VisaGage II Liquid Blockage Monitor Systems

John Blue’s NH3 Flow Monitor Calculator now works on all your devices from your desktop and laptop computers to your mobile phone. The calculator is used to calculate the corrected flow rate to determine the most suitable ball for use in your NH3 VisaGage II Liquid Blockage Monitor System (LBMS). Varying methods of inputs include gallons per minute, pounds of nitrogen per acre, or pounds of NH3 per acre. The calculator is available in both English and Metric units. Instructions for use are available at the bottom of the page.

Choose Unit Preference

Choose Application Method

Enter Application Amount
Enter Ground Speed
Enter Row Information
Row Spacing (?)

I understand that John Blue Company is furnishing this calculator "as is" and that it is not covered by any warranty whatsoever, whether express, implied, or statutory, including, but not limited to, its freedom from errors, its fitness for any particular purpose, and/or its correct or incorrect use. I agree that by using this calculator, I am doing so at my own risk. I agree to hold John Blue harmless for any and all damages directly or indirectly related to the use of this calculator. In no respect shall John Blue Company incur any liability for any damages, including, but not limited to, direct, indirect, special, or consequential damages arising out of, resulting from, or in any way connected to the use of this calculator, whether or not based upon warranty, contract, tort, or otherwise; whether or not injury was sustained by persons or property or otherwise; and whether or not loss was sustained from, or arose out of, the results of this calculator and its use.


I understand that all calculations are based upon the information I provide. Always verify the calculated information before entering the field as variables within your system can cause differences between calculated rates and actual output rates.

Your Estimated Results:

Your Calculated Flow Is

Now you can view or download the Quick Reference Tables to choose the correct settings for your system. The English table is on the 1st page and the Metric table is on the 2nd page.