Instrument: Benchtop pH Meter

Dataset: 
oa_zoo_hatch_chemistry
Instrument: 
Benchtop pH Meter
Instrument Short Name: Benchtop pH Meter
Instrument Description:

An instrument consisting of an electronic voltmeter and pH-responsive electrode that gives a direct conversion of voltage differences to differences of pH at the measurement temperature. (McGraw-Hill Dictionary of Scientific and Technical Terms)

This instrument does not map to the NERC instrument vocabulary term for 'pH Sensor' which measures values in the water column. Benchtop models are typically employed for stationary lab applications.

PI supplied instrument name: Benchtop pH Meter
Dataset-specific description

The pH of the samples were determined using a Ross Ultra semimicroelectrode (Orion #8103BNUWP) connected to an op-amp circuit (unity-gain follower) whose output voltage matches the electrode output. This op-amp output was continuously monitored via a 14 bit A-to-D converter and computer.