AD-1252 Thermal Dispersion Probe Airflow Measuring System Installation Instructions
6
Location Considerations
Mount the DMPR-RA002 Electronic Controller inside of
an air handling unit or place the electronic controller
with similar control panels within the structure.
Do not install or store the electronic controller outdoors.
Mount the DMPR-RA002 Electronic Controller as close
to the probes as possible. See Table 4 for cable length
recommendations.
Mount the DMPR-RA002 Electronic Controller on a flat
surface.
Minimum Mounting Distances
Figure 6 represents applications for which the
AD-1252 Thermal Dispersion Probe with Electronic
Controller is most suitable. If your particular application
is not shown, or if you do not have the space to
observe the minimum distance, please contact your
local Johnson Controls® representative for the best
solution. The locations shown on these details
represent the minimum clearance from most
obstructions that create an airflow disturbance.
IMPORTANT:
The thermal dispersion probes may
be installed in the vertical or horizontal plane of the
duct. Use vertical installation for fan discharge
applications. In vertical mount applications where
moisture is possible, mount the multiplexer on the
top. In horizontal mount applications, mount the
probes so that the plastic sensor shrouds are on the
bottom of the probe to minimize moisture
accumulation. Accumulated moisture can affect the
accuracy of the thermal dispersion probes. The
minimum spacing between probes and filter banks is
6 inches (152 mm) in the direction of airflow. Probes
must be upstream of filters. It is important that the
probes or filters be sized so the seams of the filters
do not sit directly in front of the sensors.
IMPORTANT:
The DMPR-RA002 Electronic
Controller enclosure cover is secured with six
Phillips screws. Take care when mounting the
electronic controller to ensure there is adequate
clearance to remove the cover and make electrical
connections in the top of the box.
D/2
D/2
1D
1D
1.5D
1D
2D
3D
D/2
D/2
4D
D=
2 (H x W)
H + W
Example: 35 in. length x 20 in. width rectangular duct
D = 2 x (35 x 20) / (35 +20)
D = 1, 400 / 55
D = 25.46
FIG
:m
in_i
ns
t_
re
q
Figure 6: Minimum Mounting Distances
