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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 34
8.
If the reference flow (converted to STD conditions) and APDA flow reading match, then adjust the flow
adjustment knob on the back of the unit until the APDA flow reading equals 17.3 LPM.
Manual Flow Compensation for Seasonal Weather Changes:
These steps can be used to periodically adjust the flow rate on a Metered flow APDA with a manual valve to
compensate for changes in average local atmospheric conditions. Full flow calibrations should still be performed on a
regular basis.
1. Measure the ambient temperature T
a
(Kelvin) at approximately 4:00 PM. This usually represents an average daily
temperature.
2. Stop the APDA pump and record the barometric pressure P
a
(mmHg) from the OPERATE > NORMAL screen.
3. Calculate a volume correction term by the following:
V = (T
a
/ P
a
)*62.4
4. Divide V by 24.47 to determine the ratio of EPA flow to Ambient Flow and record as CALNUM.
5. Turn the pump on in the TEST > PUMP menu and allow the flow to stabilize for 5 minutes. Then divide the displayed
flow by CALNUM.
6. Adjust the flow adjustment knob on the back of the APDA-371 until the APDA flow reading equals 17.3 / CALNUM.
Exit the TEST menu.
6
SETUP MENU DESCRIPTIONS
The APDA-371 uses a comprehensive system of setup menus which contain all of the settings and parameters needed
to perform the measurement and operation of the unit. Some of these settings are set at factory default values which
are correct for most applications, but may be altered by the operator to suit the specific needs of your monitoring
program. This section describes the SETUP menu in detail, and should be reviewed when the instrument is put into
service to ensure desired operation. Once set, most of the values in the SETUP menus will not need to be changed by
the site operator. The SETUP values will not be lost if the unit is unplugged or powered down.
WARNING: Some of the settings in the SETUP menus are unit-specific calibration constants which cannot be
changed without affecting the accuracy and proper operation of the unit.
WARNING: Entering the SETUP menu system will require stopping the sample cycle. Older versions of
firmware will not warn you before stopping the sample!
Press the SETUP soft-key to enter the menu as shown below. The Setup Menu provides a choice of operations. Use
the arrow keys to navigate to the desired field, then press the SELECT soft-key to enter.
SETUP MODE SELECT
SELECT
EXIT
CLOCK
SAMPLE
CALIBRATE EXTRA1
ERRORS
PASSWORD INTERFACE SENSOR
HEATER
The SETUP Menu
A brief description of each sub-menu in shown in the table below. Detailed information is provided in the following sub-
sections.