PHG-2091Pro Online PH ORP Analyzer Online pH / ORP analyzer and pH / ORP controllers are one of the most common water quality analysers in use today in water treatment and process plants and yet online pH / ORP analyzer cause continual problems for their operators. What is needed is a stable, reliable, online pH / ORP analyzer for a reasonable cost. That is exactly what you get with the BOQU Instrument. A pH / ORP analyzer consist of a Online pH or ORP probe, transmitter and process adaption, combined to best suit your pH control needs. In-line pH analyzers from BOQU Instrument provide accurate process pH measurements in a wide range of environments, from ultrapure water to hygienic measurement in a bioreactor to dirty chemical production.