WIKA TGT73 - Manual (Page 16)

GB
Capillary
Bend protector
3107922.01
Tube clip mounting
Lagging
14028755.02 08/2012 GB/D/F/E
16 WIKA operating instructions model TGT73
7. Mounting instructions for contact bulb
The contact bulb has been designed for mounting on pipes or tanks.
When mounting this thermometer version, it must be ensured that the
contact bulb is in contact with the measuring point over its complete
length. The basic requirements to ensure a perfect measurement
result is to retain good thermal contact between the skin mounted
contact bulb and the outside wall of the pipe or tank with minimal heat
loss to ambient from the skin mounted contact bulb and measuring
point.
3107876.01
7.1 Mounting to pipes
The geometry of the contact
bulb has been designed for
pipes with external diameters
between 20 and 160 mm. The
skin mounted contact bulb should
have direct metallic contact with
the measuring point and have firm
contact with the surface of the
pipe. Where temperatures under
200 °C are to be expected, a heat conducting paste can be used to
optimise the heat transmission between skin mounted contact bulb
and pipe. Lagging must be applied where the skin mounted contact
bulb has been mounted, in order to avoid error due to heat loss.
This lagging must have sufficient temperature resistance and is not
provided with the instrument.
7. Mounting instructions for contact bulb