10/24-4.10 EN Rev. 9 EasyLine EL3000 Series Data Sheet 11
Trace oxygen analyzer ZO23
Dynamic response
Warm-up time
The operating temperature of the cell is reached after approx.
15 minutes. Offset calibration with reference gas (ambient air)
after 2 hours flow. The measurement is ready-to-run after
valves and lines have been purged with sample gas. Typical
purging time for valves and lines: approx. 2–5 hours.
90% response time
T
90
< 60 sec for the alternation of 2 test gases in the measure-
ment range 10 ppm with a sample gas flow rate = 8 l/h and
electronic T90 time = 3 sec
Calibration
Offset calibration
The reference value for ambient air is calibrated at 20.6 vol.-%
O
2
(for 25 °C and 50 % relative humidity) by means of ambient
air on the sample gas side.
End-point calibration
By means of test gas O
2
in N
2
(or in CO
2
or in Ar);
O
2
concentration in the measurement range, e.g. 10 ppm O
2
Function test
An extended response time or reduced sensitivity are dimen-
sions for the correct functioning of the measuring cell. The func-
tion test can be carried out by feeding the sample gas without
any additional test gases. On the basis of the progression of the
test, it can be assessed whether the reaction time of the sensor
lies within a specified tolerance. The function test is started
manually and lasts approx. 15 min.
Materials in contact with the sample medium
Analyzer
Zirconium dioxide cell: ZrO
2
, electrodes containing platinum;
dust filter (option): PP; flow sensor (option): on semiconductor
basis, nickel-plated brass
Gas lines and connectors
Stainless steel 1.4571 (SAE 316Ti), FPM and silicon hoses in
the gas outlet; gas connections: stainless steel 1.4401
(SAE 316)/ 1.4305 (SAE 303)
Gas inlet conditions
The analyzer must not be used for measurement of ignitable
gas/air or gas/oxygen mixtures.
Temperature
+5 to +50 °C
Inlet pressure
p
e
= 2–20 hPa
Outlet pressure
Atmospheric pressure
Flow rate
5–10 l/h. The flow rate must be kept constant to ±0.2 l/h in this
range. The sample gas must be taken from a bypass at zero
pressure.
Corrosive gases
The presence of corrosive gases and catalyst poisons, e.g.
halogens, gases containing sulfur and heavy-metal dust, leads
to faster aging and / or destruction of the ZrO
2
cell.
Flammable gases
The analyzer is suitable for measuring flammable gases in
general purpose environment (see page 16). The concentra-
tio
n of flammable gases in the sample gas must not exceed
100 ppm.
Purge gas
If case purging is selected, purging may only be carried out
with air (not with N
2
), since the ambient air is used as a
reference gas.
Gas connections
See page 23
No
te
The gas analyzer cannot be used in combination with the
integral gas feed.
To Next Page
Loading...
Need help?
General
