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

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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.

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