Omega Products PX700 Installation Manual

PX700 SERIES

Pressure Transducer

INSTRUCTION

SHEET

M0585/0305

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General Description

The OMEGA®PX700 Series Pressure Transducers have been specifically
designed for use in harsh, demanding industrial environments. Their
NEMA-4 rated enclosure and corrosive resistant construction makes the
PX700 Series ideal for use both indoors and out. The PX700 Series offers
pressure ranges from 0-15 psig to 0-10k psig, and two differerent output
types - volt and current. The PX700 is available with a 0.5 to 5.5 V or 1 to 11
V output, or a 4 to 20 mA output. All models have adjustable zero and span.

Outline Dimensions

Terminal Connections

V Models: I Models

1 (+) Excitation 1 Excitation*
2 (+) Output 2 Excitation*
3 Common 3 Not Used
4 Not used 4 Not Used
* Polarity is not dedicated - either terminal can be positive (+) or negative (–).

WARNING! READ BEFORE INSTALLATION

Fluid hammer and surges can destroy any pressure transducer and must always be avoided. A pressure
snubber should be irstalled 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:
a) 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.
b) Pressure transducer output remains constant regardless of pressure.
c) In severe cases, there will be no output.

DIMENSIONS
IN INCHES

NULL AND SPAN ADJUSTMENTS (Voltage and Current Models Only)

The PX700 Pressure Sensors have been factory calibrated to give the rated
output and no adjustment should be necessary. However, if so desired,
small residual offsets can be corrected on the voltage and currrent models
by the following procedure:

1. Connect unit as per terminal plate.

2. With zero pressure applied to the transmitter pressure port, adjust NULL
ADJ trimpot for rated output at zero pressure.

To allow precise calibration the trimpots are multiturn types.

3. Apply a known accurate pressure to the transmitter pressure port.
Ideally, this pressure should be the full range pressure of the transmitter;
however, it is acceptable to use an intermediate value. Adjust the SPAN
ADJ for the rated output at the applied pressure.

4. Because of a small interaction between the SPAN ADJ and the NULL ADJ
trimpots. repeat steps 2 ad 3 as required.

MIINIMUM ADJUSTMENT RANGE

VOLTAGE MODELS CURRENT MODELS

0.5 to 5.5V 1 to 11V 4 to 20 mA

Zero 0.2 to 1.3 V 0.4 to 1.3 V 3.6 to 5.0 mA
Span 4.8 to 5.2 V 9.2 to 10.8 V 15 to 17 mA

PX700 SERIES SPECIFICATIONS

EXCITATION: 0.5 to 5.5 Models: 12 to 32 Vdc

1 to 11 V Models: 14 to 32 Vdc
I Models: 12 to 67 Vdc (with appropriate
loop resistance - see chart)

OUTPUT: V Models: 0.5 to 5.5 or 1 to 11 V;

I Models: 4 to 20 mA

PERFORMANCE: 2X full scale or 13,000 psi

PROOF PRESSURE: Whichever is less

ACCURACY: 0.25% full scale at 75% (includes linearity,

hystersis, and repeatability)

ZERO BALANCE: ±2% of full scale

SPAN ACCURACY: ±1% of full scale 75°F

COMPENSATED 30 to 160°F
TEMPERATURE
RANGE:

TOTAL THERMAL EFFECT: 1% of full scale max.

OPERABLE
TEMPERATURE RANGE: 0 to 160°F

NOTE