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Judd Communications Depth Sensor

 

 

Judd Communications 

2248 E. Lauri Kay Drive 

Salt Lake City, Utah 84124 

Phone (801)424-2889 

Fax (801)424-1528 

E-Mail 

[email protected]

 

http://www.juddcom.com

 

 

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. 

 

 

Содержание Depth Sensor

Страница 1: ...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 te...

Страница 2: ... 2 5 Volt Range 0 5 Volt Range Degrees Kelvin 200 degrees Volt 100 degrees Volt The JC Depth Sensor performs multiple echo processing Multiple echo processing dramatically improves the reliability of measurements For each measurement cycle two initial measurements are made If the difference between the two distances is less than 1 centimeter then the second sample is saved and output If the differ...

Страница 3: ...igh 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...

Страница 4: ...nterval 01 P End Table 2 Subroutines 3 Table 3 Subroutines Assign the depth sensor subroutine a number note that this number and the calling number need to be the same 01 P85 Beginning of Subroutine 01 1 Subroutine Number Turn ON the depth sensor 02 P86 Do 01 41 Set high Port 1 Wait 0 8 seconds for the sensor to output the Air Temp 03 P22 Excitation with Delay 01 1 EX Chan 02 80 Delay w EX units 0...

Страница 5: ...be mounted at least half the distance of the beam diameter or 1 95 meters away from the mast Be careful to avoid obstructed beam paths To determine the minimum distance the sensor must be mounted away from the mast use this formula Crossarm length 194 x Height Depth Sensor Beam Width Examples Perpendicular to Surface The JC Depth Sensor must be mounted perpendicular to the target surface Mounting ...

Страница 6: ...should be mounted 4 6 feet away from any vertical supporting structure A good rule of thumb is 2 feet out for every 10 feet the sensor is mounted above the surface The mounting should be adjusted so that the transducer is held parallel to the snow surface Secure the pipe to the supporting tower by using U bolts or tower clamps Measure the distance from the transducer to the target Write this value...

Страница 7: ...Solar Radiation Shield on the bottom of the sensor is made of white PVC plastic and will yellow after several years of exposure to ultraviolet light 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...

Страница 8: ...Mode Normally when using Free Run Mode the Green Sensor Enable wire would be connected to with the Red wire to 12 Volts so the sensor is enabled continuously The measurements are made using the error check retry algorithm so the output is updated every 1 5 to 3 5 seconds Free Run Mode is used with systems that need continuous operation It is also useful when the sensor is used with a datalogger or...

Страница 9: ...ystems and dataloggers want to know minimum and maximum range values instead of scale multipliers These values do not denote the actual maximum range of the sensors Distance Scale Minimum Maximum Inches 0 492 15 Centimeters 0 1250 Air Temperature Scale Minimum Maximum Degrees Kelvin 0 500 WARRANTY The Judd Communications Depth Sensor is warranted by Judd Communications to be free of defects in mat...

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