Omega Vehicle Security Stud Sensor PX548

Users Guide  
PX548  
Wet/Wet Differential  
Pressure Sensor  
w w w .o m e g a .c o m  
e -m a il: in fo @o m e g a .c o m  
 
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
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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  
 
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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