IM-P381-01
CH Issue 5
5
Correct installation
Incorrect installation
Fig. 1
These product are designed and constructed to withstand the force encountered in
normal use. Use of these products for any purpose other than as temperature controllers
could cause injury or fatality to personnel.
WARNING:
The sensor must not be subjected to mercury or ammonium salts.
Check that the control system supplied is of the temperature range required. It is important
that the whole of the temperature sensing area of the sensor is fully immersed in the fluid
being controlled, see Figure 1.
The sensors can be held in a screwed nipple by means of a compression ring. Screw the
nipple into the boss provided on the plant, thread the union nut and compression ring over
the sensor. Insert the sensor fully into the nipple and tighten up the nut and compression ring.
Do not overtighten.
Where the sensors are used in conjunction with a pocket, either to allow easy withdrawal or
as a protection against corrosion, the separate screwed nipple is dispensed with and the
union nut and compression ring attached directly to the top of the pocket. Therefore insert
the pocket in place of the screwed nipple.
When using a special long pocket with the SA122 or SA123 sensor, the screwed nipple,
compression ring and nut are dispensed with and a rubber sealing bung provided, which is
fitted over the capillary and slid into place to secure the sensor into the pocket. Screw the
pocket into place, then feed the sensor bulb to the bottom of the pocket, using the rubber
bung to seal the top.
When using a pocket it is advisable to fill the gap between the pocket and the sensor with
a heat conducting medium such as oil, but when using a special long pocket in conjuction
with the SA122 or SA123 sensors it should not be filled above the top of the sensor.
The adjustment mechanism should not be subjected to an ambient temperature above
50
°
C (122
°
F) or below -35
°
C (-31
°
F). The capillary tube between the sensor and the valve must
be run and supported in such a way that it will not become damaged. Avoid all sharp bends.
See Sections 5 and 6 'Display adjustment' and 'Commissioning'.
3. Installation
