Calibration of Bulk Tank with Scale - Operating capacity is 3400lbs

M

mlthompson

#1
I have a bulk tank, with weigh scale, that needs calibrated. Operating capacity is 3400lbs. The current calibration method is to empty tank, tare and calibrate using increments of 100lbs up to 500lbs. I know that standard calibration practice should be to calibrate with increments upto 3400lbs, but the equipment structure itself doesn't have the space to load the tank with 3400 lbs of weights.

What calibration method would you propose?
 
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Jim Wynne

Staff member
Admin
#2
Re: Bulk Tank Calibration

I have a bulk tank, with weigh scale, that needs calibrated. Operating capacity is 3400lbs. The current calibration method is to empty tank, tare and calibrate using increments of 100lbs up to 500lbs. I know that standard calibration practice should be to calibrate with increments upto 3400lbs, but the equipment structure itself doesn't have the space to load the tank with 3400 lbs of weights.

What calibration method would you propose?
Do you use the full capacity?
 
M

mlthompson

#3
Re: Bulk Tank Calibration

Yes. We have considered the idea to tare, calibrate, add 1000lbs of chemical, tare, calibrate, add... repeat this until the capacity is maxed out. But I am concerned this won't verify gage linearity.

We have also considered the idea to tare, calibrate, add 1000lbs of chemical, and calibrate again without tareing, calibrate, add... But the chemical added becomes a calibration standard which may not be exactly 1000lbs.

Our calibration service feels that the 500lbs method is sufficient. I'm not convinced. Accurate scales are critical to recipe control when we blend chemicals.
 

BradM

Staff member
Admin
#6
Re: Bulk Tank Calibration

Actually, the idea of putting a certain volume of water is a pretty good idea. I would not have thought of that. You could use a calibrated flowmeter and measure the amount of water going into the tank. Use that as your standard.
 
#7
Re: Bulk Tank Calibration

Use an instrument that is calibrated to a national standard to measure the water weight of the water supply you use.
 

BradM

Staff member
Admin
#8
Re: Bulk Tank Calibration

I am still trying to figure out your setup here. Is this tank on load cells? Or, is it permanently affixed to a scale? Like Jim asked, what capacity do you use this to will assist in determining how high you need to calibrate this.
 
M

mlthompson

#9
Re: Bulk Tank Calibration

Just considering the details, because I think the idea is great also. For folks who know more about water than I do...can the weight of water vary from water district to water district based on the amount of contaminants in the water?
 

BradM

Staff member
Admin
#10
Re: Bulk Tank Calibration

The weight of the water will depend on the specific gravity. Namely, the specific gravity with water is correlated to the temperature.

I guess all this depends on what requirements you have and how accurate you are expecting this to be.
 
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