1) Find the target PSI in the app
- Open the Calibration Lookup in the app.
- Tap the filter icon and select Model:
- Single-Pass 1.5 m – center bar spreads to full 1.5 m
- 3-Zone 14 ft – center + wings, single regulator
- Select your GPA (e.g., 100) and Speed (km/h) (e.g., 9–12).
- Note the System PSI shown on that row. That’s the pressure you must hold while spraying.
2) Set tractor & sprayer to match field conditions
-
PTO & Engine RPM: Start PTO. Set tractor RPM to the same engine speed you’ll use on route.
If unsure, use rated 540-PTO or the RPM you need to travel the selected speed in your highest safe gear. - Open the section(s): Turn on the nozzles for the pattern you will run (center only, or center + wings).
- Adjust the regulator/relief: While spraying, turn the pressure knob slowly until the gauge reads the target PSI from the app.
Important: Gauge readings only count under flow.
Pressure with sections off (dead-head/static) is meaningless for calibration. Always set PSI while liquid is spraying.
3) Verify with a quick catch test (recommended)
- With the system spraying at target PSI, catch one center nozzle for 60 seconds.
- Compare to the per-nozzle GPM shown in the app (approximate within ±10%).
- For 3-Zone: check one wing for 60 seconds. If wing flow is high/low, trim with PWM (if equipped) or a restrictor until wing flow ≈ target.
4) Go spray
- Drive at the selected speed. Watch the gauge; small terrain/speed changes may need small PSI nudges.
- If you change speed by a lot, re-select in the app and reset PSI.