Data Harvest Smart Wireless 1110 Руководство - Страница 7
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Coatings on the glass or junction surfaces e.g. proteins, will prevent proper operation (see
maintenance on page 9). Avoid frequent or prolonged periods of use in these solutions.
To set the range
The stored calibration for the sensor is the pH range, which is suitable for most experiments. It is also
possible for the user to adjust the calibration constants of an electrode – this will be stored in the
connected Adaptor as the User pH range, see page 8.
To alter the range in the EasySense2 software:
1)
Either select the Devices icon
and select the edit symbol.
2)
The range setting will be retained until changed by the user.
The sensor ranges
pH range
This range is the pre-set default calibration that is suitable for most investigations. The calibration is
set for operation at a temperature of 25˚C.
±1000 mV
This range gives the reading in mV and can be used in experiments on calibrating a pH sensor using
buffer solutions of known pH values. See page 14.
An ideal would be that the potential is zero mV when the pH is 7 but in a real pH system this is rarely
so, it is normally between -20 mV and +20 mV.
This range can also be used with ion-selective electrodes (ISE) and oxidation reduction probe (ORP).
All ISE's work in the same manner as a pH electrode, in fact the pH electrode is really an H+ ISE. Ions
have either a positive charge or a negative charge. The ISE measures the electrical energy created by
the presence of the charged particles. An Ion Selective membrane controls the flow of the ions to the
electrode; it is this membrane that makes the electrode particular to an ionic species. The production
pH Adaptor & Electrode
or the Setup icon (bottom left of screen), line 1: Sensors
Tap or click the down arrow and select the
wanted range from the list
7
Edit symbol
.
Current range
highlighted