Figure 91 Isolator Unit Wiring - Vaisala PR-23 Series User Manual

- e v + e v
1 2 3
Cable
PR-8260-xxx
(max 100m)
Figure 91 Isolator unit wiring
If the power to isolator unit terminals is not correctly connected, +24 VDC to terminal 14
(+vs) and zero to terminal 13 (-vs), the transmitter STR displays the message NO SIGNAL.
If terminals 11 and 12 are not correctly connected, sensor cable connecting terminal 2 of
the Indicating transmitter STR to the Isolator unit terminal 11 (-ve) and terminal 1 of the
STR to Isolator unit terminal 12 (+ve) , the message NO SIGNAL displays.
ISOLATOR UNIT
4 5 6 7 8 9
- e v + e v
Power cable
-vs
PR-8250-xxx
0 1 1 1 2 1
24VDC
+vs
(max 100m)
Cable
PR-8230-xxx
(max 100m)
Chapter 10 – Sensor specifications
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