Manual

E-M-HF5-V1_25

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF5 Humidity Temperature

Transmitters: User Guide

Instruction Manual

Document Type

Page

15 of 30

Document title

Bus signals such as RS485

Data signals for PCs, printers etc.

shielded analog inputs

unshielded direct current (<= 60V)

shielded process signals (<= 25 V)

unshielded alternate current (<= 25V)

coaxial cables for CRT monitors

in common bundles or channels / conduits

direct current from 60 V to 400 V

(unshielded)

alternate current from 25V to 400 V

(unshielded)

in separated bundles or channels /

conduits, without minimum distance

direct and alternate current > 400 V

(unshielded)

Telephone lines

lines leading into EX-rated areas

in separated bundles or channels /

conduits, without minimum distance

Lightning protection

Cabling in areas with a risk of lightning requires a lightning protection. For cabling underground in between

buildings, we recommend the use of special fiber optic cables. If this is not possible, use copper cables that

are suitable for underground installation.

6.2 Guidelines for RS-485 wiring (HF53 with digital option and HF55)

See document E-DV04-RS485.01: RS485 Network Installation and Start-up Guidelines

6.3 Cable grip and cable specifications

The HF5 is supplied either with one M16 sealing cable grip or with a ½” conduit adapter. The M16 cable grip

provides effective sealing only with cables having the proper outside diameter. Preferably, use a cable with an

outside diameter of 6 to 7 mm (0.236 to 0.275 inch) with 18 AWG wires.