Selecting A Location - Spectris Particle Measuring Systems Airnet II 4-CH Operation Manual

Installation
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 201-4 – 102 minutes
•
Airnet II 301-4 – 152 minutes
•
Airnet II 310-4 – 68 minutes
•
Airnet II 501-4 – 812 minutes
•
Airnet II 510-4 – 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.

Selecting a Location

When choosing the location for the Airnet II 4-Channel particle sensor(s), consider the
following to improve the utility of the unit.
Sample Point – Position the particle sensor to ensure that the sampling probe is
pointed INTO the airflow you want to monitor.
Do NOT use the Airnet II 4-Channel particle sensor with sample tubing
greater than 6 feet (1.8 m) long. Lengths greater than 6 feet can cause the
following negative effect:
• A decreased flow through the sample chamber, resulting in particle counts
that are too low.
Instead of using long tubing lengths, move the particle sensor closer to the
sample point.
•
Accessibility – The unit should be readily accessible for connecting and
disconnecting cables, and so on.
•
Interference with existing equipment – The unit should not interfere with
access to existing or known future equipment installations.
•
Visibility – The unit's front and top panels should be visible from a reasonable
position.
•
Mounting surfaces – The proposed mounting surface should allow mounting
hardware to engage properly and should be of sufficient strength to support the
unit safely.
•
Vacuum – The unit should be located near appropriate sources of vacuum.
•
Cables – The unit should be located near a source of grounded electrical power,
an Ethernet port, and any other devices it must communicate with. Cables
should reach from the unit to the connector without strain.
Airnet® II 4-Channel Particle Sensors Operations Manual
Chapter 2 : Unpacking and Installation
CAUTION
2-3