PH1210
DIGITAL pH-METER AUTO CAL/DATA STORAGE
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PRODUCT PRESENTATION
1.1 FUNCTIONAL PURPOSE OF THE UNIT
The basic system for pH and temperature measuring is made of three parts:
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the meter described in this instruction manual;
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a pH
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a Pt1000 temperature sensor
The instrument has the necessary electric circuits and firmware to perform the following functions:
1)
as the proper sensor is connected, it displays the pH and temperature values;
2)
if a Pt1000 temperature sensor is connected, it will display the temperature values;
3)
it performs an automatic or manual temperature compensation for pH measures;
4)
it performs the manual or automatic pH calibration
5)
it allows the memorization and the visualization up to 100 readings
1.2 FUNCTIONAL PRINCIPLES
When measuring pH, the instrument receives a mV signal from the sensor and it displays the value
in pH units; this is done according to Nernst’s law and the sensor used.
It is possible to make the necessary zero and sensitivity adjustments for pH and the zero adjustment
for temperature.
Temperature influences the solution’s ionic activity and the signal provided by the pH sensor.
For this, in applications where the liquid temperature is different from a reference value of 20 °C, it is
important to use the temperature compensation function of the pH measuring.
In applications where there is a great variation of the temperature value, it is recommended to
consider using a RTD and to use the automatic temperature function.
