SOR 503FR User Manual

503FR Fixed Range

Instructions

Pressure Transmitter

General Instructions

The 503FR Fixed Range Pressure Transmitter is a loop powered, solid state
instrument designed for accurate and reliable pressure measurement. The
transmitter uses a high-performance ceramic sensor and a stainless steel
process connection for compatibility with many types of process fluids
requiring continuous monitoring.

NOTE: If you suspect that a product is defective, contact the factory or the

®

Representative in your area for a return authorization number (RMA).

SOR
This product should only be installed by trained and competent personnel.

Operation

Once the transmitter is installed and wired into a control or display loop,
it is ready for use. Before applying power, check that the polarity and
excitation voltage are correct.

Calibration

The transmitter is fixed range and supplied factory calibrated. If it is desired to verify
calibration prior to installation, attach the transmitter to a pressure source capable of
adjustment throughout a specified range. If outputs are not within limits at factory

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calibration conditions, 77

F (25oC), the device should be returned to the factory.

Design and specifications are subject to change without notice.

Form 963 (03.13) ©SOR Inc.

For latest revision, go to www.sorinc.com

Registered Quality System to ISO 9001

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Installation

Ensure that wiring conforms to all applicable local and national electrical codes and install
unit(s) according to relevant national and local safety codes.

Before installing the transmitter, verify that the range stated on the transmitter label is
suitable for the pressure to be measured.

The transmitters are designed to be self-supporting in any plane when rigidly mounted by
the pressure port (1/4” NPT process connection). Thread the transmitter in place using the
wrench flats provided.

Avoid mounting the transmitter near a heat source which is liable to overheat the
instrument or cause a temperature gradient across it. If this is unavoidable, introduce
a heat shield to deflect radiated heat and thus maintain the transmitter at a uniform
temperature within the specified limits.

o

Although the operating temperature of the transmitter extends to below 32
not be allowed to freeze in the pressure port. Failure will occur due to the expansion of the
frozen fluid in the contained volume of the pressure port causing gross over-pressurization.
A failure of this nature is not covered by warranty.

F, fluids must

Wiring Details

The 503FR is designed for use in a 2-wire, 4-20 mA system. A system of this type
requires that the measuring instrument alter the current consumption of an electric circuit
in proportion to pressure changes. The changes in current may be measured using suitable
instruments. Due to the design of the transmitter, it is unable to produce currents less than
approximately 3.3 mA. Should the transmitter output be “locked” at a figure of this order,
it is indicative of a fault and the system should be checked immediately.

Schematic diagrams for incorporation of the transmitter into a control or display loop are
shown below. The supply voltage at the transmitter terminals must be between 10 and 32
Vdc on std. units, and between 10 and 28 Vdc on intrinsically safe units. Polarity of the
transmitter wiring is essential for proper operation.

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Form 963 (03.13) ©SOR Inc.