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Your MNU IS ultrasonic sensor is very low maintenance and will need little care as long as it was installed
correctly. However, in general, you should:
•
Avoid applications for which the sensor was not designed, such as extreme temperatures, contact with
incompatible corrosive chemicals and fumes, or other damaging environments.
•
Protect against water or ice buildups on the face of the sensor.
•
Inspect the threads whenever you remove the sensor from duty or change its location.
Chapter 5: Maintenance
•
General Care
measure
measure
This procedure uses targets at known distances to calibrate the sensor’s accuracy. A wall or other large, flat
object is recommended for the long range target.
•
Point the sensor at a target at a known distance near the maximum range of the sensor (See Figure
4.1).
•
Adjust the Multiplier value until the distance reading on the sensor matches the actual measured dis-
tance to the target (Holding Register 40416).
•
Point the sensor at a target near the minimum measurement range, approximately 1 foot, plus any
Blanking distance (See Figure 4.2).
•
Adjust the Offset value until the distance reading on the sensor matches the actual measured distance
to the target (Holding Register 40417).
•
Repeat previous two steps until no further adjustment is required.
• Calibration
Figure 4.1
Figure 4.2
NOTE
: If the MNU IS is to be used in an environment with changing temperatures,
all calibration steps must be done with Temperature Compensation (Holding Register
40420) set to 1 (On).
