Atmospheric pressure sensor at sea level BAR-QNH
- Manufacturer: Nesa
- Category: Meteorology – Climatology, Pressure, Atmospheric pressure, SENSORS
The NESA BAR-QNH is an electronic barometer with an internal circuit for the automatic calculation of QNH, a fundamental parameter in the airport environment. Typical measurement range 500–1100 hPa, sensitivity 0.05 hPa, and accuracy 0.4 hPa @ 20°C, with a piezoresistive bridge transducer.
RS485 digital output and 10-30Vdc power supply, <0.12W consumption. IP65 plastic enclosure, compliant with WMO and CE standards. Typical applications: AWOS stations, airport meteorology, general aviation, and navigation.
Key points
- Typical measurement range 500÷1100 hPa; sensitivity 0.05 hPa; accuracy 0.4 hPa @ 20°C; response time < 2 s
- Piezoresistive bridge transducer; automatic calculation of QNH
- Standard digital RS485 output signal; RS485/USB interface for field programming of altitude above sea level
- Power supply 10÷30Vdc; consumption <0.12W; protections against reverse polarity and transients
- -40 to +60°C; IP65 plastic container; 295g
- Calibrated and verified by comparison with a certified WMO «Primary standard» class reference instrument, with calibration certificate
Technical Frequently Asked Questions
What does BAR-QNH measure?
Atmospheric pressure at sea level, from 500 to 1100 hPa, with sensitivity 0.05 hPa and accuracy 0.4 hPa @ 20°C. Automatically calculates QNH.
What's the way out?
Standard digital RS485 output signal. It also has an RS485/USB interface for field programming of altitude above sea level.
How do you calibrate it?
Each sensor is calibrated and verified by comparison with a certified WMO «Primary standard» class reference instrument, and is supplied with a calibration certificate.
What applications is it used for?
AWOS stations, airport meteorology, general aviation and navigation.
How do I order it?
BAR-QNH sensor and accessories: sensor-datalogger cable (05, 10 or xx, length in meters to be specified) and sensor bracket (SS1, SS2 or SS3). Manufacturer's example: BAR-QNH 10 SS2.
Properties
| Feature | Specification |
|---|---|
| Measurement and operating principle | |
| Measured magnitude | Atmospheric pressure at sea level |
| Typical measurement range | 500÷1100 hPa |
| Sensitivity | 0.05 hPa |
| Precision | 0.4 hPa @ 20°C |
| Response time | < 2 s |
| Transducer type | Piezoresistive |
| Measurement principle | piezoresistive bridge transducer |
| Calculation of QNH | Automatic, with internal circuit |
| Calibration | Each sensor is calibrated and verified by comparison with a certified WMO «Primary standard» class reference instrument.» |
| Calibration certificate | It is supplied with the sensor. |
| Regulatory compliance | EC |
| Standards | WMO |
| Exit signals | |
| Standard exit sign | Digital RS485 |
| Interface | RS485/USB, for field programming of altitude above sea level |
| Power supply, environment, and mechanical data | |
| Feeding | 10÷30Vdc |
| Consumption | <0.12W |
| Current consumption | <2mA |
| Protections | Polarity reversal and transients |
| Operating conditions | -40 to +60°C |
| Container | IP65 Plastic |
| Weight | 295g |
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