60 EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A
Test gases
Dew point of the test gases
The dew point of the test gases (see page 24) must be approximately the
same as the dew point of the sample gas (see page 21), i.e. it must be at
least 5 °C lower than the lowest ambient temperature in the overall gas path.
Test gas flow
The test gas flow should be 30 to 60 l/h ± 5 l/h.
Test gas infeed
The test gas must be connected at the sample gas inlet of the gas analyzer:
• either by means of an external solenoid valve, which is controlled via
digital output DO4 on digital I/O module 1 (see page 39) (standard con-
figuration),
• or by means of three external solenoid valves for sample gas, zero ref-
erence gas and span gas, each of which is controlled via an appropriately
configured digital output (see page 39),
• or by means of a multidirectional cock.
Test gas infeed for automatic calibration
The prerequisite for the automatic calibration procedure is that at least one
external solenoid valve is installed, which is controlled via an appropriately
configured digital output.
Especially in situations where the automatic calibration is executed as a
simplified calibration, the test gas required for that purpose (zero-reference
gas or air or standard gas) has to be connected to an external solenoid valve.
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