Emerson Net Safety Millennium, Reference Manual

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2.4 Mounting
The sensor must be mounted directly to either a transmitter or to a separate junction box
through a 3/4” NPT conduit entry. Both the transmitter and junction boxes have mounting
holes to allow mounting to a wall or pole as desired. Mounting kit hardware is required
when mounting the transmitter or junction box to a pole. Contact your local Net Safety
representative for detailed information on the pole mounting kits.
The transmitter should be mounted at eye-level and be easily accessible for monitoring
and maintenance purposes. The sensor should be placed where particles are likely to
accumulate and across the direction of the airflow to allow the particulates to pass
through the optical path. To prevent water damage, seal conduit at all points of entry to
the transmitter or junction box.
It is recommended that the APM sensor be mounted such that the air flow will pass
through the optical path of the sensor as shown in
Figure 2-5 .
Note
The APM works off of the principle of infrared energy being reflected off of particulate matter
passing through the optical path of the APM. Therefore, give careful consideration when installing
the APM to ensure that external infrared light does not reach the sensing element.
The APM may be affected by sudden bursts of infrared light; therefore, it is recommended
that a time delay (between two (2) to five (5) seconds) be put into the monitoring system
to prevent nuisance alarms.
Installation
7