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Operation Manual HORIBA APDA-371
Particulate Monitor
Date:
April, 2010
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HORIBA Europe GmbH, Julius-Kronenberg-Str. 9, D-42799 Leichlingen,
: +49(0)2175-8978-0,
: +49(0)2175-8978-50
Page 50
7.8
Test Menu System
The following sub-sections provide information for performing diagnostic checks on the APDA-371 sub-systems using
the TEST menus. Most of these tests will be used for troubleshooting purposes only and are not necessary on properly
functioning units. The TEST menu system is accessed by the TEST soft-key from the main menu and is shown below.
These screens are used to perform calibrations and audits of various sensors, as well as some advanced diagnostics to
resolve failures and errors.
TEST MODE
COUNT PUMP TAPE DAC
CALIBRATE INTERFACE FLOW ALIGN
HEATER FILTER-T RH
SELECT EXIT
The TEST Menu
7.9
COUNT test Screen
The TEST > COUNT screen allows the user to check the function of the beta detector and beta source separate from
the rest of the mechanical or flow operations. Each count test will take 4 minutes, and will show the number of beta
particles counted as they accumulate. The final count value will stay on the display after the counting is finished, and up
to six count tests can be displayed on the screen at once. Count tests are usually performed with a clean section of filter
tape between the source and detector, as in normal operation. The test also allows the membrane to be extended
between the source and detector as well, if desired.
TIME:
This shows the time that the count test is started.
COUNT:
This is the total number of beta particles counted during the four-minute test. You will see this count
rapidly accruing during the test. Typical four-minute count values are between 600,000 and
1,000,000 counts through clean filter tape. The count total will be lower if the membrane is extended,
which simulated adding particulate to the tape. If the count total is less than 500,000 then the beta
detector is possibly wearing out.
M:
Indicates if the membrane is extended (Y), or not extended (N).
MEMBRN:
Press this soft-key to extend the membrane between the source and detector.
NO MEMBRN:
This soft-key withdraws the membrane.
GO:
This soft-key starts the four minute count test. The counting will immediately begin. After four
minutes the counting will stop and wait for the operator to initiate another cycle or EXIT.
7.10
PUMP Test Menu
The TEST > PUMP screen is very useful to test the pump and nozzle, and to perform leak checks and nozzle cleaning.
See section 5.3 for the leak check procedure. Note: The APDA nozzle motor drives the nozzle UP, but the nozzle is
lowered by only its spring tension. It is possible for the nozzle to become stuck in the UP position even if the motor is
working and no errors are generated. It is also possible for the nozzle to not fully seat against the filter tape as well.
These faults are usually caused by an inlet tube alignment problem, a disintegrated nozzle o-ring, or grime in the nozzle
bearings. A good indication of this problem is an irregularly shaped dust spot on the tape, often with a “halo” around it.