4
Power Supply
(required for
pump unit only)
Pump or
regulated
air supply
Power Supply
Reference air
supply
mV Output from
Zirconia Cell
COMMANDER SR100B
3
INSTALLATION
Warning.
The probe operates at high
temperatures – take all necessary precautions to avoid
injury through burns.
Caution.
Thermal shock may damage the zirconia
cell if the flue is cleaned using a high pressure water hose.
If this method of cleaning is employed, remove the probe
from the flue prior to cleaning. Never use the probe without
the sheath.
3.1
Types of Measuring Systems – Figs. 3.1 to 3.3
When an oxygen concentration measurement is required, i.e.
%O
2
, ppmO
2
or O
2
partial pressure, temperature compensation
of the probe output is usually necessary.
If the process temperature is constant, or if variations in
operating temperature do not produce unacceptable errors, as
in some flue gas measurement, it is possible to measure O
2
concentration without temperature compensation using a
system similar to that for oxygen potential.
Systems for two types of measurement are shown in
Figs. 3.1 to 3.3.
In metal heat treatment applications oxygen potential is
normally measured and temperature compensation of the
probe output is therefore not required.
Full installation details for other units are given in their
respective instruction manuals.
Fig. 3.1 Oxygen Potential Measurement using COMMANDER SR100B Multipoint Chart Recorder
