Differential Pressure Transducer for HVAC – Model 267/267MR

 

setra

Systems Model 267 and 267MR pressure transducers sense gauge (static) or differential pressure and convert this pressure difference to a proportional electrical output. The 267 series is offered with a high level voltage output or 4-20 mA current output. The 267MR offers multi-range capability and field configurable 0-5 VDC or 0-10 VDC output, as well as a 4-20 mA output.

In a typical Setra configuration, a compact housing contains two closely-spaced, parallel, electrically-isolated metallic surfaces, one of which is essentially a diaphragm capable of slight flexing under applied pressure. The diaphragm is constructed of low-hysteresis material such as 17-4 PH SS or a proprietary compound of fused glass and ceramic (Setraceramâ„¢). These firmly secured surfaces (or plates) are mounted so that a slight mechanical flexing of the assembly, caused by a minute change in applied pressure, alters the gap between them (creating, in effect, a variable capacitor). The resulting change in capacitance is detected by a sensitive linear comparator circuit (employing proprietary, custom-designed ASICs), which amplifies and outputs a proportional, high-level signal.

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  • Model 267MR Offers Multi-Range Capability, 6 Field Selectable Ranges via Dip Switches, and Field Selectable 0-5 or 0-10 VDC Output
  • Model 267 Offers an Optional 3 1/2 Digit LCD Display with a 0.5% FS Standard Accuracy
  • NEMA 4/IP65 Rated Housing
  • Optional Accuracies as High as 0.25% FS
  • 24 VAC or 24 VDC Excitation
  • PG-9, PG13.5 or Conduit Electrical Termination
  • Integral Static Pressure Probe
  • Ranges as low as 0.1 in. W.C. (25 Pa)
  • Meets CE Conformance Standards

 

  • Heating, Ventilating and Air-Conditioning (HVAC)
  • Energy Management Systems
  • Static Duct Pressure
  • Clean Room Pressure
  • Oven Pressurization and Furnace Draft Controls

 

Technical Details
Performance
Standard Optional
Accuracy* RSS (At Constant Temp.) ±1.0% FS ±0.4% FS ±0.25% FS
Non-Linearity, BFSL ±0.98% FS ±0.38% FS ±0.22% FS
Hysteresis 0.10% FS 0.10% FS 0.10% FS
Non-Repeatability 0.05% FS 0.05% FS 0.05% FS
Thermal Effects**
Compensated Range °F(°C) +40 to +150 (+5 to +65)
Zero/Span Shift %FS/°F(°C) ±0.033 (±0.06)
Maximum Line Pressure 10 PSI
Overpressure 10 PSI in Positive or Negative Direction
Warm-up Shift ±0.1% FS Total
Position Effect**
Range To 0.5 in. / To 1.0 in. / To 2.5 in. / To 5.0 in.
*RSS of Non-Linearity, Non-Repeatability and Hysteresis.
**Units calibrated at nominal 70°F. Maximum thermal error computed from this datum.
***Unit is factory calibrated at 0g effect in the vertical position.
Physical Description
Case Fire-Retardant Glass Filled
Polyester (UL 94 V-0 Approved)
Mouting Four screw holes on removable
zinc plated steel base (designed
for 2.75” snap track)
Electrical Connection Screw Terminal Strip
Electrical Termination PG-9/PG13.5 Strain Relief, 1/2"
Conduit Opening, or 9 Pin D-Sub
Connector*
Zero and Span Adjustments Accessible on top of case
Display (Optional on 267 only) 3 1/2 Digit LCD Integral
Display (1.74"W x 0.78"H)
Pressure Fittings 3/16" O.D. Barbed Brass for 1/4"
Push-On Tubing (Standard)
Static Pressure Probe (Optional)
1/4" NPTF Brass (Optional)
Mounting 2 Mounting Tabs with 0.18" Holes
Pressure Probe Assembly is Supplied
with a 7.8" 6061 Aluminum Alloy
Probe and a Gasket to Seal Against
the Duct
Weight (Approx.) 9.0 ounces (255 grams)
9.5 ounces (Duct Probe Assembly)
*9 pin D-sub Connector is not suitable for NEMA4/IP-65 environments.
Electrical Data (Voltage)
Circuit 3-Wire (Exc, Gnd, Sig)
Protected from Miswiring
Excitation (for 0-5 VDC Output) 9 to 30 VAC/12 to 40 VDC
Excitation (for 0-10 VDC Output) 11 to 30 VAC/13 to 40 VDC
Model 267
Output* 0 to 5 VDC**
0 to 10 VDC**
Model 267MR
Output* (Field Selectable) 0 to 5 VDC**
0 to 10 VDC**
Bidirectional Output at Zero Mid-Range of Specified Output
Output Impedance 100 Ohms
Re-Ranging (267MR only) 5 Position Dip Switches
(Located Inside Case)
*Calibrated into a 50K ohm load, operable into a 5000 ohm load or greater.
**Zero output factory set to within ±50mV (±25 mV for optional accuracies).
Span (Full Scale) output factory set to within ±50mV. (±25 mV for optional accuracies).
Electrical Data (Current)
Circuit 2-Wire
Protected from Miswiring
Output* 4 to 20 mA**
Bidirectional Output at Zero 12 mA
External Load 0 to 800 Ohms
Minimum loop supply voltage (VDC) = 9 + 0.02 x (Resistance of receiver plus line).
Maximum loop supply voltage (VDC) = 30 + 0.004 x (Resistance of receiver plus line).
Re-Ranging (267MR only) 4 Position Dip Switches (located inside case)
*Calibrated with a 24 VDC loop supply voltage and a 250 ohm load
**Zero output factory set to within ±0.16mA (±0.08 mA for optional accuracies)
Span (Full Scale) output factory set to wtihin ±0.16mA (±0.08 mA for optional accuracies)
Pressure Media
Typically Air or Similar Non-Conducting Gases
Environmental Data
Temperature
Operating* °F (°C) 0 to +150 (-18 to +65)
Storage °F (°C) -65 to +180 (-54 to +82)
*Operating temperature limits of the electronics only.
Pressure media temperature may be considerably higher or lower.
Note: Specification are Subject to change without notice


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