ES-405-9800 Manual Rev A Page 25
The ES-405 data does not match BAM or FRM data at the same site
• A K-Factor (multiplier) must be established for good accuracy and correlation to
collocated instruments. The K-Factor will sometimes be very significant, such as a
multiplier of 3 or 5. See Section 5.5.
• The K-Factor is only valid at the same site and for the same particulate type. If the
local particulate source changes, the K-Factor may no longer be valid.
• The ES-405 TSP inlet is designed for low winds only. High winds may cause a cut-
point in the TSP inlet itself.
• Clean the TSP inlet monthly.
• Check the sample RH data and filter RH sensor operation. High sample RH will
cause ES-405 over-reading. The sensor itself can occasionally fail.
• Check the ES-405 for flow calibration problems.
• Check the alarm log for optical system alarms.
8.2 Suggested Periodic Maintenance Intervals
The following table shows the Met One recommended period for routine maintenance items.
Some of these items will need to be performed more, or less, often depending on the exact
characteristics of your location. The program administrator should review these items and
establish SOPs appropriate for your application.
AQ Flow Audit/Calibration
8.3 AQ Flow Calibration
Connect a flow meter to the inlet nozzle of the ES-405 Particle Profiler and allow the flow to
stabilize. If it is not 1.00 LPM ± 0.02LPM, then it needs to be calibrated. Refer to Section 7.1.1.
8.4 Filter Change
The filter cartridge is located in the front panel of the instrument. It can be removed by unscrewing
the black Delrin filter holder. The expected lifetime of the filter is one year, but in heavy particulate
areas they may need to be replaced more often. The replacement filter p/n is 580358.
8.5 TSP Inlet Cleaning
The TSP inlet must be cleaned periodically. The time interval between cleanings varies depending
on the local particulate levels. The TSP inlet should be disassembled and cleaned at least every
three months during continuous use.
The TSP inlet can be disassembled for cleaning by removing the three screws in the cap. Soap
and water often work best for cleaning the TSP inlet and debris screen. Do not over-tighten the
screws during reassembly or the plastic threads will strip out.
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