ROTRONIC HF5 - Manual (Page 15)

E-M-HF5-V2_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF5 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 15 of 36
Document title
© 2009-2013; Rotronic AG E-M-HF5-V2_12
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
Operation of the HF52 does not require both current loops to be closed. When using the HF52 to measure
either humidity only or temperature only, close only the loop that is being used.
Using the ROTRONIC HW4 software, any unused output of the HF52 can be disabled.
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 (+)