Flow Calibration

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Sensor Calibration - Flow

The "Flow Calibration" menu can be entered via the drop down menu in the field "Sensor to Calibrate". There are two options available: Manual and Automatic. The page also shows the current "Flow Sensor Pulses" value [Pulse/l].

Manual To change the "Flow Sensor Pulses" input a new value using the keypad. Press "Enter" to confirm setting. Automatic will start a three step process to calibrate the sensor.

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Automatic - Flow Cal.

In this automatic menu, the flow sensor can be calibrated.

Step 1.
Check the settings of the following and change where required, then select the "Next" button.

Simulated Speed when this menu is selected, the simulated speed is automatically activated. Select the required speed (High or Low) by checking the appropriate box. Target Rate shows the target application rate (as currently set in "Job Settings"). Actual Rate shows the actual application rate. Nozzle Flow Rate shows the actual nozzle flow rate (determined by the controller) based on the current flow pulses is displayed here. Normally, when the actual rate and target rate are same, this value will also be equal to the target nozzle flow rate (for the given application rate and simulated speed).


Step 2.
Follow the on screen instructions 1 to 5. When complete go to the last step by selecting the "Next" button.

Step 3.
Here you will input the calibration result. Press "Enter" to save.

Nozzle Flow Rate enter the measured flow rate during the calibration.


Calibration example
The number of pulses per liter of the flow sensor must be calibrated if a flow sensor is fitted. This is best performed as follows:

1. Program a target value for the number of pulses per liter (e.g. 625) in the menu "Flow Sensor".
2. Program a low simulation speed in the menu e.g. 6.0 km/h.
3. Program a target application rate in the menu e.g. 250 l/ha.

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Automatic - Flow Cal. Step 1

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Automatic - Flow Cal. Step 2

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Automatic - Flow Cal. Step 3

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4. The required nozzle flow rate (L/min) for the target application rate in l/ha (e.g. 250 l/ha) and driving speed (e.g. 6.0 km/h) in this example is then 1.25 l/min.
5. Let the machine spray with all sections opened until the actual rate displayed equals the target rate (e.g. 250 l/ha).
6. Now measure the output of a few nozzles with the aid of a stopwatch and a measuring jug, for one minute (preferably one nozzle behind the machine, one in the centre of the spray boom and one at the end of the spray boom).
7. Stop spraying.
8. Calculate the average nozzle output in l/min (let's assume this is 1.29 l/min).
9. Input this value as new nozzle flow rate with the numeric keypad, be sure to use the decimal point. Press "Enter" to confirm and store the value. After entering this value, the correct flow sensor pulse value is now calculated and stored in the memory of the sprayer control system. The new pulse value will be: (nozzle output according to table / average nozzle output measured) x target pulse value flow sensor. In the example this would be: (1.29/1.25) x 625 = 645 pulses per liter. The screen will return to the main calibration page, where the details can be checked.

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