AD-1252 Thermal Dispersion Probe Airflow Measuring System Installation Instructions
19
If an error occurs with one of the sensors, an error
indication displays on the LCD screen. The
temperature appears as a lowercase letter f (degrees
Fahrenheit).
Ensure that the product was installed correctly by using
the following guidelines:
•
Use the shortest possible distance between the
control transmitter and the router or probes. See
Table 4 for the maximum distances between the
control transmitter and the router or the AD-1252
probes.
•
For horizontal mount applications, ensure that the
acrylonitrile butadiene styrene (ABS) sensor
shrouds are on the bottom of the probe.
•
Install duct-mounted products at locations as
detailed in the installation instructions. All
installations, especially in rain hoods and mixing
boxes, must have consistent, representative air
flow across all of the probes.
•
If the airflow measuring device is located within
10 feet (3 m) of the intake louver or hood and the
airflow rate is less than 200 FPM, consider
relocating the airflow measuring device, resizing
the opening, or adding a separate damper for the
minimum outside air intake. Transient wind gusts
can result in airflow indications of 100 FPM or more
on outside air intakes even when the intake
damper is closed.
•
Ensure that power and data cables are a sufficient
distance from high voltage power sources and
motors to prevent interference. Conduit may be
required.
•
Ensure that there are no kinks, cuts, or crimps in
the shielded CAT5e cables.
•
Ensure there is no visible damage to the electronic
controller.
•
Ensure that the thermistors are clean, dry, and free
from debris.
The output of individual sensors is viewable on the
LCD screen. When the unit is powered on and displays
velocity and temperature, press the UP or DOWN
button to scroll through each sensor output.
See Table 6 for information about probe locations and
sensor assignment numbers.
Use Table 7 to troubleshoot problems with the
AD-1252 System.
Table 6: Probe Locations and Sensor Assignment Numbers
Probe Location
Sensor Assignment Numbers
Left Input
1 through 4
Left Center Input
5 through 8
Right Center Input
9 through 12
Right Input
13 through 16
Table 7: AD-1252 System Troubleshooting (Part 1 of 3)
Problem
Possible Cause
Corrective Action
The LCD screen displays the units
without a velocity or temperature
value or shows ID# # #.
The transmitter is in calibration mode.
1. Press ESC and ENTER at the same
time to enter the OPTIONS MENU.
2. Press UP and DOWN at the same
time to enter the FACTORY MENU.
PROBE CALIBRATE appears.
3. Press ENTER to access the
CALIBRATION MODE submenu.
4. Use UP and DOWN to set the
CALIBRATION MODE to OFF.
5. Press ENTER to return to the
FACTORY MENU.
6. Press ESC to return to normal
operation.
