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Modell SET-270

  • SETRACERAM™ Sensor
  • High Accuracy, ±0.05% FS
  • ±0.03% FS Optional Accuracy
  • Repeatability Within 0.01% FS
  • Excellent Long-Term Stability
  • Low Power Consumption
  • Instant Warm-Up
  • Fast Response
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For many years, high accuracy environmental and test & measurement applications around the world have relied on the consistent performance of the Setra Model 270 pressure transducer. Applications range from remote weather monitoring and avionics systems, endorsed by government agencies, to crucial compensation for barometric pressure variations in laser interferometers.

Long-term reliability and stability in such demanding application environments are achieved in the 270 with the combination of the SETRACERAM™ capacitive sensor and Setra’s proprietary custom IC analog circuit. The fundamentally simple design and thermally stable glass fused ceramic sensing capsule is coupled with the sophisticated capacitance charge-balance IC circuit where accurate signal conditioning and environmental compensation is performed. Standard accuracy is 0.05% Full Scale, end point method. Higher accuracy and thermal specifications are also available.

Performance Data
Accuracy<±0.05% FS[1]
Non-Linearity (End Point)±0.05% FS
Non-Linearity (Best Fit Straight Line)±0.03% FS
Hysteresis<0.01% FS (Typical)
Non-Repeatability0.01% FS
ResolutionInfinite, limited only by output noise level (0.005% FS)
Temperature Compensated Range-1 to +49°C
Thermal Zero Shift
<±0.18% FS/50°C[2]
Thermal Zero Shift
(Other Ranges)
<±0.09% FS/50°C[2]
Thermal Coefficient Sensitivity<±0.09% FS/50°C[2]
Long Term Stability<±0.1% FS over 6 months at 70°F
Static Acceleration Effect<±0.01% FS/G
Warm-up<±0.04% FS shift after 20 minutes at constant temperature and pressure
Time Constant< 10 milliseconds to reach 90% final output with step function pressure input
Environmental Data
Operating Temperature-18 to +80°C
Storage Temperature-54 to +120°C
Vibration2g from 5Hz to 500Hz
Shock50g Operating, 1/2 sine 10 ms
Pressure fitting1/8"-27 NPT Internal
Electrical connection2-foot Multi-conductor Cable
Weight (approx.)0.25 kg
Pressure MediaNon-condensing air or gas compatible with hard anodized aluminum, alumina ceramics, gold, fluorocarbon elastomer sealant and Buna-N O-Ring.
Electrical Data
Electrical Circuit4-Wire (+Exc, -Exc, +Out, -Out)[3]
Excitation22 to 32 VDC
Fully protected against miswiring
Output0 to 5 VDC[5][6]
IsolationThe insulation resistance between all signal leads tied together and case ground is 100 megohms minimum at 25 VDC.
Output Impedance<5 ohms
Output Noise<200 microvolts RMS (0 Hz to 100 Hz)
Current Consumption8 mA (0.2 Watts)

[1]RSS of Non-Linearity, Hysteresis, and Non-Repeatability. Higher accuracy units available on special order.
[2]Units calibrated at nominal 70°F. Maximum thermal error computed from this datum.
[3]For best performance, either negative excitation or negative output should be connected to case (ground). Both leads cannot be connected to case (ground). Units calibrated at the factory with negative excitation connected to case.
[4]Internal regulation minimizes effect of excitation variation, with < ±0.005% FS output change. Will operate on 28 VDC aircraft power per MIL-STD-704A and not be damaged by emergency power conditions.
[5]Calibrated into a 50K ohm load, operable into a 5000 ohm load or greater.
[6]Zero output factory set to within ±5 mV. Span (Full Scale) output factory set to within ±5 mV.

Verfügbare Optionen
(623) 12 VDC excitation
Excitation11 to 15 VDC
(703) Extended Compensated Temperature Range
Compensated Temperature Range-13°F to +150°F (±0.13% FS/100°F zero and span effect).
Cannot be ordered with option 707.
(707) Higher Accuracy
Accuracy±0.03% FS (RSS) with ±0.027% FS Linearity (End Point Method). Cannot be ordered with option 703.
(803)-(825) Custom Cable Length
Cable LengthUp to 25 ft.
Please specify when ordering
(e.g. 805 for 5 ft. cable)
(865) Weather Proof Enclosure
EnclosureNEMA 4 Weather Proof
(911) Stainless Steel Tag
TagEtched Metal Stainless Steel
(SR) Special Range
RangePlease specify when ordering.

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Operating Instructions
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