Penetrometers are used to determine the density and compaction of soil and other materials. This is accomplished by pushing a rod with attached cone (ASAE standard cone) into the ground. The resistance of the cone, as it is pushed in the ground, is measured, and recorded in the memory of the cone penetrometer as cone index values (kg). The depth of the cone below soil surface is also measured (mm) and recorded in memory.


The model CP40-II has an optional GPS that records the global or local coordinates at each insertion site. Ultrasonic depth sensing, coupled with a fully integrated GPS, makes both this unit and the data collected extremely accurate.


With a maximum depth measurement of 750 mm, and intervals of 10, 15, 20 and 25 mm, it is possible to record up to 75 cone-index data points per penetration or insertion. The CP40II can store data from 2000 individual insertion readings. Each insertion is capable of having an 18 character site name, full GPS readings, and useful parameters such as maximum depth, depth interval, as well as time and date of insertion. Additional features include the ability to store the type of GPS being used, either GPS or DGPS (differential GPS) and the size of cone being used. All this enables increased infield operation time minimizing return trips to the office.



The CP40II is equipped with a graphical LCD that is used to display useful information while making insertions, or for easy reviewing of stored data. Simplified onscreen prompts are displayed to guide the user, making use of the CP40II as easy as possible.



The CP40-II constantly monitors the penetration speed, displaying this number onscreen for the user to see. In addition to monitoring insertion speed, the CP40II can alert the users if they exceed the set maximum insertion speed, and can automatically abort an insertion if this speed is exceeded. These features ensure that the collected data is as accurate as possible. If an insertion is aborted (for example by hitting a rock), the user is given the option to save or discard the collected data for that insertion.


The CP40II comes bundled with its own retrieval software for computers running Microsoft Windows operating systems, including Window 98 and Windows XP. This software has the ability to graph up to 9 individual insertions on the same plot, and allows one to display the average of those nine insertions. All information, like GPS data, Time/Date, and Site name are displayed for each insertion and the software allows for saving to a data file for easy viewing later. Included in the software is the ability to export the data to a Comma Separated File (CSV), which will open in almost any spreadsheet program, or to export the data to an Excel XML File for Excel 2002 and above.






Weight (assembled without GPS) (kg): 3.9


Weight (in case) (kg): 9.0


Dimensions (assembled without GPS) (mm): 560x1073x130


Case Dimensions (mm): 460x358x175


Maximum Small Cone Index (kPa, kg): 5600, 75


Maximum Large Cone Index (kPa, kg): 2200, 75


Resolution (kg): 0.03


Maximum Insertion Depth (mm): 750


Interval Spacing (mm): 10, 15, 20, 25


Memory Capacity (number of insertions): 2047


Operating Temperature (C):  -10 to +50


Baud Rate/Download speed (bps): 9600


Screen Resolution (pixels): 160x128


Battery Life (mAh): 3000


Shaft size (diameter, mm): 9.53


Small Cone Size (diameter,mm; area,sqmm): 12.83, 130


Large Cone Size (diameter,mm; area,sqmm): 20.27, 323


Cones conform to ASAE Standard S313.3 Feb 99


Copyright © 2005 Soil Measurement Systems. All rights reserved.