Elgas DATCOM, Operating Instructions Manual

Page: 59 / 228

5
Installation and Commissioning
57
The weld-on fitting must be welded in such a way that the thermowell is in the vertical
position, or inclined under 45° angle from the vertical axis with the cavity up (Fig. 16). Into the
weld-on fitting, a thermowell of the appropriate length for the used pipe diameter is screwed
over a copper gasket (see Table 2). The metal shank of the temperature transducer is
inserted thoroughly into the thermowell and secured by a locknut. The maximum axial load of
the temperature transducer cable is 50N.
Before inserting the sensor shank into the thermowell, it is recommended that the space
around the shank inside the thermowell is filled with silicone oil or that the shank is lubricated
with silicone grease for better heat transfer to the temperature sensor.
DN (mm) L – Thermowell
(mm)
Weld-on
fitting
40 55 inclined
50 55 straight
80 100 inclined
100 100 straight
150 160 inclined
>200 160 straight
Table 2 Weld-on fittings and thermowells appropriate for the pipe diameters
Fig. 16 Mounting the temperature sensor on the pipe
1 Temperature transducer
2 Locknut
3
Thermowell
4 Straight weld-on fitting
Fig. 17 Mounting the temperature sensor using a straight weld-on fitting