E-m-hf3-v1_22 – ROTRONIC HF3 User Manual

Page 17

E-M-HF3-V1_22

Rotronic AG
Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF3 Transmitters and Thermo-
hygrostats: User Guide

Instruction Manual

Document Type

Page 17 of 27

Document title

Terminal block diagram for type D and W

L1 : LED for relay 1 (lit when relay is energized)
L2 : LED for relay 2 (lit when relay is energized)
P1 : Set point adjustment potentiometer for relay 1
P2 : Set point adjustment potentiometer for relay 2

Note: the parameter (relative humidity, temperature, dew or frost point) corresponding to each relay can be
changed with the HW4 software.

6.3.4

Grounding (HF32, HF33 and HF34)

We generally recommend grounding the (-) side of the power supply, especially if the electronics will be
subjected to a low humidity environment (35 %RH or less).

Terminals

Description

K1-1

Power supply: 15…40 VDC (+)
or 12…28 VAC (Phase)

K1-2

Power supply (-) or neutral / ground

K2-1

Relay 1: humidity. Normally closed

K2-2

Relay 1: humidity. Common

K2-3

Relay 1: humidity. Normally open

K3-1

Relay 2: temperature. Normally
closed

K3-2

Relay 2: temperature. Common

K3-3

Relay 2: relative temperature.
Normally open