Omega Products PX138-001D5V Installation Manual

General Description

The OMEGA®PX138 Series uses state-of-the-art micro-machined silicon
pressure sensors in conjunction with stress-free packaging techniques to
provide highly accurate, temperature-compensated pressure transducers for
the most demanding applications. When operated from an 8 Vdc regulated
power source, they provide a 1 to 6 Vdc output. Other regulated voltages
from 7 to 16 volts can be used, but the output will change in proportion to the
excitation.

PX138 pressure transducers are available in absolute and differential models.
Differential models can also be used to measure gage pressure or vacuum by
simply varying the pressure connections. To measure gage pressure, make the
pressure connection to port B and leave port A open to the atmosphere. For
vacuum measurement, connect to port A and leave port B open. When using
absolute models, connect to port A.

Available Models

Differential

Pressure Ranges Model

±0 to 0.3 psi PX138-0.3D5V
±0 to 1 psi PX138-001D5V
±0 to 5 psi PX138-005D5V
±0 to 15 psi PX138-015D5V
±0 to 30 psi PX138-030D5V
±0 to 100 psi PX138-100D5V

Absolute

Pressure Ranges Model

0 to 15 psia PX138-015A5V
0 to 30 psia PX138-030A5V
0 to 100 psia PX138-100A5V

PX138 Pinouts

1 = + Excitation (Black dot is next to pin 1)
2 = Common
3 = + Signal
4 = No Connection

PX138 Series

Pressure Sensors

1

INSTRUCTION

SHEET

M2002/1008

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NOTE

WARNING

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
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 should be opened slowly. To avoid damage from both fluid
hammer and surges, a surge chamber 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.

PX138 Series Pressure Sensors

Unpacking

Remove the Packing List and verify that you have received all equipment,
including the following:

PX138 Series Pressure Sensor
Operator’s Manual

If you have any questions about the shipment, please call the OMEGA
Customer Service Department at:

1-800-622-2378 or 203-359-1660. We can also be reached on the Internet at
omega.com e-mail: [e-mail]

When you receive the shipment, inspect the container and equipment for any
signs of damage. Note any evidence of rough handling in transit.
Immediately report any damage to the shipping agent.

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.

2

Dimensions

Specifications

Excitation Voltage: 8 Vdc (7 to 16 limits)

Output: 1 to 6 V (@ 8 V excitation)

Linearity and Hysteresis: ±0.1% FS typical, 0.5% max.

(0.5% typ., 1% max. for 0.3 psi range)

Repeatability: ±0.1% FS typical, 0.3% max.

Zero Balance Diff: 3.5 Vdc ±0.05 Vdc (@ 8 V excitation)

Abs: 1 Vdc ±0.05 Vdc (@ 8 V excitation)

Storage Temperature: -40 to 125°C (-40 to 257°F)

Compensated Temp. Range: 0 to 50°C (32 to 122°F)

Zero Temp. Effects: ±0.5% FS (±1% FS for 0.3 psi)

Span Temp. Effects: ±0.5% FS (±1% FS for 0.3 psi)

Proof Pressure: >3X FS pressure

Burst Pressure: >5X FS pressure

Common Mode Pressure: 50 psi

Media Compatibility: For use with clean, dry, non-corrosive gases

PX138 Series Pressure Sensors

1. + Excitation

2. Common

3. + Signal

4. No Connection

3

6.4

(0.25)

0.356 x 0.508

(0.014 x 0.020)

4 PLACES FOR
ELECTRICAL CONNECTION

DIMENSIONS: mm (in)

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing
certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

WARRANTY/DISCLAIMER

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 in which wear is not warranted,
include but are 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 the
company 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 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.

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.

RETURN REQUESTS / INQUIRIES

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.

FOR WARRANTY

RETURNS, please have the following informa-

tion available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was
PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the
product.

FOR NON-WARRANTY REPAIRS,

consult OMEGA for cur­rent repair charges. Have the following information avail­able BEFORE contacting 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.

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 2008 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.

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