Problems
with other Calibration Methods:
•
Electronic
signal Simulation: Fast, but does not apply load to scale.
•
Test
weight: Fast, loads scale mechanism.
•
Test
Chain (Weighbelt Feeders Only): Difficult to use, storage
can be a problem, time consuming.
•
Dead
Load (Loss of Weight Only): Difficult to use, storage can
be a problem, time consuming,
hard to handle for large feeders.
•
Material
Test: Time consuming, most comprehensive, but accuracy of
calibration is
subject to accuracy of sampling methods and accuracy of
scale used to weigh samples.
THAYER ATWL Features:
•
Auto
Zero Calibration.
•
Auto
span calibration with test load.
•
Auto
calibration and zero and span.
•
Auto
adjustment of zero and span errors.
•
History
of past calibration results stored in instrument for trending
and determination of required calibration interval.
THAYER ATWL Benefits:
•
Minimal
downtime for calibration checks.
•
When
automatic calibration check is carried out via a remote
computer or PC, human intervention
is not required. Eliminates operator error and institutionalizes
calibration checks at regular
time intervals for compliance with QA programs.
•
Eliminates
risk of operator injury from lifting and placing test weights.
•
Mechanically
exercises scale. Actually verifies load cell operation,
unlike an electronic shunt
calibration.
