Operation
5.4 Operating functions
OXYMAT 64
92
Operating Instructions, 06/2008, A5E00880383-03
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
"Calibration tolerance at zero point ...", you define the max. deviation proportional to the
smallest span in %.
With
"Calibration tolerance at span ...", you define the max. deviation proportional to the
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
0 to 100 vpm O
2
Measuring range 2
0 to 1000 vpm O
2
Leading measuring range in which calibration
takes place
Measuring range 2
Selected calibration tolerances
6% (zero); 10% (span)
Response threshold for zero point
100 vpm O
2
x 0.06 = 6 vpm O
2
Response threshold for span
1000 vpm O
2
x 0.1 = 100 vpm O
2
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