Near Intersection of I-35 & I-90 Southern Mn. | I agree with the idea of a manual pressure gauge being easy to read. Sometimes this is quite easy such as on the front boom of my Hagie. Other times a length of tubing might be used.
As I recall, some company made a pressure gauge where the numbers were purposely written in reverse. This allowed you to mount the gauge in a location where you could read it with a mirror.
Setting the low limit where the system maintains a minimum pressure seems more intuitive but setting a low limit based on flow/minute is not terribly difficult to do by observation or consulting a tip chart.
To use a tip chart, consult the chart for your tips and observe the flow rate/minute for a single tip at the minimum pressure you wish to stay at or above. Multiply that value by the total number of tips that you will be using. Covert to gallons/minute if necessary. This value will be the minimum gallons/minute that are needed to keep the spray pressure at the level that you have chosen. Round this number OFF and enter it as the minimum flow rate/minute. The system will then attempt to apply the target rate in Gallons/acre that you chosen BUT will not allow the flow rate/minute to drop too low. An alarm will sound alerting you of this situation since you will be over applying for a brief period of time until your ground speed increases back to a more normal speed.
Those systems such as a Raven 440/450 or the Ag Leader Liquid Product Control module that use volume for a low limit, factor the low volume limit proportionately when some booms are ON and others are OFF. In other words if the operator has set a low volume limit of 8 gallons/minute when all sections are ON (full width), the system would factor this to 4 gallons/minute if only half were being used. This way the same pressure would be used during those brief periods of overapplication whether all booms or only some booms are actually spraying.
Edited by tedbear 3/9/2026 10:11
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Ag leader liquid control harness question
