VRE - Technology for Weed Control: Chemical Injection Control with Carrier Control
by Aida Zabri
1. Requires that the control system change both the:
1.1. Chemical injection rate
1.2. Water carrier rate
1.3. To respond to speed or application rate change
2. Advantages:
2.1. No leftover mix to worry about, and the operator is not exposed to chemicals in the process of tank mixing
2.2. Changeover from one rate to another occurs as quickly as both chemical and carrier controllers can make the change
2.3. Give great deal of control over spraying operations and offer the capability of applying variable rates of herbicides from a pre-planned map
3. Disadvantages:
3.1. More complex system with higher initial cost
3.2. Facing the problem of pushing varying amounts of liquid through the spray nozzles as rates changes
4. Controller
4.1. One control loop manages the injection pump
4.2. Second controller operates a servo valve to provide a matching flow of water
4.3. A perfect system of this type would deliver a mix of constant concentration just as if it were coming form a premixed tank
5. Available system that fit into this category is:
5.1. the Raven SCS 700 series
5.2. the Mid-Tech TASC 6300 system
5.3. the Micro-Trak TNi1740
