WIKA SW15 - Manual (Page 4)

GB
1. Safety instructions / 2. Application / 3. Design, operating principle
11433116 03/
009 GB/D
WIKA Operating Instructions Safety Temperature Alerter Model SW15 4
1. Safety instructions
The appropriate national safety regulations (e.g. VDE 0100) must
be observed when installing, commissioning and operating
these devices.
Serious injuries and/or damage can occur should the appropriate
regulations not be observed.
Only appropriately qualified personnel should carry out the connection
work.
Any connection work may only be carried out once the equipment has
been isolated.
2. Application
Universally applicable safety temperature alerter for gaseous, liquid and highly-
viscous process media.
3. Design and operating principle
The fluid-filled, closed measuring system consists of a temperature sensor, a
measuring capillary and a bourdon tube. Heating the temperature sensor leads
to a volume change in the closed system and thus a change in the pressure.
This is transferred through a measuring capillary to the bourdon tube and,
through the angular motion of the pointer shaft, to the dial on the display.
When the switch point is passed, the switch disc (cam disc), fitted to the
pointer shaft, triggers the micro switch.
The fixed switching point is indicated by an additional pointer and is written on
the instrument label. The devices are equipped with capillary-break monitoring
and switch if the pressure decreases.
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