42/24-10 EN Rev. 9 Chapter 8: Gas Analyzer Calibration 8-A-5
Automatic Calibration, continued
Blocking
Automatic Calibration
The “Block automatic calibration” control signal is needed for blocking automatic
calibration:
Level High Level (12–24 V). Automatic calibration is blocked as long as the High
level is present. The next automatic calibration after switching to a Low
level will be started according to the initialized cycle time.
Input Digital input DI2 on Digital I/O Module – “Status signals/Externally
controlled calibration” standard function block application
Start Block Cancel
Controlled by interval
if “Activation” parameter
is set to “on”
if “Activation” parameter
is set to “off” or
with the “Block
Automatic Calibration”
control signal
by appropriate configu-
ration of the Cancel
Management parameter
(see page 8-B-3) or of
the Automatic Calibra-
tion function block
(see Technical Bulletin
30/24-200 EN)
Externally controlled
with the “Start
Automatic Calibration”
control signal
with the “Block
Automatic Calibration”
control signal
As per Interval-
Controlled Start
Manually activated
Automatic Calibration
Start, Block and
Cancel
with START with STOP
Automatic calibration of an analyzer module is impossible
• when it is operated with the test and calibration software TCT and
• during setting up system modules.
Message Display During automatic calibration an Autocal running message blinks in the
softkey line.
Waiting Period
Following Automatic
Calibration
If the Output Current Response parameter is set to Hold, current output is
halted for a specific time to allow the measurement value to stabilize after auto-
matic calibration.
This interval is:
Test gas → Sample gas purge time + 4 x T90 or
Test gas → Sample gas purge time + 1 x T90-1 + 3 x T90-2.
Calibration Data Setting the calibration data is described on pages 8-B-3 and 8-B-4.
Setting the time constant T90 is described on page 7-A-5.
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