Heavy tare to simulate high load in a routine sensitivity test of a floor scale?

#1
Hello,

I use a scale with a maximum capacity of 2000 kg, with 3 working ranges 500 kg/1000 kg / 2000 kg. This scale is used to weigh liquids in vessels, ranging from 15 to 1500 kg.

Based on risk, I want to implement a sensitivity check every few days and a corner load test every few weeks. My interpretation is that ideally, the sensitivity test should be performed with load of 1500 kg or 1000 kg (50% of 2000 kg, as per NIST handbook). However, it would be very difficult to perform this routine verification with the standard weights that I have available or by means of substitution test methods. The scale is and will continue to be calibrated annually, by a certificated company.

I already checked other topics here in the forum, like the "Daily weight checks of floor scales", but my doubt still remains:

I was wonder, if I use a vessel with >1000 kg (exact weight unknown) as a tare, set the scale to zero, and then use 5 x 20 kg = 100 kg standard masses on top of that to perform the sensitivy test, would the results be meaningful in some way? In other words, if the value read by the scale for those 100 kg (using the heavy tare as zero) falls within my acceptance criteria (the same as when I test the scale using the 100 kg of standard weights and nothing more), could I consider the scale as ok/ready to be used for weighing ~1000 kg?

If you have other sugestions, they are also welcome :)

Thanks in advance, best regards
 
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Jim Wynne

Staff member
Admin
#2
The tare weight is irrelevant. You're still just weighing the contents of the vessel. It's no different from just weighing the 100kg standards.
 

bpritts

Involved - Posts
#3
I agree with Jim. No reason to overcomplicate this.

We have a similar situation - we do liquid chemical blending by weight, so scale is critical. We have an annual full calibration including checks of repeatability, and a weekly confirmation. The scale capacity is 2000 lbs. We do a check with a 300 lb. test weight once each week to confirm.
 

dgriffith

Quite Involved in Discussions
#4
Hello,

...I was wonder, if I use a vessel with >1000 kg (exact weight unknown) as a tare, set the scale to zero, and then use 5 x 20 kg = 100 kg standard masses on top of that to perform the sensitivy test, would the results be meaningful in some way? In other words, if the value read by the scale for those 100 kg (using the heavy tare as zero) falls within my acceptance criteria (the same as when I test the scale using the 100 kg of standard weights and nothing more), could I consider the scale as ok/ready to be used for weighing ~1000 kg?

If you have other sugestions, they are also welcome :)

Thanks in advance, best regards
I believe this is the intent of HB44. Using a tare weight to evaluate the mid and upper range of the scale. It doesn't matter what the tare weight is (general estimate to be sure that you are getting into the scale range of interest, but exact weight not needed), zero the scale and apply the test mass again. The delta should be 100 kg.
 
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