Electrical connections________________________________________________________________
Vaisala _________________________________________________________________________ 23
CHAPTER 4
ELECTRICAL CONNECTIONS
Refer to local requirements regarding cabling, grounding and galvanic
isolator or barrier connections.
WARNING
Be sure that the main power switch of the transmitter is set off before
making any electrical installations in hazardous areas.
1. Open the transmitter cover and remove the protective cover of
the transmitter base.
2. Thread the power supply wires through the cable gland (Figure
3-2, item 7)
3. Connect the unpowered power supply wires to the connectors:
CH1 (humidity) and CH2 (temperature). Both channels require
an own power supply. NOTE! As CH1 is a main output, the
transmitter does not operate if only CH2 is connected (CH2 is
optoisolated from transmitter electronics).
4. Replace the protective cover. Turn the transmitter on ON with
the ON/OFF switch (Figure 9-1, item 2).
5. Close the cover. The transmitter is ready for use.
When using the transmitter in hazardous places, the use of
galvanic isolators or barriers is essential. The following barrier &
isolator are available in Vaisala: barrier No. 210664 (STAHL
9001/51-280-091-141) for USA&Canada and galvanic isolator
No. 212483 (STAHL 9160/13-11-11) or barrier No. 210664 for
EU. Examples of connections are presented on page 25.
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