Omega EWS-RH User Manual

www.omega.com

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User’s Guide

EWS-RH

Relative Humidity/Temperature

Transmitter

MADE IN

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

TABLE OF

CONTENTS

EWS-RH

Relative Humidity/Temperature Transmitter

i

Page

General Description .................................................................... 1

Unpacking .................................................................................... 1

Theory of Operation ................................................................... 1

Mounting ..................................................................................... 3

RH/Temperature Calculations ................................................. 5

Calibration ....................................................................................6

Relative Humidity Calibration Procedure ...............................6

Temperature Calibration Procedure ........................................ 7

Specifications ............................................................................... 8

FIGURES

EWS-RH
Relative Humidity/Temperature Transmitter

ii

Figure Page

Figure 1 Mounting Diagram............................................................ 3

Figure 2 Transmitter Wiring Examples For Current Output...... 4

Figure 3 Transmitter Wiring Examples For Voltage Output ..... 4

Figure 4 Relative Humidity Calibration Procedure ..................... 6

Figure 5 Temperature Calibration Procedure ............................... 7

EWS-RH

Relative Humidity/Temperature Transmitter

1

General Description

The OMEGA®Model EWS-RH is a combination dual output, relative
humidity/temperature transmitter. A thin film temperature
compensated, polymer capacitor senses relative humidity while a solid
state temperature sensor measures ambient temperature. Independent
user selectable 4-20 mA or 1-5 Vdc outputs are provided for both
measured parameters via a terminal strip connection.

Unpacking

Remove the packing list and verify that you have received all your
equipment. If you have any questions about the shipment, please call
our Customer Service Department at

1-800-622-2378 or 203-359-1660. On the web you can find us at:

www.omega.com e-mail: [e-mail]

When you receive the shipment, inspect the container and equipment
for any signs of damage. Note any evidence of rough handling in
transit. Immediately report any damage to the shipping agent.

NOTE: The carrier will not honor any damage claims unless
all shipping material is saved for inspection. After
examining and removing contents, save packing material
and carton in the event reshipment is necessary.

The following items are supplied in the box with your transmitter.

This Manual, # M-3501 (1 ea.)

Dewpoint Card (1 ea.)

#6 Wall Anchor (2 ea.)

#6 Mounting Screw (2 ea.)

NOTE