System Description
Installation and Operation Manual - COMTEC
®
6000
6
Doc.-ID: COM6000_11022020_EN
1.2
Measuring Principles
The COMTEC
®
6000 O
2
/ CO
e
analyzer system consists of an in-situ probe which is installed in a duct to measure
non-combustible process gases and of an electronic unit for voltage and gas supply, as well as for signal processing.
The O
2
sensor of the COMTEC 6000 is at the tip of the probe and is regulated to 800 °C and works on the zirconium
oxide principle of measurement. Here, a mV signal between the reference gas side of the sensor (inside, instrument
air 20.95% O
2
) and the measured gas side is measured, which depends logarithmically on the ratio of oxygen partial
pressures on both sides of the sensor. The mV signal is converted according to the Nernst equation into oxygen par-
tial pressure within the process gas, whereby the O
2
concentration is determined in the process gas. Gas-tight sepa-
ration of reference air and process gas is of particular importance.
The CO
e
sensor at the tip of the COMTEC
®
6000 probe detects combustible, gaseous molecules whereby the meas-
ured value corresponds to the CO equivalent (CO
e
= CO equivalent). This value can be used as an indication of the
combustion efficiency. A high CO
e
value correlates with poor efficiency because a portion of the fuel is not completely
oxidized.
The InSitu sensor is in contact with the sample gas with both electrodes. These catalytically active electrodes cause
oxidation of the non-oxidized gas molecules, so that a voltage is generated between the electrodes, which depend on
the CO
e
concentration. Thus CO, H2 and C
x
H
y
(Hydrocarbons) can be measured.
1.3
Intended Use of COMTEC 6000
Info
ENOTEC InSitu analyers measure in flue gases of combustion plants or in comparable inert gas
mixtures. If oxidizable gas components are contained in these processes, contact ENOTEC..
Info
The COMTEC 6000 InSitu Analyzer System is a system for measuring the oxygen concentration and
the concentration of CO
e
in flue gases. For reasons of safety and the possible occurrence of accidents,
unauthorized conversions and modifications of the system are prohibited.
Warning
The COMTEC 6000 analyzer system may not be used to determine the oxygen content in combustible
gases or be used in the vicinity of combustible gases. Doing this will cause a risk of explosion.
Info
The minimum concentration of O
2
in flue gas should, under normal process conditions, not be less than
0.5%.
If a reducing atmosphere of less than 0,5% O
2
regularly occurs, ENOTEC recommends
CSP
(Cell Surface
Protection) for lasting protection of the measuring cell. (CSP is optional)
Info
The CO
e
sensor requires a minimum O
2
concentration for correct measurement.
If the O
2
concentration falls below this limit, the CO
e
measured value as well as the mA output rises up to
the highest possible value for the given measuring range.
Caution
Under no circumstance should the measuring probe be directly connected to the 230V main power sup-
ply, as this will immediately destroy the probe heater element!