7. Attentions of application
(1) Operating conditions
Applying the DHT11 sensor beyond its working range stated in this datasheet can result in 3%RH signal shift/discrepancy. The DHT11 sensor can recover to the calibrated status gradually when it gets back to the normal operating condition and works within its range. Please refer to (3) of this sec on to accelerate its recovery. Please be aware that opera ng the DHT11 sensor in the non-normal working condi ons will accelerate sensor’s aging process.
(2) Attention to chemical materials
Vapor from chemical materials may interfere with DHT’s sensi ve-elements and debase its sensi vity. A high degree of chemical contamina on can permanently damage the sensor.
(3) Restoration process when (1) & (2) happen
Step one: Keep the DHT sensor at the condi on of Temperature 50~60Celsius, humidity <10%RH for 2 hours; Step two:K keep the DHT sensor at the condi on of Temperature 20~30Celsius, humidity >70%RH for 5 hours.
(4) Temperature Affect
Rela ve humidity largely depends on temperature. Although temperature compensa on technology is used to ensure accurate measurement of RH, it is s strongly advised to keep the humidity and temperature sensors working under the same temperature. DHT11 should be mounted at the place as far as possible from parts that may generate heat.
(5) Light Affect
Long me exposure to strong sunlight and ultraviolet may debase DHT’s performance.
(6) Connection wires
The quality of connec on wires will affect the quality and distance of communica on and high quality shielding-wire is recommended.
(7) Other attentions
* Welding temperature should be bellow 260Celsius and contact should take less than 10 seconds.
* Avoid using the sensor under dew condition.
* Do not use this product in safety or emergency stop devices or any other occasion that failure of DHT11 may cause personal injury.
* Storage: Keep the sensor at temperature 10-40℃, humidity <60%RH.