ROTRONIC HF62 - Manual (Page 14)

E-M-HF62-V1_11
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroFlex HF62 Humidity Temperature
Transmitters: User Guide
Document title
Page 14 of 27
© 2008; Rotronic AG E-M-HF62-V1_11
Lightning protection
Cabling in areas with a risk of lightning requires a lightning protection. For cabling underground in between
buildings, we recommend the use of special fiber optic cables. If this is not possible, use copper cables that
are suitable for underground installation.
6.2 Cable grip and cable specifications
The HF62 is supplied either with one M16 sealing cable grip or with a ½” conduit adapter. The M16 cable grip
provides effective sealing only with cables having the proper outside diameter. Preferably, use a cable with an
outside diameter of 6 to 7 mm (0.236 to 0.275 inch) with 18 AWG wires.
6.3 Wiring
6.3.1 HF62 standard: 2 x 2-wire, loop powered transmitter
Electrical diagram
The maximum permissible cable length
connecting the HF62 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. On each circuit, this resistance
should not exceed 500 ohms.
Terminal block diagram
Terminals Description
K1-1: H-OUT
Relative humidity or dew point (+)
OUT-1
K1-2: V+
Power supply: 10…28 VDC (+)
Terminals Description
K2-1: T-OUT
Temperature output (+)
OUT-2
K2-2: V+ Power supply: 10…28 VDC (+)
Note:
connect the + of the power supply to each of the V+ terminals (K1-1 and K2-1). These terminals are not
internally connected.