Conditioning:

Remove the cap and immerse the pH51 in MA9015 maintenance solution for 2 hours to activate the electrode

CALIBRATION:

Unscrew the battery compartment located on the top of the pH-meter and perform the following two-point calibration procedure:

Acid calibration: for pH measurements below 7 pH:

• Immerse the electrode in the buffer solution pH7.01 (M10007)
• Allow the reading to stabilize and then, using the screwdriver, turn the calibration screw "7" until the reading reads "7.0".
• Rinse the electrode with tap water. Immerse the electrode in the buffer solution pH4.01 (M10004).
• Allow the reading to stabilize and then, using the screwdriver, turn the calibration screw "4" until the reading reads "4.0".

Alkaline calibration: for measurements above pH7:

• Immerse the electrode in the buffer solution pH7.01 (M10007)
• Allow the reading to stabilize and then, using the screwdriver, turn the calibration screw "7" until the reading reads "7.0".
• Rinse the electrode with tap water. Immerse the electrode in the buffer solution pH10.01 (M10010).
• Allow the reading to stabilize and then, using the screwdriver, turn the "10" calibration screw until the readout reads "10.0".

Technical specifications:

• Water resistant
• Range 0.0 - 14.0 pH
• Resolution 0.1pH
• Accuracy ±0.1pH
• Manual calibration 2 points
• MA73600 Electrode (Replaceable Probe)
• Battery 3 x 1.5V
• Duration 1500 hours
• Storage 0 to 50 °C/95% RH max

Changing batteries: The pH51 has the BEPS system (battery error prevention system) that prevents the reader from taking wrong measurements due to dead batteries, turning off the instrument:

• To change the batteries, unscrew the battery compartment and replace the three 1.5 V batteries, paying attention to the polarity of these.
• Make sure the ring is in place before screwing on the compartment.
• Batteries should only be changed in an area not dangerous and with the type of battery specified in this manual.