Vaisala HMP228 - Manual (Page 19)

HMP228
M210282en-A Operating Manual
13
• connect the wires into the screw terminals and fasten a cable tie
around the wires
Use connectors instead of traditional cabling. See Appendix 8 for connector
types available and for detailed instructions.
transmitter housing
cable tie
gland
brass disks
rubber ring
nut
NOTE
When the cable is grounded as explained, the metallic
parts of the sensor head, the screen of its cable, the
transmitter housing and the screen of the signal cable to
external system are all connected to each other. After
this the whole system can be grounded from one point
only. If the grounding is made via several points (sensor
head, transmitter housing, signal cable), make sure that
the different groundings are made to the same
grounding potential. Otherwise harmful grounding
currents may be generated. If you do the grounding via
the transmitter housing, use one serrated lock washer
between a mounting screw and the housing; the lock
washer breaks the paint on the housing.
When mains power supply is used, ground the housing with a protective
ground wire using a grounding screw on the right side of the power supply
module (see Appendix 3 for details).