How to test relative humidity sensors

In this video, we talk about how you can evaluate a relative humidity sensor by using the atmosphere of a solution saturated with table salt (sodium chloride). The expected humidity at 20C (68F) is 75.5% and 75.3% at 25C (77F).

We test a DHT11 sensor and show that it behaves in line with the expected accuracy of the sensor +/- 5%. Given the frequent deterioration of DHT11 sensors, this is a good method to test sensors routinely and confirm their accuracy.

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[muhammadammar]

Thankyou so much for this awesome video 🤩🤩.. can you please recommend me a humidity sensor for radiosonde. As it goes up in the air upto kms. so a sensor is required which can bear this harsh enviroment.

[HerbNerd]

You should make a CO2 sensor with the rasphberry pie build

[Trymon]

I should also do this test, my sensor is just an entirely different beast.
I'm using a HYT221. Bought this to have a reference for my Termometers and Hygrometers. While not used in Hydroponics I need good readings for my Guitars. :D
HYT221 has a temperature reading of +/- 0.2C and +/-1.8%
Have to admit that I'm surprised by my Hygrometers. The devices themselve are way cheaper thatn just the sensor but they are luckily very close. Temperature basically spot on and humidity just 1% difference.
But just for fun I will also connect the DHT11 to the Arduino so I can see both sensor readings. Might be very interesting.

[ross]

Thanks for this! Great channel, heard you on Garden Talk, trying to absorb your content before going into my second grow.

[canyonlewis]

How can I look up a chart showing the relative humidity vs temp for a closed chamber salt water environment?

[rodgersandrodgers]

An interesting video. Thank you. You have told me what you would not recommend, but what relative humidity sensor would you advise me to purchase?

[nertia]

Any experience with the DHT20 temperature/humidity sensor? Supposed to be the update/upgraded version of the DHT11/22

[funderspunder]

Hey, i had a quick question. The sonsor for my inkbird is covered in a black plastic shell and i notice that the humidity in my tent is lower inside than outside of it when the light is on and they become equal when the light is off. Could this be because my grow light is heating the sensor and causing it to believe that the air temperature is higher?

[MausSpaece]

9:13 What sensor(s) would you recommend for monitoring temp/humidity in a hydroponic environment?

[GetRealwithMike]

That's humidity, not relative humidity. The DHT22 measures Relative Humidity.