Sprayer Calibration Calculator

-Agrotechnology- University of Illinois Extension has released a new smartphone app for making sprayer-related calculations. This app will assist an applicator with calibrating a pesticide sprayer. It can be used for aerial, ground, turf, and boomless applications. It includes functions for determining the required nozzle flow rate, splitting that flow rate among different orifice sizes on an aerial boom, and calculating a required pressure to achieve a specific flow rate. It also has a function to convert values and rates for some commonly encountered variables and to determine maximum and minimum operating speeds based on nozzle capacity. It contains multiple functions related to calibrating a sprayer.

The opening screen allows the user to select from one of four main options: 
  1. Calibration: allows user to calibrate four different sprayers types.
  2. PSI for GPM: allows user to calculate required pressure in order to provide a specific flow rate, or do the opposite. This function allows the user to do one of two things. The first is to calculate the required pressure at which to operate a nozzle in order to achieve a specific flow rate. This can occur when the required flow rate for an application is not specifically listed in a nozzle manufacturer’s flow rate table.
  3. Nozzle Speed: determine minimum and maximum speeds for a specific nozzle. This function can be used to determine the maximum and minimum speeds at which a nozzle should be operated. It should be used when an applicator has a sprayer equipped with a flow control system. Flow control systems automatically maintain an applicator-selected spray application rate.
  4. Convert Value: various pesticide application related unit conversions. The convert value function allows the user to convert various values commonly associated with pesticide applications. The list of values that can be converted is by no means exhaustive and will likely be expanded as the app is updated. The top section of the convert value screen allows the user to select the type of values to be converted. These include flow rates, spray rates, rate conversions for volume per unit area, weight per unit area, and weight per volume.



Spray Calc is available in iTunes and the Google Play store.