Liquid Pressure Calibration
Sensor Calibration - Liquid Pressure
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The "Liquid Pressure Calibration" menu can be entered via the drop down menu in the field "Sensor to Calibrate". Two options are available (Manual and Automatic) for each of the items listed.
The settings and calibration of the liquid pressure sensor are done in this menu. The liquid pressure sensor has a working range from 0-25 bar with a corresponding output of 0-20 mA. The analog current signal is converted into a digital value (ADC) by a 10-bit converter (ADC value between 0 to 1023). Each pressure sensor needs to be calibrated.
This page shows the current "Low Reference" [ADC], "High Reference" [bar] and [ADC] values.
Automatic - Liq. Pressure Sensor Low Reference
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Value [ADC]
enter the menu to calibrate the reference value of the pressure sensor.
Manual - Liq. Pressure Sensor Low Reference Value [ADC]
the ADC value is the output of the pressure sensor at 0.0 bar. The value can be between 0 and 305 (corresponding with 6.0 mA). The value can be entered manually with the numeric keypad, but the preferred method is to calibrate the reference value.
Automatic - Liq. Pressure Sensor High Pressure [bar]
enter the menu to calibrate the maximum pressure (bar) of the pressure sensor.
Manual - Liq. Pressure Sensor High Pressure [bar]
this is the maximum pressure which can be measured by the pressure sensor (corresponding with the maximum ADC value). This value must be calibrated.
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WZ00232,0000043 -19-10OCT06-1/5
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Automatic - Liq. Pressure Sensor Low Reference Value
On this page, the auto calibration of the reference value of the pressure sensor (at 0.0 bar) can be carried out.
1.
Make sure that there is NO pressure (0.0 bar) applied to the liquid pressure sensor. Switch off the PTO and open the main shut-off valve and boom section valves temporarily to release any possible liquid pressure in the system.
2.
The actual sensor value (ADC) can be read in step 2.
3.
Press "Next" button to start the automatic calibration and the new reference value for the pressure sensor will be calculated. The reference ADC value should have a maximum value of 305 units (or 6.0 mA) otherwise a calibration error will be given. Save the value by selecting "CAL" button.
4.
After automatic calibration, the screen will go back automatically to the "Liquid Pressure" calibration page.
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Automatic - Low Reference Step 1
Automatic - Low Reference Step 2
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WZ00232,0000043 -19-10OCT06-2/5
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Manual - Liq. Pressure Sensor Low Reference Value
The ADC value is the output of the pressure sensor at 0.0 bar. The value can be between 0 and 305 (corresponding with 6.0 mA). The value can be entered manually with the numeric keypad, but the preferred method is to calibrate the reference value.
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Manual - Low Reference
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WZ00232,0000043 -19-10OCT06-3/5
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Automatic - Liq. Pressure Sensor High Reference Value
On this page, the auto calibration of the maximum pressure value of the pressure sensor can be performed.
1.
First enter the calibration pressure (bar) in step 2 with keypad (use the decimal point.)
2.
Apply a constant pressure to the liquid pressure sensor. Connect a calibrated pressure gauge to the spray line and start the machine. Adjust the liquid pressure of the sprayer on the calibrated pressure gauge to the selected calibration pressure (e.g. 5.0 bar) in manual mode (with switch 3 of control box) with the master shut-off valve and the section valves in the open position (i.e. spraying).
3.
Press "Next" button to start the automatic calibration, the new maximum pressure of the sensor will be determined. The actual sensor (ADC) value can be monitored. The ADC value must be at least 153 units (or 3.0 mA) higher than the reference ADC value, otherwise a calibration error will be given. Save the value by selecting "CAL" button.
4.
After automatic calibration of the maximum pressure value of the liquid pressure sensor, the screen will go back to the menu "Liquid Pressure" calibration page.
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Automatic - High Reference Step 1
Automatic - High Reference Step 2
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WZ00232,0000043 -19-10OCT06-4/5
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Manual - Liq. Pressure Sensor High Reference Value
This is the maximum pressure which can be measured by the pressure sensor (corresponding with the maximum ADC value). This value must be calibrated.
Calibration Error
This screen is shown when, after an automatic sensor calibration, the calibrated value is not allowed. It is possible that a sensor is not functioning properly.
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Manual - High Ref. Cal.
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WZ00232,0000043 -19-10OCT06-5/5
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