LE OMEGA
An OMEGA Technologies Company
PX821 Series
Wet/Wet Differential Pressure Transducer
Operator's
Manual
M2033/1294
Unpacking Instructions
AA AA
Remove the Packing List and verify that you have
received all equipment, including the following
(quantities in parentheses):
PX821 Transducer (1)
Operator's Manual (1)
If you have any questions about the shipment, please
call the OMEGA Customer Service Department.
When you receive the shipment, inspect the container
and equipment for signs of damage. Note any evidence
of rough handling in transit. Inmediately report any
damage to the shipping agent.
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The carrier will not honor any damage claims unless
all shipping material is saved for inspection. After
examining and removing contents, save packing
material and carton in the event reshipment is
necessary.
General Description
The OMEGA? PX821 Series Differential Pressure
Transducer is a high accuracy, lightweight, wet/wet
differential pressure transducer. For compatibility with
a number of liquid and gaseous media, both the
positive and negative pressure ports are manufactured
from Hastelloy C276 and 316L stainless steel. In
addition, its rugged, all welded construction assures
excellent resistance to shock, vibration, and overload.
Available Models
10DV
PX821-015DV
1
1-
PX821-900DV
NLR1294RAF1B
BEL
READ BEFORE INSTALLATION
Fluid hammer and surges can destroy any pressure
transducer and must always be avoided. A 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:
1. 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.
2. Pressure transducer output remains constant
regardless of pressure.
3. In severe cases, there will be no output.
Electrical Connections
Red + Excitation
White Excitation
Yellow + Output
Blue - Output
Shield N/C to transducer body
PX821 Series Differential Pressure Transducer M2033/1294
Dimensions Specifications (continued)
Temperature Range: -20 to 80°C
(-5 10175°F)
Temperature Effects: +1.5% FS total error band
from -5 to 175°F |
Max. Static Pressure: — 1000 PSI
Specifications
10 VDC regulated
50 millivolts for 5 PSI range
Excitation:
Output:
Overpressure:
The operating pressure range can be exceeded by the
following multiples causing negligible calibration change:
Positive Connection: — 6X for 5 PSI range, 4X for 10 PSI
and above to 2000 PSI max.
Negative Connection: 4X for 5 PSI range, 2X for
10-75 PSI ranges, 150 PSI max.
for higher ranges.
Vibration Effects: Less than 0.05% FS/g E 30 g
10 Hz to 2 kHz
Wetted Parts: 316L SS and Hastelloy C276
Pressure Connections: 1/4" - 18 NPTM
Electrical Connection: — 3 ft. shielded cable
100 millivolts for all other ranges Weight: 7.7 oz. (218 grams)
Output Impedance: 1000 ohms nominal
load Impedance: ~~ >100K ohms for rated performance
Accuracy: +0.1% BFSL (combined linearity
hysteresis and repeatability)
Zero Offset: +3 mV maximum
LE OMEGA
WARRANTY mun ... TT
free of defects in materials and workmanship and Servicing USA and Canada: Call OMEGA Toll Free
to give satisfactory service for a period of 13 months from date of purchase. USA Canada
OMEGA 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 should
malfunction, 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. However, this WARRANTY is
VOID if the unit shows evidence of having been tampered with or shows evidence of
being damaged as a resuit of excessive corrosion: or current, heat, moisture or
vibration; improper specification; misapplication; misuse or other operating condi-
tions outside of OMEGA's control. Components which wear or which are damaged
by misuse are not warranted. These include contact points, fuses, and triacs.
OMEGA is glad to offer suggestions on the use of its various products.
Nevertheless, OMEGA only warrants 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, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MER-
Cr ANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are
exclusive and the total liability of OMEGA with respect to this order,
based on contract, warranty, negligence, indemnification, strict
liability or otherwise, shail not exceed the purchase price of the compo-
nent upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
Every precaution for accuracy has been taken in the preparation of this manual:
however, OMEGA ENGINEERING, INC. neither assumes responsibility for any omis-
sions 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.
SPECIAL CONDITION: Should this equipment be used in or with any nuclear instal-
lation or activity, purchaser will indemnify OMEGA and hold OMEGA harmless from
any liability or damage whatsoever arising out of the use of the equipment in such a
manner.
One Omega Drive, Box 4047 976 Bergar
Stamford, CT 06907-0047 Laval (Quebec) H7L SA1
Telephone: (203) 359-1660 Telephone: (514) 856-6928
FAX: (203) 359-7700 FAX: (514) 856-6886
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
Servicing Europe: United Kingdom Sales and Distribution Center
25 Swannington Road, Broughton Astley, Leicestershire
LE9 6TU, En
Telephone: 44 (1455) 285520 FAX: 44 (1455) 283912
ru RETURN REQUESTS / INQUIRIES SEEN
Direct all warranty and repair requests/inquiries to the OMEGA ENGINEERING 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 retum package and on any corre-
spondence.
FOR WARRANTY RETURNS, please have FOR NON-WARRANTY REPAIRS OR CAL-
the following information available IERATION, consult OMEGA for current
BEFORE contacting OMEGA: repair/calibration charges. Have the fol-
1. P.O. number under which the product lowing information available BEFORE
was PURCHASED, contacting OMEGA:
1.
2. Model and serial number of the P.O. number to cover the COST of the
roduct under warranty, and repair/calibration,
3. Repair instructions and/or specific 2. Model and serial number of product,
problems relative to 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. ,
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medium or machine-readable fom Shroduce or in part, without prior written consent of
OMEGA ENGINEERING, INC.
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