WIKA TGT73 - Manual (Page 10)

GB
14028755.02 08/2012 GB/D/F/E
10 WIKA operating instructions model TGT73
Designation of terminal
connectors dependent on the
output signal variant
Terminal
Type
1
2
3
4
5
6
Variant I
4 ... 20 mA
GND
I+
reserved
reserved
reserved
reserved
Variant II
0 ... 10 V
GND
UB+
U
out
reserved
reserved
reserved
For further specifications see WIKA data sheet TV 17.10 and the
order documentation.
4. Design and function
4.1 Description
The gas-actuated thermometer consists of a stem, capillary, Bourdon
tube and transmitter in the casing. These parts are combined to form
a single unit. The entire measuring system is filled with an inert gas
under pressure.
Any change in temperature causes a change in internal pressure in
the stem, and thus a change in the shape of the pressure element.
This motion is converted, via a mechanical movement, into a
rotational motion. A magnet on the pointer shaft rotates proportionally
to the instrument pointer as a direct linear function of the process
temperature. The downstream electronics detect the rotational motion
of the magnet in the display range.
A magnetic-field dependent rotational sensor picks up this change on
the electronics side, contact-free, wear-free and without reaction on
the pressure element.
3. Specifications / 4. Design and function