Operation Manual HORIBA APDA-371
Particulate Monitor
Date:
April, 2010
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HORIBA Europe GmbH, Julius-Kronenberg-Str. 9, D-42799 Leichlingen, Telefon: +49(0)2175-8978-0, Fax: +49(0)2175-8978-50
Page 31
5.6
Field Calibration of Flow System – Actual (Volumetric) Flow Mode
Actual (volumetric) flow calibration is very fast and easy. This type of calibration can only be performed on APDA units
which have an automatic flow controller and a BX-592 or BX-596 ambient temperature sensor on channel 6. The unit
must also have the Flow Type set to ACTUAL in the SETUP > CALIBRATE menu or the flow calibration screen will not
be visible.
MULTIPOINT FLOW CALIBRATION
TARGET BAM STD
AT: 23.8 23.8 C
BP: 760 760 mmHg
<CAL> FLOW 1: 15.0 15.0 15.0 LPM
FLOW 2: 18.3 18.3 18.3 LPM
FLOW 3: 16.7 16.7 16.7 LPM
CAL NEXT DEFAULT EXIT
Actual Flow Calibration Screen
1.
Enter the TEST > FLOW menu as shown above. The nozzle will lower automatically when this screen is
entered. The “APDA” column is what the APDA-371 measures for each parameter, and the “STD” column is
where you will enter the correct values from your reference standard. The <CAL> symbol will appear next to the
parameter selected for calibration. The ambient temperature (AT) and pressure (BP) must be calibrated first, as
the APDA uses these to calculate the air flow rate in actual mode.
2.
Measure the ambient temperature with your reference standard positioned near the BX-592 or BX-596 ambient
temperature probe. Enter the value from your reference standard into the STD field using the arrow keys. Press
the CAL hot key to correct the APDA reading. The APDA and STD values should now be the same.
3.
Press the NEXT hot key to move the <CAL> indicator to the BP field, and repeat the same steps for barometric
pressure.
4.
After the temperature and pressure readings are correct, remove the PM
10
and PM
2.5
heads from the inlet tube
and install your reference flow meter onto the inlet. Press the NEXT hot key to move the <CAL> indicator to the
first flow point of 15.0 lpm. The pump will turn on automatically. Allow the unit to regulate the flow until the
APDA reading stabilizes at the target flow rate. Enter the flow value from your standard into the STD field using
the arrow keys. Press the CAL hot key to correct the APDA reading. NOTE: The APDA reading will not change
to match the STD until after you have entered all three calibration points.
5.
Press the NEXT hot key to move the <CAL> indicator to the second flow point of 18.3 lpm and repeat the
process.
6.
Press the NEXT hot key to move the <CAL> indicator to the third flow point of 16.7 lpm and repeat the process.
Enter the flow value and press <CAL>.
7.
When all of the calibrations are complete, the APDA-371 flow readings should match the traceable flow
standard reading at 16.7 lpm, +/- 0.1 lpm. Exit the calibration menu.
The DEFAULT hot key can be pressed to reset the user calibration from the selected parameter and replace it with a
factory setting. If any of the FLOW parameters are selected, the DEFAULT key will reset the calibrations of all three
flow points. This feature can be used to start over with a calibration if difficulty is encountered.
Actual flow calibrations in units with older firmware:
APDA-371 units with previous revisions of firmware (prior to Rev 3.0) have a different format in the TEST > FLOW
menu, as shown below. These units are flow calibrated in the same way as described above, except that the flow
calibration is performed at only a single point of 16.7 lpm, not a multi-point calibration as in new units. The correct
values from your traceable reference standard device must be entered into the “REFERENCE” column, then the
“ADJUST/SAVE” button is pressed to correct the APDA reading. The “NEXT” key selects the parameter to be
calibrated. AT and BP must be calibrated first, then the pump is turned on.