Electrical connection iTEMP TMT82
20 Endress+Hauser
5.3 Connecting the sensor cables
NOTICE
When connecting 2 sensors ensure that there is no galvanic connection between the
sensors (e.g. caused by sensor elements that are not isolated from the thermowell). The
resulting equalizing currents distort the measurements considerably.
‣
The sensors must remain galvanically isolated from one another by connecting each sensor
separately to a transmitter. The transmitter provides sufficient galvanic isolation (> 2 kV
AC) between the input and output.
The following connection combinations are possible when both sensor inputs are assigned:
Sensor input 1
Sensor input 2
RTD or
resistance
transmitter, 2-
wire
RTD or
resistance
transmitter, 3-
wire
RTD or
resistance
transmitter, 4-
wire
Thermocouple
(TC), voltage
transmitter
RTD or resistance
transmitter, 2-wire
-
RTD or resistance
transmitter, 3-wire
-
RTD or resistance
transmitter, 4-wire
- - - -
Thermocouple (TC),
voltage transmitter
For field mount housing with sensor input 1 thermocouple: It is not possible to connect a second
thermocouple (TC), RTD, resistance transmitter or voltage transmitter on sensor input 2 as this
input is needed for the external reference junction.
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