PRHT-A1 Temperature, Relative Humidity and Pressure Sensor

T / RH / Pressure Environmental Sensor, Digital I2C, A-Series, Barometric compensation

All-in-one T / RH / pressure reference for advanced air quality and gas monitoring

The PRHT-A1 integrates temperature, relative humidity and barometric pressure into a single A-Series module for precise environmental compensation of gas, VOC and particulate sensors. It provides digitally corrected output over I2C, enabling direct connection to the host microcontroller. PRHT-A1 is ideal for safety and air quality instruments that need pressure-corrected NDIR CO2, PID and electrochemical measurements. OEMs benefit from reduced sensor count, faster design-in and more stable long-term performance.



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Key Specifications:

Sensor Model

Target Parameters

Technology / Package

Measurement Range 

Typical Accuracy 

Interface / Supply

PRHT-A1

Temperature, Relative Humidity & Barometric Pressure (absolute) 

Digital environmental sensor, A-Series format 

Temperature: –40 to +80°C

Relative Humidity: 0 – 95 % RH 

Barometric pressure (absolute, environmental range) 

Temperature error: ±0.2°C

RH error: ±2% RH 

Pressure error (typical): ±0.5 hPa (constant temperature), ±1 hPa (–10 to +50°C) 

I2C digital output; 2.3 – 3.6 V
supply



Feature Benefit

Combined T / RH / pressure sensing 

Replaces three separate sensors, simplifying BOM and layout in compact multi-gas analyzers. 

Barometric (absolute) pressure measurement 

Enables pressure-corrected NDIR CO2 and PID readings for more accurate ppm and % vol reporting.

Digital I2C output with corrected values 

 Reduces firmware effort and eliminates the need for complex analogue signal conditioning. 

Tight error budgets on T, RH and pressure 

Supports demanding IAQ and industrial safety applications where compensation accuracy is critical. 

A-Series mechanical format  

Aligns mechanically with other A-Series Alphasense sensors, easing mechanical integration in shared housings.