ROTRONIC HF5 - Manual (Page 19)

E-M-HF5-V2_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF5 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 19 of 36
Document title
© 2009-2013; Rotronic AG E-M-HF5-V2_12
6.4.3 HF54: 3-wire transmitter, galvanic isolation of the analog outputs
Electrical diagram for voltage outputs
The maximum permissible cable length
can be determined under consideration
of the voltage drop caused by the
current flowing to the devices connected
to the unit. The voltage drop in the cable
depends both on cable resistance and
on the equivalent resistance of the
devices connected in parallel to the unit.
The total resistance connected to each
unit output should be at least 1000
ohms. Cable resistance should not be
more than 1/1000 of the load resistance.
Electrical diagram for current outputs
The maximum permissible cable length,
connecting the unit 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 (analog outputs only)
U
B
DC
DC
V+
GND
OUT2
OUT1
GND
U
B
DC
DC
V+
GND
OUT2
OUT1
GND