Rotronic HF5 User Manual download pdf (Page 16)

E-M-HF5-V1_25

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF5 Humidity Temperature

Transmitters: User Guide

Instruction Manual

Document Type

Page

16 of 30

Document title

6.4 Wiring

6.4.1 HF52: 2-wire, loop powered transmitter

Electrical diagram

The maximum permissible cable length connecting

the HF52 to other devices is determined by the total

resistance resulting from the addition of the cable

resistance and that of the devices connected in series

with the unit. This resistance should not exceed 500

ohms.

Terminal block diagram

Note: connect the + of the power supply to only one of the V+ terminals. The two terminals marked V+ are

internally connected.

Measuring humidity or temperature only

Unless configured to measure either humidity only or temperature only, proper operation of the HF52 requires

both current loops to be closed. The HF52 can be directly ordered from the factory to measure either humidity

or temperature only. When necessary, any unused output of the HF52 can be disabled with the ROTRONIC

HW4 software. When the HF52 is configured with one of the two outputs disabled, close only the loop that is

being used.

Terminals

Description

K2-2: T-OUT

Temperature output (+)

OUT-2

K2-1: V+

Power supply: 10…28 VDC (+)

Terminals

Description

K1-2: H-OUT

Relative humidity or dew point (+)

OUT-1

K1-1: V+

Power supply: 10…28 VDC (+)

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Rotronic HF5 User Manual Page 16

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