Inficon Ecotec E3000, Technical Handbook

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7-6
Equipment Connections
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7.1.5 How to perform a calibration
An external calibration may be performed via the PLC inputs and outputs. For this
purpose, one of the inputs needs to be configured to "CAL", another needs to be set
to "CAL AIR" (for how to select PLC inputs see section 4.6.4). The external
calibration is always performed for the enabled gas with the highest gas no. The test
leak rate used is the test leak rate which has been used for the last external
calibration performed.
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.
Notice: 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.
Fig. 7-3
Leak rate
Cal (Input)
Ready (Output)
Cal stable (Output)
Measurement
helium
Measurement
air