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
herga
hergalite
herga
Airswitching systems
Footswitches
Fibre Optics / Infra red safety products
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
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.
Pressure & Vacuum Switches
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.
Range from (0.015 Bar - 1.0 Bar Pressure) (-0.015 Bar - 0.670 Bar Vacuum).
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
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.
Page PV15
Fax Back Sheet
For your fast quotation service.
Page PV16
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.
6702 ~ High Pressure Switch
Benefits
y
High pressure switch, all plastic construction (glass
loaded nylon)
y
Alternate diaphragm and connectors available for
volume orders
y
Excellent repeatability
y
Switches have adjustable pressure and differential
y
Specific settings can be set for volume orders
y
IP65 enclosures class II double insulated
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
E 40 - 100 PSI (2.76 - 6.89 Bar) & 80 - 200 PSI
F 80 - 200 PSI (5.52 - 13.79 Bar) & 20 - 50 PSI
G 20 - 50 PSI (1.40 - 3.45 Bar) & 40 - 100 PSI
& 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+)
0
0
0
0
(2.76 - 6.89 Bar)
(5.52 - 13.79 Bar)
(1.40 - 3.45 Bar)
(2.76 - 6.89 Bar)
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.
6702 ~ High Pressure Switch
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:-
y
Single or double pole switching set to specific pressure levels
y
Alternative connector sizes
y
Alternative diaphragms and metal chambers to resist particular fluids
y
Installation and setting instructions are supplied with each product
Note:
differentials are approximate
Suitability for use with different operating media
Pressure Medium
500 PSI (34.5 Bar)
± 10%
-5˚C to +70˚C
Fabric reinforced Nitrile
300g
Acetone
Ammonia (Liquid)
Amyl Alcohol to 20˚C
Automotive Brake Fluid
Beer
Butane
Carbon Dioxide (Dry)
Citric Acid
Copper Sulphate (Sol.)
Compressed Air
Cutting Oil
Diesel Oil
Detergent Solution
Fuel Oil
Glycol
Hydraulic Oil
Hydrogen
Lubricating Oil
Milk
Mineral Oil
Natural Gas
Oxygen to 70˚C
Petrol
Plating Solution (Chrome)
Salt Water
Sewage
Turpentine
Vinegar
Water
= Recommended
N/A
-----
Other Information
Withstand pressure
Setting accuracy when set by herga
Temperature range
Diaphragm
Weight
Silver Contact Microswitch Data
Average Life
Expectancy
Mechanical
Electrical
1.0 x 10
6
6702
2.0 x 10
5
@ 10A 1.0 x 10
4
@ 21A
Max. Electrical Load
Electrical Rating
Voltage
250V
AC
250V
125V
6V
12V
DC
24V
60V
110V
220V
Gold Contact Microswitch Data
Average Life
Expectancy
Mechanical
Electrical
Res.
21A
21A
21A
21A
15A
8A
1A
0.5A
0.25A
Ind.
8A
(Pf 0.75 Motor)
1HP
2HP
21A
15A
7A
0.5A
0.2A
0.1A
1.0 x 1.0
6
2.0 x 10 @ 10A 1.0 x 10 @ 21A
5
4
Electrical Rating
Voltage
AC
UL/CSA Only
Switch Standards:
Approvals Available:
250V
125V
Res.
0.1A
0.1A
Max. Electrical Load
Ind.
0.05
-----
(Pf 0.75 Motor)
= 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.
EN 60730, EN 61058 and UL 508
CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO,
OVE, SEMCO, SET I, SEV, UL, VDE
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.
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