Zimmer and Peacock introduce a pH sensor, based on a format that makes the sensors suitable as single use or for continuous monitoring applications.
pH sensors for applications where the sensor is disposable or where continuous measurement is required. Note these sensors have reference electrodes that are chloride resilient.
In the Figure below you are looking at the raw data gathered on a ZP pH sensor, the scientist was testing eight pH electrodes in parallel. The sensors were initially in a solution of pH 7.39, the pH was then changed to pH 9.95, next the pH was changed to 3.75 before finally changed back to 7.39.
In the chart below we have taken the raw data from the experiment and plotted the signal (milliVolts, mV) versus the pH. From that we have calculated our sensitivity of 51 mV/pH/.
In the figure below we have the data for the continuous operation of a ZP pH sensor for 27 minutes. The scientist changed the pH over the 27 minutes by the addition of acid and base so one can see the sensor responding (y axis mV). The data suggests the pH sensor can be used either a s a discreet measurement sensor, i.e measure a drop of blood and then disposed of, or as a continuous sensor in a flowing liquid etc.
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We are also providing the pH sensors in two additional micro-capillary formats, where the pH sensor is housed within a microfluidic cavity, the cavity is designed so that solution is drawn automatically into the sensing area, see adjacent video.
Below we are offering the pH sensors in this capillary format with and without a filter paper. The filter paper which is situated within the capillary is designed to filter particles and materials from the sample matrix.
pH sensors for applications where the sensor is disposable or where continuous measurement is required. This sensor has capillary fill, but no filter.
pH sensors for applications where the sensor is disposable or where continuous measurement is required. This sensor has capillary fill, but no filter in place.