Setra 264 Installation Guide

6.0 RETURNING PRODUCTS FOR REPAIR

Please contact a Setra application engineer (800-257-3872, 978-263-1400) before
returning unit for repair to review information relative to your application. Many times
only minor field adjustments may be necessary. When returning a product to Setra,
the material should be carefully packaged and shipped prepaid to:

Setra Systems, Inc.
159 Swanson Road
Boxborough, MA 01719-1304
Attn: Repair Department
To assure prompt handling, please supply the following information and include it
inside the package or returned material:

1. Name and phone number of person to contact.

2. Shipping and billing instructions.

3. Full description of the malfunction.

4. Identify any hazardous material used with product.

Notes: Please remove any pressure fittings and plumbing that you have installed and
enclose any required mating electrical connectors and wiring diagrams.

Allow approximately 3 weeks after receipt at Setra for the repair and return of the unit.
Non-warranty repairs will not be made without customer approval and a purchase
order to cover repair charges.

Calibration Services
Setra maintains a complete calibration facility that is traceable to the National Institute
of Standards & Technology (NIST). If you would like to recalibrate or recertify your
Setra pressure transducers or transmitters, please call our Repair Department at 800­257-3872 (978-263-1400) for scheduling.

7.0 WARRANTY AND LIMITATION OF LIABILITY

SETRA warrants its Model 264 products to the original consumer purchaser against defects for a period of three
years from the date of sale by SETRA, as shown in its shipping documents.
Without charge, SETRA will repair or replace products found to have manufacturing defects within the warranty
period.

The serial number or date code must not have been removed, defaced or otherwise changed.
SETRA must be notified in advance of any returns; any products returned to SETRA must be transportation
prepaid.

The foregoing warranty is in lieu of all warranties, express, implied or statutory, including but not limited to, any
implied warranty of merchantability for a particular purpose.

SETRA’s liability for breach of warranty is limited to repair or replacement, or if the goods cannot be repaired
or replaced, to a refund of the purchase price. SETRA’s liability for all other breaches is limited to a refund of
the purchase price. In no instance shall SETRA be liable for incidental or consequential damages arising from a
breach of warranty, or from the use or installation of its products.

No representative or person is authorized to give any warranty other than as set out above or to assume for
SETRA any other liability in connection with the sale of its products.

For all CE Technical questions, contact Setra Systems, USA. EU customers may contact our EU representative
Hengstler GmbH, Uhlandstr 49, 78554 Aldingen, Germany (Tel: [phone]; Fax: [phone]).

SS0471 Rev.L 11/02/16

Installation Guide

Setra Systems Model 264

Differential Pressure Transducer

1.0 GENERAL INFORMATION
Every Model 264 has been tested and calibrated before shipment. Specific

performance specifications are shown on page 3 of this Guide.

Setra Systems 264 pressure transducers sense differential or gauge (static) pres-

sure and convert this pressure difference to a proportional high level analog
output for both unidirectional and bidirectional pressure ranges. Two standard
output versions are offered: A voltage output of 0 to 5 VDC or a current output
of 4 to 20 mA.

2.0 MECHANICAL INSTALLATION

2.1 Media Compatibility

Model 264 transducers are designed to be used with air or nonconducting
gases. Use with liquids or corrosive gases will damage the unit.

2.2 Environment
The operating temperature limits of the 264 are 0°F to +175°F (-18°C to +79°C).
The compensated temperature range is 0°F to +150°F (-18°C to +65°C).

2.3 Pressure Fittings
The Model 264 is designed to be used with 3/16” I.D. push-on tubing. Both the
positive (high) pressure port and the reference (low) pressure port are located
on the front of the unit, labeled “HIGH” and “LOW” respectively. For best results
(shortest response times), 3/16” I.D. tubing is suggested for tubing lengths up to
100 feet long, 1/4” I.D. for tubing lengths up to 300 feet, and 3/8” I.D. for tubing
lengths up to 900 feet.

3.0 ELECTRICAL INSTALLATION

If the Model 264 is supplied with the optional Conduit Enclosure, access the

electrical terminations by removing the cover. The output of 0 to 5 VDC or
4 to 20 mA is designated by specific Code numbers in the configurable part
number; i.e., 2641xxxxx 11xx x, where 11 designates the 4 to 20 mA output;
2641xxxxx 2Dxx x, where 2D designates the 0 to 5 VDC output. The output is
also shown on the 264 label.

For CE Compliance, a shielded cable with both ends properly grounded is

required.

3.1 Voltage Output Units
The Model 264 voltage output is a 3-wire circuit, with three terminals

available for wiring. These terminals have the designation COM, EXC and OUT
(See Diagram 1). The power supply and signal references are commoned on
the circuit (See Diagram 2). The 264 voltage output can operate from 9-30 VDC
excitation. The 264 has a 0 - 5 VDC output.

Diagram 1

3.2 Current Output Units

The Model 264 is a two-wire loop-powered 4 to 20mA current output unit and
delivers rated current into any external load of 0 to 800 ohms. These terminals
have the designation of + and - (See Diagram 3). The current flows into the +
terminal and returns back to the power supply through the - terminal (See
Diagram 4). The power supply must be a DC voltage source with a voltage
range between 9 and 30 measured between the + and - terminals. The
unit is calibrated at the factory with a 24 VDC loop supply voltage and a 250
ohm load.

+ OUT Connect to positive terminal of control or pressure
monitor
+EXC Connected to positive terminal of DC power supply

COM Connect as the reference for power supply and
output signal

Voltage Circuit Diagram

Readout

or

DAS

Power

Supply

OUT

EXC

COM

Diagram 2

Current Circuit Diagram

9 to 30 VDC+_

Model

264

264

location of zero adjustment.) For 0-5 VDC output units, the factory settings
are 0.050VDC (±50mV ) for unidirectional pressure ranges and 2.5 VDC (±50mV)
for bidirectional pressure ranges. Optional outputs are set at the same ±1%
factory setting tolerance.

4.2 Voltage Output Span Adjustment (Complete the zero adjustment
before setting span.)

Span or full scale output adjustments should only be performed by using an

accurate pressure standard (electronic manometer, digital pressure gauge, etc.),
with at least comparable accuracy to the 264 transducer (±1% FS). With full
range pressure applied to the high pressure port (reference port open to atmo­sphere), the span may be adjusted by turning the SPAN adjustment screw. (See
Diagram 1 for location of the SPAN adjustment.) For 0-5 VDC output units, the
factory settings at full range pressure are 5.050 VDC (±50mV) for unidirectional
and bidirectional ranges.

4.3 Current Output Zero Adjustment

While monitoring the current output between the + and - terminals, and with

both pressure ports open to atmosphere, the zero may be adjusted by turning
the zero adjustment screw. (See Diagram 3 for location of zero adjustment.) The
factory settings are 4mA (0.16mA) for unidirectional pressure ranges and 12mA
(0.16mA) for bidirectional ranges.

4.4 Current Output Span Adjustment
Span or full scale output adjustments should only be performed by using an

accurate pressure standard (electronic manometer, digital pressure gauge,
etc.) with at least comparable accuracy to the 264 transducer (±1% FS). With
full range pressure applied to the high pressure port (reference port open to
atmosphere), the span may be adjusted by turning the SPAN adjustment screw.
(See Diagram 3 for location of SPAN adjustment.) The factory settings are 20mA
(0.16mA) for unidirectional and bidirectional pressure ranges.

Current

Diagram 3

Monitoring

Device

Diagram 4

Accuracy RSS

(at constant temperature) Compensated Range °F(°C) 0 to +150 (-18 to +65)
Non-Linearity, BFSL ±0.96% FS Zero/Span Shift %FS/°F(°C) 0.033 (0.06)

4.0. CALIBRATION

The 264 transducer is factory calibrated and should require no field adjust­ ment. Generally, the mounting position will have a zero shift effect on ranges
below 1” WC. Whenever possible, any zero and/or span offsets should be
corrected by software adjustment in the user’s control system. However, both
zero and span adjustments are accessible either on the front of the unit or by
removing the optional conduit enclosure. The 264 transducer is calibrated in
the vertical position at the factory.

Hysteresis 0.2% FS Maximum Line Pressure 10 PSI
Non-Repeatability 0.1% FS Overpressure Up to 10 PSI
(Range Dependent)

*RSS of Non-Linearity, Non-Repeatabilit y and Hysteresis.

Position Effects
(Unit is factory calibrated at 0g effect in the vertical position)
Range Zero Offset (%FS/G)
0 to 0.1 in. WC 2.1

4.1 Voltage Output Zero Adjustment

While monitoring the voltage between the positive output (OUT) and
common (COM), and with both pressure ports open to atmosphere, the zero
may be adjusted by turning the zero adjustment screw. (See Diagram 1 for

2 3

0 to 1.0 in. WC .22
0 to 5 in. WC .14
0 to 10 in. WC .12

*

±1.0% FS Thermal Effects

5.0 MODEL 264 PERFORMANCE SPECIFICATIONS