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Hi
I am using SHD100-T to measure Temperature & Relative Humidity in return air duct along with ASB-36.
I was frustrated because of too much fluctuations in relative humidity readings, where as Temperature reading was very stable.
Initially I thought it is because of EM interference of AHU motor cables, hence I changed the sensor cable route (and used twisted pair, shielded cable). I did the wiring of the ASB-36 as per its installation sheet.
Also added threshold of 1% in input configuration. but there was no improvement.
I also tried by replacing the sensor with new one, but it didn’t work.
I observed these fluctuations when I increse the Fan speed.
At last, I used the same sensor by removing its metal cap, and I didn’t expect it, but surprisingly the problem solved. And Now I am getting stable readings.
Now I am curious to know the purpose of this brass metal cap, is it just meant for the protection of sensing element ?
Are the flucutions in the RH readings is the because of turbulent air flow in the return air duct ?
Will it give wrong readings if I used the sensor without cap ?
What is the correct location to mount the duct sensor (sidewall or top) ?
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