SOR 536CR User Manual
536CR
eral Instructions
Low Power Pressure Transmitter
General Instructions
These instructions provide information for installation, process connection,
®
electrical connection and field calibration of SOR
536CR Pressure
Transmitters. The 536CR Pressure Transmitter consists of a field-proven
ection,
ven
pressure transducer and a reliable electronic circuit. The housing
features external adjustments and stainless steel construction.
NOTE: This instrument is non-repairable. If you suspect that it is defective,
contact the factory or the SOR representative in your area for a return
authorization number.
,
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.
Normally, line mounting provides adequate support for the instrument.
When the installation is complete, the external adjustments must be
accessible. (See
) Determine whether the process connection or
the electrical connection will be made first.
t.
Making the Process Connection First
The process connection is threaded onto a fitting within an adequately
supported process piping system. Use two open-end wrenches when connecting the
pressure port to a process piping system: one wrench to hold the hex flats of the pressure
connection, and the other to tighten the process fitting. Do not loosen the instrument
pressure port from the housing.
NOTE: If you suspect that a product is defective, contact the factory or the SOR Representative
in your area for a return authorization number (RMA). This product should only be installed by
trained and competent personnel.
Table of Contents
Design and
specifications are
subject to change
without notice.
For latest revision, go to
www.sorinc.com
Installation .......................................1
Electrical Termination ..........................2
Calibration .......................................3
Dimensions ......................................4
Control Drawing .................................5
Form 921 (03.13) ©SOR Inc.
Registered Quality System to ISO 9001
1/8
Making the Electrical Connection First
The electrical connection may be installed on an adequately supported rigid conduit
system. Use suitable locknuts (not provided) when mounting the instrument to an
unthreaded (knockout) hole. Process connection pipe or tubing may be rigid or flexible.
Securely connect the conduit pipe or fitting by holding the hex on the electrical connection
while tightening.
Units in hazardous locations – prior to removal from service, make sure
that the work area is declassi ed. Failure to do so could result in severe
personal injury or substantial property damage.
Electrical Termination
Three-conductor shielded cable is provided as standard. If the optional screw terminal
housing was specified, wire according to screw terminal designation below.
Wire Lead Color
Red + 10-30 VDC power supply
Black - Power supply return
White 1-6 VDC
(shield) GND
Power supply
10-30 VDC
Optional Terminal
Designation
Case
Ground
Connection
1-5 VDC output (with respect
to power supply return)
(ease ground) should be
connected to earth ground
Red
Black
White
Shield
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Volt meter
1 - 5 VDC
Zero
Span
Not Used
Form 921 (03.13) ©SOR Inc.
Calibration
Two calibration screws (zero and span) are located underneath the adjustment cover. (See
) Loosen the cover screws slightly (do not remove) and rotate the cover to reveal the
adjustment screws.
Numbers on the enclosure identify the adjustment screws: 1, 2 and 3.
Adjustment #1: Zero
Adjustment #2: Span
Adjustment #3: Not used
Unless specified otherwise, the transmitter is factory calibrated to 1 VDC @ 0 psi and 5
VDC at the top of the adjustable range specified on the nameplate.
Calibration Procedure
The zero and span calibration procedure should be performed under ambient process
temperature conditions.
A pressure source with a calibrated reference gage, a voltmeter and a DC voltage supply are
required. (See
and span adjustments, turn the adjustment screw clockwise to increase, counterclockwise
to decrease.
) Note the adjustable range on the instrument nameplate. For both zero
Connect the transmitter as shown in . The case ground must be connected to the
earth ground.
Apply pressure at which 1 VDC output is desired. (Zero may be adjusted + 10% of the
Upper Range Limit.)
With the pressure source steady at the desired zero level, rotate the zero adjustment
(#1) for a 1 VDC indication on the voltmeter.
Apply pressure at which 5 VDC output is desired. The span may be adjusted from 20 to
100% of the upper range limit specified on the nameplate. (Maximum turndown is 5:1.)
With the pressure source steady at the desired span level, rotate the span adjustment
(#2) for a 5 VDC indication on the voltmeter.
Repeat Steps 2 through 5 as needed if offsetting 1 VDC from the normal zero point.
Form 921 (03.13) ©SOR Inc.
3/8
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