INFICON Ecotec E3000 Multigas-Sniffer-Leak Detector Interface description - Manual (Page 14)

14
2 I/O Port
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Fig. 5: Calibration timing interval
A calibration process is started by setting the calibration input to HIGH after the sniffer
probe tip has been placed in front of a test leak. The ready signal will go to HIGH after the
calibration process has started.
If a calibration is started within the first 20 min after power on a warning is issued. The
ERROR output signal will go to LOW and the READY signal will go to HIGH (not ready). In
this case, a calibration will not be started until the CLEAR ERROR input signal is set to HIGH
(calibration will be started afterwards). Alternatively the calibration may be aborted by
setting the CALIBRATION ABORT input signal to HIGH.
When the calibration process has been started the Ecotec E3000 sets the CALIBRATION
STABLE output signal to LOW after the signal had enough time to stabilize. The sniffer
probe tip then needs to be moved away from the test leak and the calibration input needs
to be set back to LOW afterwards.
The CALIBRATION STABLE output signal stays LOW and is set back to HIGH when the
background signal also had enough time to stabilize. At this time the calibration will be
completed, the results of the calibration process will be shown on the main display for 3
seconds. After that the main display will go back into measurement mode. The READY
output signal will go back to LOW at that time.
In case of an error during calibration, the READY output signal will remain HIGH until the
error is erased by the CLEAR ERROR input signal. If ABORT is sent during a calibration
before the last edge of the CALIBRATION signal, the calibration process will be aborted.
Leak rate
Cal (Input)
Ready (Output)
Cal stable (Output)
Measurement
helium
Measurement
air