Humidity and temperature sensing element
Ideal for humidity measurement in fuel cells
High level of measurement accuracy, wide range of applications
The stated accuracy of the relative humidity measurement up to ±1.8 % (incl. hysteresis). Integrated hysteresis compensation ensures that the sensing element always keeps within its tolerance window, even when the humidity content rises or falls. With a temperature range of -40 °C to 135 °C, the HTE501 sensing element is suitable for a wide range of applications.
Suitable for demanding operating conditions
The active sensor surface is permanently protected against dirt and corrosive deposits by the proprietary E+E sensor coating. This special protective coating ensures excellent measurement performance and long-term stability even under demanding conditions. The sensing element can therefore be used in harsh environments without the need for additional protection.
The integrated constant current heater, which can be activated as required, keeps the sensing element at an excess temperature and thus prevents condensation and deposits caused by condensation.
Direct measured value output via I²C interface
The measured value output is based on the I²C data communication protocol. The measured values are available in 16 bit integer format and can be processed directly. In addition to the humidity and temperature values, the dew point is also calculated and output directly. 8 individually adjustable I²C addresses make it possible to operate several sensing elements on one I²C bus.
Simple design-in and evaluation kit
The DFN enclosure of the HTE501 measures only 2.5 x 2.5 x 0.9 mm. This makes the sensing element suitable for demanding designs and tight spaces. The integrated I²C pull-up resistors further facilitate design-in, as no external circuitry is required.
| HTE301 | HTE501 | |
| Measurements | Humidity, Temperature | Humidity, Dew Point, Temperature |
| Humidity range | 0…100 % | 0…100 % |
| Accuracy humidity | up to 1.8 % RH | up to 1.8 % RH |
| Integrated humidity hysteresis compensation | yes | yes |
| Response time humidity (typ. τ63% ) | 5 s | 5 s |
| Temperature range | -40…125 °C | -40…135 °C |
| Accuracy temperature | up to 0.2 °C | up to 0.2 °C |
| Response time temperature (min. τ63%) | 2 s | 2 s |
| E+E proprietary coating | yes | yes |
| Heater | up to 16 mW | up to 288 mW |
| Direct dew point output | – | yes |
| Alert output | yes | – |
| Reset Pin | yes | – |
| Supply Voltage | 2.35 – 3.6 V | 2.35 – 3.6 V |
| Interface | I²C, 16 bit unsigned integer | I²C, 16 bit signed integer |
| I²C pin selectable adresses | up to 4 | up to 8 |
| I²C Pull-up resistors (integrated) | – | yes |
| Measurement mode | Single shot (low power), periodic | Single shot (low power), periodic |
| Housing | 8-pin DFN package | 8-pin DFN package |
| Dimensions (L x W x H) | 2.5 x 2.5 x 0.9 mm | 2.5 x 2.5 x 0.9 mm |
| Packaging size (T&R) | 2,500 pcs. | 2,500 pcs. |
Typical Applications
