WIKA SB15 - Manual (Page 4)

GB
1. Safety instructions / 2. Application / 3. Design, operating principle
11433094 03/
009 GB/D
WIKA Operating Instructions Safety Temperature Limiter Model SB15 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 limiter for water, oil and gas.
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 action of the micro switch and latches
the current switch status.
When reaching the switch point and in case of capillary-break a switch disc
(cam disc) on the pointer shaft releases the switching operation at microswitch
and unlatch the active switching status. With fixed switching points, the
switching point is indicated by an additional pointer and is written on the
instrument label.
Unlatching and resetting the working status:
The temperature limiter is unlatched by removing the plug on the window using
a screwdriver and turning the pointer shaft in an anti-clockwise direction.
(Only possible if there is no available capillary-break.)
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