Abstract:
Methods of calibrating a pH sensor fixed within an enclosed vessel are disclosed. The methods include introducing a buffer into the enclosed vessel, introducing a gas mixture comprising CO2 into the enclosed vessel, measuring a pH signal of the solution, measuring a CO2 concentration of a headspace gas of the solution, and calculating a pH value with a buffer calibration curve. The methods include calculating a calibration parameter with a sensor calibration curve and calibrating the pH sensor with the calibration parameter. Reactor systems are also disclosed. The systems include an enclosed reactor, a pH sensor, a CO2 sensor, a temperature control subsystem, and a controller. Methods of facilitating pH sensor calibration without sampling in a bioreactor system are also disclosed. The methods include providing a controller and providing instructions to operably connect the controller to the pH sensor and the CO2 sensor.
Abstract:
Methods of calibrating a pH sensor fixed within an enclosed vessel are disclosed. The methods include introducing a buffer into the enclosed vessel, introducing a gas mixture comprising CO2 into the enclosed vessel, measuring a pH signal of the solution, measuring a CO2 concentration of a headspace gas of the solution, and calculating a pH value with a buffer calibration curve. The methods include calculating a calibration parameter with a sensor calibration curve and calibrating the pH sensor with the calibration parameter. Reactor systems are also disclosed. The systems include an enclosed reactor, a pH sensor, a CO2 sensor, a temperature control subsystem, and a controller. Methods of facilitating pH sensor calibration without sampling in a bioreactor system are also disclosed. The methods include providing a controller and providing instructions to operably connect the controller to the pH sensor and the CO2 sensor.
Abstract:
A food wash reference fluid delivery apparatus includes a portable reference fluid reservoir comprising an inlet and an outlet and configured to store a reference fluid that includes a predetermined concentration of an analyte, a pump fluidly coupled to the outlet of the portable reference fluid reservoir and configured to pump the reference fluid from the outlet of the portable reference fluid reservoir, a sensor connector configured to fluidly couple with a sensor positioned along a fluid flow path of the food wash system, a sensor fluid line configured to provide the reference fluid from the pump to the sensor connector, an inlet fluid line configured to provide the reference fluid from the pump to the inlet of the portable reference fluid reservoir, and a valve configured to adjustably control a fluid flow rate of the reference fluid through the sensor fluid line and the inlet fluid line.
Abstract:
A self-vibrating pH probe comprise a housing containing an electronic assembly to which is coupled a vibration source element so that at least a portion of vibrations caused by the vibration source element propagate to the electronic assembly, the vibration source element being controllable for at least on/off operation. The self-vibrating pH probe further comprising a pH probe member having a probe tip at a first end, the probe member extending from the housing and mechanically and electrically coupled by a second end to the electronic assembly so that at least a portion of vibrations propagating to the electronic assembly further propagate to the probe tip; and further including a processor coupled to the electronic assembly for coordinating operation of the vibration source element and operation of the pH probe member.
Abstract:
A tool for use in a borehole in a geological formation may include a chassis, a drill collar surrounding the chassis, a port plug coupled between the drill collar and the chassis, RF antennas carried by the drill collar, and a multi-chip module (MCM) electronics package(s). The electronics package(s) may include a hermetically sealed electronics housing positioned between the chassis and the drill collar, a substrate within the electronics housing, RF transmitter circuitry on the substrate to cooperate with at least one first RF antenna to transmit RF signals into the geological formation, and RF receiver circuitry on the substrate to cooperate with at least one second RF antenna to receive RF signals from the geological formation. Furthermore, an electronics housing mount may couple the electronics housing with the port plug, and the electronics housing mount may have a passageway extending therethrough for receiving the port plug.
Abstract:
An ion sensor apparatus comprises at least one ion sensitive field effect transistor (ISFET) device configured to be exposed to a liquid, a reference electrode configured to contact the liquid to which the ISFET device is exposed, and at least one magnet configured to intermittently expose the ISFET device to a magnetic field. A processor is operatively connected to the ISFET device and the reference electrode. The processor modulates the magnetic field to produce a corresponding modulated output in resistance of the ISFET device, and modulation of a reported output value of the ion sensor apparatus.
Abstract:
The invention concerns a device for measuring the pH of an effluent, said device comprising means for measuring an item of information representative of the pH of said effluent intended to be brought into contact with said effluent.According to the invention, such a device further comprises means for modifying the pH value of said effluent close to said means for measuring.
Abstract:
Provided is a device adapted for detecting chemical and physical phenomena and suitable for high integration, and a method for controlling the detection device. When a plurality of pH-detecting devices are used, a variation in sensitivity occurs in each of the sensing units. The variation in sensitivity can be calibrated using a simple method. The amount of charge (output signal) delivered by each of the sensing units to a standard solution is determined, and the difference between the delivered charge amount and a standard charge amount (standard output signal) delivered by a standard sensing unit is determined. The capacity of the potential well of the sensing unit is changed, or the potential of a TG unit when a charge is delivered is changed, so as to cancel out the difference.
Abstract:
A method, computer program product, and system are provided to calibrate a sensor array with a plurality of sensors. The method can include sweeping a voltage of a reference electrode from a first voltage to a second voltage, where the reference electrode is in fluid communication with the sensor array. The output voltage of each of the plurality of sensors can be monitored at one or more voltages within the first and second voltages. An overall average gain of the plurality of sensors can be calculated at each of the one or more voltages. Further, an acquisition window for the sensor may can be determined. The acquisition window can include a maximum distribution of sensors that provides a maximal overall average gain at a particular reference electrode voltage.
Abstract:
The invention relates to a reaction vessel with a sensor unit. The reaction vessel comprising a reaction space configured to be connected with the sensor unit that comprises at least one sensor device configured to be calibrated, at least one compartment containing a calibrating agent, and a housing. The sensor unit is arranged to calibrate the at least one sensor device by contact with the calibrating agent before chemical or physical parameters of a measurement substance are measured, wherein the at least one sensor device is further configured such that the relative movement between the at least one sensor device and the at least one compartment is irreversible. The at least one sensor device is movable relative to the at least one compartment from an initial position into a measurement readiness position. The reaction vessel and the sensor unit can be sterilised or are sterilised jointly.