Closed LuckyTriple7 closed 3 years ago
From https://forums.adafruit.com/viewtopic.php?f=22&t=108435:
The higher-than-100% output you're seeing is a side effect of the humidity sensor absorbing too much water during the fog.
The sensor assumes that its sense cap will produce a specific reading at a specific temperature and humidty level.. usually 70% humidity at 25C. A sense cap that's been exposed to too much water will produce a higher reading than expected at the reference temperature and humidity levels. Exposing the sense cap to long periods of 100% humidity (like fog) will pick up that kind of offset.
You have two options:
1) You can declare the sensor dead and get a new one.
2) You can try to recondition the sensor by putting it in a 120C oven for about an hour to evaporate all the water stored in the sense cap, then let the sensor sit in a container at 70% humidity and 25C temperature for 24 hours.
This isn't an issue related to ESPHome.
Thank you for the information. the sensor is in a greenhouse. The values above 100% occur at night. When the windows are opened in the morning, the values are correct again. I have created a filter which filters out the values above 100%.
I hope the code is correct
filters:
- lambda: |-
float MIN_VALUE = 1;
float MAX_VALUE = 100.0;
if (MIN_VALUE <= x && x <= MAX_VALUE) return x;
Nice to know!
It will certainly help others.
If you want, you can close this issue :)
Operating environment/Installation (Hass.io/Docker/pip/etc.):
HASSOS, HASS 2021.06.02
ESP8266 NodeMCU v3
ESPHome version: V1.18
Affected component: HTU21D Temperature+Humidity Sensor
Description of problem:
HTU21D reports Humidity above 100%. These are unrealistic values. Maximum humidity is 100%
Problem-relevant YAML-configuration entries:
sensor:
[08:18:28][D][htu21d:052]: Got Temperature=17.1°C Humidity=101.7%