EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D 117
Test gas supply
If the gas analyzer is equipped with a solenoid valve (‘Integral
gas feed’ option – only in model EL3020, not for Limas23, ZO23,
Fidas24), the test gas must be connected at test gas inlet 22 of
the solenoid valve.
Otherwise, the test gases must be connected to the sample gas
inlet of the gas analyzer:
• Either with an external solenoid valve controlled via
digital output DO4 on digital I/O module 1 (standard
configuration), see Digital I/O module on page 97.
• Or with external solenoid valves for sample gas, zero
point gas and span gas, each controlled via an
appropriately configured digital output, see Digital I/O
module on page 97.
• Or with a multi-way valve.
Test gas supply control for automatic calibration
The prerequisite for the automatic calibration procedure is that
• Either the gas analyzer is equipped with a solenoid valve
‘Integral gas feed’ option – only in model EL3020, not for
Limas23, ZO23, Fidas24)
• or at least one external solenoid valve is installed, controlled
by an appropriately configured digital output.
Especially in the case where automatic calibration is performed
as a simplified calibration (calibration cells, single-point
calibration), the required test gas (zero point gas, air or
standard gas) must be either applied to the built-in solenoid
valve or to an external solenoid valve.
Set test gas concentration
Menu path
‘ Setup / Calibration Data / Test Gas Set Points’
Figure 59: “Set points’ menu
Test gas concentration
The set points of the test gas concentrations for zero and end-
point calibration must be set separately for manual and
automatic calibration.
The set points of the test gas concentrations for the manual
calibration can also be set during the calibration process as well
as in the configurator.
Zero point set point
Value range: Initial value of the physical measuring range minus
20 % of the measuring span to the final value of the physical
measuring range.
Refer to Configuration on page 141.
End-point set point
Value range: Initial value of the physical measuring range up to
the final value of the physical measuring range plus 20 % of the
measuring span.
Refer to Configuration on page 141.
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