Omega Engineering PX548 User manual

www.omega.com
e-mail: [email protected]
User’sGuide
PX548
Wet/WetDifferential
PressureSensor

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USA: One Omega Drive, P.O. Box 4047
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For immediate technical or application assistance:
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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,
patient-connected applications.
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Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…OfCourse!
TEMPERATURE
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eThermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
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eWire: Thermocouple, RTD & Thermistor
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eCalibrators & Ice Point References
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eRecorders, Controllers & Process Monitors
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eInfrared Pyrometers
PRESSURE,STRAINANDFORCE
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eTransducers & Strain Gages
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eLoad Cells & Pressure Gages
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eDisplacement Transducers
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eInstrumentation & Accessories
FLOW/LEVEL
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eRotameters, Gas Mass Flowmeters & Flow Computers
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eAir Velocity Indicators
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eTotalizers & Batch Controllers
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epH Electrodes, Testers & Accessories
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eBenchtop/Laboratory Meters
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HEATERS
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ENVIRONMENTAL
MONITORINGANDCONTROL
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ePumps & Tubing
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eIndustrial Water & Wastewater Treatment
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epH, Conductivity & Dissolved Oxygen Instruments M-3295/0300

Thefollowing equipment isrequired to carryout the adjustments:
rPower supply
rVoltmeter or
rMilli-ammeter
rPressure standard
uConnectthe sensor as shown in Installation.Thesensor should be put in its normal
operating position (vertical or horizontal). Remove the cover to gain access to the
zeroand span adjustment potentiometers.
Zero adjustment
uDepending on the model, set the zero adjustment to: 0.00V, 4.00 mA or 12.00 mA.
uSpan adjustment is carried out with the required span pressure applied to the +
uDepending on the model, set the span adjustment to: 5.00V, 10.00V 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:......................................................................0to±0.2inH2O-0to±150 psid
Pressure media:
Allfluids, gases and vaporscompatible with anodizedAU4G,beryllium copper, tin and
brazing solder and Loctite Master Joint 510
Accuracy:............................................................................................................ ±0.25%FSBSL
(includinglinearity, hysteresis and repeatability)
Long term stability:............................................................................±0.3%over12months
Weight(approximate)...........................................................................................................2.1lbs
Dimensions......................................................................................................................seebelow
Electrical Specification
Powersupply
LPX5000.............................................10to 30V d.c.
LPM5000............................................18 to 30Vd.c.
LPM5000(±5Vd.c. output)............±12V d.c.
Dimensions
Adjustments
RETURNREQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORERETURNING ANYPRODUCT(S) TOOMEGA,PURCHASERMUSTOBTAINAN AUTHORIZED
RETURN(AR)NUMBERFROMOMEGA’SCUSTOMERSERVICEDEPARTMENT(INORDERTOAVOID
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
OTHERWARRANTIESORREPRESENTATIONS OFANY KINDWHATSOEVER,EXPRESS OR
IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WAR-
RANTYOFMERCHANTABILITY AND FITNESSFOR A PARTICULARPURPOSEARE 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 of OMEGA
ENGINEERING, INC.
G1/8 F via
welded
adapter

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 0.4" into the sensor body.
The installed position of the sensor should be away from sudden temperature
variations,shocksand 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
(lessthan 2.0 inH2O) the recommendedmounting is horizontal.
zero adjustment
(fine)
zero adjustment
(coarse)
span adjustment
filter time response
selector switch
terminal connector
block
square root output
selection switch
(optional)
gland nut
(cable entry) pressure connector
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
PX548 Series (current output)
Themaximum allowable load resistance is
calculated to formula:
R Max = 0.05 (V supply - 10) kW
Where: R Max in kW andV inVolts
PX548 Series (Unidirectional voltage output)
Minimumload 2 k W
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.
PX548 Series bidirectional operation using bipolar
power supply (±12 Vdc) with bidirectional output
(0±5 Vdc or 0±2.5 Vdc)
Minimumload 1 k W
Pressure connections
Thehighpressureconnectorismarked + andthelowpressureconnector ismarked –.
Purgingor de-gasing the sensor
Two 5 mm hexagonal socket bleed screws are located on the outer casing and can be
loosened to bleed the two pressure connectors. Make sure that these screws are
tightenedafter this operation.
Note: It is possible to changeover the bleed screws and pressure connectors
enablingeasier access or permitting installationin a difficult position.
Square root output option
This option only applies to the LPX 5000 sensor with 4 to 20 mA two wire connection
and the square root electronics assembly fitted. A switch next to the terminal block
selectsthe output mode. Switch Output mode
OFF Linear
ON Squareroot
Internal detail
Filter response time
The filter response time of the sensor, additional to the built-in response time of 10
milliseconds (approximately), can be set using the three switches next to the
terminalconnector. Using combinations of the switchescansetdifferenttimes.
Note: Ahollow point isvisible when a switch is in the'on' position.
Example:
Switch A+B = 600 milliseconds
Switch Filter response time
A 200milliseconds
B 400milliseconds
C 1 second
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.