Siemens FIDAMAT 6 Operating Instructions Manual page 47

4.3 Start-up and operation
Check
Switching on
mains power
Warming up
4.3.1 Measuring ranges
Measuring ranges and
measuring spans
Setpoint value of zero point
Calibration of zero point
FIDAMAT 6 gas analyzer
Operating manual – A5E00222135-01
Before switching the unit on, check to see that hydrogen, combustion air, zero
gas and test gas are connected and the required pressures are present.
Shortly after switch-on, the measured value display appears on the LCD
screen. Above this, on the top line, is the status display (Section 5.1).
With the FIDAMAT 6 it is necessary to wait for about one hour for the
warming-up phase to finish. During this time, the oven heats up to 200°C
(accessible via function 2 "Diagnostics values"). In contrast, the
measuring cell and FID are warmed up with a delay whereby their
temperature derives from the setpoint temperature of the oven. Next, the
unit automatically checks in turn to see whether the corresponding
pressure of the sample and combustion air obtains and whether the
hydrogen supply is adequate. If this is the case, the flame is ignited
automatically. The flame burns when the flame temperature is 20°C
higher than the oven temperature.
Not until the unit has detected that the flame is burning will the pump be
switched on.
So as not to block the automatic heating-up procedure, the unit must be in
its measurement state. Here the current operational status can be read off
from the bottom line.
The measuring spans desired (initial value of measuring range and final
value of measuring range) should be defined using function 41. Analog
current values 0/2/4 mA to 20 mA are assigned to the initial and final
values.
If the same values are assigned for a measuring range's initial and
starting values this measuring range will be deemed non-existent.
The smallest measuring span (MS) is to be assigned to measuring range
1, and so on. In general, the following arrangement will apply: MS1 < MS2
< MS3 < MS4
The setpoint value for the zero point is entered under function 22. It
applies to all measuring ranges.
Zero calibration is carried out with the aid of function 20. Here both the
setpoint value and the actual value are displayed.
Start-up
4-5