3 Citric Acid 3 Copper Sulphate (Sol.) Compressed Air 3 Cutting Oil 3 Diesel Oil 3 Detergent Solution 3 Fuel Oil 3 Glycol 3 Hydraulic Oil 3 Hydrogen 3 Lubricating Oil 3 Milk Mineral Oil 3 Natural Gas 3 Nitric Acid (Dil.) Oxygen to 70˚C 3 Petrol 3 Plating Solution (Chrome) Salt Water Sewage 3 Sulphur Dioxide Turpentine 3 Vinegar Water 3 Key: 3 = Recommended = Suitable with modification = Not suitable 6731-03 6731-10 6731-06 FALLING PRESSURE Chart 1 mm Wg in WG in WG mm Wg Max DifferentialMin Differential RISING PRESSURE 1400 1200 1000 800 600 400 200 0 0 10 20 30 40 50 60 0 200 400 600 800 1000 1200 1400 Note:Differentials are approximate

6753 ~ Low Air Pressure / Vacuum Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. 6753 1. Model Number 2. Operation A Normally Open - Pressure B Normally Closed - Vacuum 3. Bleed Adjuster Options A Bleed A side only, Vacuum N/O to N/C, Pressure N/C to N/O B Bleed B side only, Vacuum N/O to N/C, Pressure N/C to N/O C Bleed both sides Vacuum / Pressure D No bleed variant either side Vacuum / Pressure 4. Bleed Setting A 100 - 300 cc/Min Factory Setting J No bleed setting 5. Pressure Setting A 2.25" WG ± 0.5" Std B 2" WG ± 0.5" E 6" WG ± 10% F 8" WG ± 10% G 10" WG ± 10% H 12" WG ± 10% J 14" WG ± 10% K 16" WG ± 0 - 10% 6. Packaging Options A Vacuum Form Tray (100 off volumes - ideal for OEM applications) B Poly Bag (individual) 000 Benefits v Sensitive versatile switch - ideal for long tube length

applications

v Normally open or normally closed contact configuration v Ideal for switching low power circuits v Bleed versions available for temperature compensation v Easily adjustable settings v Custom pressure, vacuum and bleed settings available upon request

6753 ~ Low Air Pressure / Vacuum Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Pressure/Vacuum range minimum 25mm (1 in) Wg maximum 400mm (16 ins) Wg Maximum Differential 400mm (16 ins) Wg 50mm (2.25 ins) Wg (Contacts Normally Open) Other settings available see note Maximum Differential Between 0.34 Bar (5 PSI) Pressure Connection Body Withstand Pressure 1.0 Bar (14.7 PSI) Air Bleed Version See choice options 3 & 4, other settings available, see note 3) Flow Rate Litre / Min Standard 100 - 300 cc/Min @ 5 PSI Connection Position Base see note 2) 4mm dia spouts Pressure Connection For reducing connectors, please refer to accessories page Connecting Tube Reference 2311-08 or 2311-01 Temperature Range -5˚C to 50˚C Electrical Data Switch Single pole, N/Open / N/Closed Dry Switching Minimum Current 5mA 4V dc Body Glass filled nylon 12 Diaphragm Neoprene Contacts Gold plated silver mounted on phosphor-bronze blades Contact Resistance 0.05 Ohms Mechanical Life 1 x 10 6 cycles Weight (grams) 10grms Technical Data Pressure Standard Factory Setting

6753 Pressure Switch Range

For very sensitive pressure, vacuum and differential pressure switching. The 6753 range of switches provide a high specification in a small, versatile body shell. Great care has been taken in the switch unit design, keeping the moving mass and therefore inertia to a minimum. This means that it can operate at a high cycle rate with low pressure, vacuum or pressure differential. This design feature can be used when measuring pressure pulses such as on component counting applications and used with herga Safe Edges. The switch will operate very rapidly keeping the switch delay to a minimum. 1) For good repeatable switching, the contacts are gold plated on solid silver. The electrical rating of the switch is dependent on the contact pressure. This pressure is dependent on the air pressure. Thus, for very sensitive setting the permissible switching current will be lower than normal. 2) The standard switch can be adjusted to give normally closed or normally open contacts depending on the application. For operation on pressure with normally closed contacts, connect to air connection ‘A’ and screw in sensitivity adjusting screw ‘S’ until contacts are normally closed. For operation on pressure with normally open contacts, connect to air connection ‘B’ and set with contacts normally open. 3) A separate version, (see bleed options), is provided with adjustable air bleeds on both sides of the diaphragm. These air bleeds are adjusted to a level which is suitable for most applications involving safe edges or elbows, and prevent pressure or vacuum building up inside when the ambient temperature or atmospheric pressure changes. Contact Rating Maximum 0.5A RES 250V ac (Maximum ratings may not be achieved at low pressure settings)

6721 / 6722 ~ Vacuum Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Benefits v These switches have been designed primarily for the OEM manufacturer who requires low cost and high reliability v UL recognised versions available v The switches have excellent repeat accuracy v Double pole switching available upon request v Wide choice of microswitch options available including tab configurations Pressure Switches 6731-03 2 x 106 0.2 x 106 @ 1A Max Electrical LoadElectrical Rating Resistive 0.5A 0.25A 0.5A 0.5A 0.2A 0.1A Inductive Average Life Expectancy AC DC Switch Standards: EN 60730, EN 61058 and UL 508 Approvals Available CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO, OVE, SEMCO, SET I, SEV, UL, VDE. Approved to BS 3955 part III Mechanical Electrical Voltage 125V 250V 12V 24V 60V 110V 220V Note: Dry Switching If switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30V), consult herga for special switches. NB - Herga do not accept liability for any vacuum operated device used outside the pressure range specified by the company. Inches Water mm Water 6721-03 3 - 8 75 - 200 See chart 1 6721-06 7 - 15 180 - 380 See chart 1 6721-20 13 - 32 330 - 810 See chart 1 6721-30 28 - 80 710 - 2030 See chart 2 6721-40 75 - 270 1900 - 6860 See chart 2 Model No Vacuum Range Differential (Fixed) Special options are available for quantity orders v Switches set to specific operating vacuum, rising or falling v Diaphragms in silicon rubber, nitrile, EPDM v Switches with wide or close differentials v Springs in stainless steel Model No Electrical Switch Data Contact Rating Vacuum Connection Setting Accuracy Temperature Range Body Material Diaphragm Spring (in Vacuum Cavity) Single Pole change over 3(1)A 250V ac Side entry spout 4mm O/D ± 10% std -5˚C to + 70˚C Nylon 12 Neoprene Spring steel Single Pole change over 10(3)A 250V ac Side entry spout 4mm O/D ± 10% std -5˚C to + 70˚C Nylon 12 Neoprene Spring steel Single Pole change over 21(8)A 250V ac Side entry spout 4mm O/D ± 10% std -5˚C to + 70˚C Nylon 12 Neoprene Spring steel 6721-03 6721-06 6721-20/30/40 6731-06 2 x 106 0.2 x 106 @ 6A 50K @ 10A Max Electrical Load Resistive 10A 10A 10A 0.5A 0.25A 10A 10A 10A 0.5A 0.2A 0.1A Inductive 0.5HP 0.5HP Motor (Pf0.75) 6731-10 1.0 x 106 0.2 x 106 @ 10A 10K @ 21A Max Electrical Load Resistive 21A 21A 21A 15A 0.5A 0.25A 15A 15A 21A 15A 0.5A 0.2A 0.1A Inductive 1HP 2HP Motor (Pf0.75) 1) 1) 1) Note:The spring is fitted in the vacuum cavity in contact with the media

6721 / 6722 ~ Vacuum Switches As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Suitability for use with different operating media Vacuum Medium Chemical Compatibility 6721 Diaphragms Acetone Ammonia (Liquid) Amyl Alcohol to 20˚C Automotive Brake Fluid Beer Benzyl Alcohol Butane 3 Carbon Dioxide - Dry 3 Citric Acid 3 Copper Sulphate (Sol.) Compressed Air 3 Cutting Oil 3 Diesel Oil 3 Detergent Solution 3 Fuel Oil 3 Glycol 3 Hydraulic Oil 3 Hydrogen 3 Lubricating Oil 3 Milk Mineral Oil 3 Natural Gas 3 Nitric Acid (Dil.) Oxygen to 70˚C 3 Petrol 3 Plating Solution (Chrome) Salt Water Sewage 3 Sulphur Dioxide Turpentine 3 Vinegar Water 3 6721-30 REDUCING VACUUM 6721-20 REDUCING VACUUM 6721-06 6721-03 Max Differential Min Differential INCREASING VACUUM Chart 1 -10 -20 -30 -40 -50 mm Hg In WG In WG -30 -25 -20 -15 -10 -5 0 -50 -40 -30 -20 -10 0mm Hg Max Differential Min Differential INCREASING VACUUM Chart 2 -50 -100 -150 -200 -250 -300 -350 -400 -450 -500 mm Hg In WG -25 -50 -75 -100 -125 -150 -175 -200 -225 -250 -275 In WG -225 -200 -175 -150 -125 -100 -75 -80 -25 -10 -400 -350 -300 -250 -200 -150 -100 -50mm Hg 6721-40 Key: 3 = Recommended = Suitable with modification = Not suitable Note:Differentials are approximate Alternative Vacuum Connections Back entry1/8” BSPT and NPT Connectors

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. P .S.I in/H 20 in/Hg mm/H 20 mm/Hg kg/cm 2 bar mbar Pa kPa P .S.I in/H 20 in/Hg mm/H 20 mm/Hg kg/cm 2 bar mbar Pa kPa Pressure Conversions Lbf/ln2 = Pounds force per square inch (psi) 1 psi = 27.6804 in/H2O 1 psi = 2.03602 in/Hg 1 psi = 68.9476 mbar 1 psi = 703.082 mm/H 1 psi = 0.0689 bar 1 in/H 2O = 25.4 mm/H2O 1 in/H2O = 1.86832 mm/Hg 1 in/H2O = 2.49089 Flow dm 3/s = Cubic decimetres per second ft3/Min = Cubic feet per minute 1/Min = Litres per minute 1dm 3/s = 2.119 ft3/Min 1dm 3/s = 60 Litres/Min 1Lt/Min = 0.0353 ft3/Min Liquid MI = Millilitre Fl oz = Fluid Ounce 1MI = 0.0352 Fl/oz 1 Litre = 0.21998 UK Gallon Force N = Newton Lbf = Pounds force Kgf = Kilogram force 1 N = 0.225Lbf

1 N = 0102Kgf

Kg = Kilogram Lb = Pound 1Kg = 2.2045Lb

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Japan MITI Netherlands KEMA New Zealand SECV SECQ SECWA EANSW ETSA HECT SANZ Norway NEMKO Republic of South Africa SABS Sweden SEMKO Switzerland SEV United Kingdom ASTA BSI BEAB United States UL Country Agency Mark Country Agency Mark CEBEC D FI EMA EURK B S BEAB or Australia SAA Austria OVE Belgium CEBEC Canada CSA Denmark DEMKO Europe MANY Finland FEI France UTE Germany VDE India ISI Ireland IIRS Italy IMQ

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Accessories: Switch Housings Part Number: 6819-00 Variants The most economical and compact housing, produced especially for hergair switches. Double insulated sealed enclosure is moulded in two tone black and white ABS as standard. The lid has an integral rubber sealing gasket and captive screws. Mounting holes and lid fixing screws are outside the seal, thus preventing the ingress of moisture and making the box waterproof to IP65. The standard 6819-00 housing is supplied with a cable gland for cable diameter 5mm to 7mm and a type 6418-00 air tube connector is fitted. The housing is suitable for all airswitches except model 6806. Note: Herga can offer many other variants of electrical housings in size and colour up to IP67. We also manufacture world-wide (plug in) switch housings with or without cordsets in conjunction with our airswitching systems. Please contact us with your specific requirements Part Number: 6816-00 Variants Diecast aluminium housing for airswitch types except 6806 models. Finished in blue stove enamel. Ideal for use where electrical screening is required. Other colour variants are available upon request as are specified fixing positions to suit your requirements. Where a number of airswitches are to be fitted in one box, herga can supply a variety of special boxes complete with multi-way air connectors and electrical connections as required. Part Number: 6819-01 Blue flexible PVC protective boot for air and pressure switch types 6721, 6731, 6741, 6861, 6863 and 6869. Covers all electrical connections and grips round outside of switch body. Can be used with cable 5mm to 9mm diameter. We recommend a cable restraint is used in connection with this part. Benefits v IP40 and IP67 Housings with rear fixing positions v Variations of air or electrical connections v Unlimited options available - contact herga with your requirements v Back entry versions for pressure switch connections v Available for all herga switching systems v Custom designed labels and housing colours available for volume OEM requirements

As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale. Rapid Response Form (Photostat and fax back) It is our goal to give you a response within 24 hours. By completing this form it will help us to help you! Thank you. CUSTOMER CONTACT NAME TEL: FAX: HERGA TO SET WE WILL SET ON RISING ON FALLING CONTACT CONFIGURATION: SINGLE POLE DOUBLE POLE GOLD CONTACT MECHANICAL: MOUNTING PREFERENCE 1/8” BSPT BRASS 1/8” BSPT STAINLESS SIDE SPOUT CENTRE SPOUT