Vaisala HMP228 User Manual

Page 9

HMP228

M210282en-A

Operating Manual

INSTALLATION

2.1

Selecting the place of installation for the probe and the transmitter

Select a place which gives a true picture of the process. Oil should circulate
freely around the sensor; a rapid oil flow is recommended. Install the sensor
directly into the circulation system and not into the oil reservoir because of
deposition.

It is recommended that the sensor head is installed directly in the process
through the ball valve assembly. When the ball valve assembly is used, the
pipe does not have to be emptied or shut down for installation or removal of
the probe. Install the sensor head transversely against the direction of the
process flow.

NOTE

Avoid mounting the transmitter housing close to steam
sources or directly exposed to rain. To ensure an IP 65
class protection:

1. Always mount the transmitter housing with the cable

bushings pointing downwards.

2. Make sure that the connection cable has the right

thickness (

∅

7...10 mm) and that the cable bushing

is carefully tightened.

3. Pay always special attention to closing the

transmitter cover carefully and remember to tighten
all four screws.

NOTE

Take care not to damage the pipe of the probe. If the
pipe is damaged, the probe head is less tight and will
not go through the clasp nut. Make sure that the filter is
tightly fastened to protect the sensors.