Operation
5.11 Configuration
FIDAMAT 6-G
5-54
Operating instructions, 07/2006, A5E00478463
If you previously configured a relay output to "Maintenance request" with 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 the zero….", you define the max. deviation proportional to the
smallest measuring span in %.
With
"Calibration tolerance at span….", you define the max. deviation proportional to the
current measuring span in %.
The calibration tolerance, which can be set from 0 to 99 %, refers to the measuring range
with the smallest measuring 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 span.
Example
Measuring range 1...
5 to 100 ppm THC
Measuring range 2
20 to 200 ppm THC
Smallest measuring span
95 ppm THC
Leading measuring range in which calibration
takes place
Measuring range 2
Response threshold for zero
95 ppm THC x 10 % = 9.5 ppm THC
Response threshold for span
180 ppm THC x 10 % = 18 ppm THC
Now, if the zero point / span deviates by more than the parameterized value as compared to
the last executed calibration, and if "Flag if tolerance is exceeded" is activated, the
corresponding relay signalizes a maintenance request.
See also