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Issue with HIH-3610-003

Discussion in 'Electronic Basics' started by Mikel Beck, Jun 11, 2004.

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  1. Mikel Beck

    Mikel Beck Guest

    I've got a Honeywell HIH-3610-003 humidity sensor. I have a 5V voltage
    regulator that feeds it. I measure the voltage right at the input for
    the sensor, I get 4.97V. The output of the sensor is about 15-20%
    lower than it should be.

    In a room (darkened) with a relative humidity of around 65%, the
    sensor reads 48-52%. I can read the output voltage from this sensor
    with a meter, it's putting out around 2.1V.

    Outdoors, with the sensor covered (to keep it in the dark), it has
    been around 75% humidity. The sensor reads 58-64%.

    Am I missing something obvious here? Any help would be appreciated.
     
  2. THose sensors may not be all that accurate. A microprocessor could easily
    compensate for any proportional kind of offset.
    The light sensitivity is not all that extreme IMO... you will see a jump
    if you point a flashlight at it or expose it to direct sunlight.
    How much current are you drawing?
     
  3. Read the comment line on the data sheet:
    http://catalog.sensing.honeywell.com/datasheet.asp?PN=HIH-3610-003&FAM=humiditymoisture
     
  4. Not one of my more helpful posts. Sorry.
    I would not expect this device to give best accuracy unless in
    complete darkness (not just darkened).

    Relative humidity is extremely sensitive to temparature. The slight
    rise caused by your having handled the parts a few minutes earlier or
    the small rise caused by the heat from the voltage regulator or sun
    shining on the light shield (or any other radient energy) can lower
    the relative humidity reading.
     
  5. Mikel Beck

    Mikel Beck Guest

    THose sensors may not be all that accurate. A microprocessor could easily
    According to the datasheet, this sensor should be accurate to +-2% RH.
    I'm off by more than that.
    Right, that's why I keep the sensor in the dark.

    Any ideas as to what's going on?
     
  6. Mikel Beck

    Mikel Beck Guest

    Not one of my more helpful posts. Sorry.

    Quite alright.
    Complete darkness? That's kind of bizarre. Who would make a sensor
    that has to be kept in complete darkness to be accurate?
    I'm going to bring the sensor into my garage after sundown, close up
    all the doors. That's as close to complete darkness as I can get. I'll
    see what it has to say in that environment.
     
  7. All silicon is light sensitive, but most is encapsulated in black
    epoxy. This device needs to have access to the air to sense
    humidity. That also allows light in.
     
  8. Mikel Beck

    Mikel Beck Guest

    Any suggestions for a humidity sensor that doesn't have to be kept in
    complete darkness? Anybody have any experience with the Sensirion SHT
    sensors?
     
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