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Simple pH Meter Circuit, A Low Cost Adapter for Your Digital

2015-01-10 13:49  
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This article is Simple pH Meter Circuit, A Low Cost Adapter for Your Digital Voltmeter (TL081). The content is very simple, but very useful. An understanding of the components in the article can help you better understand the article. In this article, for example, you can go to understand and purchase these components:TL081.

What is A pH Meter?

A pH meter is actually a precise voltmeter? that measures the generated voltage of a pH electrodes. The requirement of such meter is high input impedance and has the gain of? voltage-pH conversion. The standard pH probe generate voltage about 59 mV per pH,? so all we need is a pre-amplifier with high impedance input and with gain = 16.7 to give 1 Volt per pH. Here is the schematic diagram of the pH meter circuit:

ph meter circuit circuit schematic diagram


pH Meter Circuit

This pH meter circuit use a high input impedance high gain op-amp TL081. The transformer voltage is center tapped 15V? (15V-0V-15V). Multi-turn variable resistor is recommended for the zero, slope, and reference variable resistors. Current consumption of this pH meter circuit should be very small, so the 7812 and 7912 regulator IC won’t need any heat sink.

pH Meter Calibration

To calibrate our pH meter circuit,? follow these steps:

With low cost digital voltmeter (DVM), we can easily obtain 0.05 pH accuracy if? we follow the calibration method as described above.



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