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Setra Systems Model 265

Differential Pressure Transducer

1.0 GENERAL INFORMATION

Every Model 265 has been tested and calibrated before shipment. Speciﬁc

performance speciﬁcations are shown on page 3 of this Guide.

Setra Systems 265 pressure transducers sense differential or gage (static) pres-

sure and convert this pressure difference to a proportional high level analog

output for both unidirectional and bidirectional pressure ranges. The Model

265 is available in the following excitation and output versions:

Excitation Output

9-30 VDC 0-5 VDC

9-30 VAC 0-5 VDC

12-30 VAC 0-10 VDC

9-30 VDC (measured between the + and - terminals) 4-20 mA

Check the label on the unit to conﬁrm the excitation and ouput.

2.0 MECHANICAL INSTALLATION

2.1 Media Compatibility

Model 265 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 and compensated temperature limits of the 265 are 0°F to

+150°F (-18°C to +65°C).

2.3 Pressure Fittings

The Model 265 is supplied with two factory installed 1/4” O.D. pressure

ﬁttings for the pressure signal connection and typically installed with 1/4”

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 265 is supplied with the optional Conduit Enclosure, access the

electrical terminations by removing the cover.

For CE compliance a shielded cable with both ends properly grounded is

required.

3.1 Voltage Output Units

The Model 265 voltage output is a 3-wire circuit, with three terminals avail-

able for wiring. These terminals have the designation COM, OUT and EXC (see

Diagram 1). [Note: The - designation above COM and the + designation above

EXC are designations for the current output terminals.] The -Excitation and

-Output are commoned on the circuit (see Diagram 2). The 265 voltage output

can operate from 9-30 VDC or 9-30 VAC excitation with 0-5 VDC output, or 12-

30 VAC excitation with 0-10 VDC output.

Installation Guide

Summary of content (4 pages)

PAGE 1
Installation Guide Setra Systems Model 265 Differential Pressure Transducer 1.0 GENERAL INFORMATION Every Model 265 has been tested and calibrated before shipment. Speciﬁc performance speciﬁcations are shown on page 3 of this Guide. Setra Systems 265 pressure transducers sense differential or gage (static) pressure and convert this pressure difference to a proportional high level analog output for both unidirectional and bidirectional pressure ranges.
PAGE 2
Voltage Circuit Diagram Diagram 1 - COM Readout or DAS SPAN ADJUSTMENT OUT Power Supply ZERO ADJUSTMENT Model 265 + EXC Diagram 2 +EXC -COM OUT Connected to positive terminal of DC/AC power supply Connect as the reference for power supply and output signal Connect to positive terminal of control or pressure 3.2 Current Output Units The Model 265 is a two-wire loop-powered 4 to 20mA current output unit (see Diagram 3).
PAGE 3
location of zero adjustment.) For 0-5 VDC output units, the factory settings are 0.0VDC (±50mV) for unidirectional pressure ranges and 2.5VDC (±50mV) for bidirectional pressure ranges. Optional outputs are set at the same ±1% factory setting. 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 gage, etc.
PAGE 4
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.