Operating Instructions

Electrical connection Micropilot FMR60B HART
24 Endress+Hauser
10.5
11.0
12.5
13.5
14.5
15.5
16.5
17.5
18.5
I
LOOP
U
3.6 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4
A
B
C
A0047056
A Display lighting switched on, Bluetooth can be switched on optionally
B Display lighting switched off, Bluetooth can be switched on optionally
C Display lighting switched off and Bluetooth not active
6.2.2 Cable specification
Rated cross-section
• Supply voltage
0.5 to 2.5 mm
2
(20 to 13 AWG)
• Protective earth or grounding of the cable shield
> 1 mm
2
(17 AWG)
• External ground terminal
0.5 to 4 mm
2
(20 to 12 AWG)
Cable outer diameter
The cable outer diameter depends on the cable gland used
• Coupling, plastic:
⌀5 to 10 mm (0.2 to 0.38 in)
• Coupling, nickel-plated brass:
⌀7 to 10.5 mm (0.28 to 0.41 in)
• Coupling, stainless steel:
⌀7 to 12 mm (0.28 to 0.47 in)
6.2.3 4 to 20 mA HART
2
3
4
Y
+ +
- -
I
1
mA
A0028908
 3 Block diagram of HART connection
1 Device with HART communication
2 HART communication resistor
3 Power supply
4 Multimeter or ammeter
The HART communication resistor of 250 Ω in the signal line is always necessary in
the case of a low-impedance power supply.
Take the voltage drop into consideration:
Maximum 6 V for a 250 Ω communication resistor