Abstract: A biosensor calibration method configured to measure a concentration of a specific substance contained in sample liquid to be measured, including: a first step configured to acquire a first output value that is output by the biosensor when first calibration liquid is brought into contact with the biosensor; a second step configured to acquire a second output value that is output by the biosensor when second calibration liquid having a different concentration from that of the first calibration liquid is continuously brought into contact with the biosensor after the first step and determine time for replacement of the biosensor on the basis of the first output value and the second output value.

Abstract: A method for managing a thermodynamic device for a motor vehicle, a system, a program, a recording medium and an associated vehicle. The method manages a thermodynamic device for a motor vehicle including a heat-transfer fluid circuit, and includes an initial verification in which a functional state or a failure state in the heat-transfer fluid circuit is detected by taking a first measurement of pressure of a heat-transfer fluid in the heat-transfer fluid circuit and comparing same with a first threshold and, after the initial verification during which a failure state was detected, performs confirming the failure state during which a new verification is carried out by taking a second pressure measurement and comparing same with a second threshold.

Abstract: A method for taking field measurements of a cone type fluid flow meter including a meter body and a cone-type fluid displacement member to determine when to calibrate or replace the fluid flow meter. The method includes taking measurements of dimensions of the fluid displacement member and the meter body, evaluating the dimension measurements and ascertaining whether the dimension measurements are within designated dimension limits. The present method saves significant time and costs by taking measurements in the field determining whether to calibrate or replace the fluid flow meter.

Abstract: A field device includes one or more processors configured to perform a first processing with reference to safety-critical data and a second processing with reference to safety-uncritical data which is less critical than the safety-critical data, wherein the one or more processors are configured to generate a first request for storing the safety-critical data in the second processing, store the safety-critical data into a storage unit in the first processing in accordance with the first request, and store the safety-uncritical data into the storage unit in the second processing.

Abstract: A length from a lower end position of the detection head (11) to a measurement lower limit of the detection head (11) is divided by height positions separated with a predetermined interval pitch. A plurality of virtual level plates (40) are prepared to be placed respectively at the height positions separated with a predetermined interval pitch such that gaps between themselves and each wide face of the mold (1) are not larger than 2 mm respectively at the height positions. Calibration is carried out while using each of the virtual level plates (40) at a corresponding one of the height positions.

Abstract: A home site fuel monitor device in conjunction with a remote central site system to provide accurate fuel usage data used in planning fuel deliveries. The fuel monitor device is an internet based, compact, and low cost home heating site monitor device that is easily installed in the home heating site without modification to the home site's heating system. The monitor device includes a microprocessor which measures heating system run times using real time clock values. The microprocessor computes heating system fuel usage and the rate of fuel usage using heating system run times and heating burner parameters down loaded from the remote central site system. The monitor device continuously adjusts or recalibrates the rate of fuel usage defined as a burn coefficient value to coincide with the latest delivery information received from the central site system which results in increased accuracy over time.

Abstract: A system and method for determining a rate of flow of an output from a vessel. The system includes a vessel having an inlet for receiving an output produced by an output generation device, and a measuring device for measuring a first pressure and a second pressure in the vessel. The first pressure is measured when the output generation device is in a standby mode and the second pressure is measured when the output generation device is in an operational mode. The system includes a programmable logic controller configured to calculate a rate of flow of the output utilizing the first pressure and the second pressure.

Abstract: Pipetting errors are detected by: (a) during pipetting, measuring the pressure in the tip of a pipetting device and determining an earlier rate of change of the pressure in the tip; (b) based on the earlier rate of pressure change and a previous pressure value pi, determining an expectation range for the pressure pi+1 at a further moment in time and/or an expectation range for the rate of pressure change ?i+1 based on the pressure at the further moment in time ti+1; (c) at the further moment in time ti+1 measuring the pressure pi+1 in the tip; and (d) determining the occurrence of a pipetting error by comparing the measured pressure pi+1 at the further moment ti+1 in time and/or a rate of pressure change ?i+1 calculated on the basis of the pressure pi+1 at the further moment ti+1 in time.

Abstract: An air flow measurement device measures a flow amount of air. A flow sensor is configured to output a voltage value corresponding to a given flow amount of the air. A temperature sensor is configured to output temperature of the air. A correction coefficient memory portion is configured to store a correction coefficient for correcting the voltage value of the flow sensor to a corrected voltage value associated with the given flow amount based on a predetermined standard temperature. A relationship between the voltage value of the flow sensor and the flow amount of the air changes based on temperature of the air. A correction portion is configured to correct the output voltage value of the flow sensor to the corrected voltage value using the correction coefficient.

Abstract: A process and system for self-calibration of a density profiler is disclosed. The process may include measuring a density profile of a fluid in a vessel using a plurality of sensors or a single sensor, and measuring a density profile of the fluid in the vessel using a plurality of sample ports. A density of the fluid proximate a location of at least one of the plurality of sample ports based on the sensor measured density profile may then be interpolated. A density of the fluid proximate a location of at least one of the plurality of sensors based on the sample port measured density profile may also be interpolated. Adjustment of a calibration of at least one of the plurality of sensors may then be made based on both the interpolated sample port density and the interpolated sensor density.

Abstract: A meter that monitors usage of a water distribution system by a client is provided. The meter includes a wireless communications system operable to communicatively couple the meter to a wireless network to provide two-way communication between the meter and the wireless network; a calibration system operable to calibrate the meter, wherein the calibration system may calibrate the meter in response to an instruction received via the wireless network; and a power system operable to maintain a sufficient level of power for the meter to allow substantially real-time communication between the meter and the wireless network.

Abstract: Temperature compensation is applied to correct for temperature mismatch between a reference chamber and a disposable chamber in a pneumatic pumping system for dialysis fluid for peritoneal dialysis. The mismatch creates an error in the calculation of pumping volume of dialysate fluid. Applying a correction for the temperature mismatch helps to more precisely control the volume of dialysate that is metered to the patient. Also disclosed are ways to keep temperatures constant and to use temperature sensors to accurately measure the temperatures of the chambers. In other aspects, the temperature of the dialysate fluid itself may be measured and used to apply a correction to the volume of fluid that is pumped to the patient.

Abstract: A method of calibration transfer for a testing instrument includes: collecting a first sample; generating a standard response of a first instrument based, at least in part, on the first sample; and performing instrument standardization of a second instrument based, at least in part, on the standard response of the first instrument. Data corresponding to a second sample is then obtained using the second instrument and a component of the second sample is identified based, at least in part, on a calibration model.

Abstract: A multi-phase process fluid is passed through a vibratable flowtube. Motion is induced in the vibratable flowtube. A first apparent property of the multi-phase process fluid based on the motion of the vibratable flowtube is determined, and an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property is determined. A corrected intermediate value is determined based on a mapping between the intermediate value and the corrected intermediate value. A phase-specific property of a phase of the multi-phase process fluid is determined based on the corrected intermediate value.

Abstract: A method and apparatus for determining at least one flow parameter of a fluid flowing within a pipe, which fluid contains particles entrained within the fluid flow is provided. The method includes the steps of: 1) determining a velocity of the fluid flow within the pipe; 2) sensing the impingement of particles on a surface wetted with the fluid flow, and producing a signal relating to the impingement; and 3) determining the at least one flow parameter of the fluid flow utilizing the determined fluid flow velocity and the sensor signal relating to impingement of the particles on the surface wetted with the fluid flow.

Abstract: A method for determining at least one characteristic for the correction of measurements of a Coriolis mass flowmeter which is characterized by an increased accuracy and a low error rate while determining the characteristic is implemented by detecting values of a measurand during constant flow with the reading sensors, calculating at least one location parameter from the detected values, an calculating at least one dispersion parameter from the detected values and the location parameter. The detection of additional values and the calculation of the location parameter and dispersion parameter from the existing and additional values is carried out until the dispersion parameter reaches a threshold value, and then, the location parameter corresponding to the dispersion parameter is used as the characteristic for the correction of the reading of the Coriolis mass flowmeter.

Abstract: A method measures a hybrid flow rate (Q) of a fluid using simultaneously at least two measuring technologies and a reference measurement, the method includes a hybrid value, wherein the measurements of the at least two measuring technologies are combined according to a given rule to get the hybrid value by performing a linear or non-linear interpolation within a given interval of the reference measurement.

Abstract: If determination is erroneous in appliance determination according to the instantaneous flow rate output from a flow rate measurement unit, a flow rate measurement apparatus registers it as an unknown appliance, rechecks the flow rate of the unknown appliance, and makes it possible to enhance the accuracy of the appliance determination. The apparatus has a flow rate measurement unit 3, a flow rate information storage unit 8 for storing the flow rate value of the flow rate measurement unit 3, a computation unit 6 for finding a difference value between the flow rate values output from the flow rate measurement unit 3, an appliance registration storage unit 7, an appliance determination unit 9 for determining an appliance, and an unknown appliance registration unit 10 for registering information according to which the appliance cannot be determined.

Abstract: A method of calibrating a dispenser includes dispensing a dose of product from a dispenser reset to an uncorrected state and measuring a single dose of product from a draw representative of an average dose (typically dispensed when the product tank is at mid-fill level). Pre-determined equations relating a calibration offset, a timing constant, desired portion sizes, and a degradation factor to the average expected dispense throughout a tank of product and the expected variation in these doses are employed to derive the degradation factor characteristic of the specific dispenser, calculate calibration and timing factors, and adjust the equipment dispense control function accordingly.

Abstract: Electronic systems, such as printing systems, often use components that have a memory. The integral memory can be used to store information about the component. In some printing systems this memory includes storing a portion that stores a value indicative of an amount of a consumable that has been used. Discloses is a method and system for updating a memory that is integral to a component within a printing system. The value stored in the memory can be read to determine an amount of a consumable used. Alternatively, when a specific value is stored in the memory the printing system can deactivate the component.

Abstract: A method for estimating a location of a leak (x) in a pipe (1). A liquid of a known density is fed into the pipe at a first inlet pressure (P1). When the liquid achieves a substantially steady flow rate, the flow rate passing into the pipeline is recorded. This step is repeated at a second, different, inlet pressure (P2). Using this data, an estimate of the leak location (x) and the area of the leak is calculated by simultaneously solving an expression which is based on relating the frictional energy losses of the liquid travelling through the pipeline (1) to the pressure in the pipeline at the leak (Pleak) and the flow rate of liquid from the leak.

Abstract: A pressure detector detecting a pressure of cold or hot water; a temperature detector detecting a temperature of a pressure sensor; correcting equation storage storing, cold water correcting equation information applied when the temperature detected by the temperature detector is included in a cold water temperature range, and hot water correcting equation information applied when the temperature detected by the temperature detector is included in a hot water temperature range; a temperature range determiner determining the temperature range that includes the temperature detected by the temperature detector as either a cold water temperature range or a hot water temperature range; and a correction calculating portion using the correcting equation corresponding to the temperature range determined by the temperature range determiner correcting the detection signal by the pressure detector, and outputting the post-correction signal as a measurement signal.

Abstract: Water droplets in exhaust gas that is, or was, analyzed by a remote emissions sensing system are detected. The detection may be made using measurements generally captured by the remote emissions sensing system during typical operation. As such, the detection may be applied “on site” as remote emissions sensing analysis is ongoing, or may be applied post hoc from data previously acquired by a remote emissions sensing system. The detection may be implemented without requiring additional sensors, more sophisticated sensors, and/or other additional or more sophisticated equipment being included in the remote emissions sensing system.

Abstract: An apparatus and method are provided in order to verify the calibration on the fluid handling system. A magnet coupled to the scale is used to attach a precalibrated weight so that a controller in the system can determine if the scale needs to be calibrated. This way a storage tank does not need to be removed in order to check the calibration of the scale. The system can be locked down if the calibration is not within the predetermined calibration tolerance.

Abstract: A method for operating an oxygen sensor arrangement senses the oxygen in a breathing loop of a breathing apparatus. The sensor arrangement includes a primary oxygen sensor to measure the oxygen in the breathing loop, a secondary oxygen sensor to measure the oxygen in the breathing loop, and a control arrangement to obtain measures from the oxygen sensor. A test channel arrangement provides a first gas having a first fraction of oxygen from a first gas supply to the primary oxygen sensor at a position adjacent to the primary oxygen sensor. A test valve arrangement opens and closes the flow of the first gas through the test channel arrangement. The control arrangement actuates the first test valve arrangement to provide an amount of the first gas to the primary oxygen sensor via the test channel arrangement and obtain measures from the primary and secondary oxygen sensors.

Abstract: The systems and methods described herein related to measuring hydraulic parameters across a surface water-aquifer interface. In particular, the systems include a pressure differential sensor within a watertight housing. The pressure differential sensor has two inlets, one of which is connected to a piezometer located in an aquifer, and the other of which is connected to a surface water body. A solenoid valve allows the systems to switch between a first, measurement configuration and a second, calibration configuration. A pump and a conductivity-temperature sensor enable a third and fourth configuration for measuring the electrical conductivity and temperature of surface water and groundwater. The collected data is then locally stored or transmitted wirelessly. The low-power components and calibration capabilities of the systems allow for long-term deployment, on the order of six months or more.

Abstract: Techniques for leak detection are described. A leak detection module may include a plurality of wires comprising one or more collection points. The leak detection module may further include a capacitor configured to store a charge for powering the module during a power-off state and a plurality of switches to be controlled by a processor. The processor may initiate a predetermined switching sequence when a power-off state has been detected. During the switching sequence, leak detection data may be collected at the one or more collection points. The collected leak detection data may be stored in a set of registers. The leak detection module may transmit the stored leak detection data. Other embodiments are described and claimed.

Abstract: Methods for calibrating an emission rate measurement of a gas are provided. The methods involve discharging a reference gas that is the same or a different composition than a subject gas. If the same or similar, then a combined emission rate of the reference and subject gas is measured, as well as an emission rate of the subject gas only. A deviation, or an one or more adjusted parameter, of the combined and subject gas measurement from the reference gas discharge rate is used to calibrate the subject gas measurement. If the reference gas is different, the emission rates of the subject and reference gas are measured, and a deviation, or an one or more adjusted parameter, of the measured rate from the discharge rate of the reference gas is used in calibrating the subject gas measurement. The methods may also use a modified 2-D tracer measurement as a reference.

Abstract: A system comprises a differential pressure sensor, a process pressure sensor, a temperature sensor and a microprocessor. The differential pressure sensor is positioned to sense differential pressure along a fluid flow, where fluid properties of the fluid flow have first and second phases separated along a transition curve. The process pressure sensor is positioned to sense a pressure of the fluid flow, and the temperature sensor is positioned to sense a temperature of the fluid flow. The microprocessor is coupled to the temperature sensor and the pressure sensor to determine a flow rate, and the microprocessor generates a diagnostic based on the process pressure and the temperature as compared to the transition curve.

Abstract: In a flow control device 100, a comparator 40 outputs a first control voltage Vref based on a comparison of an instruction value signal Vi1 of the flow volume and a signal Vi2 according to the sensor output signal Vs. A feedback current generator 30 generates a feedback current Ifb according to a difference between the sensor output signal Vs and a signal Vi2 according to the instruction value signal Vi1. A feedback voltage generator 50 is a resister. A feed forward current generator 20 generates a feed forward current Iff according to the instruction value signal Vi1. A synthesis unit 60 generates a second control voltage Vdrv* obtained by adding to the feedback voltage Vfb a voltage according to a sum of the feedback current Ifb and the feed forward current Iff. The valve unit 90 is controlled according to the first and the second control voltage Vref, Vdrv*.

Abstract: A measurement device measures a liquid flow discharged from a funnel in a lower branch and/or a side branch. A modelling function is established between liquid flows received with the funnel and/or liquid flows discharged through the lower branch and/or the side branch. In drainability measurement, a sensor measures the flow through a wire out of a measurement chamber at least at two points in time. A processor establishes a parameter descriptive of the drainability from flows measured at the different points in time based on a modelling function stored in a memory.

Abstract: A system, including a utility meter, smart meter and/or a central office of a utility company may provide output to assist consumers to identify gas use by individual appliances. The system may measure gas flow rates, categorize the rates to assist in association with a gas consuming appliance, and provide output to identify use by one or more appliances. The output may include information on consumption and/or cost associated with one or more appliances, such as a furnace, hot water tank and/or stove. The output may be graphical, tabular or otherwise presented in any desired user interface or invoice, etc.

Abstract: Descriptions are provided for implementing flowmeter zero checking techniques. In operating a flowmeter, it may be the case that, even if previously calibrated, the flowmeter will produce erroneous measurements, will indicate a non-zero flow during a period of zero flow. Therefore, zero checking features are provided that allow for fast and accurate determinations of the zero-flow values, for use in adjusting later measurements. The zero-checking features include a button attached to an exterior of a flowmeter, so that it is easily accessible to an operator of the flowmeter. The button, in conjunction with an internal zero checking system, allows for a display of a zero value in response to a request from the operator of the flowmeter.

Abstract: A computer system is described. The computer system is provided with a processor and a computer readable medium. The computer readable medium stores computer executable instructions that, when executed, cause the processor to receive a first reference density measured at a first pressure and a second reference density measured at a second pressure. The first and second reference densities are measured at a reference temperature. The computer system receives a first tube period measured at the first pressure and a second tube period measured at the second pressure for a Coriolis meter, with the first and second tube periods measured at the reference temperature. The computer system receives at least two test densities and at least two test periods. The test densities and the test periods are measured at at least two test temperatures. The computer system associates an offset and a temperature correction factor with the Coriolis meter.

Abstract: A system to monitor a status from a secondary location of a plurality of equipment on a drilling site, while simultaneously enabling preventive maintenance is described herein. A user can view at least one cycle, at least one control state, and at least one pressure. The user can also view equipment information, equipment repair history, and other information necessary to ensure that a piece of equipment has minimal down time.

Abstract: A method to monitor a status from a secondary location of a plurality of equipment on a drilling site, while simultaneously enabling preventive maintenance is described herein. A user can view at least one cycle, at least one control state, and at least one pressure. The user can also view equipment information, equipment repair history, and other information necessary to ensure that a piece of equipment has minimal down time.

Abstract: A system for monitoring the status of a plurality of tensioner assemblies and rig motion assemblies from a secondary location. The system not only monitors a status of a tensioner from a secondary location but simultaneously enables preventive maintenance to be ascertained remotely.

Abstract: In one aspect, a method for reducing uncertainty in a hydraulic model of a water distribution network due to uncertain parameters and faults in the water distribution network is provided which includes the steps of: (i) calculating an optimized placement of sensors throughout a given uncertain section of the water distribution network; (ii) collecting data from the sensors; (iii) partitioning the given uncertain section of the water distribution network into observable and unobservable sub-sections based on the hydraulic model and a) a position, b) a number, and/or c) a type of the sensors that are available; (iv) correcting uncertain parameters and identifying faults for each of the observable sub-sections; (v) calculating a global uncertainty value for each of the unobservable sub-sections; and (vi) repeating the steps (i)-(vi) iteratively, at each iteration selecting an uncertain sub-section of the water distribution network, until no uncertain sub-sections of the water distribution network remain.

Abstract: Performance of mass flow controller may be vulnerable to pressure transients in a flow path to which the controller is coupled for the purpose of controlling the fluid flow. A system and method are provided for reducing or eliminate performance degradations, instabilities, and/or inaccuracies of a mass flow controller caused by changes in the pressure environment. In particular, a method and system are provided for compensating for pressure transients in the pressure environment of a flow path and mass flow controller.

Abstract: This invention provides a diagnostic mechanism of a differential pressure type mass flow controller comprising a diagnostic parameter calculating section that obtains a mass flow rate integrated value by means of an integrating calculation from the lowering pressure value of an inlet side sensor among the inlet side sensor and an outlet side sensor arranged in communication respectively at the inlet side and the outlet side of a differential pressure generating resistive element that generates a differential pressure between the inlet and the outlet by changing a flow rate control valve arranged on the channel where a fluid flows from a flow rate control state to a closed state, and further obtains a diagnostic volume value from the obtained mass flow rate integrated value, and a comparing section that compares the diagnostic volume value obtained at the diagnostic parameter calculating section with a specified volume value.

Abstract: A measurement apparatus is disclosed in which a barrier separates a chamber into a first region and a second region. The barrier is of a known thickness, and it comprises holes having a known radius. Gas flow means provide a flow of a carbon dioxide in the first region and a flow of a nitrogen in the second region. A gas detector measures the concentration of carbon dioxide in the second region and a processor calculates the theoretical diffusive flux from one region to another based on the known properties of the through-holes. The processor is arranged to calculate a calibration parameter in order to relate the measured parameter to the theoretical diffusive flux, based on the known properties of the through-holes.

Abstract: A mass flow controller includes a thermal mass flow sensor in combination with a pressure sensor to provide a mass flow controller that is relatively insensitive to fluctuations in input pressure. The pressure sensor and thermal sensor respectively provide signals to an electronic controller indicating the measured inlet flow rate and the pressure within the dead volume. The electronic controller employs the measured pressure to compensate the measured inlet flow rate and to thereby produce a compensated measure of the outlet flow rate, which may be used to operate a mass flow controller control valve.

Abstract: A method for detecting blockage of a measuring tube of a Coriolis flow measuring device, which has at least two measuring tubes. For this, the at least two measuring tubes are excited by at least one exciter to execute mechanical oscillations, mechanical oscillations of the measuring tubes are registered by at least one sensor and at least one measurement signal representing the mechanical oscillations is produced. At least one produced measurement signal is analyzed for the occurrence of a deviation of a resonance frequency of one measuring tube relative to a resonance frequency of the at least one other measuring tube. In case such a deviation occurs, blockage of a measuring tube is established.

Abstract: Various embodiments include apparatus and methods to monitor flow of single and multiple phase fluids. Sensors of a tool can be dispersed along the tool to collect measurements to be processed using an autocorrelation operation on the collected measurements to provide information relative to the phases of the fluid. Additional apparatus, systems, and methods are disclosed.

Abstract: Techniques are provided for tuning a rotary positive displacement pump. The techniques include apparatus featuring a signal processor configured to the present invention may take the form of apparatus comprising a signal processor that may be configured to receive signaling containing information about actual pump performance data related to the operation of a rotary positive displacement pump; and determine corrected published pump performance data to operate the rotary positive displacement pump by compensating published pump performance data based at least partly on the actual pump performance data. The corrected published pump performance data may include a corrected published rated power, flow and slip factor, and the actual pump performance data contains information about actual power, specific gravity and viscosity related to the operation of the rotary positive displacement pump and received from a pump controller or controlling device, including a variable frequency drive.

Abstract: A method for performing an assay on a liquid sample for the detection of one or more analytes of interest in an assay device having a flow path which includes a sample zone and detection zone thereon includes: dispensing the sample onto the sample zone; combining the sample and a reagent, wherein the sample and reagent may be combined prior to addition of the sample to the sample zone or on the assay device, flowing the combined sample/reagent by capillary action into and through the detection zone having capture elements bound thereto, wherein a signal at least partially representative of the presence or concentration of analyte(s) is produced and detected; determining a reaction time or reaction volume; and determining the concentration of the analyte by using both the detected signal and the reaction time or reaction volume.

Abstract: In a device and method for measuring a mass flow rate of a fluid, a housing has two hollow pipes communicating with one another and having a fluid inlet and a fluid outlet, an electromagnetic excitation unit excites vibrations in the hollow pipes, two electromagnetic adapters are associated correspondingly with the two pipes and provides signals which are proportional to a speed of vibrations of the pipes of said housing, and an electronic block connected with the electromagnetic excitation unit and with the electromagnetic adapters determines a mass flow rate of a fluid, a correction associated with inclusions in the fluid and constituted by a ratio of a voltage amplitude of the adapters and a voltage amplitude of excitation of vibrations by the electromagnetic excitation unit, and a corrected mass flow rate of the fluid based on the determined mass flow and the determined correction.

Abstract: A method of modelling a fractured reservoir having application for petroleum reservoir development is disclosed utilizing a set of several families of equivalent blocks of regular shapes and sizes. The fractured reservoir is modelled by a complex porous medium made up of irregular blocks. A function defining the progress of an imbibition front within these blocks, whose derivative A?(X) is calculated, is determined. A function defining the progress of an imbibition front within regular equivalent blocks, whose derivative A?eq(X) is calculated, is then determined. This derivative, which constitutes at least two line segments with distinct slopes, depends on the dimensions of the equivalent blocks. Finally, the dimensions of the equivalent blocks are obtained by adjusting the two derivatives A?eq(X) and A?(X).

Abstract: An apparatus includes an operating conditions module that interprets a number of compressor operating parameters; a compressor flow module that determines a compressor inlet flow in response to the number of compressor operating parameters; and a fresh air flow module that provides a fresh air flow value in response to the compressor inlet flow. The operating conditions module further interprets a current mass air flow value, and the apparatus further includes a mass air flow sensor trimming module that adjusts a mass air flow sensor drift value in response to the current mass air flow value and the fresh air flow value. The apparatus includes a diagnostics module that determines a mass air flow sensor is failed in response to the current mass air flow value and the fresh air flow value.

Abstract: A biosensor calibration method configured to measure a concentration of a specific substance contained in sample liquid to be measured, including: a first step configured to acquire a first output value that is output by the biosensor when first calibration liquid is brought into contact with the biosensor; a second step configured to acquire a second output value that is output by the biosensor when second calibration liquid having a different concentration from that of the first calibration liquid is continuously brought into contact with the biosensor after the first step and determine time for replacement of the biosensor on the basis of the first output value and the second output value.