Endress+Hauser Micropilot FMR67B - Page 20

Electrical connection Micropilot FMR67B HART
20 Endress+Hauser
11.2.1 Supply voltage
The supply voltage depends on the selected type of device approval
Non-hazardous, Ex d, Ex e 10.5 to 35 V
DC
Ex i 10.5 to 30 V
DC
Nominal current 4 to 20 mA
The power unit must be tested to ensure it meets safety requirements (e.g., PELV, SELV,
Class 2) and complies with the relevant protocol specifications.
A suitable circuit breaker must be provided for the device in accordance with IEC/EN61010-1
11.2.2 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)