Elgas EDT 101, User Manual

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11
3
Installation
3.1 Mechanical Installation
Temperature transducer is intended for mounting into a thermowell on piping. Operating
position of the transducer is arbitrary. The depth of the thermowell must be 50 mm minimum.
The transducer stem must be inserted to the very bottom of the thermowell and secured by
the fastening nut against pulling-out. It is recommended to fill the space around the stem
inside the thermowell with silicone oil.
3.2 Electrical installation
Wires in the cable or the connector pins carry the following signals:
Signal Description color
GND negative power rail (ground) green
PWR positive power rail brown
DATA- RS 485 inverted data signal yellow
DATA+ RS 485 non-inverted signal white
To operate the transducer, apply DC voltage 2.8 to 5.0 V across PWR and GND terminals and
connect the DATA+, DATA- signals with the corresponding terminals on the host RS 485 port.
The transducer does not provide electrical insulation between the RS 485 bus and the
transducer power supply.
Fig. 3 shows connection of the transducers into the data network. In the RS 485 network, up
to 32 units can be connected at the same time while every unit must have a unique slave
address set.