ABB EasyLine EL3020 Datasheet

10 EasyLine EL3000 Series Data Sheet 10/24-4.10 EN Rev. 9
Trace oxygen analyzer ZO23
Measurement principle
Potentiometric measurement; zirconium dioxide cell for
determination of the oxygen concentration in accordance with
Nernst’s equation; reference gas: ambient air.
The analyzer is used for the continuous measurement of oxygen
in pure gases (N
2
, CO
2
, Ar). The measuring cell is catalytically
inactivated to the extent that flammable carrier components in
stoichiometric concentrations only negligibly reduce the oxygen
value.
Sample component and measurement ranges
Sample component
Oxygen (O
2
)
Measurement range quantity and limits
2 measurement ranges
Measurement ranges are freely adjustable within the 0–1 ppm
to 0–250,000 ppm O
2
range; they are factory-set to 0–1/
0–10 ppm O
2
.
The following measurement data refer to a measurement span
of 100 ppm O
2
with a regulated flow rate of 8 ± 0.2 l/h.
Stability
Linearity
Owing to the measurement principle, zirconium dioxide cells
are base linear.
Repeatability
< 1 % of the measurement range or 100 ppb O
2
(whichever is
greater)
Zero drift
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. of O
2
may deviate through aging of the cell.
< 1 % of the measurement range per week or 250 ppb O
2
(whichever is greater)
Sensitivity drift
Depends on possible interfering components (catalyst
poisons) in the sample gas and the aging of the cell.
For pure gas measurements in N
2
and Ar:
< 1 % of the measurement range per week or 250 ppb O
2
(whichever is greater)
Output fluctuation (2 σ)
< ±0.5 % of the measured value or 50 ppb O
2
(whichever is
greater)
Influence effects
Flow effect
≤ 1% of the measurement span or 100 ppb O
2
(whichever is
greater) for a flow rate of 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 5–10 l/h.
Associated gas effect
Inert gases (Ar, CO
2
, N
2
) have no effect. Flammable gases
(CO, H
2
, CH
4
) in stoichiometric concentrations to the oxygen
content: Conversion of O
2
< 20 % of the stoichiometric
conversion. If higher concentrations of flammable gases are
present, higher O
2
conversions must be expected. The
concentration of flammable gases in the sample gas must not
exceed 100 ppm.
Temperature effect
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
2
per 10 °C change in the ambient temperature (whichever is
greater).
Air pressure effect
No effect through a change in air pressure; the sample gas
must flow out of the outlet without back pressure.
Power supply effect
24 V DC ± 5 %: no effect
Position effect
No position effect for permanently installed instruments

ABB EasyLine EL3020 Specifications

General

Brand	ABB
Model	EasyLine EL3020
Category	Measuring Instruments
Language	English