H87.0.0X.6C-01
Operating manual G 7500 Series
page 11 of 34
4.3.1 Menu
Depending on the selected channel, you can switch to the channel configuration
menu by pressing the function key F2. Here, channel-specific settings can be made.
5
Start operation
Charge the rechargeable batteries by connecting a power supply or the computer to
the micro USB connector.
Connect all desired probes or electrodes.
Turn on the device by pressing the power button.
Change date, time and language by pressing the device settings key and save the
changes made.
6
Basics of the measurement
At first the basics of all measurements will be depicted. Some channel specific
settings depend on these basics.
6.1 pH measurement
The pH value describes the acidic or alkaline behavior of an aqueous solution.
pH values below 7 are acidic (smaller values indicate higher acidity), and values
above 7 are alkaline; pH 7 = neutral.
The pH measurement is very precise, but also sensitive. The measured signals are
very weak (high-impedance), especially when measured in weak or low-ion media.
Therefore, always take measures to
To determine the pH value of a solution, its temperature needs to be
known. The reason is that most liquids change their pH value with the
temperature.
- avoid interference (electrostatic charges, etc.)
- keep plug contacts clean and dry
- prevent electrodes (except special waterproof versions) from extended
immersion above the shaft
- calibrate the electrode at sufficient intervals (see below). The frequency of
calibration can range from every hour to several weeks, depending on the
electrode and the application.
- use a suitable electrode. See chapter
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