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 32
ACTUAL FLOW CALIBRATION MODE
F1= RESTORE DEFAULT
BAM REFERENCE
AMBIENT TEMPERATURE: 23.8 C 23.4 C
BAROMETRIC PRESSURE: 741 mmHg 742 mmHg
VOLUMETRIC FLOWRATE: 16.7 lpm 16.9 lpm
ADJUST/SAVE NEXT PUMP ON EXIT
Previous Format of the Actual Flow Calibration Screen
5.7
Field Calibration of Flow System – EPA Standard Flow Mode
Flow calibration on units operated in EPA STANDARD flow mode can be done a couple of different ways. If the unit has
a BX-592 or BX-596 ambient temperature probe installed, the easiest way to calibrate the flow is to temporarily change
the FLOW TYPE from STD to ACTUAL in the SETUP > CALIBRATE menu, then perform an Actual flow calibration as
described above. If this method is used, be sure to set the unit back to STD flow when done.
If the unit does not have the temperature sensor then you will not have access to the TEST > FLOW screen. Use the
following steps to check the flow instead:
1.
Attach your flow standard onto the APDA inlet while the pump cycle is running or turn the pump on in the TEST
> PUMP screen. Allow the APDA flow to stabilize.
2.
If your reference flow meter has a STANDARD flow reading available, that value can be directly compared to
the APDA flow reading. If your flow meter only has a volumetric flow reading, then convert the volumetric flow
rate to standard flow Q
s
with the following formula:
Q
s
= Q
a
* (P
a
/ T
a
) * (298 / 760)
T
a
= Ambient Temperature (Kelvin) (Kelvin = C 273)
P
a
= Ambient Barometric Pressure (mmHg)
Q
a
= Actual Volumetric Flow from Reference Meter
3.
Compare the reference flow (converted to STD conditions) to the APDA flow reading (also in STD conditions).
The two should match within 1% (about 0.17 LPM). If not, a full flow calibration should be performed. Change
the FLOW TYPE to METERED and perform a flow calibration using the C
v
and Q
0
values as described in
section 5.8. The sections about the manual flow valve do not apply. Set the flow type back to STD when
finished.
