- Make sure the sensor is connected to the process line.
- Identify the sensor by the serial number (a).
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Check flow direction.
If the fitting has a fixed flange, the bolt holes should allow proper flow alignment of the probe. If this is not the case, remove the two fixing bolts (see PR-21-S part list sensor item 2.2). The sensor flange (b) can then be freely rotated.
Save the bolts, as they are useful at dismounting or if the sensor needs to be sent for service fixed flange is recommended.
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If there is a strong cooling effect that might cause prism coating, make sure that the
sensor flange is heat-insulated.
For more information, see Prism coating.
If the process medium is hot and sticky, heat the probe by using hot water before mounting. A cool prism tends to get rapidly coated.