pH Meter

The Youden pH Meter

Sørensen used a slide-wire potentiometer to make his pH measurements. Here a known potential is applied to counterbalance the potential of the hydrogen cell (i.e. the hydrogen electrode plus the counter electrode) and to reduce its current output to zero, at which point the value of the applied counter-potential is equal to that of the cell potential. Since the point of balance is indicated by...

pH Measurement with a fiber-optic tissue-pH monitor and a standard blood-pH meter.

Continuous monitoring of the pH of tissue with a glass electrode was initially introduced by Stamm et al. (1). Its potential value in monitoring the high-risk fetus during labor has been demonstrated in several studies (2-4). However, this technique has not been clinically accepted for routine use in labor, mostly because of problems with the application and sustained proper attachment of the r...

Design and Development of Microcontroller Based Digital pH Meter

A Microcontroller based digital pH meter was designed and developed to measure the value of pH (acidity or alkalinity) for any type of solution. Two op-amps of high input impedance and low output impedance were used to design the pH meter: one is used as a buffer and the other as a summing amplifier. The output of the summing amplifier is connected to the microcontroller as an input. The pH val...

Comparison of tissue pH monitor with a standard blood pH meter.

[Outpatient monitoring of oesophageal pH with a catheter-free pH-meter (Bravo System). A Study of tolerance, safety and efficacy].

BACKGROUND AND OBJECTIVE A new catheter-free outpatient oesophageal pH-meter system (Bravo) has recently been developed. The objective of this study is to test the tolerance, safety and efficacy of the system in the measurement of gastric-oesophageal reflux by comparing it with a conventional pH system. PATIENTS AND METHOD The study was performed on a control group consisting of 10 healthy vo...