All about sensors and solutions


Overview of the basic information and SOS electronic tips for CO2, VOC, humidity, temperature, liquid and gas flow sensors. If you are looking for a solution, Sensirion will not disappoint you.

Sensirion sensors measure reliably all the important environmental parameters such as relative humidity, temperature, the concentration of CO2, VOC and concentration of particulate matter. Sensirion also offers sensors for measuring liquid flow and the gas mass flow.

Environmental sensing

Relative Humidity and Temperature Sensors

Sensors are based on measuring the capacitance between electrodes placed in a porous polymer membrane. Water vapor penetrates into the membrane and changes the capacitance between electrodes.

You can find the sensor comparison in the table below.

The table is available in PDF format. 

Worth to Mention

STSx Sensors

The STS21 temperature sensor has the same parameters as SHT21 except for lower average current consumption 20uA because of T_meas=66ms instead of T_meas+RH_meas=66ms+22ms for SHT21. The sts3x temperature has the same parameters as SHT3x but they measure only temperature.

Sensors Lifecycle

SHT1x sensors are not manufactured anymore. You can, therefore, use SHT3x sensors. Migration requires PCB redesign because of the different package and SW changes since SHT3x uses I2C interface instead of S-bus.

SHT7x sensors were also discontinued. Please, use SHT85 instead. Migration requires SW changes because SHT85 uses I2C interface.

SHT2x and SHTC1 are in mass production. Even though there isn’t a plan to stop the production, we recommend using the SHT3x and SHTC3 for the new projects.

SHTW1 sensor is not manufactured anymore, please use SHTW2 (different package, PCB redesign is necessary).

Battery operation

Lithium (Lithium-thionyl Chloride) battery has a nominal voltage 3V (3.6V). The battery is fully depleted when the voltage drops to 2V (cut-off voltage). All RH&T and T sensors have low current consumption and can work from a battery, but:

  • SHT3X works in range 2.15 to 5.5V – can’t make use of full battery capacity
  • SHTC1, SHTW2 works in range 1.62 to 1.98 – they need voltage regulator and I2C level shifter
  • SHTC3 works in range 1.62 to 3.6V – covers full battery voltage range
Evaluation kits

Sensirion offers modular evaluation kits that consist of SEK SensorBridge, SEK-SHT31 (SHT35, SHTC3, SHTW2)-Sensors, and freely downloadable software for visualization of measured data ControlCenter.

Automotive Grade Sensors

Sensirion´s SHT3xA and STS3xA sensors are today’s industry standard for humidity and temperature sensing in automotive applications. Their design and reliability are specifically optimized to meet the high-quality standards of the automotive industry.

Applications:

  • Climate control
  • Anti-fogging
  • RH/T condition monitoring for climatic management of critical electronics

Core values to the automotive market:

  • Meets quality requirements of the automotive industry according to IATF 16949 and AEC-Q100
  • High reliability, robustness and accuracy
  • More than 20 years of experience in the field of humidity and temperature sensing
  • Proven track record: the third generation of humidity sensors in the automotive sector

Metal Oxide Semiconductor CO2_eq and VOC Sensors

To read more, click here!


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