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A glass pH electrode with a sensitivity of 59 mV pH and a resistance of 10° Q is used to measure pH in the range 0 to 15. The electrode is to be connected to a recorder of input range 0 to 100 mV and resistance 100 Q using a buffer amplifier of unity gain and output resistance 100 2. Calculate the input impedance of the amplifier, and the sensitivity of the recorder scale necessary to obtain an accurate recording of pH. The resistance of the electrode increases to 2 × 10° Q due to chemical action. Calculate the resulting measurement error in the above system, as a percentage of full scale, for a true pH of 7. (а) (b)

A glass pH electrode with a sensitivity of 59 mV pH and a resistance of 10° Q is used to measure pH in the range 0 to 15. The electrode is to be connected to a recorder of input range 0 to 100 mV and resistance 100 Q using a buffer amplifier of unity gain and output resistance 100 2. Calculate the input impedance of the amplifier, and the sensitivity of the recorder scale necessary to obtain an accurate recording of pH. The resistance of the electrode increases to 2 × 10° Q due to chemical action. Calculate the resulting measurement error in the above system, as a percentage of full scale, for a true pH of 7. (а) (b)

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A glass pH electrode with a sensitivity of 59 mV pH- and a resistance of 10° Q is used to measure pH in the range 0 to 15. The electrode is to be connected to a recorder of input range 0 to 100 mV and resistance 100 2 using a buffer amplifier of unity gain and output resistance 100 2. (a) Calculate the input impedance of the amplifier, and the sensitivity of the recorder scale necessary to obtain an accurate recording of pH. The resistance of the electrode increases to 2 × 10° Q due to chemical action. Calculate (b) the resulting measurement error in the above system, as a percentage of full scale, for a true pH of 7.
Transcribed Image Text:A glass pH electrode with a sensitivity of 59 mV pH- and a resistance of 10° Q is used to measure pH in the range 0 to 15. The electrode is to be connected to a recorder of input range 0 to 100 mV and resistance 100 2 using a buffer amplifier of unity gain and output resistance 100 2. (a) Calculate the input impedance of the amplifier, and the sensitivity of the recorder scale necessary to obtain an accurate recording of pH. The resistance of the electrode increases to 2 × 10° Q due to chemical action. Calculate (b) the resulting measurement error in the above system, as a percentage of full scale, for a true pH of 7.
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