Commissioning
4.3 Commissioning and operation
FIDAMAT 6-G
4-10
Operating instructions, 07/2006, A5E00478463
Zero setpoint
Enter the zero setpoint in function 22. This applies for all measuring ranges.
Zero calibration
The zero is calibrated using function 20. Here, the device shows both the setpoint as well as
the actual value.
Electronically suppressed zero
When the start-of-scale value of the measuring range (ppm, %vol, etc.) does not lie at zero
concentration, one speaks of measuring ranges with a suppressed zero, e.g. 200 – 300 ppm
CO. Here, 200 ppm is the start-of-scale value, 300 ppm the full-scale value, and the
measuring span is 100 ppm.
Channels with electronic zero suppression are physically identical with non-suppressed
zeros. They only differ in the parameterization of the measuring ranges and the setpoints for
the suppressed zero (e.g. 200 ppm CO). The characteristic is stored from zero to the
characteristic full-scale value (in accordance with the type plate). You can reparameterize
non-suppressed zeros by changing these parameters later to suppressed zeros (functions
22 and 41). Observe, however, that influences, such as noise, temperature and pressure
errors increase by a factor of
F = (full-scale value of smallest measuring range) / (full-scale value of smallest measuring
range - start-of-scale value)
"F" should not exceed the value of "7" here. In general, we recommend that the smallest
measuring span not be increased by more than approx. 30%.
Span setpoint
Check the span setpoint with function 22.
The displayed setpoint must agree with the test gas value. If this is not the case, make them
agree with function 22.
Select the leading measuring range with "Total calibration".
The setpoints must lie as far from the zero as possible (at least 60% of the respective full-
scale value). Provide the corresponding test gases for the span calibration. Enter the
setpoints using function 22.
Change measuring ranges
The linearized characteristic for the largest measuring range (according to the type plate) is
stored in memory. If the largest measuring range (function 41) is changed, this full-scale
value must not be exceeded.
The smallest measuring range (according to the type plate) must not be fallen short if, since
in this case, noise and temperature influences on the measured value will increase relative
to the measuring range, which would impair reproducibility and worsen the drift behavior.
See also
Setting setpoints (function 22) (Page 5-15)
Define measuring ranges (function 41) (Page 5-26)