3
PRE-INSTALL ATION CONSIDERATIONS
Figure 1
Figure 2
DIMENSIONS ARE SHOWN IN INCHES WITH MILLIMETER EQUIVALENT IN BRACKETS
It is best to mount the
Dust
Alarm
®
ES
on metallic ducting.
Mounting on non-metallic duct may be possible but will have lim-
itations – see Mechanical Installation section. Mounting will be
accomplished utilizing a Tri-Clamp style quick disconnect clamp.
Two mounting kits are available to choose from as accessory
items; 1” Tri-Clamp ferrule kit or ¾” NPT kit. When selecting a
mounting location please give consideration to the following:
1) Accessibility
- The mounting location should be accessible
for maintenance and the controls should be visible to the
installer/operator when the cover is removed.
Probe Length
:
Sensitivity of the
Dust
Alarm
®
ES
is not greatly influenced by probe
length. (Doubling the probe length will only result in sensitivity
increase of a few percent.) However, if the probe length is short in
comparison to the inside diameter of the duct performance can suffer.
It is recommended to establish a probe length that is 1/3 to 2/3 the
diameter (or span) of the duct.
Example
: Exhaust duct with 12 inch
I.D. (305mm), correlates to a probe length of 4 to 8 inches (102 to
204mm).
Choosing a Location:
The
Dust
Alarm
®
ES
must be mounted downstream of the dust col-
lector equipment. The best location is in a section of the ducting
where there is laminar-flow and the dust particles are evenly dis-
persed within the air stream. This ensures the sensor probe is
exposed to a particle stream in an area where the most stable airflow
condition exists. Such an area has no airflow disturbance caused by
elbows, duct size transitions, diverter valves, etc. In the event there
are such flow disturbances near the selected mounting area ensure
the
Dust
Alarm
®
ES
is no closer than three to five times the duct
diameter upstream or downstream of a disturbance. (See Figure 2).
In some applications it may not be physically possible to follow these
guidelines and a compromise must be made. In such applications the
fundamentals of operation must be kept in mind: The sensing probe
must be exposed to particulate which is as evenly dispersed within
the air stream as possible. Ensure the
Dust
Alarm
®
ES
is located
where the sensing probe will be exposed to flowing dust particles -
not “dead” air.
[82.6]
[10.1]
[38.1]
Figure C
Influence of Ambient Temperature
Special Dusts
-
Monitor Technologies’ sensors with inductive electrification tech-
nology perform effectively with the majority of dust materials; An
exception is heavy metal-coated dusts where the behavior is
known to be challenging. For measuring such dusts, contact
Monitor Technologies for application assistance.
Influence of Ambient Temperature
-
As an indication and averaging of different internal and external
tests, Monitor Technologies’ sensors with inductive electrification
technology show very low Influence of Ambient Temperature:
Ef
