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High Accuracy Wet/Wet Pressure Transducer www.omega.com
e-mail: info@omega.com
Users Guide
PX938
High Accuracy
Wet/Wet Differential Sensor Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGAOf Course!
TEMPERATURE
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Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
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Wire: Thermocouple, RTD & Thermistor
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Calibrators & Ice Point References
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Recorders, Controllers & Process Monitors
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Infrared Pyrometers
PRESSURE, STRAIN AND FORCE
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Transducers & Strain Gages
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Load Cells & Pressure Gages
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Displacement Transducers
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Instrumentation & Accessories
FLOW/LEVEL
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Rotameters, Gas Mass Flowmeters & Flow Computers
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Air Velocity Indicators
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Turbine/Paddlewheel Systems
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Totalizers & Batch Controllers
pH/CONDUCTIVITY
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pH Electrodes, Testers & Accessories
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Benchtop/Laboratory Meters
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Controllers, Calibrators, Simulators & Pumps
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Industrial pH & Conductivity Equipment
DATA ACQUISITION
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Data Acquisition & Engineering Software
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Communications-Based Acquisition Systems
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Plug-in Cards for Apple, IBM & Compatibles
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Datalogging Systems
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Recorders, Printers & Plotters
HEATERS
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Heating Cable
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Cartridge & Strip Heaters
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Immersion & Band Heaters
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Flexible Heaters
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Laboratory Heaters
ENVIRONMENTAL
MONITORING AND CONTROL
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Metering & Control Instrumentation
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Refractometers
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Pumps & Tubing
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Air, Soil & Water Monitors
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Industrial Water & Wastewater Treatment
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pH, Conductivity & Dissolved Oxygen Instruments
Servicing North America:
USA:
One Omega Drive, P.O. Box 4047
ISO 9001 Certified
Stamford CT 06907-0047
TEL: (203) 359-1660
FAX: (203) 359-7700
e-mail: info@omega.com
Canada:
976 Bergar
Laval (Quebec) H7L 5A1
TEL: (514) 856-6928
FAX: (514) 856-6886
e-mail: info@omega.ca
For immediate technical or application assistance:
USA and Canada:
Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA®
Customer Service: 1-800-622-2378 / 1-800-622-BEST®
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN®
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Mexico:
TEL: (001) 800-826-6342 FAX: (001) 203-359-7807
En Espanol: (001) 203-359-7803
e-mail: espanol@omega.com
info@omega.com.mx
Servicing Europe:
Benelux:
Postbus 8034, 1180 LA Amstelveen, The Netherlands
TEL:
+31 (0)20 6418405
FAX: +31 (0)20 6434643
Toll Free in Benelux: 0800 0993344
e-mail: nl@omega.com
Czech Republic:
Rudé armády 1868, 733 01 Karviná 8
TEL: +420 (0)69 6311899
FAX: +420 (0)69 6311114
Toll Free in Czech Republic: 0800-1-66342
e-mail:czech@omega.com
France:
9, rue Denis Papin, 78190 Trappes
TEL: +33 (0)130 621 400
FAX: +33 (0)130 699 120
Toll Free in France: 0800-4-06342
e-mail: france@omega.com
Germany/Austria:
Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
TEL: +49 (0)7056 3017
FAX: +49 (0)7056 8540
Toll Free in Germany: 0800 TC-OMEGASM
e-mail: germany@omega.com
United Kingdom:
One Omega Drive, River Bend Technology Centre
ISO 9002 Certified
Northbank, Irlam, Manchester
M44 5EX United Kingdom
TEL: +44 (0)161 777 6611
FAX: +44 (0)161 777 6622
Toll Free in United Kingdom: 0800 488 488
e-mail: sales@omega.co.uk
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,
patient-connected applications.
OMEGAnet®On-Line Service
www.omega.com
Internet e-mail
info@omega.com
M-3297/0300 Installation
CAUTION:
1. I
NCORRECT

ELECTRICAL

CONNECTIONS

CAN
,
IN

CERTAIN

CIRCUMSTANCES
,
DESTROY

THE
ELECTRONIC

OUTPUT

CIRCUIT
.
2. B
EFORE

APPLYING

ELECTRICAL

POWER
,
MAKE

SURE

THE

SUPPLY

VOLTAGE

IS

TO

THE

CORRECT
RATING
.
3. T
HIS

IS

A

VERY

SENSITIVE

SENSOR
,
ONLY

APPLY

PRESSURE

WITHIN

THE

PRESSURE

RANGE
.
Mounting
Two M5 threaded holes in the base of the sensor provide mounting points.
Note:
The screws must not enter the holes more than 0.472" into the sensor body.
The installed position of the sensor should be away from sudden temperature
variations, shocks and vibrations and should not be close to strong electromagnetic
fields (transformers, motors etc.). The sensor can be mounted in any position, but
mounting at an angle may require zero adjustment. For very low pressure sensors
(less than 0.08 inH
2
O) the recommended mounting is horizontal.
cable
gland
Internal detail
Electromagnetic Interference
To avoid electrical interference, use shielded cable with the shield connected to earth
ground at both ends. The ground of the sensor can be the casing or the ground
terminal screw.
terminal
block
zero
adjustment
(coarse)
zero adjustment
(fine)
Electrical Connections
PX938 Series (current output)
The maximum allowable load resistance is
calculated to the formula:
R Max =0.05 (V supply - 10) k
W
Where: R Max in k
W
and V in Volts
span adjustment
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGAS CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the
return package and on any correspondence. The purchaser is responsible for shipping charges,
freight, insurance and proper packaging to prevent breakage in transit.
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGAs WARRANTY adds an additional one
(1) month grace period to the normal one (1) year product warranty to cover handling and
shipping time. This ensures that OMEGAs customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGAs Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired
or replaced at no charge. OMEGAs WARRANTY does not apply to defects resulting from any
action of the purchaser, including but not limited to mishandling, improper interfacing, operation
outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if
the unit shows evidence of having been tampered with or shows evidence of having been
damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper
specification; misapplication; misuse or other operating conditions outside of OMEGAs control.
Components which wear are not warranted, including but not limited to contact points, fuses, and
triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes
liability for any damages that result from the use of its products in accordance with
information provided by OMEGA, either verbal or written. OMEGA warrants only that the
parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO
OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR
IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WAR-
RANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are
exclusive, and the total liability of OMEGA with respect to this order, whether based on
contract, warranty, negligence, indemnification, strict liability or otherwise, shall not
exceed the purchase price of the component upon which liability is based. In no event
shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a
Basic Component under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or
(2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA
assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and,
additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or
damage whatsoever arising out of the use of the Product(s) in such a manner.
FOR WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which the
product was PURCHAS