INFWIN DigiTHP-Gen2 Vapor Pressure, Air Temperature, Humidity and Barometric Sensor
The INFWIN DigiTHP-GEN2 is an air humidity, temperature, and barometric pressure sensor with a digital SDI-12 or RS485/Modbus-RTU interface. Its sensing elements sit on a PCB in the sensor tip, with the acquisition circuit fully over-moulded and each unit individually factory-calibrated. At just 110 × 16 mm, it fits into most standard radiation shields and field enclosures. Accuracy grade, power supply, output interface, encapsulation, connector, and cable length are all configurable via ordering code - the default variant (DigiTHP-GEN2-AACAAB002) ships with RS485/Modbus-RTU output, SHT40/BMP280-grade accuracy, 4.5–18V DC supply, standard encapsulation, a cold-pressed terminal connector, and a 2 m cable.
Temperature and humidity are measured with a precision SENSIRION sensor, with barometric pressure measured by an additional BOSCH MEMS chip. From these, DigiTHP-GEN2 derives secondary values including dew point, frost point, vapor pressure, and vapor concentration. Reverse power protection and built-in TVS/ESD protection are included.
Key Features
- Triple measurement: Air humidity, temperature, and barometric pressure in a single sensor
- Secondary calculated values: Dew point, frost point, vapor pressure, and vapor concentration
- Precision sensing elements: SENSIRION humidity/temperature sensor plus a BOSCH MEMS barometric sensor; each unit individually factory-calibrated
- Selectable accuracy grade: SHT40 & BMP280 (±0.2°C, ±1.8% RH, ±1 hPa typical) or SHT45 & BMP280 (±0.1°C, ±1.0% RH, ±1 hPa typical)
- Digital output: SDI-12 (V1.3) for universal datalogger compatibility and low-power use, or RS485/Modbus-RTU for long cable runs or multi-sensor networks
- Compact size: 110 × 16 mm sensor body fits standard radiation shields
- Cleanable filter cap: 10 µm copper sintering filter protects the sensing elements and can be cleaned in place
- Flexible mounting: Wall mounting or pipe flange insertion
- Reverse power protection: Built-in TVS/ESD protection
- RS485 Modbus-RTU protocol: Standard Modbus register map; configurable slave address, baud rate, parity, and stop bits
- Connector options: Cold-pressed terminal or stripped & tinned lead wires
- Configuration utility: SensorOneSet software included for sensor configuration via RS485
- Cable length: 2 m standard; custom lengths available
Applications
- Smart agriculture and greenhouse monitoring
- Canopy monitoring
- Reference evapotranspiration calculations
- Routine weather monitoring
- Building humidity monitoring and mold remediation
- Modeling processes affected by vapor pressure or humidity
Important Notes
- The long-term operating temperature is −40°C to +80°C, even though the temperature sensing element itself is rated to +125°C.
- IP56 rated - protected against dust ingress and water jets, but not rated for submersion or direct burial.
- Operating environment is non-condensing.
- The copper sintering filter cap can be cleaned in place; replace if damaged to maintain accuracy and IP rating.
Specifications
| Humidity | |
| Range | 0–100% |
| Resolution | 0.01% |
| Typical accuracy | ±1.8% RH (SHT40); ±1.0% RH (SHT45) |
| Temperature | |
| Range | −40°C to +125°C (long-term operating range −40°C to +80°C) |
| Resolution | 0.01°C |
| Accuracy | ±0.2°C (SHT40); ±0.1°C (SHT45) |
| Barometric Pressure | |
| Range | 300–1100 mbar |
| Resolution | 0.1 mbar |
| Accuracy | ±0.15 mbar (relative); ±1 mbar (absolute) |
| Electrical | |
| Output interface | RS485 (Modbus-RTU) or SDI-12, V1.3 (selectable via ordering code) |
| Power supply | 4.5–18V DC |
| Quiescent current | RS485: <300 µA; SDI-12: <10 µA |
| Measuring current | 10 mA during 50 ms measurement |
| Mechanical | |
| Dimensions | 110 × 16 mm (sensor body) |
| Encapsulation | Standard: ABS body with 10 µm copper sintering filter cap |
| IP rating | IP56 |
| Connector | Cold-pressed terminal or stripped & tinned lead wires (selectable via ordering code) |
| Cable length | 2 m standard; custom length available |
| Installation | Wall mounting or pipe flange insertion |
| Environmental | |
| Operating temperature | −40°C to +80°C, non-condensing |
Ordering Code Guide
| Code 1: Product Series | DigiTHP-GEN2 | DigiTHP-GEN2, 2nd generation DigiTHP sensor |
| Code 2: Measuring Parameters | A | Air Humidity, Temperature, Barometric measurement (with secondary dew point, frost point, vapor pressure, vapor concentration) |
| Code 3: Accuracy | A C |
±0.2°C, ±1.8% RH, ±1 hPa (SHT40 & BMP280 typical) ±0.1°C, ±1.0% RH, ±1 hPa (SHT45 & BMP280 typical) |
| Code 4: Power Supply | C X |
4.5–18V DC Customize |
| Code 5: Output Interface | A B X |
RS485 (Modbus-RTU) SDI-12 Customize |
| Code 6: Encapsulation | A X |
Standard (ABS + copper sintering filter) Customize |
| Code 7: Connector | B C |
Cold-pressed terminal Stripped & tinned lead wires |
| Code 8: Cable Length | 002 XXX |
2 meters Custom (XXX = length in meters, e.g. 005 = 5 m) |
Default Variant: DigiTHP-GEN2-AACAAB002
| Measuring parameters | Air humidity, temperature, and barometric pressure |
| Accuracy | ±0.2°C, ±1.8% RH, ±1 hPa (SHT40 & BMP280 typical) |
| Power supply | 4.5–18V DC |
| Output interface | RS485, Modbus-RTU |
| Encapsulation | Standard (ABS + copper sintering filter) |
| Connector | Cold-pressed terminal |
| Cable length | 2 meters |
Custom variants (power supply, output interface, encapsulation, connector, cable length) are available; contact us to discuss your requirements.