General Description
The OMEGA®PX139 Series Pressure Transducer uses state-of the-art
micromachined silicon pressure sensors in conjunction with stress-free
packaging techniques to provide highly accurate, temperature-compensated
pressure transducers for the most demanding applications. Designed to
operate from a regulated 5 volt DC power source, the PX139 provides a
calibrated 4 volt output span of 0.25 to 4.25 volts.
PX139 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
Gage/Differential
Pressure Ranges Model
±0.3 PSI PX139-0.3D4V
±1 PSI PX139-001D4V
±5 PSI PX139-005D4V
±15 PSI PX139-015D4V
±30 PSI PX139-030D4V
Absolute
Pressure Ranges Model
0 to 15 PSIA PX139-015A4V
0 to 30 PSIA PX139-030A4V
PX139 Pinouts
1 = + Excitation
2 = Common
3 = + Signal
4 = No Connection
PX139 Series
Pressure Sensors
INSTRUCTION
SHEET
M2003/0208
Shop online at: omega.com e-mail: info@omega.com
For latest product manuals: omegamanual.info
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.
PX139 Series Pressure Sensors
Unpacking
Remove the Packing List and verify that you have received all equipment,
including the following:
PX139 Series Pressure Sensor
Operator’s Manual
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
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.
NOTE
WARNING
Dimensions
Specifications
Excitation Voltage: 5 Vdc
Output: 0.25 to 4.25 volts
Linearity and Hysteresis: ±0.1% FS typical, 0.5% max.
(0.5% typ., 1% max. for 0.3 PSI range)
Repeatability: ±0.3% FS
Zero Balance: 0.25 Vdc ±0.05 Vdc
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: > 3 X FS Pressure
Burst Pressure: > 5 X FS Pressure
Common Mode
Pressure: 50 PSI
Media Compatibility: For use with gases compatible with silicon,
glass-filled nylon, and alumina ceramic
PX139 Series Pressure Sensors
PINOUT:
1. + Excitation
2. Common
3. + Signal
4. No Connection