Abstract:
An apparatus and method for monitoring microbiological activity in a process stream by measuring dissolved oxygen is disclosed. Bulk microbiological activity and surface associated biological activity are measured using this apparatus and method.
Abstract:
An oxygen sensor includes a metalloporphyrin for detecting oxygen levels. The oxygen sensors may also include a light source and a detector. The sensors are configured to measure changes in spectra in response to the redox reaction. They can detect a variety of samples for presence and changes in oxygen concentration in both solution and gaseous form.
Abstract:
There is provided a dissolved nitrogen concentration monitoring method that enables real-time accurate monitoring of the dissolved nitrogen concentration of a cleaning liquid without complicated operations as well as cost reduction. A dissolved oxygen concentration DO2 during ultrasonic wave irradiation is measured by a dissolved oxygen concentration meter 43. An increase amount of dissolved oxygen concentration ?DO2 is calculated by subtracting an initial dissolved oxygen concentration D0 from the measured dissolved oxygen concentration DO2. Subsequently, an approximation equation corresponding to a specific overflow rate or ultrasonic output power level is read out from a storage section 46, and the approximation equation read out from the storage section 46 is used to calculate a dissolved nitrogen concentration DN2 of mixed ultrapure water from the increase amount of dissolved oxygen concentration ?DO2.
Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus and method for quantifying impurity in input gas stream. SOLUTION: The device and method employ a catalyst to convert the impurity in the input gas stream 12 into detectable species in the output gas stream 30. After that, the concentration of the detectable species is then measured by a detector 26, thereby achieving high sensitivity in analyzing the impurity in the gas stream. COPYRIGHT: (C)2011,JPO&INPIT