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Terminology
There are some inconsistencies between the terminologies
used when calibrating/adjusting/trimming traditional analog in-
struments and new fieldbus instruments.
For both instrument types, the procedure has three phases:
The leftmost picture below presents the terms used when cali-
brating analog instruments. The rightmost one shows the
terms used in fieldbus instruments and fieldbus control system
software. The numbers of the three phases are shown in the
middle.
n o
For analog instruments the term "Calibration" is used for
comparison phases (1
ment" or "Trimming".
In the user interfaces and manuals of fieldbus instruments and
fieldbus control system software, the second phase is called
"Calibration", "Adjustment" and/or "Trimming". So, to avoid
confusion Beamex uses the term "Verifying Calibration" for
the comparison phases in fieldbus environment.
General
User Guide – MC5-IS Fieldbus Option for PROFIBUS PA
1. Comparing the instrument against a more accurate de-
vice (calibrator). This documents the instrument's state
"As Found". If all is well (instrument is accurate enough),
nd
rd
the 2
and 3
2. Adjusting/trimming the instrument.
3. Re-comparing to create an "As Left" document of the in-
strument's state after adjustment/trimming.
S t a r t
C A L I B R A T I O N
A s F o u n d
N e e d o f
y e s
A d j u s t m e n t ?
A d j u s t m e n t /
T r i m m i n g
E r r o r
n o
S m a l l
y e s
E n o u g h ?
C A L I B R A T I O N
phase are not needed.
1
n o
2
3
A s L e f t
E n d
st
rd
and 3
). Phase two is called "Adjust-
S t a r t
V E R I F Y I N G
C a l i b r a t i o n A s F
N e e d o f
A d j u s t m e n t ?
y e s
( C a l i b r a -
t i o n )
C A L I B R A T I O N
E r r o r
n o
S m a l l
y e s
E n o u g h ?
V E R I F Y I N G
C a l i b r a t i o n A s L
E n d
11
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