Page 2-4
Airnet II Particle Sensor Operations Manual
Chapter 2
Unpacking and Installation
Automated Laser Power Control
Airnet II particle sensor units contain an automated laser power control that
automatically shuts off the laser power after 10 seconds of continuous bad flow. The
laser power is restored after 10 seconds of continuous good flow.
Detector Board Monitor
The Airnet II particle sensor has an automatic monitor to assure the detector board is
operating correctly. In many applications the normal condition is
no
particle counts
being detected
for an extended period of time.
If a detector board fails and indicates no counts, this could be similar to not having any
particle counts being measured. To address this unlikely but possible failure mode a
monitoring algorithm is used to indicate a detector board failure. If a failure occurs it
will be indicated within a certain amount of time depending upon the type of
instrument being used. Those times are:
•
Airnet II 301 – 152 minutes
•
Airnet II 501 – 812 minutes
•
Airnet II 510 and 510s – 152 minutes
•
Airnet II 510XR and 510s XR – 152 minutes
This failure will be indicated identically to a laser failure. Using the serial commands
will allow for specific diagnostics to indicate this was a detector board failure.
