Built-in verification can also
save a significant amount of
maintenance time and reduce the
need for unnecessary calibrations.
Figure 3 shows two instruments
(A and B). Instrument A (blue)
has to be recalibrated every six
months based on the manufacturer’s
B (orange) is equipped with
an embedded diagnostics and
verification system and is verified
bi-monthly by the means of an
automated diagnostics system. Due
to the higher test coverage of the
diagnostics system, Instrument B
requires wet calibration only once
every 2. 5 years. Instrument B is
generating 80 percent savings on
maintenance cost, while at the same
time achieving a significantly higher
confidence level than instrument A.
Wet calibrations are still the most
freqiently used method to check
an instrument and demonstrate
regulatory compliance. State-of-the-art instruments with embedded
verification capabilities offer the
chance to improve upon this practice.
Performing regular verification on
the instrument can extend calibration
cycles by a factor of five or higher
without jeopardizing quality or
regulatory compliance. Shorter
unknown periods between checks
lead to an increased confidence
level and reduced risk for critical
Figure 3: Calibration vs. verification.
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FDA-APPROVED/CERTIFIED MATERIALS OF CONS TRUCTION • 21 CFR PART 11 COMPLIANCE
MOBILE VACUUM CONVEYING SYSTEMS • CIP DESIGNS
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