Endress+Hauser iTEMP TMT82, Краткое руководство по эксплуатации, Страница: 17 / 28

iTEMP TMT82 Electrical connection
Hauser 17
-
+
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
conn.
®
Test
RTD, 3- and 2-wire : Ω
RTD, 4-, 3- and 2-wire : Ω
white
red
red
white
white
red
red
TC, mV
TC, mV
(black)
(yellow)
(black)
A0019071-EN
 10 Terminal assignment of the DIN rail device
A To check the output current, an ammeter (DC measurement) can be connected between the "Test" and
"-" terminals.
A minimum load of 250 Ω is required in the signal circuit in order to operate the HART
®
transmitter via the HART ® protocol (terminals 1 and 2).
NOTICE
‣
ESD - electrostatic discharge. Protect the terminals from electrostatic discharge. Failure
to observe this may result in the destruction or malfunction of parts of the electronics.
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
  - 