MS-301 Multi parameter Water Quality Sensor
Web:www.boquinstrument.com
6.1.3 pH Sensor Calibration
From the Calibration menu, select the “pH” option to enter the pH calibration procedure, as shown in the
figure below, and then you are ready to start calibration.
Before the test, remove the protective soaking bottle or rubber sleeve with the soaking liquid on the
sensor, immerse the sensor in distilled water, then remove it and gently absorb the water. Be careful not to
break the glass bulb and keep the sensor clean and dry. The pH sensor uses a 2-point calibration method.
The specific calibration steps are:
1. First point (neutral point): Pour the correct amount of pH=6.864 buffer/standard solution into a clean,
dry or pre-rinsed calibration container. Carefully immerse the Sensor at the end of the main unit in the
solution. Make sure the glass bulb is immersed in the solution at least 1 cm. When the pH electrode
voltage data in the software interface is stable, enter the “6.864” buffer/standard solution value in the
“Calibration” box and click “Neutral Calibration”.
2. Second point (acidic point): Rinse the Sensor with water and wipe it clean. Pour the correct amount of
pH=4.001 buffer/standard solution into a clean, dry or pre-rinsed calibration container. Carefully immerse
the Sensor at the end of the main unit in the solution. Make sure the glass bulb is immersed in the solution
at least 1 cm. When the pH electrode voltage data in the software interface is stable, enter “4.001”
buffer/standard solution value in the “Calibration” box and click “Acid Calibration”.