Endress+Hauser Prothermo NMT81 - NMS8 x;NMR8 x;NRF81 (Ex d [ia]) Intrinsically Safe Connection

Electrical connection Prothermo NMT81
38 Endress+Hauser
6.2 NMT81 transmitter and element connection
Four-wire common return enables the highest accuracy in the narrowest probe in a limited
tank nozzle opening. The wiring diagram shows the configuration as follows.
A
3
4
3
2
1
3 4
a
b
A0042780
 33 Four-wire connection diagram
A Sensor unit
a Current flow
b Voltage measurement
1 Connector 1
2 Connector 2
3 Connector 3
4 Connector 4
6.3 NMS8x/NMR8x/NRF81 (Ex d [ia]) intrinsically safe
connection
To connect an intrinsically safe NMT81, E1 and E2 are used to connect with NMS8x,
NMR8x and NRF81.
D
E
F
C
B
A
1
1
1
13
2
24
1
HR
CDI
WP
on
SIM
2
2
3
3
4
4
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
i
G
1
3
2
POWER
E
1
1
2
CDI
i
A0038531
 34 NMS8x terminal for NMT81
E1 + terminal
E2 - terminal