Omega Engineering Wet/Wet Differential Sensor PX838 User manual

www.omega.com
e-mail: [email protected]
User’sGuide
PX838
HighMediaCompatibility
Wet/WetDifferentialSensor

Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…OfCourse!
TEMPERATURE
ee
ee
eThermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
ee
ee
eWire: Thermocouple, RTD & Thermistor
ee
ee
eCalibrators & Ice Point References
ee
ee
eRecorders, Controllers & Process Monitors
ee
ee
eInfrared Pyrometers
PRESSURE,STRAINANDFORCE
ee
ee
eTransducers & Strain Gages
ee
ee
eLoad Cells & Pressure Gages
ee
ee
eDisplacement Transducers
ee
ee
eInstrumentation & Accessories
FLOW/LEVEL
ee
ee
eRotameters, Gas Mass Flowmeters & Flow Computers
ee
ee
eAir Velocity Indicators
ee
ee
eTurbine/Paddlewheel Systems
ee
ee
eTotalizers & Batch Controllers
pH/CONDUCTIVITY
ee
ee
epH Electrodes, Testers & Accessories
ee
ee
eBenchtop/Laboratory Meters
ee
ee
eControllers, Calibrators, Simulators & Pumps
ee
ee
eIndustrial pH & Conductivity Equipment
DATAACQUISITION
ee
ee
eData Acquisition & Engineering Software
ee
ee
eCommunications-Based Acquisition Systems
ee
ee
ePlug-in Cards for Apple, IBM & Compatibles
ee
ee
eDatalogging Systems
ee
ee
eRecorders, Printers & Plotters
HEATERS
ee
ee
eHeating Cable
ee
ee
eCartridge & Strip Heaters
ee
ee
eImmersion & Band Heaters
ee
ee
eFlexible Heaters
ee
ee
eLaboratory Heaters
ENVIRONMENTAL
MONITORINGANDCONTROL
ee
ee
eMetering & Control Instrumentation
ee
ee
eRefractometers
ee
ee
ePumps & Tubing
ee
ee
eAir, Soil & Water Monitors
ee
ee
eIndustrial Water & Wastewater Treatment
ee
ee
epH, Conductivity & Dissolved Oxygen Instruments
Servicing North America:
USA: One Omega Drive, P.O. Box 4047
ISO 9001 Certified Stamford CT 06907-0047
TEL: [phone] FAX: [phone]
e-mail: [email protected]
Canada: 976 Bergar
Laval (Quebec) H7L 5A1
TEL: [phone] FAX: [phone]
e-mail: [email protected]
For immediate technical or application assistance:
USAandCanada: 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: [phone] FAX: [phone]
En Espan˜ol: [phone]-7803
e-mail: [email protected]
[email protected]
ServicingEurope:
Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands
TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [email protected]
CzechRepublic: Rudé armády 1868, 733 01 Karviná 8
TEL: [phone] FAX: [phone]
Toll Free in Czech Republic: 0800-1-66342
e-mail:[email protected]
France: 9, rue Denis Papin, 78190 Trappes
TEL: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342
e-mail: [email protected]
Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 TC-OMEGASM
e-mail: [email protected]
UnitedKingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certified Northbank, Irlam, Manchester
M44 5EX United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in United Kingdom: 0800 488 488
e-mail: [email protected]
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-LineService
www.omega.com Internet e-mail [email protected]
M-3296/0300

RETURNREQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORERETURNING ANYPRODUCT(S)TOOMEGA,PURCHASERMUST OBTAIN ANAUTHORIZED
RETURN(AR)NUMBERFROMOMEGA’SCUSTOMERSERVICEDEPARTMENT(IN ORDERTOAVOID
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. OMEGA’s 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 OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s 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. OMEGA’s 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 OMEGA’s 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
OTHERWARRANTIES OR REPRESENTATIONSOFANYKIND WHATSOEVER,EXPRESS OR
IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WAR-
RANTYOF 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 PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
following information available BEFORE contact-
ing OMEGA:
1. Purchase Order number to cover the COST of
the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improve-
ment is possible. This affords our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may
not be copied, photocopied, reproduced, translated, or reduced to any electronic
medium or machine-readable form, in whole or in part, without the prior written consent
ofOMEGA ENGINEERING, INC.
Installation
CAUTION:
1. INCORRECT ELECTRICAL CONNECTIONS CAN, IN CERTAIN CIRCUMSTANCES, DESTROY THE ELECTRONIC OUTPUT
CIRCUIT.
2. BEFORE APPLYING ELECTRICAL POWER, MAKE SURE THE SUPPLY VOLTAGE IS TO THE CORRECT RATING.
3. THIS AVERY 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.
terminal
block zero adjustment (fine)
zero adjustment
(coarse)
span adjustment
cable gland
Internal detail
Electromagnetic Interference
To avoid electrical interference, use shielded cable with the shield connected to the earth
ground at both ends. The ground of the sensor can be the casing or the ground terminal
screw.
Electrical Connections
PX838 Series (current output)
The maximum allowable load resistance is calculated to
formula: R Max = 0.05 (V supply - 10) kW
Where: R Max in kWand V in Volts
Minimum load 2kW
Note: Connections 5 and 6 are common.
If the output cable passes through an area of electrical
disturbance, use a recommended load impedance of
between 2 kWand 10 kW. Connect the load resistance
between the wires corresponding to signal and - terminal at
a point furthest from the sensor; this produces a circulating
current.
PX838 Series (Unidirectional voltage output)

PX838 Series bidirectional operation using
bipolar power supply (±12Vdc) with bidirectional
output (0±5 Vdc or 0±2.5 Vdc)
SIGNAL0
Purging or de-gassing the sensor
Two 5 mm hexagonal socket bleed screws are located on the outer casing and can be
loosened to bleed the two pressure connections. Make sure that these screws are
tightened after this operation.
Note: It is possible to changeover the bleed screws and pressure connections enabling
easier access or for installation in a difficult position.
Adjustments
The following equipment is required to carry out the adjustments:
rPower supply
rVoltmeter or
rMilli-ammeter
rPressure standard
uConnect the sensor as shown in Installation. The sensor should be put in its normal
operating position (vertical or horizontal). Remove the cover to gain access to the zero
and span adjustment potentiometers.
Zero adjustment
uZero adjustment is carried out with no pressure applied.
uDepending on the model, set the zero adjustment to: 0.00 V, 2.50 V, 4.00 mA or 12.00 mA
Span adjustment
uSpan adjustment is carried out with the required span pressure applied to the +
pressure connector.
uDepending on the model, set the span adjustment to: 5.00 V, 10.00 V or 20.00 mA.
uRelease the pressure.
Completion
Check the output at zero pressure and if necessary, repeat the zero and span adjustments.
rRelease the pressure and disconnect the equipment.
rRefit the cover.
Specification
Pressure range:..........................................................................................4inH2Oto±150 psid
Pressure media:
X750 diaphragm Any fluids, compatible with stainless steel (316L),
X750 Inconel, 600 Inconel and viton.
Beryllium copper diaphragm Any fluids, compatible with stainless steel (316L),
beryllium copper, brass and soft solder and viton.
Accuracy:...............................................................................................................±0.25%FSBSL
(includinglinearity, hysteresisandrepeatability)
Long term stability:.....................................±0.3%over 1 year at stabilized temperature
Weight
(approximate) ...........................................................................................................3.3lbs
Dimensions.......................................................................................................................seebelow
Power supply
......................................................................................................................................10to30Vd.c.
PX838(0 to10Voutput)........................................................................................16to30V d.c.
PX838(0 to±5Voutput)................................................................................................±12Vd.c.
Dimensions
Connect the power supply to + for positive,
- for negative, and 0 for neutral; connect the output
to signal for positive and 0 for negative signal.
0.68 0.26
High
Low
Pressure Ports:
3.11 Pg7 Cable
Gland
G1/8 Female via
welded adapter
Mounting:
2xM5 holes x 0.472 DP
on 2.66 centers
Purge Ports:
High Pressure
Low Pressure
2.80