Mechanical installation
Installation guide 762 VITO interfaces & VITO probes Page 7
Notes:
We do not recommend using liquid filled thermowells in tanks with heated products.
Due to the heating at the lower end, the liquid may circulate in the well which results
in a temperature mismatch.
We do not recommend using liquid filled thermowells on floating roof tanks. Due to
ambient temperature influence at the higher end, the liquid may circulate in the well
which results in a temperature mismatch.
Figure 1 Vent opening and expansion pipe
When the VITO probe is installed in a thermowell, the weight of the probe – combined with
the mechanically limited movement of the probe, is sufficient to warrant proper operation.
Caution
Water ingression must be prevented in thermowell.
When freezing, water becomes ice, which can damage
764/767/361/MRT temperature probe.
Refer to figure 2.
Remove optional lower IP adapter (7), nuts
(3 pc.), instrument label(s) and lock
washers (2 pc.) from the adjusting pipe (1);
Screw the flange (2) with G ½ threaded
hole on the adjusting pipe.
Note:
Take care not to damage the flying
leads when shifting the flange (2)
over the flying leads;
Position the gasket on the thermowell
nozzle;
Slowly unroll the temperature probe
while feeding it into the thermowell;
As soon as probe’s end touches the
bottom end of the thermowell,
adjust the flange (2) to the correct Figure 2 Installation of probe
position on the adjusting pipe (1).
Note:
Use a suitable pipe sealant on the adjusting pipe for sealing the threaded
part of the flange;
Secure the flange (2) on the thermowell flange;
While using liquid filled thermowells take
care that the liquid can expand when heated,
without creating an over pressure in the
thermowell.
It is recommended to use a vent opening
or an expansion pipe under the flange
(refer to figure 1), or any other suitable
method to prevent excessive pressures.
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