APG IRU-9400 user manual - Manual (Page 7)

Rev. B1, 3/10 IRU Series
7
Automation Products Group, Inc.
APG...Providing tailored solutions for measurement applications
Tel: 1/888/525-7300 • Fax: 1/435/753-7490 • www.apgsensors.com • [email protected]
NOTE: Stilling pipes are an excellent solution for liquid level applications
where an unobstructed path to the target is not feasible (see stilling pipe
mounting on page 9 for details).
3. When mounting outdoors, it’s best to shade the sensor from direct sunlight.
Direct sunlight can warm the sensor housing above the ambient temperature
causing false temperature readings and overcompensation by the sensor.
• Sensor Mounting
Proper sensor mounting is critical for successful operation of an ultrasonic
sensor. Using the following guidelines can help ensure trouble free installation
and operation:
1. Ensure that the sensor face is perpendicular to the target surface. If the
target is more than a few degrees off perpendicular, it may not be detected.
Targets at greater distances will require more precise sensor alignment.
2. Mount the sensor in a location that provides an unobstructed column of air
from the sensor to the target. The required width of the air column depends
on several factors, including the angle and reflective characteristics of any
potential targets on the edge of the column, the sensitivity setting of the
sensor, the maximum distance to the target, and the reflective characteristics
of the target itself. Generally speaking a 3 to 4 foot diameter unobstructed
column is sufficient even at longer ranges.
11.4 in. 19 in. 22.8 in. 26.6 in. 30.4 in. 34.2 in. 38 in. 3.8 in. 7.6 in.
9 °
15.2 in.
2 ft.
4 ft.
3 ft.
5 ft.
6 ft.
7 ft.
8 ft.
9 ft.
10 ft.
1 ft.
Sensor
Typical beam spread of an ultrasonic sensor operating at maximum sensitivity setting.