Tubes Handbook 18th Edition (EN) - May 2018

70| Dräger-Tubes & CMS-Handbook
Switch
Position
0
1
Function of the Analyzer
Device switched off
Switch on analyzer - analyzer immediately performs a complete self-test,
followed by the message „function test ok“, displayed for three seconds. Then
the message „insert chip“prompts the user to push the chip selected for the
measurement through the rear inlet flap into the analyzer. During this process
the analyzer receives information, in the form of a bar code printed on the chip,
which is relevant to the measurement: gas type, measuring range, flow and data
for the calibration curve.
The optical system calculates the
number of measurements still
available on the chip being used, and
displays the gas type and the mea -
suring range. Approx. 5 seconds later
the user is instructed to set the
switch to position 2.
Inserting the chip
ST-1243-2008
2
3
In this switch position the CMS automatically checks the air-tight integrity of the
entire gas conduction system, right up to the chip itself, in order to exclude the
occurrence of false measurements due to possible leakages. When the leak test
is complete, the switch can be moved to position 3 in order to start the actual
measurement process.
Start measurement, both ends of the capillary are open, the pump system pulls
ambient air through the measuring capillary of the chips. A bar indicator in the
display shows that the measurement is active, until the result of the
measurement appears in the display.
In order to take another test with the same chip, the switch can be moved to position
2 and a new leak test will be conducted.
In order to replace the chip the switch is returned to position 0, the outlet flap opens,
the chip is ejected automatically, and the chip can be easily removed.