Install Instructions
INSTALLATION
Duct Mount
The transmitter should be mounted away from fans, corners, heating and cooling coils,
and other equipment that will effect the measurement of the relative humidity. It should
also be mounted in a location that receives adequate air ow for proper operation.
The transmitter should be mounted such that the conduit connection points down to
prevent moisture from entering.
1. Drill a 1˝ diameter hole into the duct at the desired location.
2. Insert the transmitter probe through the hole such that the mounting ange is
ush to the duct.
3. Use three #8 x 1/2˝ pan head sheet metal screws to attach the mounting ange to
the duct. Do not over tighten.
4. Remove top screw cover to access wiring terminals.
OSA (Outside Air)
The transmitter should be mounted under an eave, shield, or in an area that is out of
the elements or direct sunlight. The transmitter should be mounted with the sensor
pointing down to prevent water collection in the sensor cavity.
1. Remove the cover plugs from the face of the unit and the top cover.
2. Position the transmitter where it is to be mounted and mark the mounting holes in
each corner of the housing.
3. Drill or punch out marked locations.
4. Place the transmitter box over mounting holes on wall and align. Install wall mount
screws (not provided) in mounting holes.
5. Proceed with wiring according to Figure 1.
6. Replace cover and cover plugs on the face of the unit.
WIRING
Use maximum 18 AWG wire for wiring terminals. Refer to Figure 1 or Figure 2 for
wiring information. Terminal blocks are removable for ease of wiring.
4-20 mA Output Models with Thermistor, RTD or No Temperature Sensor
4-20 mA output units may be powered with a 10-35 VDC supply. (Wire as shown in
Figure 1).
Disconnect power supply before installation to prevent electrical
shock and equipment damage.
Make sure all connections are in accordance with the job wiring diagram and in
accordance with national and local electrical codes. Use copper conductors only.
WARNING
Use electrostatic discharge precautions (e.g., use of wrist straps)
during installation and wiring to prevent equipment damage.
Avoid locations where severe shock or vibration, excessive moisture or corrosive
fumes are present. NEMA Type 4X (IP65) housings are intended for outdoor use
primarily to provide a degree of protection against wind-blown dust, rain, and hose-
directed water.
Do not exceed ratings of this device, permanent damage not covered by warranty may
result. The 4-20 mA models are not designed for AC voltage operation.
CAUTION
Figure 1
POWER
SUPPLY
TEMP
SENSOR
[IF PRESENT]
RH RECEIVER
1 2 3 4
Dual 4-20 mA RH/Temperature Output Models
Dual 4-20 mA output units may be powered with a 10-35 VDC supply. The following
describes the proper wiring of these transmitters: The model RHP transmitter with
dual 4-20 mA output is designed as a 2-wire 4-20 mA device with two channels. The
channels are common on the positive side of the current loop. Sensor excitation power
is derived from the RH channel, so power must always be applied to that channel. If
the temperature channel is not used, it can be left disconnected. Wire as shown in
Figure 2.
Note: If the RH output is not required, wire the “-” terminal of the power supply to
terminal 1.
0-5 V and 0-10 V Output Models with Thermistor, RTD, or No Temperature Sensor
The 0-5 V and 0-10 V output models may be powered with 15-35 VDC or 15-29 VAC.
Note polarity when using DC power. The maximum load is 5 mA. Wire as shown in
Figure 3.
Dual 0-5 V and 0-10 V RH/Temperature Output Models
Dual 0-5 V and 0-10 V output units may be powered with 15-35 VDC or 15-29 VAC.
Note polarity when using DC power. The channels are common on the negative side.
If desired, the RH or, temperature output may be used by itself. Wire as shown in
Figure 4.
Figure 2
POWER
SUPPLY
RH RECEIVER
TEMP RECEIVER
1 2 3 4
Figure 3
POWER
SUPPLY
RH RECEIVER
TEMP
SENSOR
[IF PRESENT]
1 2 3 4 5
Figure 4
POWER
SUPPLY
RH RECEIVER
TEMP RECEIVER
1 2 3 4 5