Rockwell Automation 1414-CHDxxxxx_CHZxxxxx_IHD20GKRAA_IHZ20GKRAA Space Humidity Transmitter - Manual (Page 3)

Space Humidity Transmitter 3
Publication 1414-IN016A-EN-P - October 2005
Install the Space Humidity Transmitter
Transmitters can be mounted directly on a wall or to a wall box. For the most
accurate results, units should be mounted on an inside wall to a wall box,
approximately 3 to 5 feet from the floor, away from any supply air exhausts and
other sources of heat or cold. The enclosure cover is held in place with a locking
tab located to the left of center at the bottom of the enclosure. After installation the
cover can be locked on with the set screw (1/16” or 1.5 mm) at the bottom of the
enclosure.
Wire/Connect the Space Humidity Transmitter
Anti-static precautions should be followed to prevent damage to the device.
The transmitter should be connected to the controller using twisted-pair 18 to 22
AWG wire and requires two wires for DC 4 to 20 mA loop-powered operation. Use
shielded cable for the highest noise immunity. Do not route signal wires in the
same conduit with power cables as signal degradation may occur. The controller
Analog Input (AI) must be selected to match the transmitter output before power is
applied. The AI type must be a current input with 250 or 500 ohm impedance. All
transmitters have an operating range of 0 to 70 °C (32 to 158 °F) The transmitter
board should not be mounted where temperatures will exceed these values. See the
connection diagram for more details. The optional LCD display is powered by the
same supply as the transmitter.
Wire Connections For Relative Humidity Boards
The temperature sensor optional output is on the two terminals marked TEMP.
Typical wiring to a controller is shown in the connection diagram.
For 4 to 20 mA loop signal, only the PWR and OUT terminals are used.
POWER
SIGNAL OUT
COMMON
SPAN
ZE
R
O
Space Humidity transmitter
(with optional LCD)
+ 24 VDC -
ANL IN 0 +
ANL IN 0 -
Analog Current Input
ANL COM
Loop power supply
RH Transmitter - Loop powered
PWR
COM
(SIG) OUT