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Operating Specifications
Measurement
Principle
Linearity Deviation
Repeatability
Zero Drift
Sensitivity Drift
Output Fluctuation
(2 σ)
Flow Influence
Associated Gas
Influence
Temperature
Influence
Air Pressure
Influence
Power Supply
Influence
Position Influence
Time
T
90
42/24-10 EN Rev. 9
The ZrO
cell measures the difference in the oxygen concentration between the
2
reference side (with air) and the measuring side (with oxygen traces).
Owing to the measurement principle, zirconium dioxide cells are base linear.
< 1 % of the measurement range or 100 ppb O
The zero point (reference point) is displayed if ambient air is present on the
sample gas side. The value for air of 20.6 Vol. % O
humidity) may deviate through aging of the cell.
< 1 % of the measurement range per week or 250 ppb O
Depends on possible interfering components (catalyst poisons) in the sample gas
and the aging of the cell.
For pure gas measurements in N
per week or 250 ppb O
2
< ±0.5 % of the measured value or 50 ppb O
≤ 1% of the measured value or 100 ppb O
8 ± 0.2 l/h.
The flow rate must be kept constant to ±0.2 l/h in the permissible range. The
permissible range is 5 to 10 l/h. The flow rate is kept constant to 8 ± 0.2 l/h with
integrated pump and flow control.
Inert gases (Ar, CO
, N
) have no effect. Flammable gases (CO, H
2
2
stoichiometric concentrations to the oxygen content: Conversion of O
the stoichiometric conversion. If higher concentrations of flammable gases are
present, higher O
conversions must be expected. The concentration of flamma-
2
ble gases in the sample gas must not exceed 100 ppm.
The effect of the ambient temperature in the permissible range of +5 to +45 °C is
< 2 % of the measured value or 50 ppb O
temperature (whichever is greater).
No effect through a change in air pressure; sample gas must flow out of the outlet
without back pressure.
24 V DC ± 5 %: no effect
No position effect for permanently installed instruments
T
< 60 s for the alternation of 2 test gases in the measurement range 10 ppm
90
with a sample gas flow rate = 8 l/h and electronic T90 time = 3 s (applies to an
analyzer unit with 1 analyzer module)
Appendix 3: ZO23 Trace Oxygen Analyzer Module
(whichever is greater)
2
, CO
and Ar: < 1 % of the measurement range
2
2
(whichever is greater)
(whichever is greater)
2
(whichever is greater) for a flow rate of
2
per 10 °C change in the ambient
2
(for 25 °C and 50 % relative
2
(whichever is greater)
2
, CH
) in
2
4
< 20 % of
2
A-3-9
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