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Designed for aviation Automated Weather Observing System (AWOS) and the most discerning meteorology organizations
Overview
For aviation weather, meteorological networks, and other monitoring applications, precise atmospheric pressure is essential for smooth flight operations, accurate numerical weather predictions, and trusted data of record. These records support research, emergency planning, and regulatory agencies globally as critical decisions are made and moved upon.
The BaroVue™30 is purpose-built for that role. It combines Trench-Etched Resonant Pressure Sensor (TERPS) technology, specified with drift less than 0.05 hPa/year, with the most precise measurement circuitry and onboard flexibility to fit into the observation network around it. Available in one-, two-, or three-cell configurations, it can support many different measurement and redundancy requirements.
The BaroVue 30 is also designed with long-term field operations in mind. Flexible communications make it easier to integrate into new or existing systems. Onboard data logging adds another level of data resilience, and 0.05 hPa/year stability limits drift and extends calibration intervals—a true cost saving over the sensor's lifetime.
All BaroVue 30 sensors are fully calibrated, adjusted, and traceable to national standards with full documentation. For organizations that require even more confidence in their observation networks and long-term records, the BaroVue 30 can be purchased with a calibration performed in an accredited ISO/IEC 17025 lab with documentation.
Note: A 1 m (3.28 ft) cable ships with every BaroVue 30. Only order a cable accessory as a replacement or for a non-standard length. Cable lengths up to 152.4 m (500 ft) are supported.
Read MoreBenefits and Features
- Reference-grade measurements
- Long-term stability
- Exceeding WMO tender recommendations
- Flexible one-, two-, or three-cell configurations
- Concurrent dual communications
- Onboard data logging
- Built for demanding environments
- Simpler field service
- Aviation and WMO processed outputs
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Detailed Description
The BaroVue 30 measures atmospheric air (barometric) pressure using TERPS technology. Each TERPS transducer produces a frequency output that varies with applied pressure. The BaroVue 30 resolves that frequency output as well as the reference frequency and calculates absolute pressure once every second with 0.001 hPa resolution with measurement uncertainty within ±0.10 hPa, meeting World Meteorological Organization (WMO) guidelines for surface observations.
The BaroVue 30 is available with one, two, or three independent TERPS sensing elements. In the three-cell configuration, the reported pressure is the median of the three elements, so an excursion on any one element does not reach the output. In the two-cell configuration, the two elements are averaged and can be compared against each other to detect disagreement.
Onboard data logging retains more than two years of 1 Hz pressure measurements. The BaroVue 30 communicates over SDI-12, RS-232, or RS-485 with SDI-12 able to run concurrently with either serial protocol. A USB-C interface provides configuration, data access, and power during field service.
Housed in an IP65-rated aluminum enclosure measuring 15.75 x 9.91 x 5.84 cm (6.2 x 3.9 x 2.3 in.), the BaroVue 30 operates across a temperature range of -60° to +85°C. The sensor mounts to a diamond backplate or, with the DIN rail mounting kit, to a standard DIN rail, connecting through an M12 eight-pin connector on a shielded, twisted-pair cable at lengths verified up to 152.4 m (500 ft).
Exceeding WMO Tender Recommendations
The Guide to Instruments and Methods of Observation (WMO-No. 8, 2024 ed.) provides guidance for sensor performance requirements found in national tender specifications. The BaroVue 30 meets or exceeds these recommendations:
- Range: 450 to 1150 hPa against a required 500 to 1080 hPa range
- Response Time: <2 s time constant compared with WMO’s 2 s response time
- Operating Temperature Range: -60° to +85°C against -40° to +55°C
- Stability: 0.05 hPa/year exceeds WMO’s 0.3 hPa/year by nearly six times
- Uncertainty: ±0.10 hPa at 20°C meets the 0.10 hPa WMO-recommended threshold
- Reported Resolution: 0.001 hPa resolution compared to the WMO recommendation of 0.1 hPa, which is 100 times finer
Flexible Cell Configurations
Available with one, two, or three independent pressure cells, the BaroVue 30 supports a range of measurement and redundancy requirements.
Concurrent Dual Communications
SDI-12 v1.4 runs concurrently with a bi-directional serial interface over either RS-232 or RS-485. The ASCII serial protocol supported on the BaroVue 30 is built to perfectly match that used on the Vaisala PTB330, allowing these sensors to be interchangeable and used in any system supporting the protocol. The BaroVue 30 reports into existing AWOS host software without changes to that software.
Onboard Data Logging
The BaroVue 30 stores more than one year of 1 Hz pressure measurements onboard, providing additional data resiliency directly at the sensor.
Built for Demanding Environments
The operating range of -60° to +85°C spans 145 K, against the -40° to 55°C minimum in WMO-No. 8, 2024 ed. An internal heater holds the electronics at -40°C when the ambient temperature falls between -60° and -40°C.
Simpler Field Service
The externally accessible IP65 USB-C interface allows technicians to service, configure, and power the BaroVue 30 during maintenance without opening the enclosure or interrupting measurements.
Aviation and WMO Processed Outputs
The BaroVue 30 calculates altimeter settings—such as QNH and QFE as well as the three-hour tendency code using the standard WMO and ICAO methods—which are then available for systems to automatically ingest.
Specifications
| Sensor Technology | Trench-Etched Resonant Pressure Sensor (TERPS) |
| Sensing Elements | One, two, or three independent pressure cells |
| Reported Resolution | 0.001 hPa |
| Measurement Uncertainty |
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| Measurement Noise | <0.03 hPa RMS |
| Long-Term Stability | 0.05 hPa/year |
| Pressure Range | 450 to 1150 hPa |
| Time Constant | 2 s to 63% of a step change |
| Measurement Rate | 1 Hz over serial communications |
| Operating Temperature Range | -60° to +85°C |
| Digital Interfaces | SDI-12 v1.4, RS-232, RS-485 (SDI-12 can operate concurrently with RS-232 or RS-485; serial ports are compatible with the Vaisala PTB330 serial protocol.) |
| Processed Outputs | Include QFE, QNH, three-hour pressure tendency code |
| Local Service Port | USB-C (configuration, data access, and power) |
| Onboard Data Logging | 1+ year of 1 Hz pressure data |
| Supply Voltage | 9 to 36 Vdc (USB-C supplies 5 V for setup and test only) |
| Overpressure Limit | >5000 hPa absolute |
| Operating Current |
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| Mounting Description | Diamond backplate; standard DIN rail with mounting kit |
| Cable Connector Type | M12 eight-pin connector on shielded, twisted-pair cable at lengths verified up to 152.4 m (500 ft) |
| Desiccation | Replaceable desiccant is in the sensor housing. In-line desiccant is available as an accessory. |
| Calibration | Standard factory calibration is traceable to NIST or another National Metrology Institute (NMI) with each BaroVue 30. Optionally, ISO/IEC 17025-accredited calibration certificates and a measurement uncertainty record are also available. |
| Performance Class | Meets or exceeds Class A |
| Enclosure Material | IP65-rated aluminum |
| Enclosure Dimensions | 15.75 x 9.91 x 5.84 cm (6.2 x 3.9 x 2.3 in.) |
Documents
Frequently Asked Questions
Number of FAQs related to BaroVue 30: 5
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TERPS stands for Trench-Etched Resonant Pressure Sensor. A silicon resonator etched into the pressure diaphragm shifts its resonant frequency with applied pressure at 1.4 Hz/hPa, so the measurement is a frequency rather than an analog voltage. That provides a noteworthy measurand with resolution extending an order of magnitude greater than typical electrical methods such as resistive and capacitive cells.
The BaroVue™30 measures to the 1/1000th of a hectopascal with a noise floor of 0.0003 hPa. Combined with an uncertainty of ±0.10 hPa at 20°C and 0.05 hPa/year long-term stability, the BaroVue 30 with the TERPS inside will meet the challenge of any demanding (or even just normal) Automated Weather Observing System (AWOS), meteorological, hydrological, or research deployment.
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The BaroVue™30 logs more than one year of 1 Hz pressure data onboard, adding a layer of data resiliency at the sensor itself in the event that a host-system connection is interrupted.
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The BaroVue™30 is designed for aviation weather, national meteorological and hydrological networks, weather and climate research, and other applications requiring high measurement stability and precise barometric pressure measurements over long-term deployments.
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Yes. The Guide to Instruments and Methods of Observation (WMO-No. 8), Volume I, Annex 1.A, specifies a 500 to 1080 hPa range, 0.1 hPa resolution, a 2 s time constant, and 0.10 hPa achievable uncertainty (0.2 hPa for tendency). The BaroVue™30 delivers 450 to 1150 hPa, 0.001 hPa resolution, a 2 s time constant, and ±0.10 hPa at 20°C. Against the tender clauses in WMO IOM Report No. 136, it also clears the 0.3 hPa/year drift limit by a factor of six, at 0.05 hPa/year.
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The BaroVue™10 is a general-purpose barometric pressure sensor designed for unattended automatic weather stations and hydrology applications where price and performance are equally important.
The BaroVue 30 is a reference-grade instrument for applications where measurement quality has to be documented and defended, such as aviation Automated Weather Observing System (AWOS) systems and national meteorological and hydrological networks. The BaroVue30 reports ±0.10 hPa uncertainty at 20°C, 0.05 hPa/year stability, and 0.001 hPa resolution, ships with an NMI-traceable calibration record for every transducer, and is available with redundant sensing elements for assurance.
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