230-278 Barometric Pressure Transducer 
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| 230-278 Barometric Pressure Transducer |
The 230-278 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 230-278 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 230-278 is operable in temperatures from -40°F to +140°F (-40°C to +60°C). 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.
Principles of Operation The 230-278 utilizes the Setraceram™ capacitive sensor and proprietary custom IC analog circuit. This fundamentally simple design and thermally stable glass fused ceramic sensing capsule is coupled with a 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 instrument.
Specifications
Performance Data| Pressure Range | 500 | 600 | 800 |
| Temperature | Accuracy (mb) | ||
| 68°F (20C) | ±0.6 | ±0.5 | ±0.3 |
| 32-104°F (0/40C) | ±1.2 | ±1.0 | ±.06 |
| 4-122°F (-20/50C) | ±2.0 | ±1.5 | ±1 |
| 40-140°F (-40/60C) | ±2.5 | ±2.0 | ±1.5 |
| Non-Linearity | ±0.5 | ±0.4 | ±0.25 |
| Hysteresis | ±0.06 | ±0.05 | ±0.03 |
| Non-Repeatability | ±0.04 | ±0.03 | ±0.02 |
Long term stability: 0.1 mb/yr
Warm-up: < 1 sec from shutdown mode (Warm-up shift < 0.1 mb maximum)
Response time: < 100 mSec
Proof pressure: 1500 mb
Burst pressure: 2000 mb
Environmental Data
Operating temperature: -40°F to +140°F (-40°C to +60°C)
Storage temperature: -76°F to +248°F (-60°C to +120°C)
Physical Description
Case: Stainless steel and polyester
Pressure fitting: 1/8" (i.d.) barbed fitting
Electrical connection: 5-pin terminal block
Dimensions: 3.6" x 2.4" x 1.0"
Weight: 4.8 oz (135g) approx
Electrical Data
Electrical circuit: 3 or 4 wire
Excitation:** 9.5 to 28 Vdc
Output:*** 0 to 2.5 Vdc, 0 to 5 Vdc
Output impedance: < 10 Ohms
Output noise: < 50 microvolts
Current consumption: 3 mA nominal (operating mode), 1 µA (sleep mode)
** 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
Ordering Information
230-278-5 Barometric Pressure Transducer, 0-5 Vdc, 500 to 1100 mb
230-278-6 Barometric Pressure Transducer, 0-5 Vdc, 600 to 1100 mb
230-278-8 Barometric Pressure Transducer, 0-5 Vdc, 800 to 1100 mb
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Barometric Pressure Sensors
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