Judd Communications Depth Sensor, Manual, Page: 3 / 9

Judd Communications Depth Sensor, Analog Version
The JC Depth Sensor has a beam width of 22 degrees. The closest object to the sensor will be detected if
it is within its beam width. The diameter of the cone is equal to .38 multiplied by the height of the sensor
above the target.
When installed correctly and operated within its limitations, the JC Depth Sensor can provide accurate
and reliable distance measurements. The following are the most likely causes of erroneous
measurements:
•
The sensor is not perpendicular to the target surface
•
The target is small and reflects little sound
•
The target surface is rough and uneven
•
The target surface is a poor reflector of sound, such as low density snow (< 5%)
•
The transducer is obstructed by ice or debris
•
Strong winds are blowing the echo out from under the sensor
SENSOR WIRING
Color Function Datalogger Connection
Red +12V +12V
Black Ground Ground
Clear Shield Ground
Green Sensor Enable 2.5 to 12 V Control Port
White Output High Single or Differential input High*
Brown Output Low Differential input Low*
*When single ended inputs are used, the Brown lead is not used.
SENSOR PROGRAMMING
The following steps show how to make temperature and depth measurements with the JC Depth Sensor.
1. Turn on the sensor by applying a +5 to +12 Volt control signal to the green lead.
2. Wait for 800 milliseconds for the depth sensor to warm up and output a temperature measurement.
3. Sample the Air Temp. output by making a differential voltage measurement between the white (+) and
the brown lead (-).
4. Wait for 1800 milliseconds for the depth sensor to output a distance measurement.
5. Sample the Distance output by making a differential voltage measurement between the white (+) and
the brown lead (-).
6. Reset and turn off the sensor by removing the control signal from the green lead.
PROGRAMMING EXAMPLE
The following programming example shows how a Campbell Scientific CR10 datalogger is programmed
for use with the Judd Communications depth sensor. It assumes that you have a depth sensor connected as
follows:
Datalogger Connection
Red +12V
Black Ground
Clear Ground
Green Control port 1 (C1)
White Differential input channel 3 high (3H)
Brown Differential input channel 3 low (3L)
Blue Not connected