Safety Instructions; Application; Design And Operating Principle - WIKA 70 Betriebsanleitung

1. Safety instructions / ... / 3. Design and operating principle

1. Safety instructions

GB
Do not work on gauges with micro switch unless the power has been

isolated.
Serious injury and/or damage can occur if the appropriate regulations

are not observed.
Only appropriately qualified personnel should work on these instruments.


2. Application

Universally applicable safety temperature measuring instruments / temperature
regulator (with micro switch) 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.
Temperature measuring instruments with micro contact/s (temperature
regulator)
When the switch point is passed, the switch disc (cam disc), fitted to the
pointer shaft, triggers the micro switch.
Apart from the standard version with 1 or  adjustable contacts there are further
combinations such as:
1 or  non-adjustable micro switches

1 non-adjustable and 1 variable adjustable micro switch

The switch points of the non-adjustable micro switches are printed on the
product label.
4
The appropriate national safety regulations (e.g. VDE 0100)
must be observed when installing, commissioning and
operating these devices.
WIKA Operating instructions Expansion thermometers Model 70