Omega Products PX71-0.3GV Installation Manual

PX70 Series

Pressure Sensors

INSTRUCTION

SHEET

M2000/1207

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Unpacking

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

PX70 Series Pressure Sensor (1)

Instruction 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 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

OMEGA’s PX70 Series is a piezoresistive pressure sensor in a TO-5 package
suitable for PC board mounting. These devices are available in full scale ranges
from 0.03 to 100 PSI as well as several standard package options. For gage and
absolute ranges, the PX71 is available without fittings, while the PX72 has a top­mounted tube fitting (bottom vent for gage). The PX73 is also available in gage
ranges and has a bottom tube fitting (top vent). For differential measurement,
the PX74 has top and bottom tubes and can be used for uni-directional or bi­directional measurement. All models are operated from a constant current
excitation supply. The PS-KIT-1 provides the necessary components to convert
a constant voltage (9-30 Vdc) to a 1 mA constant current source.

NOTE

PX70 Series Pressure Sensors

Available Models

Read Before Installation

Fluid hammer and surges can destroy any pressure transducers 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.

GAGE AND NO FITTING TOP FITTING BOTTOM DIFFERENTIAL
DIFFERENTIAL FITTING
PRESSURE MODEL NO. MODEL NO. MODEL NO. MODEL NO.
RANGES

0 to 0.3 PSI PX71-0.3GV PX72-0.3GV PX73-0.3GV PX74-0.3DV
0 to 0.8 PSI PX71-0.8GV PX72-0.8GV PX73-0.8GV PX74-0.8DV
0 to 1.5 PSI PX71-1.5GV PX72-1.5GV PX73-1.5GV PX74-1.5DV
0 to 5.0 PSI PXC71-005GV PX72-005GV PX73-005GV PX74-0050V
0 to 15 PSI PX71-015GV PX72-015GV PX73-015GV PX74-015DV
0 to 30 PSI PX71-030GV PX72-030GV PX73-030GV PX74-030DV
0 to 60 PSI PX71-060GV PX72-060GV PX73-OSOGV PX74-060DV
0 to 100 PSI PX71-100GV PX72-IOGGV PX73-IOOGV PX74-IOODV

ABSOLUTE PRESSURE RANGES

0 to 5.0 PSIA PX71-005AV PX72-005AV
0 to 15 PSIA PX71-015AV PX72-015AV
0 to 30 PSIA PX71-030AV PX72-030AV
0 to 60 PSIA PX71-060AV PX72-060AV
0 to 100PSIA PX71-100AV PX72-IOOAV

WARNING