Omega Products PX106 Installation Manual

General

The Model PX106 is the digital output member of the
PX106 transducer family. The transducer’s output signal
is a frequency modulated square wave with a nominal
5 KHz range, set from 1 KHz to 6 KHz.

The PX106 logic level frequency output signal offers
unique advantages over conventional analog voltage
output transducers. The primary advantage is the ease
with which the transducer can be interfaced to most
microprocessors. Another advantage is superior noise
immunity which allows the PX106 to perform in a variety
of harsh environments without shielded cable or special
care to protect transmission lines. Also, since it is a logic
level signal at relatively low frequency, long
communication lines can be used, and simple wave shape
reconstruction can be performed if required.

The PX106 is designed to meet the needs of today’s high
technology requirements. It is the ideal choice for those
applications that need a rugged, reliable, cost efficient
transducer with the benefits of 0.5% accuracy, long-term
stability and a wide operating temperature range.

A unique stainless steel pressure chamber design insures
circuit protection from corrosive measurand while the
outer case of Valox protects against harsh environments.
This combination assures the Model PX106 performance to
continue within original specification limits. The internal
voltage regulator allows use of economical unregulated
power sources of 10-20 Vdc.

Typical media used with the PX106 include oil, gases,
saline solutions, ammonia, Freon, hydraulic fluids, alcohol,
acids, and gasoline.

Pressure ranges extend from 0-6 psi to 0-5000 psi. Typical
accuracy, including the effects of nonlinearity, hysteresis,
and repeatability, is within 0.5% of span from best fit line.

Installation

The Model PX106 may be easily mounted on a printed
circuit board using the two mounting holes or by
supporting it from the stainless steel pressure port. Many
applications require a threaded pressure port. For these we
recommend the use of threaded adapters and bushings. A
10-20 volt DC power supply is required to energize the
Model PX106. See power connections in diagram.

Maintenance

No maintenance is required with these transducers The
absence of moving parts and the solid-state electronics
make them trouble-free and reliable.

Pressure Overloads

PX106 transducers will withstand high overloads. If the
overload rating is exceeded, electrical failure may occur. As
a safety feature, the transducers have been designed to
withstand much higher burst pressures than the pressure
which will cause permanent damage.

Important: Both static and dynamic overloads must be
considered when selecting a pressure transducer. Pressure
fluctuations exist in most systems. These fluctuations can
have very large and very fast peak pressures, as in water
hammer effects. If the transducer is connected to a slow
responding instrument, such pressure peaks may not be
observed. An oscilloscope is a convenient tool for
determining if high pressure transients exist in a system.
Where pressure pulses are expected, the transducer rating
should be high enough to prevent overload by the peak,
pressure. Where high pressure transients are unavoidable,
use either a higher range transducer or a snubber, which
will reduce the peak pressure applied to the transducer.
The life of the transducer will be reduced if it is repeatedly
overloaded, particularly under dynamic conditions.

WARNING! READ BEFORE INSTALLATION

Fluid hammer and surges can any pressure transducer and must
always be avoided. A pressure snubber should be installed to
eliminate the damaging hammering effects.

Fluid hammer occurs when a liquid flow is suddenly stopped, as
with quick closing solenoid valves. Surges occur when flow is
quickly begun, as when a pump is turned on at full power or a
value 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:

a) Pressure transducers exhibit 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.

b) Pressure transducer output remains constant regardless of

pressure.

c) In severe cases, there will be no output.

PX106

PRESSURE TRANSDUCER

INSTRUCTION

SHEET

M0214-1008

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DIMENSIONS mm (in.)