Endress+Hauser iTEMP TMT82 - Connecting the Sensor Cables

Wiring iTEMP TMT82
18 Endress+Hauser
Terminal assignment of DIN rail transmitter
-
+
A
TMT82
ON
6
3
7
4
8
5
1/+
2/- Test
8
7
6
5
6
4
3
1
2
Sensor input 2
Sensor input 1
Supply voltage
4...20 mA
HART
®
connection
Test
RTD, Ω 3- and 2-wire:
RTD, Ω 4-, 3- and 2-wire:
white
red
red
white
white
red
red
TC, mV
TC, mV
(black)
(black)
(yellow)
A0017807-EN
 9 Assignment of terminal connections for DIN rail device
A To check the output current, an amperemeter (DC measurement) can be connected between the "Test" and "-" terminals.
To operate the device via the HART
®
protocol (terminals 1 and 2), a minimum load of 250
Ω is required in the signal circuit.
NOTICE
‣
ESD - electrostatic discharge. Protect the terminals from electrostatic discharge.
Failure to observe this may result in destruction or malfunction of parts of the
electronics.
5.2 Connecting the sensor cables
Terminal assignment of the sensor connections→  8,  17.
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
   