Siemens OXYMAT 64 Operating Instructions Manual page 94

Operation
5.4 Operating functions
If you previously configured a relay output to "Maintenance request" using function 71, the
device outputs the changes in the zero point or the span with respect to the last calibration
as "Maintenance request".
Note
In order to be able to use this function, "Total calibration" (function 23) must be activated.
With
smallest span in %.
With
current span in %.
The calibration tolerance, which can be set from 0 to 99 %, refers to the measuring range
with the smallest span in the case of the zero point, and to the measuring range where the
total adjustment is carried out (marked with "■" in function 22) in the case of the span.
Example
Measuring range 1
Measuring range 2
Leading measuring range in which calibration
takes place
Selected calibration tolerances
Response threshold for zero point
Response threshold for span
If the zero / span deviates by more than the parameterized value compared to the last
calibration, and if "Signal tolerance violation" is activated, the corresponding relay signalizes
a maintenance request.
See also
Total / single calibration (function 23) (Page 57)
92
"Calibration tolerance at zero point ..."
"Calibration tolerance at span ..."
, you define the max. deviation proportional to the
, you define the max. deviation proportional to the
0 to 100 vpm O
0 to 1000 vpm O
Measuring range 2
6% (zero); 10% (span)
100 vpm O x 0.06 = 6 vpm O
2
1000 vpm O x 0.1 = 100 vpm O
2
Operating Instructions, 06/2008, A5E00880383-03
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2
2
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OXYMAT 64