Mettler Toledo M400 Guide Rapide page 24

20.9
B
%V O2
20.9
B
%Trm
Ain 4mA = 0.000 °C
Ain 20mA = 250_0 °C
20.9
B
%V O2
20.9
B
%Trm
Temperature=Fixed
20.9
B
%V O2
20.9
B
%Trm
Temperature=320.0 °C
20.9
B
%V O2
20.9
B
%Trm
Pathlenght=00200 mm
24
u
If Fixed compensation is selected, the fixed temperature value with which the
m easurement signal will be calculated has to be keyed in manually. For the fixed
temperature, only °C can be used.
u
u
Last, select the initial optical path length corresponding to the probe length installed:
– 290 mm probe: 200 mm
– 390 mm probe: 400 mm
– 590 mm probe: 800 mm
u
This initial value is valid when instrument purging on the instrument and on the
process side is running. Depending on the process conditions and after the optimum
of the process purging flow has been found (see next chapter), this value may have
to be slightly adapted.
Setting the correct process side purging
The flow rate of the purging will affect the effective path length and consequently the
measurement value.