OE OMEGA
An OMEGA Technologies Company
PX945 SERIES
Industrial Transmitter
with Laboratory Accuracy
M1518/0692
WIRING DIAGRAM
POWER SUPPLY PX945
— | + RED
||| | 1
|| ?
— + BLACK
METER
(1) RED +SUPPLY
(2) BLACK + OUTPUT
(4) WHITE CASE GROUND
WIRING DIN CONNECTOR
WARNING!
READ BEFORE INSTALLATION
Fluid hammer and surges can destroy any pressure transducer and must
always be avoided. À pressure snubber should be installed to eliminate the
damaging hammer effects.
Fluid hammer occurs when a liquid flow is suddenly stopped, as with quick
closing solenoid valves. Surges occur when flow is suddenly begun, as
when a pump is turned on at full power or a valve is quickly opened.
Liquid surges are particularly damaging to pressure transducers if the pipe is
originally empty. To avoid damaging surges, fluid lines should remain full (if
possible), pumps should be brought up to power slowly, and valves opened
slowly. To avoid damage from both fluid hammer and surges, a surge
chamber should be installed, and a pressure snubber should be installed on
every transducer.
Symptoms of fluid hammer and surge's damaging effects:
a) Pressure transducer exhibits an output at zero pressure (large zero
offset). If zero offset is less than 10% FS, user can usually re-zero meter,
install proper snubber and continue monitoring pressures.
b) Pressure transducer output remains constant regardiess of pressure.
c) In severe cases there will be no output.
To access the terminals inside the DIN connector, proceed as follows:
1. Remove the screw at the top of the connector.
2. Separate the DIN connector from the transducer.
3. Insert a small blade screwdriver in the slot provided and pry the DIN connector apart.
4. After wiring the terminals, snap the DIN connector back together.
5. Mount the DIN connector to the transducer (using rubber gasket between), observing
the blade orientation.
6. Finish by securing the screw back into top of DIN connector.
OPTIONAL SOLDERLESS MATING
ELECTRICAL CONNECTOR CONNECTOR w/GASKET
1/4 -18 NPT FEMALE DIN 43650/GSA 300 N SPECIFY CABLE SIZE OR 1/2 NPT
PRESSURE PORT wr1" HEX or EQUIVALENT CONDUIT FITTING
(Adapters used for male
fittings)
1.50" O |
DIA. _
3.90" (50-1500 PSI)
3.15" (2K-10K PSI) REMOVABLE SCREWS TO
CONNECTOR WIRING ACCESS ZERO & SPAN
PIN FUNCTION ADJUSTMENTS INSIDE CASE
+ SUPPLY (15-40 VDC) CONN. GASKET
2 + OUTPUT (4-20 MA) DIN 43650/GSA 200-4
я N/C or EQUIVALENT
CASE GROUND
SPECIFICATIONS
NIST traceable calibration, full scale output given
0.1%FS (including linearity, hysteresis, and repeatability)
EXCITATION: 15 to 40 Vdc
OUTPUT: 4-20 mA (2-wire)
ACCURACY:
ZERO BALANCE: 4 +0.015 mA
OPERATING TEMPERATURE:
COMPENSATED TEMPERATURE:
0 to 185°F (-18 to 85°C)
30 to 130°F (0 to 55°C)
THERMAL EFFECTS
Zero: 0.15% FS/F
Span: 0.15% rdg” F
PROOF PRESSURE: 150% FS
BURST PRESSURE: 200% FS
MAX. LOOP RESISTANCE: (supply voltage -15) x 50 ohms
RESPONSE TIME: 2500 Hz
GAGE TYPE: Bonded foil
ZERO 4 SPAN: 15% adj.
PRESSURE PORT: 1/4-18 NPTF
ELECTRICAL CONNECTION:
DIN connector screw terminalis (supplied with 3 ft., 29 AWG,
2 cond. shielded, pigtail leads)
DIMENSIONS:
WEIGHT: 13 oz. (365 g)
1-1/2" dia. x 5-5/16" L (38 x 150mm)
Ma WARRANTY
OMEGA warrants this unit to be free of defects in materials and workmanship and to give
satisfactory service for a period of 13 months from date of purchase. OMEGA Warranty adds an
additional ons {1} month grace period to the normal one [1) year product warranty to cover
handling and shipping time. This ensures that our customars receive maximum coverage on
each product. Ifthe unit should malfunction, it must be returned to the factory for evaluation. Our
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. However, this WARRANTY ie VOID if the unit shows
evidence of having been tampered with or shows svidence of being damaged as a result of
excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplica-
tion; misuse or other operating conditions outside of OMEGA's control. Components which wear
or which are damaged by misuse are not warranted. These include contact points, fusas, and triacs.
We are glad te offer suggestions en the use of swr various preducts. Nevertheless OMEGA
only warrants thet the parts manufeetured by it will be as specified and free of defects.
OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND
WHATSOEVER, EXPRESSED OR MMPLIED, EXCEPT THAT OF TITLE AND ALL IMPLIED
WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.
LIMITATION OF LIABILITY: The remedies of buyer set ferth herein are exclusive and the
total lishility of OMEGA with respest te this order, whether based en sentract, -
waranty, negligenee, indemnification, strict liability or etherwise, shall not exceed
the purchase prises of the component upen whioh liability is based. In ne event shall
OMEGA be liable for sensequential, incidental or special damages.
Every precaution for accuracy has been taken in the preparation ofthis manual, however, OMEGA
ENGINEERING, INC. neither assumes responsibility for any omissions or errors that may appear
nor assumes liability for any damages that result from the use of the products in accordance with
the information contained in the manual.
OMEGA's policy is to make running changes, not model changes, whenever an improvement
ls possible. That way our customers get the latest In technology and engineering.
OMEGA la a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1992 OMEGA ENGINEERING, INC. All rights reserved Including illustrations.
Nothing in this manual may be reproduced in any manner, either wholly or in part for any
purpose whatsoever without written permission from OMEGA ENGINEERING, INC.
Printed In U.S.A
Servicing USA and Canada: Call OMEGA Toll Free
OMEGA Engineering, Inc.
One Omega Drive, Box 4047
Stamford, CT 06907-0047 U.S.A.
Headquarters: (203) 359-1660
Sales: 1-800-826-6342 / 1-800-TC-OMEGA
Customer Service: 1-800-622-2378 / 1-800-622-BEST
Engineering: 1-800-872-9436 / 1-800-USA-WHEN
FAX: (203) 359-7700 TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Servicing Europe: United Kingdom Sales and Distribution Center
OMEGA Technologies Ltd.
P.O. Box 1, Broughton Astley, Leicestershire
LEY 6XR, England
Telephone: (0455) 285520 FAX: (0455) 283912
ads RETURN REQUESTS / INQUIRIES iii sine
Direct all warranty and repair requesta/inquiries to OMEGA's Customer Service Department.
Call toll free In the USA and Canada: 1-800-622-2378, FAX: 203-359-7811; International: 203-
353-1660, FAX: 203-359-7807.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, YOU MUST OBTAIN AN AUTHORIZED
BETURN {AR} NUMBER FROM OUR CUSTOMER SERVICE DEPARTMENT (IN ORDER TO
AVOID PROCESSING DELAYS). The assigned AR number shouid then be marked on the
outside of the return package and on any correspondence.
FOR WARRANTY RETURNS, please have the| FORNON-WARBANTY REPAIRS ORCALIBRA-
following Information avallable BEFORE con-| TION consult OMEGA for current repalr/cali-
tacting OMEGA: bration charges. Have the following informa-
tion available BEFORE contacting OMEGA:
1. P.O. number under which the product
was PURCHASED, 1. Your P.O. number to cover the COST ofthe
2. Model and serial number of the product repair/calibration,
under warranty, and 2. Model and serial number of the product,
3. Repair instructions and/or apecific prob-
3. Repair instructions and/or specific prob-
lema you are having with the product.
lems you are having with the product.
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