High-Precision Digital Humidity and Temperature Sensing Element
HTE501
The digital humidity and temperature sensing element HTE501 offers an excellent measurement accuracy up to ± 1.8 % RH (incl. hysteresis) and ± 0.2 °C. The proven E+E sensor coating and the integrated constant current heater ensure a high level of reliability and durability of the sensing element even in harsh, dirty and condensing environments.
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
- Automotive industry
- Building automation
- Consumer electronics
- Home appliances
- Industrial automation
- Medical devices
- Smart home
- Wearable devices
- White goods
- Fuel cells
Measuring Humidity in Fuel Cells
Balancing humidity and temperature plays a significant role in the efficiency and service life of PEM fuel cells. This why these parameters need to be continuously monitored and controlled.
The highly accurate HTE501 sensing element, enables custom humidity and temperature measurement in the fuel cell. By doing so, it ensures that the polymer electrolyte membrane always has the best possible moisture level and improves the fuel cell's performance.
Learn more about humidity measurement in fuel cells »
Key Features
- Excellent measurement accuracy
- E+E proprietary coating
- Constant current heater
- I²C interface with direct 16 bit integer output
- 8-pin DFN package
- I²C interface with pin-selectable addresses
- Integrated I²C pull-up resistors
- Dew point calculation
- Excellent repeatability
Technical data
- Measuring range
- 0...100 % RH
-40...135 °C (-40...275 °F) - Accuracy
- up to ±1.8 % RH (incl. hysteresis)
up to ± 0.2 °C (0.36 °F) - Digital interface
- I²C
- Supply
- 2.35 - 3.6 V