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 48
Problem:
The display shows “MISSING TEMP PROBE” message.
Cause/Solution:
•
The unit requires a BX-596 or BX-592 ambient temperature sensor if either the
CONC TYPE or FLOW TYPE are set to ACTUAL. If no sensor is attached to
channel 6 of the APDA, this message will appear.
•
If the Auto ID line from the temperature sensor is not working, the APDA will not ID
the sensor, causing the alarm.
7.6
Nozzle Component Replacement
The nozzle components need periodic inspection, cleaning, and replacement. The nozzle o-ring will need to be
replaced every couple of years to prevent the nozzle from starting to stick. The nozzle itself may need to be replaced if
it becomes worn or damaged, and should be removed and thoroughly cleaned annually or bi-annually. Complete
instructions are available from HORIBA. A set of shim tools are required for nozzle re-assembly.
7.7
Field BKGD Zero Background Tests
The Background value is a correction offset for the concentration data collected by the APDA-371 (see section 6.3 for a
description of the BKGD value). This value is factory calibrated for each unit under laboratory conditions, and is typically
never changed for PM
10
monitoring.
APDA-371 units set up to monitor PM
2.5
must to have this value field verified (and adjusted if necessary) upon
deployment, and at least once per year afterwards using the BX-302 Zero Filter Calibration Kit. The test corrects the
BKGD value to compensate for minor variations caused by local conditions such as grounding and shelter
characteristics. This results in optimum accuracy at lower concentrations typical of PM
2.5
levels. The test also provides
information about the zero noise levels of the unit being tested.
The test involves running the APDA in its normal operating environment with a zero filter on the inlet for at least 72
hours. The new BKGD will then be calculated and entered into the APDA. The test should not be performed during a
period of rapidly changing weather. A complete set of instructions for the test are included with the BX-302 kit.
Inlet Receiver
Nozzle Spring
Nozzle O-ring
Nozzle