Calibration Room Environmental Condition Requirements

J

jfgunn

#11
My thought would be that you do not need a new thermostsat, but you need a new heating / cooling system. Most systems are not desgned to go from hot to cold or vice versa.

I would suggest one of the following (depending on the size of the room, how accurate you want to be, and how much money you want to spend)

Option 1: (Really accurate and really expensive) Get a precision cooling system that use electric reheats. This is basically an air conditioning system that constantly pumps cool air into the room. The thermostat then pumps in heat to keep the temperature constant. We have a syatem made by Liebert that keeps the temperature at 68 +/-1F in a room that is 20 X 20. This syatem was about $20K to buy and install including changing all of the celining tiles to create a vapor barrier so we could gontrol humiidty as well.

Option 2: Get an air conditioner and mount it in the wall where it blows the cold air into your room and exhausts somewhere else. Depending on the size of the room , this could be up to $1K. Basically, the air conditioner runs all day to varying degrees to fight the normal heating and cooling in the building.

Hope this helps
 
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Hershal

Metrologist-Auditor
Staff member
Super Moderator
#12
It depends on the calibration being performed.

For dimensional calibration, the norm is 20 C, +/- 2 C; 20% to 50% RH is allowable, but tighter control of RH is highly desirable.

For electrical calibration, the norm is 23 C, +/- 3 C; 40% to 60% RH is perferable.

In electrical measurements, anything below 20% is considered ultra-low RH and the static electricity has the potential to affect calibrations.

In dimensional calibrations, above 50% is considered to have a potential negative influence to the UUT.

You may also look at wind, dust, vibration, and other environmental influences if they exist where you are.

Hope this helps.
 
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