Installation Instructions
Relative Humidity Transmitter
Catalog Number(s) 1414-IHZ20AKOAA,
1414-IHZ20AKDAA, 1414-CHZ30PKOAA,
1414-CHZ30PKDAA
About Relative Humidity Transmitter
The Relative Humidity transmitter uses a capacitive type humidity sensor and
microprocessor temperature compensation for reliable, accurate readings.
Publication 1414-IN007A-EN-P - October 2005
2
Relative Humidity Transmitter
Important User Information
Solid state equipment has operational characteristics differing from those of electromechanical equipment.
Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication
SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.literature.rockwellautomation.com) describes some important differences between solid state
equipment and hard-wired electromechanical devices. Because of this difference, and also because of the
wide variety of uses for solid state equipment, all persons responsible for applying this equipment must
satisfy themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many
variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot
assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc., is prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
WARNING
IMPORTANT
ATTENTION
Identifies information about practices or circumstances that can cause an explosion in
a hazardous environment, which may lead to personal injury or death, property
damage, or economic loss.
Identifies information that is critical for successful application and understanding of
the product.
Identifies information about practices or circumstances that can lead to personal injury
or death, property damage, or economic loss. Attentions help you identify a hazard,
avoid a hazard and recognize the consequences.
SHOCK HAZARD
Labels may be located on or inside the equipment (e.g., drive or motor) to alert people
that dangerous voltage may be present.
BURN HAZARD
Labels may be located on or inside the equipment (e.g., drive or motor) to alert people
that surfaces may be dangerous temperatures.
Publication 1414-IN007A-EN-P - October 2005
Relative Humidity Transmitter
3
Install Relative Humidity Transmitter
The Relative Humidity Transmitter can be mounted in a duct or outside the
structure.
Duct - Drill a 5/8“ (or larger) hole in the return air duct. Remove the protective
plastic sleeve from the probe and place it through the hole and secure the
enclosure to the duct with sheetmetal screws. Orientation of the enclosure and
probe has no effect on the operation of the device.
Outside Air – For best results, locate the sensor on the north side of the structure
high under an eave to prevent incorrect readings from direct sunlight and damage
due to the elements. Mount the OSA enclosure with the sensor module facing down
to prevent the accumulation of dirt or water.
Wire/Connect Relative 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 three wires for voltage and AC operation while only two
wires are required for the factory-default 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. Duct
and O.S.A. transmitters have an operating range of –40 to 80 °C (-40 to 170 °F). The
transmitter board should not be mounted where temperatures will exceed these
values. See the connection diagram for more details.
Wire Connections For Relative Humidity Boards
Typical wiring to a controller is shown in the connection diagram.
Loop power supply
PWR
OUT
+
10
5
1
COM
24 VDC
-
Analog Current/
Voltage Input
VOLTAGE
PWR
CURRENT
ANL IN 0 +
(SIG) OUT
ANL IN 0 -
COM
SPAN
COM wired only for
voltage outputs
ANL COM
ZERO
RH Transmitter - Loop powered
or Voltage output
Publication 1414-IN007A-EN-P - October 2005
Specifications
Relative Humidity Transmitter - Specifications
Specification
Value
Accuracy
+/- 2 or 3 % RH
Power Supply
24Vac/dc
Wiring Connections
Screw connectors (18-24 awg)
Output (scaled 0-100%)
4…20mA, 0…1, 0…5, 0…10V dc (jumper selectable)
Operating Temperature
-40…80 ºC
All other trademarks are the property of their respective holders, and are hereby acknowledged.
Publication 1414-IN007A-EN-P - October 2005
Supersedes Publication XXXX-X.X.X - Month Year
PN 40055-237-01(1)
Copyright © 2005 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
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