Setra’s Model 278 barometric pressure transducer is designed for use in environmental applications that require excellent accuracy, fast dynamic response, and long-term stability and reliability.
To withstand the environmental extremes typically found in Automated Weather Station (AWS) and environmental monitoring applications, the Model 278 housing is constructed of stainless steel and polyester. A removable 5-pin terminal strip module is provided for easy connection to data logger and signal connections, and a 1/8" Barbed fitting is used for pressure connection. The transducer’s footprint (3.6" x 2.4" x 1.0") makes it ideal for use as a new or drop-in replacement to existing configurations.
The Model 278 is operable in temperatures from -40°C to +60°C (-40°F to +140°F). Users may choose 0 to 2.5 VDC or 0 to 5 VDC output, a 3 or 4 wire circuit and an excitation range of 9.5 to 28 VDC.
This unit consumes low levels of power (3mA nominal) while in operation. Its sleep mode feature reduces power consumption to 1 µA, and provides instant startup for applications where pressure readings must be taken quickly.
The Model 278 utilizes Setra’s Setraceram™ capacitive sensor and proprietary custom IC analog circuit. This fundamentally simple design and thermally stable glass fused ceramic sensing capsule is coupled with Setra’s sophisticated capacitance charge-balance IC circuit where accurate signal conditioning and environmental compensation is performed. The Setraceram™ sensor provides excellent thermal expansion coefficient and low mechanical hysteresis, which contributes to the long-term stability of the Model 278.
|Pressure Range hPa/mbar||500||600||800|
|0 to 40°C||±1.2||±1.0||±0.6|
|-20 to 50°C||±2.0||±1.5||±1|
|-40 to 60°C||±2.5||±2||±1.5|
|Long Term Stabilty||0.1 mb/Yr|
|Warm-up||<1 sec. from Shutdown Mode (Warm-up shift <0.1 mb maximum)|
|Proof Pressure||1500 hPa|
|Burst Pressure||2000 hPa|
|Operating Temperature||-40 to +60°C|
|Storage Temperature||-60 to +120°C|
|Pressure Media||Non-condensing air or gas.|
|Case||Stainless Steel and Polyester|
|Pressure Fitting 1/8" (ID dia.)||Barbed Fitting|
|Electrical Connection||5-Pin Terminal Block|
|Dimensions||3.6" x 2.4" x 1.0"|
|Electrical Circuit||3 or 4 Wire|
|Excitation||9.5 to 28 VDC|||
|Output||0 to 2.5VDC,|
0 to 5 VDC
|Output Impedance||<10 Ohms|
|Output Noise||<50 Microvolts|
|Current Consumption||3 mA Nominal (Operating Mode),|
1 µA (Sleep Mode)
|||The root sum squared (RSS) of end point non-linearity, hysteresis, nonrepeatability, and calibration uncertainty.|
|||Units calibrated at nominal 70°F. Maximum thermal error computed from this datum.|
|||Internal regulation minimizes effect of excitation variation, with <0.02 mb output change over 9.5 VDC to 28 VDC range.|
|||Zero output saturates at about 20 mV|
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