User’s Guide
PX548
Wet/Wet Differential
Pressure Sensor
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Ad ju s t m e n t s
WARRANTY/DISCLAIMER
The following equipm ent is required to carry out the adjustm ents:
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
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.
r
r
r
r
Power supply
Voltm eter or
Milli-am m eter
Pressure standard
uConnect the sensor as shown in Installation. The sensor should be put in its norm al
operating position (vertical or horizontal). Rem ove the cover to gain access to the
zero and span adjustm ent potentiom eters.
Ze ro a d ju s t m e n t
uDepending on the m odel, set the zero adjustm ent to: 0.00 V, 4.00 m A or 12.00 m A.
uSpan adjustm ent is carried out with the required span pressure applied to the +
uDepending on the m odel, set the span adjustm ent to: 5.00 V, 10.00 V or 20.00 m A.
uRelease the pressure.
Co m p le t io n
Check the output at zero pressure and if necessary, repeat the zero and span
adjustm ents.
r
Release the pressure and disconnect the equipm ent.
r
Refit the cover.
S p e c ific a t io n
Pre ssu re ra n g e :......................................................................0 to ±0.2 inH2O - 0 to ±150 psid
P re s s u re m e d ia :
All fluids, gases and vapors com patible with anodized AU4G, beryllium copper, tin and
brazing solder and Loctite Master Joint 510
Accuracy:............................................................................................................ ±0.25% FS BSL
(including linearity, hysteresis and repeatability)
Long term stability:............................................................................±0.3% over 12 months
Weight (approximate)...........................................................................................................2.1lbs
Dimensions......................................................................................................................see below
Ele c t ric a l S p e c ific a t io n
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.
Power supply
RETURN REQUESTS/INQUIRIES
LPX 5000.............................................10 to 30V d.c.
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 OMEGA’S 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.
LPM 5000............................................18 to 30V d.c.
LPM 5000 (±5V d.c. output)............±12V d.c.
FOR WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which the
product was PURCHASED,
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.
2. Model and serial number of the product under
warranty, 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.
Dim e n s io n s
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In s t a lla t io n
P X5 4 8 S e rie s (Un id ire c t io n a l vo lt a g e o u t p u t )
CAUTION:
1. INCORRECT ELECTRICAL CONNECTIONS CAN, IN CERTAIN CIRCUMSTANCES , DESTROY THE
ELECTRONIC OUTPUT CIRCUIT.
2 . BEFORE AP P LYING ELECTRICAL P OWER, MAKE SURE THE S UP P LY VOLTAGE IS TO THE CORRECT
RATING.
Minim um load 2 kW
3 . THIS A VERY S ENS ITIVE S ENS OR, ONLY AP P LY P RES S URE WITHIN THE P RES S URE RANGE.
Mo u n t in g
No t e : Connections 5 and 6 are com m on
Two M5 threaded holes in the base of the sensor provide m ounting points.
No t e : The screws m ust not enter the holes m ore than 0.4" into the sensor body.
The installed position of the sensor should be away from sudden tem perature
variations, shocks and vibrations and should not be close to strong electrom agnetic
fields (transform ers, m otors etc.). The sensor can be m ounted in any position, but
m ounting at an angle m ay require zero adjustm ent. For very low pressure sensors
(less than 2.0 inH2O) the recom m ended m ounting is horizontal.
If the output cable passes through an area of electrical disturbance, use a
recom m ended load im pedance of between 2 kW and 10 kW . Connect the load
resistance between the wires corresponding to signal and - term inal at a point
furthest from the sensor.
P X5 4 8 S e rie s b id ire c t io n a l o p e ra t io n u s in g b ip o la r
p ow e r s u p p ly (±12 Vd c ) w it h b id ire c t io n a l o u t p u t
(0 ±5 Vd c o r 0 ±2 .5 Vd c )
zero adjustment
span adjustment
(fine)
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.
zero adjustment
(coarse)
filter time response
selector switch
square root output
selection switch
(optional)
terminal connector
block
Minim um load 1 kW
P re s s u re c o n n e c t io n s
The high pressure connector is marked
+
and the low pressure connector is marked –.
gland nut
(cable entry)
pressure connector
Purging or de-gasing the sensor
Two 5 m m 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
tightened after this operation.
No t e : It is possible to changeover the bleed screws and pressure connectors
enabling easier access or perm itting installation in a difficult position.
In t e rn a l d e t a il
Ele c t ro m a g n e t ic In t e rfe re n c e
S q u a re ro o t o u t p u t o p t io n
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
term inal screw.
This option only applies to the LPX 5000 sensor with 4 to 20 m A two wire connection
and the square root electronics assem bly fitted. A switch next to the term inal block
selects the output m ode.
Sw itch
Output m ode
Ele c t ric a l c o n n e c t io n s
OFF
ON
Linear
Square root
PX548 Series (current output)
Filt e r re s p o n s e t im e
The filter response tim e of the sensor, additional to the built-in response tim e of 10
m illiseconds (approxim ately), can be set using the three switches next to the
term inal connector. Using com binations of the switches can set different tim es.
The m axim um allowable load resistance is
calculated to form ula:
R Max = 0.05 (V supply - 10) kW
Where: R Max in kW and V in Volts
Sw it ch
Filt e r re s p o n s e t im e
A
200 m illiseconds
Example:
Switch A+B = 600 milliseconds
B
C
400 m illiseconds
1 second
No t e : A hollow point is visible when a switch is in the 'on' position.
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