pH/mV/Temp Meter - Clean & Cal function
- Accurate
- Simple to use
A pH meter is essentially a high impedance Volt meter, that can measure the potential difference between the internal and external glass surfaces of the pH sensor. A pH meter has an input impedance of at least 1 million of Megaohms. Environmental or mechanical problems often affect pH measurements. Typically, in these conditions, pH meters give a false pH 7 reading and, since in most applications, pH 7 is the expected value, the user is not aware of the problem. Examples of a false pH 7 reading: The glass bulb of the pH electrode is broken Loss of signal (up to hundreds of Megaohms) of the electrode/meter connection cable, due to environmental humidity Cable or connector short circuit To prevent erroneous readings due to system failures, HANNA instruments® presents HI 83140. Should any of the above listed problems occur, HI 83140 will read pH 4. Since the user is not expecting a similar value, he will be immediately aware of poor system performance. Moreover, the Clean & Cal function helps by avoiding the calibration of a dirty pH electrode, that might introduce a systematical measurement error. Simply immerse the electrode in the HI 50021 Check solution and press the Check button: if the green LED lights up, the electrode can be used, otherwise the red LED turns on.
HI 83140 is supplied complete with HI 1217-6 pH electrode, pH 4 and pH 7 buffer sachets, HI 700661 cleaning solution (2 x 20 mL sachet), HI 50021 Check solution (2 x 20 mL sachet), calibration screwdriver, battery, protective case and instructions.
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