ROTRONIC HF7 - Manual (Page 13)

E-M-HF7-V1_24
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF7 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 13 of 23
Document title
© 2009-2011; Rotronic AG E-M-HF7-V1_24
Terminal block diagram
Note: connect the + of the power supply to only one of the V+ terminals. The two terminals marked H+V and
T+V are internally connected.
Measuring humidity or temperature only
Unless configured to measure either humidity only or temperature only, proper operation of the HF72 requires
both current loops to be closed. The HF72 can be directly ordered from the factory to measure either humidity
or temperature only. When necessary, any unused output of the HF72 can be disabled with the ROTRONIC
HW4 software. When the HF72 is configured with one of the two outputs disabled, close only the loop that is
being used.
Terminals Description
K1-1: H+V Power supply: 10…28 VDC (+)
K1-2: H-OUT
Relative humidity or dew point (+)
OUT-1
K1-3: T+V Power supply: 10…28 VDC (+)
K1-4: T-OUT
Temperature output (+)
OUT-2