CALIBRATION CHAIN VERSUS
STATIC WEIGHT CALIBRATION
- A Calibration
Chain is a single point calibration reference, that is it represents
only one flow rate. With our static weights we do a 20%, 40%, 60%, 80%,
and 100% calibration. Linearity is a confirmation of scale accuracy
and a quality installation.
- The variation
in belt tension under real load is not simulated by a calibration chain,
making it little more than an expensive and cumbersome static weigh
frame test.
- Static weights
are less expensive than roller chains. It is better to spend the money
on a quality weigh frame since a roller chain does not improve the scale.
- With a high deflection
conveyor structure and high deflection weigh frame the roller chain
would deflect the approach, retreat idlers as well as the weigh frame.
This is the only additional benefit of the calibration chain vs static
masses, namely it deflects the weigh frame and conveyor in a way similar
to live material. A calibration chain would more simulate the system
as it deflects under operating load. For an roller chain to be of benefit
it must extend over the approach and retreat idlers.
- The PSF4 weigh
frames are very strong, resulting in minimal deflection. We have found
static calibration to work very well and is much easier to apply the
weights because they are stored under the weigh frame.
- We have determined
the affect and extent of any belt influence by checking calibration
when belt is lifted and then in place. With our low deflection scale
we have not found a difference in calibration.
- Space is a consideration
with a roller chain calibration system.
- The accuracy of our system is the same for both methods of calibration.
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STORED IN PLACE CALIBRATION
MASS
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WEIGH QUALITY IDLER
SETS
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