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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 52
canned air or clean water rinse. Alcohol is not used because it leaves a film. CD cleaner works well for badly soiled
membranes. Caution: The membrane foil is a thin sheet of polyester and is extremely fragile! It must be replaced
if damaged. Contact the Service department for replacement instructions.
The CALIBRATE Test Screen
REF MBRN:
This indicates if the reference membrane is extended (>) or withdrawn (<) from the beta particle
path.
COUNT (I
0
):
The total 4-minute beta count through the filter tape only, no membrane.
COUNT (I):
The total 4-minute beta count through both the filter and the membrane.
CAL MASS M:
This is the calculated calibration mass (m) derived from the two count values, the mass which the
unit has just measured for the membrane. An average of several of these values should match the
ABS value within 5%.
START:
This soft-key starts the test cycle. Counting will immediately begin. After 4-minutes the I
0
count will
stop, the membrane will extend, and the I count will begin. At the completion of the test the counting
will stop and the mass of the membrane will be calculated. The total elapsed time is about 8.1
minutes per test.
7.14
INTERFACE Test Menu
The TEST > INTERFACE screen is used to test the relay inputs and outputs on the back of the APDA-371. The two
inputs (TELEM FAULT and EXT RESET) are tested by applying the appropriate signal to the terminals on the APDA,
then verifying that the value on the screen changes in response. The five relay outputs (TAPE BREAK, FLOW ERROR,
DATA ERROR, MAINTENANCE and RANGE) are tested by turning them ON or OFF using the arrow keys, then
verifying that the outputs on the terminals respond accordingly. Note: RANGE not used.
7.15
FLOW Test Menu
The TEST > FLOW screen is where the very important flow calibrations are performed on most APDA-371 units. See
section 5.6. This screen is also useful to check the ambient temperature and barometric pressure sensors, and for
pump and flow controller tests.
7.16
ALIGN Test Menu – Photo Sensor Tests
The TEST > ALIGN menu system is used primarily to factory-test the photo sensors which monitor all of the mechanical
movement in the APDA-371. This is useful if the unit has failed some of the Self-Test parameters. The function of the
six ALIGN sub-menus are described in this section. Note: Remove the filter tape for these tests, or it will break.
CALIBRATION MODE
REF MBRN: <
COUNT (Io):
634000
COUNT (I):
556234
CAL MASS M:
0.801 mg/cm2
START
STOP
EXIT