BA 3527161/02 EN
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A separate shielded cable is recommended for the wir-
ing to the 4 - 20 mA analogue output. This includes the
Supply Voltage and the mA output signal (= terminals
61, 62 and 63). No other signals should be wired
through the same cable and make sure the shield is
connected to ground on one side only.
4.3 Analog output 4 - 20 mA current loop signal
and 0 - 5 V DC Voltage output (see also chapter 8.3
for installation examples)
This analogue output is an optional feature to the
MESSKO
®
BeTech Oil and Winding Temperature Indi-
cators. There are two outputs provided, both are linear
and proportional to the indicated temperature on the
instrument dial, where 4 mA and 0 V DC is provided at
the lowest value on the dial and 20 mA and 5 V DC at
the highest value (see graph).
The outputs can be used for several purposes such as
connection to a computer, to a SCADA system or for
remote monitoring by Remote Analogue or Digital Indi-
cators. A common installation is to use the mA signal for
remote monitoring and the V DC output for a SCADA or
computer connection.
Since the outputs are provided from the indication,
the same temperature is displayed both locally and
remotely - no differences because of settings etc as if
separate transmitters are used.
The electrical wiring is easily connected to the terminal
board inside the OTI or WTI (see appendix, chapter 8.3).
A separate shielded cable is recommended for the
wiring to this analogue output. This includes the Supply
Voltage and the mA and V DC output signals (= ter-
minals 61, 62, 63 and 64). No other signals should be
wired through the same cable and make sure the shield
is connected to ground on one side only.
If only the Voltage output is to be used, the mA output
must remain short circuited. Please leave the clamp in
place on terminals 61 and 62.
CAUTION
The terminals 61, 62, 63 and 64 must be short-
circuited during insulation test. The test voltage
must be raised gradually. Remove the clamps on
the terminal board once the tests are finished.
Fig. 4