Inficon 550-300A, Operating Manual

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6-3
Operation
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6.4 Control commands
The following control commands can optionally be sent to the Modul1000 to the
control unit / remote control via the PLC control inputs or via the RS232 interface.
START
If the control unit is connected, the LED in the START-button will flash during the
evacuation process.
During the measurement, it will light up continuously.
If the START button on the control unit is pressed during the measurement, the maxi-
mum leak rate display will be enabled (Hold function). This is the highest leak rate
which has been measured since the start.
If the START button is repeatedly pressed, this Hold function will be initialized.
The LED in the button indicates the status:
By pressing the START button, the Modul1000 starts to evacuate the connected test
sample.
If the pressure on the inlet of the leak test device reaches < 0.4 mbar, the Modul1000
will automatically switch over to the Measuring mode.
This pressure limit can be set in the following menu:
Settings
o
Monitoring
o
Pressure limit for the vacuum area
STOP / VENT
The STOP command stops the measurement and the leak test device switches over
to the Standby mode.
If you press the STOP button briefly, the measurements are interrupted.
If the button is pressed longer, the inlet is vented according to the conditions defined
in the menu "Vent delay".
LED ON: Inlet vented
ZERO
Pressing the ZERO button activates the background suppression. To disable the
background suppression again, it will be enough to keep the ZERO push button
pressed for about 3 seconds.
The status of the ZERO-button is indicated by the LED:
LED ON: ZERO enabled
Notice:
The ZERO function should be started only when the background signal is
stable. In the I•ZERO setting, the ZERO function can be used only then
when the dropping background signal becomes constant.
LED flashes: Evacuate
LED ON: Measuring operation: