ABB AO2000 Series, Руководство по эксплуатации

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242 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Test gases
Zero calibration
Quality Synthetic air or catalytically purified air with an org. C
content of < 1 % span
Inlet pressure p
e
= 1000 ± 100 hPa
Flow rate 130 to 250 l/h
Span calibration
Components Sample component CH
4
: CH
4
in air
Sample component THC: C
3
H
8
in air or CH
4
in air
Substitute gas component (when configured per order):
CH
4
in air
Inlet pressure p
e
= 1000 ± 100 hPa
Flow rate 130 to 250 l/h
Converter effectiveness testing
Components CH
4
in air or C
2
H
6
in air (separate test gas containers),
connection via bypass
Inlet pressure p
e
= 1000 ± 100 hPa
Flow rate 130 to 250 l/h
Test gas concentration set points for span calibration
Sample component CH
4
Set point CH
4
= Test gas concentration CH
4
Sample component THC, calibration method "Test gas calibration"
Set point THC = Test gas concentration C
3
H
8
Set point THC = Test gas concentration CH
4
/ Response factor CH
4
Sample component THC, calibration method "Substitute gas cali-
bration"
Set point CH
4
= Test gas concentration CH
4
Zero offset
If the zero reference gas is not completely free of hydrocarbons (even puri-
fied nitrogen contains fractions of hydrocarbons), negative measured values
may be displayed in small measuring ranges (the process gas is "cleaner"
than the zero reference gas).
Test gas infeed
If the test gases are connected at the zero gas and span gas inlet, the test
gases are connected automatically by means of the integral valves.
If the test gas is connected at the sample gas inlet, the zero gas and span
gas inlets must be sealed.