System Description
Installation and Operation Manual - ENSITU
®
7000
4 Doc.-ID: ENS_13062019-EN
1.2 Measuring Principle
The ENSITU
®
7000 O
2
probe is installed in a duct to measure O
2
in non-combustible process
gases and is coupled with an electronic unit for voltage and signal processing.
The oxygen sensor 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, 20.95 % O
2
dry) 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 partial pressure within
the process gas, whereby the O
2
concentration is determined in the process gas. Gas-tight
separation of reference air and process gas is of particular importance.
Should combustible components such as CO or H
2
be present in the sample gas, they will react
with oxygen at the sensor surface and can reduce the measured value.
1.3 Intended use
Info
The ENSITU
®
7000 analyzer system is a system for measuring the oxygen concentration in flue
gases and other non-combustible gases. For reasons of safety and the possibility of accidents,
unauthorized conversions and modifications of the system are prohibited.
Warning
The system cannot be used to determine the oxygen concentration of combustible gases or in a
location where combustible gases are present as the sensor temperature of 800 °C could
present an explosion hazard!
Info
The minimum concentration of O
2
in flue gas should under normal process conditions, not be
less than 0.5 %.
Caution
Under no circumstance should the measuring probe be directly connected to the 230 V / 115 V
main power supply as this will immediately destroy the probe heater element!
1.4 Safety Hazards
Warning hot surface
During operation, the temperature of the probe filter head and of other parts exposed to flue gas
is up to 800 °C (1472 °F). Direct contact with the hot parts when dismantling or maintenance will
cause severe burns!
The probe may only be removed with heat-insulated gloves. Before removing the probe, always
switch off the supply voltage. After removal, store the probe in a safe, protected place and wait
until it has cooled down below 35° C (95° F).
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