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Automatic Calibration
Definition
Test Gas Supply
Test Gas Dew Point
Analyzer Modules
with Multiple
Detectors
Starting Automatic
Calibration
Internal Start
External Start
Manual Start
8-A-4
Automatic calibration means:
Zero and span calibration run automatically after starting.
The test gas supply can be started automatically by means of the gas module's
solenoid valves or via external solenoid valves.
Depending on the gas supply circuit and the number of analyzer modules installed
there are several test gas layout possibilities (see "Test Gas Supply Control for
Automatic Calibration" section, page 8-A-6).
The test gas dew point must be nearly identical to the sample gas dew point.
In analyzer modules with several detectors (e.g. the Uras26) all detectors are
calibrated simultaneously.
Automatic calibration is started
• At time intervals determined by the internal clock
• By an external control signal
• Manually via the gas analyzer's display and control unit
Normally automatic calibration is started on a time interval basis by the internal
clock.
The cycle time is initialized with the calibration data (see "Calibration Data for
Automatic Calibration" section, page 8-B-3).
The "Start automatic calibration" control signal is needed for external starting of
automatic calibration:
Level Low (0–3 V) → High (12–24 V) edge. The Low → High transition may also
be generated by an external contact. After the transition the High level
must be present for at least 1 second.
Input
Digital input DI1 on Digital I/O Module – "Status signals / Externally
controlled calibration" standard function block application
Automatic calibration can be started manually on the display and control unit. It is
effected
• Only as zero calibration or
• Only as span calibration (see also "Calibration Data for Automatic Calibration"
section, page 8-B-4) or
• As a common zero and span calibration.
Manual start of the automatic calibration of an analyzer module is described on
page 8-D-2.
Chapter 8: Gas Analyzer Calibration
Continued on next page
42/24-10 EN Rev. 9
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