Siemens FIDAMAT 6 Operating Instructions Manual page 49

4.3.2 Calibration
Zero calibration
Single and total
calibration
Calibration of zero point,
span
Examples of calibration
a) Detection of hydrocarbon in air
Measuring range:
Test gas:
Zero gas:
Procedure
Selection of measuring
range initial and final
values
Inputting setpoint value
for zero points and span
Calibration of zero point
Span calibration
FIDAMAT 6 gas analyzer
Operating manual – A5E00222135-01
Zero calibration is carried out with the aid of function 20. Here both the
setpoint value and the actual value are displayed.
Single calibration means that each measuring range is adjusted with its
own test gas. This is to be recommended when the changeover ratio of
the measuring spans exceeds 1:10.
With total calibration only the leading measuring range (function 22) is
adjusted; the other measuring ranges are "pulled in" via the changeover
ratio.
Total calibration can be activated or deactivated with the aid of function
23.
Next, select function 21 and carry out the calibration desired. In this
regard, note that this function cannot be selected unless AUTOCAL is
disabled.
Total calibration therefore means that all measuring ranges are adjusted.
With single calibration, the procedure described above has to be repeated
separately for each measuring range with the corresponding test gases.
(Under function 22 a test gas must be specified for each measuring
range!)
Apply zero gas or test gas to the unit at 30 – 90 l/ h (0.5 – 1.5 l/ min).
Note here also the input pressures on page 2-14. Zero point calibration is
carried out with the aid of function 20, span calibration with function 21.
0 - 20 ppm C
1
15 ppm methane in air
Synthetic air (free of hydrocarbons)
Function no. Input
41 0 – 20 ppm
Zero point:
22 Recommended:
20
21
Comments
0 ppm
Note input pressures
(see "Technical data" on page 2-14)
15 ppm
Start-up
4-7