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Thread: Temp Sensor

  1. #1
    Join Date
    Dec 2003
    Posts
    148
    I've got a 100k ohm duct sensor I'd like to install on a unit to get a DAT, we have SBT controls, and I think a standard sensor for that system is 1k ohm. Is there anything I can do to make my sensor work, or do I have to get a 1k ohm?
    Still learning....

  2. #2
    Join Date
    Apr 2005
    Location
    Montreal
    Posts
    35
    Depends on what type of controller from SBT you are talking about. TEC can accept a 100K sensor, and 10K. MBC can take it too if you have a 100K module.

  3. #3
    Join Date
    Dec 2003
    Posts
    148
    Today I pulled all the wire and installed the sensor, I found an unused AI in my MEC and landed the wires there. I created a new LAI point, then I selected Thermistor 100 KOhm from the menu and calculated slope/intercept. When I ran a point log on the point, I got an outrageous value... over 10,000F and it had *F*. I changed it to just about every sensor there was, and it kept telling me the point was Failed.... Why? Does this mean there is a break in my wiring, did I wire it wrong in the MEC, I'm really confused now... Tomorrow I'm going to put a meter on it and check it out, does anyone else have any ideas??? Thanks.
    Still learning....

  4. #4
    Join Date
    Apr 2005
    Location
    Inland Empire,CA
    Posts
    56
    Don't know much about MEC, but ALC has bird jumpers on the inputs for 4-20ma, 0-5vdc, and thermistor/dry contact. Jumper needs to set in right position. Is there a needed gain value on your thermistors? Just a thought.

  5. #5
    Join Date
    Apr 2005
    Location
    Montreal
    Posts
    35
    The standard MEC doesn't take 100K ohm sensors. Even if you can calculate a slope and intercept for it, it won't give a good reading, regardless of jumper position.

  6. #6
    Join Date
    Dec 2003
    Posts
    148
    Well, I got my hands on a 1 KOhm and moved the jumper in the MEC and everything worked great. Thanks for your help!
    Still learning....

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