Airnet® II 4-Channel Particle Sensors Operations Manual
5-1
Chapter 5
Maintenance and Performance Checks
There is nothing within the Airnet II 4-Channel particle sensor that is user-serviceable.
You can, however, clean the sensor’s housing and repair or replace cables and cable
connectors.
Cleaning the Sensor’s Housing
The Airnet II 4-Channel particle sensor is housed in a sturdy Polycarbonate housing
and should provide many years of trouble-free performance. Periodically it may be
helpful to wipe the case with a clean, lint-free cloth moistened with deionized water or
a mild cleanser.
Cable Connectors
Occasionally a cable connector may be damaged through an accident. The RS-232 and
UTP Ethernet connections are somewhat fragile. If a connector is damaged, be careful
not to aggravate the problem by forcing a cable into a damaged connector. A Particle
Measuring Systems Service Representative can repair or replace damaged connectors.
Performance Checks
Complete the following procedures to verify that your instrument is operating
properly.
Airflow Rate Check
The sample flow is factory-set using a critical orifice and is not adjustable. If the flow
drops by 15 %, there may be a blockage in the critical orifice or inlet jet.
The following instrument(s) will be needed:
•
A 0.1 CFM ± 5% flow meter for models 201-4, 301-4, 501-4
•
A 1.0 CFM ± 5% flow meter for models 310-4, 510-4
To check the air flow rate:
1.
Disconnect all sample tubing and sample probes.
2.
Connect the unrestricted test flow meter to the sample inlet fitting.
3.
Run a sample and monitor the flow meter readings. The measured flow should
be the following:
