Endress+Hauser NRF81 Brief Operating Instructions

Tankside Monitor NRF81 Electrical connection
Endress+Hauser 11
6 Electrical connection
6.1 Connecting requirements
6.1.1 Cable specification
Terminals
Wire cross section 0.2 to 2.5 mm
2
(24 to 13 AWG)
Use for terminals with function: Signal and power supply
• Spring terminals (NRF81-xx1...)
• Screw terminals (NRF81-xx2...)
Wire cross section max. 2.5 mm
2
(13 AWG)
Use for terminals with function: Ground terminal in the terminal compartment
Wire cross section max. 4 mm
2
(11 AWG)
Use for terminals with function: Ground terminal at the housing
Power supply line
Standard device cable is sufficient for the power line.
HART communication line
• Standard device cable is sufficient if only the analog signal is used.
• Shielded cable is recommended if using the HART protocol. Observe the grounding concept
of the plant.
Modbus communication line
• Observe the cable conditions from the TIA-485-A, Telecommunications Industry
Association.
• Additional conditions: Use shielded cable.
V1 communication line
• 2-wire twisted pair, screened or unscreened cable
• Resistance in one cable: ≤ 120 Ω
• Capacitance between lines: ≤ 0.3 µF
WM550 communication line
• 2-wire twisted pair, unscreened cable
• Cross section minimum 0.5 mm
2
(20 AWG)
• Maximum total cable resistance: ≤ 250 Ω
• Cable with low capacitance

Endress+Hauser NRF81 Specifications

General

Brand	Endress+Hauser
Model	NRF81
Category	Measuring Instruments
Language	English