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6
Installation/Commissioning
DANGER
Only install or uninstall the switch when deenergized (electrically and hydraulically/pneumatically).
Pressure connection and electrical connection must be carried out by trained or instructed
personnel according to state-of-the-art standards.
The switch must only be installed in systems where the maximum operation pressure P
exceeded (see the name plate).
WARNING
Pressure peaks and pressure shocks exceeding the maximum operating pressure are
inadmissible.
The maximum operating pressure is the upper final value of the adjustable range or, if specified,
the pressure indicated as maximum operating pressure (see Fig. 9 or the nameplate). Exceeding
the max. operating pressure affects the performance and the life span of the product and may
damage it.
Pressure switches must be mounted vibrationless.
WARNING
Check the switch regularly for functioning.
If the switch does not work properly, stop operation immediately!
IMPORTANT
The standard G1/4" female thread can be mounted directly on the pipe connection. The mounting
with a screw-wrench (SW30 (width across flats 1.18")( only on the thread block (see Fig. 8).
Torque: max. 30 Nm (22 ft lb(f))
IMPORTANT
All pressure switches are tested for proper functioning before they leave the factory. The factory
proof pressures are stated on the type plate.
Contact Protection
The micro switches used are normally suitable for both direct and alternating current operation.
Inductive, capacitive and lamp loads may, however, considerably reduce the life expectancy of a
micro switch and, under extreme circumstances, even damage the contacts.
Depending on the application spark suppression and current limiting is recommended (see figures 1
to 4).
4
MS
R1
C cable
is not
max
Fig. 1: Protection in case of capacitive loads
R1: Protection against starting current
rushes R2,R3: Protection against high
discharge currents
MS
U
=
Fig. 3: Protection in case of continuous
current and inductive load by recovery
diode
Set point adjustment
IMPORTANT
Factory-Provided: pressure (temperature) switch point setting
We confirm for pressure (temperature) switches that have been factory set the setting will be
detailed on the label name plate.
Warranty is not applicable for any changes that may occur due to transportation or installation.
For critical applications we recommend the setting is checked and re-set if cecessary after
installation and wirding of the pressure (temperature) switch.
In pressure switches, a displacement of the pressure sensing element (piston) occurs with a
change in pressure. Following the displacement of the pressure sensing element operates a
microswitch.
Upon delivery of the product, the set points are likely to be found in the middle of the adjustable
range. On request, fix set points may be adjusted by our factory. In this event, the point will be
indicated on the type plate or any separate plate, i = increasing, d = decreasing.
MS
Load
R3
R2
Fig. 2: Lamp load provided with resistance in
parallel or series connection to switch
of condensators
MS
U
Diode
Load
Fig. 4:
Protection in case of alternating
current and inductive load by RC-link
MS
R
R
c
R
Load
5
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