APG IRU-9400 user manual - Manual (Page 21)

Rev. B1, 3/10 IRU Series
21
Automation Products Group, Inc.
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Sensitivity/Trip Point Control
(IRU-2002 and 2003 only)
: Used to select
between potentiometer and software control of the sensitivity setting and *relay
trip point distance (*IRU-2002 only).
Options: 0 = Potentiometer Control, 1 = Software Control
Pulses: Controls the number of sound wave pulses being sent in each
ultrasonic burst. The greater the number of pulses, the stronger the transmitted
signal. The pulses should be set to between 15 and 20 for most open air
applications. In small enclosed areas, such as in a stilling pipe, the number of
pulses may need to be reduced in order to eliminate multiple echoes caused by
too much sound energy being introduced into a confined space. Shorter range
targets and targets with good reflective characteristics require fewer pulses than
longer range or poorly reflective targets.
If the pulses parameter is set to 0, the sensor will not transmit. This can be a
useful tool for troubleshooting. If the sensor is not transmitting (pulses = 0), the
distance reading should display the value set in the Max Distance parameter (see
page 24). An unstable distance reading that jumps around and does not hold at
maximum distance is a good indication the sensor is being affected by electrical
noise.
Gain Control: Determines the method in which gain is applied to target
signals. The options are as follows:
0 = Manual: Uses a standard set gain scheme for general purpose use.
1 = Autosense: Uses a self-adjusting gain scheme. The sensor will
continually adjust the gain based on the strength of echo from the target.
When AutoSense is activated, the maximum attainable gain will be limited
by the Sensitivity and Pulses parameter settings. AutoSense requires more
time for signal processing and is therefore not recommended for fast
moving targets.
2 = Hard-Target: Uses a slowly ramping gain scheme to provide better
optimization throughout the range on targets with good reflective
characteristics.
3 = Soft-Target: Uses a fast ramping gain scheme for better tracking of
targets with poor reflective characteristics.