[Hai-users] outdoor temp sensor adjustment

[Robert Surtees]

Subject: [Hai-users] outdoor temp sensor adjustment

I think this was discussed here before, but I can't find it.....




-----Original Message-----
From: Ken Schumm [mailto:kwschumm at qsolv.com] 
Sent: Friday, February 14, 2003 9:56 AM
To: Tim Duckworth
Cc: hai-users at celery.tssi.com
Subject: Re: [HAI Users] Temperature sensor location

Previously, you (Tim Duckworth) wrote:
> How did you calibrate the sensor?  Is there a setting where you can apply
a fixed offset from the actual sensor reading or is this is mechanical
calibration?

Here is the calibration information I have gleaned from this
mailing list over the last few years. Scott Dudoussat from HAI
supplied this information.

First of all, if you pop the cover on the sensor there is a
potentiometer that can be adjusted with a small screwdriver.
That is how you make calibration changes. There are two ways
to calibrate the sensor, one requiring a frequency meter the
other is trial and error.

If you have a frequency meter, you can measure the output of the
sensor. To pick the required frequency at a given temperature use
this formula:

> FREQUENCY  =  (4 * TEMPERATURE)  /  30
> 
> Example:
> 
> Using the thermometer, if the ambient temperature is 75 degrees:
> 
> FREQUENCY  =  (4 * 75)  /  30
> FREQUENCY  =  300     /  30
> FREQUENCY  =  10 Hz
> 
> 73o 9.73 Hz - 9.86 Hz
> 74o 9.87 Hz - 9.99 Hz
> 75o 10.00 Hz - 10.12 Hz
> 76o 10.13 Hz - 10.26 Hz
> 77o 10.27 Hz - 10.39 Hz
> 
> The current version of the temperature sensor does not read below 0
> degrees F.

If you don't have a frequency meter, use this trial-and-error
method.

> The temperature is
> updated by the controller every 30 seconds.  After you make a change,
> wait at least 60-90 seconds for a proper reading by the controller.
> Turn the potentiometer clockwise (in small increments) to "lower" the
> temperature.  Turn the potentiometer counter-clockwise to "raise" the
> temperature.

There ya go! Good Luck!




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