7
Operation—An acoustic pulse is transmitted from the SmartSonics sensor face. The pulse travels to the surface being
monitored and is reflected off this surface back to the sensor face. The time of flight is divided by 2 and converted to an
output signal directly proportional to the material level.
Calibration Pushbutton/ LED
Indicator for 4—20 mA (750
ohm max.) Output
Deadzone FULL
20 or 4 mA
Yellow
Red
EMPTY
4 or 20 mA
6° to 12°
Span Material Level
Full—Calibration 20 mA or 4 mA (set near target)
1. Calibration mode LED color
2. Push button
Hold for 3 seconds (20 mA) until LED turns
or hold for 7 seconds (4 mA) until LED turns
3. Release button, observe, LED flashes to
acknowledge
Empty—Calibration 4 mA or 20 mA (set far target)
1. Calibration mode LED color
2. Push Button
Hold for 7 seconds (4 mA) until LED turns
or hold for 3 seconds (20 mA) until LED turns
3. Release button, observe, LED flashes to
Calibration—4-20 or 20-4 mA Output
SmartSonic 7
Green
Yellow
Red
Green
Red
Yellow
2 Wire DC 4/20 mA Loop Powered
