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Judd Communications Depth Sensor
SPECIFICATIONS
Power: +12 to 18 VDC, 50 mA
(maximum sample time 2.6 seconds)
Output: 0 to 2.5 or 0 to 5 VDC
Range: .5 to 10 meters (1.6 to 32.8 feet)
Beam width: 22 degrees
Accuracy: ± 1 cm or .4 % distance to target
Resolution: 3 mm ( .12 inches)
Temp. range: -40° to + 70°C ( -40° to 158°F)
Size: 8 x 8 x 13 cm (3 x 3 x 5 inches)
Weight: .6 kg (1.3 lbs.)
Mounting: 1/2 inch threaded pipe
Cable length: 7.6 meters (25 feet)
Max. cable length: 304 meters (1000 feet)
Temperature Sensor Accuracy: ± .5°C, -40 to +85°C
Temperature Sensor Resolution: .5°C
INTRODUCTION
The Judd Communications Depth Sensor is an inexpensive solution for remotely measuring snow depth or
water levels. The sensor measures the distance from the sensor to a target. The sensor works by
measuring the time required for an ultrasonic pulse to travel to and from a target surface. An integrated
temperature probe with solar radiation shield, provides an air temperature measurement for properly
compensating the distance measured. An embedded microcontroller calculates a temperature
compensated distance and performs error checking.
Both distance and air temperature can be output as an analog signal between 0 to 2.5 Volts or 0 to 5 Volts.
The depth sensor is user configurable by means of internal dip switches. Several configurations are
possible and allow the depth sensor to work with as many different type of systems as possible.
Accurate measurement of snow depth poses many difficult problems. The Judd Communications Depth
Sensor has proven very effective in measuring snow depth, which makes it well suited for other various
applications.
Judd Communications
2248 E. Lauri Kay Drive
Salt Lake City, Utah 84124
Phone (801)424-2889
Fax (801)424-1528
E-Mail
dan@juddcom.com
http://www.juddcom.com
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Summary of Contents for Judd Communications Depth Sensor
- Page 1 The depth sensor is user configurable by means of internal dip switches. Several configurations are possible and allow the depth sensor to work with as many different type of systems as possible. Accurate measurement of snow depth poses many difficult problems. The Judd Communications Depth Sensor has proven very effective in measuring snow depth, which makes it well suited for other various applications.
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Page 2: Operation
By measuring the amount of time that it takes the ultrasonic pulse to travel from the transducer to a surface and back again, a distance can be calculated. The Judd Communications Depth Sensor outputs an analog signals that are proportional to the distance and air temperature being measured. Both measurements are output sequentially through a single output. -
Page 3: Sensor Wiring
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. - Page 4 Call Subroutine 1 -------------------------------------------------- Table 2 Programs The depth sensor needs another 1.8 seconds to make If somebody left the depth sensor on, turn it off 01: 0.0000 Sec. Execution Interval to 10 measurements and perform error checking If time is and temperature compensation.
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Page 5: Installation
Judd Communications Depth Sensor, Analog Version INSTALLATION When mounting the sensor pay careful attention to the cone of the ultrasonic beam. The beam width is 22 degrees which means that the diameter of the beam will be 39% of the distance to the target, as shown in Figure 1. - Page 6 If mounting to an existing structure such as a tower, attach the depth sensor to a 6 to 8 feet section of 1/2 inch galvanized threaded water pipe (the same kind available at your local hardware or plumbing store). For more rigidity, use ¾ inch pipe with a reducer.
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Page 7: Maintenance
The shield is easily removed by gently twisting it counter-clockwise to unscrew it. Replacement fittings can be obtained from any plumbing supply store, or ordered from Judd Communications. Check the shield periodically for discoloration and to make sure that nest building insects have not taken up residence. - Page 8 Hold air temp. output 1 sec. longer DIP Switch 1 Normally the depth sensor makes one measurement upon power up and then holds the output until it is powered down. In Free Run Mode, the sensor will make continuous repeated measurements with a pause of one second between.
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Page 9: Warranty
Degrees Kelvin WARRANTY The Judd Communications Depth Sensor is warranted by Judd Communications to be free of defects in material and workmanship under normal use and service for a period of one year from the date of shipment. Judd Communications obligation under this warranty is limited to repairing or replacing defective products.
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