Omega PX157 Series Owner Manual

LE OMEGA
An OMEGA Technologies Company
PX157 Series
Wet or Dry Differential Pressure Transmitter
Operator*s
Manual
M1997/1294
Unpacking Instructions
Remove the Packing List and verify that you
have received all equipment, including the
following (quantities in parentheses):
PX157 Transmitter (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. Immediately report any damage to the
shipping agent. |
The carrier will not honor 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.
Description
The OMEGA” PX157 Pressure Transmitter uti-
lizes a solid-state piezoresistive sensing element
Which is electro-statically bonded to a glass
pedestal which avoids effects of induced stress
and vibration. The sensing element has a com-
puter-controlled laser-trimmed custom hybrid
circuit.
The laser trimming standardizes output and pro-
vides precise temperature and pressure compen-
sation of the sensing element over a range of -25°
to 75°C. The laser trimming allows the PX157
transmitter to be used in temperature range of 0°
to 50°C when mounting the sensing element
remote from the signal conditioning electronics.
CJIS1294JEK2B
Pressure sensing wetted surface is 316 stainless
steel. Pressure port fittings are also available in
316 stainless steel allowing for expanded media
compatibility.
The low level output voltage of the sensing ele-
ment is amplified, temperature compensated and
conditioned to supply current or dc voltage ana-
log signal outputs, which are linear with the
specified pressure span, with the micro-processor
compatibility.
Zero and span thermal effects are maintained at
minimum values over typical industrial operat-
ing temperature ambients.
Applications
The PX157 transmitters provide an accurate, reli-
able means for monitoring differential pressures
in HVAC automation, pneumatic systems and
process control. The output can be easily inter-
faced with chart recorders, data loggers, and
computerized monitoring and control systems.
Applications include:
° Liquid flow rates across an orifice plate
or venturi
° Differential liquid level head pressure
° Pressure difference between two
gaseous or liquid lines
° Variable speed drives controlling chilled
water flow
° Absolute vacuum differential pressure
sensing
o Automotive, industrial monitoring
Features
o Liquids can be applied to both ports
° Zero and Span Adjustments for field
calibration
° Rugged Steel NEMA-4 enclosure
° Available with square root output
i Ht
PX157 Pressure Transmitter
M1997/1294
Available Models
Part Number Range
PX157-005DI О ю 5 PSID
PX157-010DI O to 10 PSID
PX157-01 SDI O to 15 PSID
PX157-015BDI -15 to 15 PSID
PX] 57-030DI O to 30 PSID
PX157-15/45BDI -15to 45 PSID
РХ1 57-0600! О ю 60 PSID
PX157-1000D1 0 to 100 PSID
PX157-150DI 0 to 150 PSID
PX157-200DI O to 200 PSID
PX157-300DI 0 to 300 PSID
PX157-SOODI O to 500 PSID
PX157-750DI O to 750 PSID
PX157-1KDI O to 1000 PSID
Installation
Wiring
Figure 1 shows the location of the three
terminals inside the transmitter and the location
of the High and Low port connections.
Span Potentiometer
— Zero Potentiometer
00) 213)
High and Low
Port Connection
on Small Printed
Circuit Board
Figure 1.
Terminal Locations and Potentiometers Locations
The PX157 transmitter can be wired in two dif-
ferent configurations:
+ 24Vdc power,
4-20mA, 2-wire loop signal or
e 4-20mÀ, 2-wire, field conversion to
1-5Vdc signal.
If wiring to 24Vdc use the following hookup:
DD +24Vdc
© 4-20mA signal out
© No connection
If wiring to 4-20mA, with field conversion to
1-5Vdc signal, use the following hookup:
® +24V de
© [-5Vdc
3 25002
(€) —— = x
Signal Common
Media Compatibility
Liquids and gases compatible with brass and
17-4 PH stainless steel
Pressure Sensing
Gauge (Positive) Pressure Sensing:
Connect media pressure to port labeled
“HIGH”, with port labeled “LOW” vented to
atmosphere.
Vacuum (Negative) Pressure Sensing:
Connect media pressure to port labeled “LOW”,
with port labeled “HIGH” vented to atmos-
phere.
Differential Pressure Sensing:
Connect the higher of the two media pressures
to port labeled “HIGH” and the lower of the two
pressures to port labeled “LOW”.
Port Connection
1/8” NPT female. Itis always recommended to
use a second wrench to hold the port hex nut
thereby eliminating the possibility of rotating
the port fitting.
Mounting
The transmitter can be operating in any position;
however, be alert to moisture passing through
non-waterproof electrical connectors.
Calibration
The zero and span potentiometers may be
adjusted if necessary or desired; however, the
requested full scale range as shipped is
established with fixed resistors minimizing the
range of the adjustment potentiometers.
The average full scale adjustability is approxi-
mately +10% of the range shipped.
Adjustments
The transducers are adjusted for the specified
range at the factory and should require no
further adjustments.
“Z" - zero control is adjusted for 4-20mA output
(or 1 volt) signal at 0 PSI, or minimum
pressure.
“S” - span control is adjusted to change the full
scale range of the transmitter.
Due to resistor values required to compensate
for the null offset of the sensing module,
evidence of zero and span interaction may be
experienced in re-adjusting.
PX157 Pressure Transmitter
M1997/1294
Specifications
Proof Pressure:
(max. over-pressure)
Burst Pressure:
Temperature Range
Sensing Module:
Operating:
Compensated:
Transmitter:
Accuracy
{Includes Repeatability,
Linearity and Hysteresis)
Thermal Stability
Zero:
Span:
Response Time:
(to filter 60 cycle pickup)
Humidity Effects:
Shock:
Vibration:
30 PSI or 2x FS
(whichever is greater)
3x FS
-55° to 110°C {-67° to 230°F)
-25° to 75°C (-13° to 167°F)
0° to 50°C (32° to 122°F)
+0.75% FS
+0.25% FS (optional)
+0.02%/°C
+0.02%/°C
100 milliseconds
5 to 99% non-compensating
50g, 11 sec., half sine
0 to 2 kHz, 20g sine wave
1-1/4
A
Figure 2. Dimensions
Media Compatibility: liquids or gases compatible
with brass and 17-4PH stainless
steel
Stability | year: +0.3% span/ year
(with existing zero/span
potentiometers)
Current/ Resistance Data:
(2-wire loop -
max. loop resistance): 400 ohms @ 18V;
700 ohms @ 24V
1000 ohms @ 30V
Quiescent current draw = output current
(4-wire]: output sources: 20mA
Quiescent draw = 30mA @ 24V
Excitation: 24Ydc (2-wire) unregulated
Output: 4-20mA
Zero and Span Adjustment: +10%
Gasketed steel epoxy painted
with NEMA-4 rating
Enclosure:
Pressure Port: 1/8 NPTF
Weight: 3.5 lbs (1.58 kg)
Dimensions: See Figure 2
Мочп!!пф Overall
5/16 Dia., 4 holes
Center Line Dim.
Box Size
(AxBxC)
Gauge
Dimensions
Length/ Width
16 6"x4"x3" 6-3/4" x 2" 7-1/2" x 4-15/16" 2-3/8"
LE OMEGA
Am OMEGA Techunolagies Company
Servicing USA and Canada: Call OMEGA Toll Free
USA
One Omega Drive, Box 4047
Stamford, CT 06907-0047
Telephone: (203) 359-1660
FAX: (203) 359-7700
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976 Bergar
Laval (Quebec) H7L 5A1
Telephone: (514) 856-6928
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Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA™
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Servicing Europe: United Kingdom Sales and Distribution Center
25 Swannington Road, Broughton Astley, Leicestershire
LE9 6TU, England
Telephone: 44 (1455) 285520 FAX: 44 (1455) 283912
USA, : 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 one
(1) month grace period to the normal one (1) year product warranty to cover handling and ship-
ping 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 writ-
ten 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 result of excessive corrosion; or
current, heat, moisture or vibration; improper specification; misapplication; misuse or other operat-
ing conditions 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 WHAT-
SOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE AND ALL IMPLIED WAR-
RANTIES INCLUDING ANY WARRANTY 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, war-
ranty, 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.
Every precaution for accuracy has been taken in the preparation of this 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.
SPECIAL CONDITION: Should this equipment be used in or with any nuclear installation or activity,
purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatso-
ever arising out of the use of the equipment in such a manner.
RETURN REQUESTS / INQUIRIES
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 return package and on any correspondence.
FOR WARRANTY RETURNS, please have the | FOR NON-WARRANTY REPAIRS OR CALIBRA-
following information available BEFORE con- | TION, consult OMEGA for current repair/
tacting OMEGA: calibration charges. Have the following infor-
1. PO. number under which the product was mation available BEFORE contacting OMEGA:
PURCHASED, 1. PO. number to cover the COST of the
2. Model and serial number of the product repair/calibration,
under warranty, and 2. Model and serial number of product, and
3. Repair instructions and/or specific prob- 3. Repair instructions and/or specific problems
lems relative to the product. relative to the product.
OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1994 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without prior
written consent of OMEGA ENGINEERING, INC.