Installation Guide Model 267 and 267MR Differential Pressure Transducers 1-800-257-3872 Toll Free 1-978-264-0292 Fax www.setra.
Setra offers a complete line of HVAC Products Model 264 For Static Duct and Flow Measurement Model 265 Smaller Size 10 PSI Overpressure Model 230 Wet/Wet Differential Pressure Measurement Model 209 Rugged Low Cost Gauge Pressure Measurement from 0-5 to 0-1000 PSIG
Table of Contents 1.0 GENERAL INFORMATION.................................................................................................1 2.0 MECHANICAL INSTALLATION.........................................................................................2 2.1 Media Compatibility.............................................................................................2 2.2 Environment...........................................................................................................2 2.
Setra Systems Model 267 and Model 267MR 1.0 GENERAL INFORMATION Every Model 267 and Model 267MR (Multi-Range) has been tested and calibrated before shipment. Specific performance specifications are listed on Page 9 of this Guide. The Model 267 is single range only. The Model 267MR has field selectable range capability. The 267MR is factory calibrated for the highest pressure range. The range label on the cover of the unit indicates the factory-calibrated range.
2.0 MECHANICAL INSTALLATION 2.1 Media Compatibility Model 267 and 267MR 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 267 and 267MR are as follows: Operating Temperature Compensated Temperature Range 0°F to +150°F (-18°C to +65°C) +40°F to +150°F (+5°C to +65°C) 2.
Electrical Connections Range Select Switches (267MR version only) +EXC GND +SIG Span Zero Diagram 1 The Model 267 and 267MR voltage output is a 3-wire circuit, with three terminals available for wiring (see Diagram 1). The -Excitation and -Output are commoned on the circuit (see Diagram 2). The excitation/output specifications are: Excitation Output 9 to 30 VAC / 11.5 to 42 VDC 12 to 30 VAC / 13 to 42 VDC 0 to 5 VDC 0 to 10 VDC The 267MR has a field selectable 0 - 5 or 0 - 10 VDC output.
3.2 Voltage Output Units - 9 pin D-sub Connector Electrical Termination The Model 267 and 267MR voltage output is a 3-wire circuit, with three pins available for wiring (see Diagram 3). The voltage output pin designations are shown in Diagram 4: Diagram 4 PIN 1 + OUTPUT PIN 4 +EXC PIN 8, 9 COMMON Diagram 3 CONNECTION 9 pin D-sub Connector Electrical Termination +EXCITATION 4 +OUTPUT 1 COMMON 8,99 Excitation Output 9 to 30 VAC / 11.
3.4 Current Output Untis – 9 pin D-sub Connector Electrical Termination The Model 267 and 267MR is a two-wire loop-powered 4 to 20mA current output unit (see Diagram 6). The current flows into +EXC. Pin 4 (+EXC) and returns back to the power supply through Pin 9 (-EXC) (see Diagram 7). The power supply must be a DC voltage source with a voltage range between 9 and 30 measured between Pin 4 and Pin 9 (-EXC). The unit is calibrated with a 24VDC loop supply voltage and a 250 ohm load.
2. If unshielded cable is used, an earth grounded metal conduit fitting can be used to replace the shielded cable. 3. For a sensor with a metal body or enclosure, the body/enclosure must be grounded to earth. If a protective metal housing is used, the metal housing should be grounded to earth 4. If a protective plastic housing is used, the housing must be able to withstand at least 2 KV from the housing to earth ground, without damaging the circuit. 4.0.
with at least comparable accuracy to the 267 or 267MR 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 SPAN adjustment.) Factory settings are: Unidirectional Pressure Ranges Span Adjustment Output 5.0 VDC (±25 mV) 0-5 VDC 10 VDC (±50 mV) 0-10 VDC Example 1: put Example 2: Bidirectional Pressure Ranges Span Adjustment Output 2.
6.0 Multi-Range Operation - Model 267MR only The 267MR is re-rangeable by accessing the switches located internal to the transducer housing. To access the “Dip” switches, remove the screws on the top of the case and lift off the cover. The “Dip” switches are located on the electronics board as shown in Diagrams 1 and 5. The voltage output version has 5 switches. The current version has 4. The location of these switches, “on” (up position) or “off” (down position), determine what range has been selected.
Table-2 Range Switching Instructions for Pascal Ranges MR5 MR6 MR7 MR8 MR9 SWITCH RANGE RANGE RANGE RANGE RANGE SETTINGS 0-5V OUTPUT 0-25Pa Factory Default Setting 0-200Pa 0-1000Pa 0-2500Pa 0-7500Pa 0-100Pa 0-500Pa 0-1250Pa 0-3750Pa 0-50Pa 0-250Pa 0-625Pa 0-1875Pa ±12.
8.0 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.
SS2039 Rev.
