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UE UCA586 INSTALLATION & OPERATION
POWER REQUIREMENTS
The UE UCA586 requires a 24 Volt, DC power source @ 200 milliamperes total. The power
connections are to be made to the I/O cable. Refer to the Pin Out/Description Diagram for the
connections.
SENSITIVITY CONTROL
In order to accommodate the entire 100 decibel dynamic range, some adjustment in the field is
required. This is set by the 20 turn potentiometer located inside the unit. It is accessed through the
front panel behind the hex head screw next to the DB9 connector. The sensitivity is preset at the
factory to maximum or fully clockwise. If this is too sensitive, turn the potentiometer counterclockwise
to decrease the sensitivity.
THRESHOLD CONTROL
The threshold adjustment is available if an alarm output is required. This is the adjustment used to get
a simple output signal change when the ultrasonic input has either exceeded or gone below a set
point. There is a Alarm Threshold Sense output at pin 8 on the DB9 connector or on the Blue colored
I/O Cable wire. This can be detected as a voltage from 0-10 VDC which is where the threshold or set
point is currently adjusted to. To raise the level, turn the potentiometer clockwise and to lower
the level turn the potentiometer counterclockwise.
VOLTAGE AND CURRENT OUTPUTS
The sensor provides voltage, and current outputs. The voltage and current outputs are continuous
analog signals that are proportional to the ultrasonic activity sensed.
The voltage output has a range of 0 to 10 volts DC full scale. A 2.5 volt change in output voltage
corresponds to a 10dB change in ultrasonic input signal. Therefore, the entire 10 volt range represents
a 40 dB change in ultrasonic input level.
The current output has a range of 4 mA to 20 mA DC. Therefore, the full 4 mA to 20 mA range
represents an ultrasonic level change of 40dB. The output can be connected to a 250 OHM resistor
from current output to current output return and fed to a 5V A to D converter if digital monitoring is
required. Refer to the diagram for connections. Note: Current output is 4-20 mA output (pin 2) and
current output return is pin 3 .
ALARM OUTPUT
The sensor provides an alarm output which is an open collector transistor. The open collector can
switch 24 volts DC @10 mA maximum. The alarm is preset at the Factory to transition at 50% of full
sca
le. There are no “dead bands”. The alarm output stops conducting when the input or ultrasonic
signal level exceeds the threshold level or set point.
HETERODYNED AUDIO OUTPUT
The sensor provides an audio output for use with a speaker or a pair of headphones. The signal can
also be fed into a spectrum analyzer for waveform analysis. The output level is preset at the Factory
@ 90 dBA for the full scale output.
SYSTEM SETUP
Once the system is connected and functioning properly, the sensor should be exposed to the user’s
steady state source of ultrasound (bearing, leak, etc.) this ultrasonic source should represent a
normally functioning valve, bearing, etc. During exposure, the user should monitor the current or
voltage output. The sensitivity should be adjusted so that this steady state ultrasonic level is converted
to an output that is located somewhere in the lower portion of the applicable range (4.3 to 5.0 mA on
the current output or .5 to 1.0 volt on the voltage output).
The unit will now sense the increases in ultrasonic activity above the ambient condition.
