Regular calibration is essential for correct reproducibility of pH measurements. The sensitive parts of an electrode are the bulb and the reference junction. These two parts located at the bottom of the probe should preferably always be hydrated. They will allow contact with the solution the measurement of pH.

Our electrodes are supplied with a cap that protects the bulb and the junction of the probe. Before use, this cap should be removed.

KCl salts (Potassium chloride) may be deposited at the tip of the electrode during transport or storage. Just rinse the electrode with tap water to make them disappear.

It is best to keep the glass electrodes in a moist environment. If a probe is dry, it must be rehydrated by soaking it for two hours in the storage solution (PA-70300) or in buffer solutions 7 or 4.

Before use, the pH meter must be calibrated in order to obtain maximum accuracy.

CALIBRATION IN ONE STEP

• Dip your tester/probe in 1″ (2.5 cm) of pH 7.01 calibration solution.
• Wait 20-30 seconds for playback stabilization.
• Adjust the calibration knob or screw to read 7.0 in the display.
• Check the tester by dipping it in the 4.01 calibration solution and wait for the reading to stabilize at 4.0.
• Your tester/probe is calibrated and ready to be used!

IMPORTANT: Perform a calibration each 5-7 days and/or after cleaning.

CALIBRATION IN TWO STEPS

• Dip your tester/probe in 1″ (2.5 cm) of pH 7.01 calibration solution.
• Wait 20-30 seconds for playback stabilization.
• Adjust the calibration knob or screw to read 7.0 in the display.
• Remove the tester/probe in 1″ (2.5 cm) of pH 4.01 calibration solution.
• Wait 20-30 seconds for playback stabilization.
• Adjust the button or calibration screw to read 4.0 on the display.
• Your tester/probe is calibrated and ready to be used!

Perform a calibration each 5-7 days and/or after cleaning.
For testers and indicators with automatic calibration, please refer to the instruction manual.

CLEANING

• Dip your tester/probe in 1″ (2.5 cm) of HI-7061 cleaning solution for one hour.
• Dip your tester/probe once again in the HI-70300 storage solution in order to rehydrate the item.
• Rinse in clear water and proceed to a calibration.
• If you do not plan to use your tester/indicator in the coming days, store it in the Hi-70300 storage solution (see below).

A periodic maintenance eliminates incorrect readings and extends the lifetime of your tester/indicator.

STORAGE

• If you do not plan to use your tester/indicator in the coming days, simply fill the sensor cap with the HI-70300 storage solution.
• In the case of long-term storage (months), fill a container with 2″ (5 cm) of HI-70300 solution and allow the tester/probe to soak. Regularly check the level of the liquid that will evaporate over time.

Storage allows for pH sensor to be kept in good condition and to give ultra fast and accurate readings. A sensor store in dry conditions for 2-3 months will show reading fluctuation or slow response and will need a replacement.