CN103185614B - There is the differential flow converter of multirange and automatic range switching function - Google Patents
There is the differential flow converter of multirange and automatic range switching function Download PDFInfo
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- CN103185614B CN103185614B CN201310050433.3A CN201310050433A CN103185614B CN 103185614 B CN103185614 B CN 103185614B CN 201310050433 A CN201310050433 A CN 201310050433A CN 103185614 B CN103185614 B CN 103185614B
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Abstract
The present invention is a kind of differential flow converter with multiple range and automatic range switching function, be characterized in: convert input differential pressure signal to electric signal by sensing element, through amplifying and analog to digital conversion, be modulated into digital signal and deliver to singlechip microprocessor, by the cooperation control of control program, linearization is carried out to signal, compensate, calculate, self diagnosis, Control on Communication, set by multirange, the multilevel iudge of measured value and adjacent range eigenwert, carry out automatic range switching, DC current signal is exported or digital signal shows again through D/A conversion unit and digital output unit, and be transferred to secondary instrument.By the in good time switching of range, measured value is operated near the higher limit of corresponding range of transmitter always, thus reduces measurement relative error, improve accuracy of measurement, promote transmitter quality.
Description
Technical field
The present invention relates to instrument field, is a kind of differential flow converter with multirange and automatic range switching function.
Background technology
The function of differential flow converter (hereinafter referred to as transmitter) mainly converts electric signal in order to state-variables such as the flows by liquid, gas and carries out process variable display, and be transferred to the measurement or control that display, recorder or computing machine realize fluids process parameter, in commercial measurement and energy field, there is widespread use.
Two the key technical indexes of transmitter measure range and accuracy of measurement, and range is one section of surveying work region in the input signal measurement range specified by transmitter, and associated is range ratio.It refers to the ratio of maximum range and minimum range in measurement range, and the good intelligent transmitter range ratio of general performance can reach 100:1 or higher.The measurement range of such as transmitter is 0-1-100kPa, and its maximum range is 0-100kPa minimum range is 0-1kPa, and range ratio is 100:1, and range ratio shows that more greatly the available scope of transmitter range is larger.Although current transmitter has very large range ratio, can only select and fix one of them range to be used as work range in measurement range.
The accuracy fiducial error definition of transmitter, fiducial error=
.And by relative error formula: relative error=
known, in transmitter range, the measurement relative error of each point is different, only have the measurement relative error of range upper change point identical with fiducial error, accuracy rating can be reached, and the relative error of other point is greater than accuracy rating in range, it is larger that measurement point departs from range upper limit measurement relative error.Take range as 0-100kPa, the transmitter of 0.075% grade is example, the permission absolute error in its gamut is 0.075kPa, and the relative error at maximum range 100kPa place is also 0.075%; And be also 3.75kPa place at 3.75% of range, the measurement relative error of differential pressure transmitter is 0.075/0.375=2%.And for having the flow transmitter of 0.075 grade of accuracy of extracting operation function, measuring relative error when flow reduces to 19.36% of full scale and being increased to 1% by 0.075%.If turn the range of transmitter in this case down, whether accuracy can be improved, be all example, if now the range of differential pressure transmitter is adjusted to 1/10th original (namely range becomes 0-10kPa), permission absolute error then in gamut is also reduced to original 1/10th, is 0.0075kPa; Measure relative error when tested force value is 3.75kPa and be reduced to 0.0075/3.75=0.2%, obviously bring up to 0.2% by 2% relative to original wide range situation accuracy of measurement, improve 10 times, the situation of flow transmitter is herewith similar.
It can thus be appreciated that, select suitable range and make measured value when working close to range Near The Upper Limit, higher accuracy of measurement can be obtained.But transmitter only has a fixing range at present, when measured flux fluctuation range is comparatively large or use wide range transmitter to measure low discharge, a range can't resolve large-scale accuracy of measurement problem, the industrial way sometimes adopting a measured parameter to install two cover flowmeters, investment is caused to increase, nonetheless its range overlay area is still limited, the accuracy that impact is measured.The present invention is directed to the deficiency in current transmitter performance, design the differential flow converter with multirange and automatic range switching function.
The transmitter of current routine has higher accuracy class and very large range ratio, but only has one to use range.Due to transmitter characteristic cause the measurement relative error of its each working point in range to be greater than accuracy rating, range upper change point is measured relative error and is equaled accuracy rating, measured value departs from the range upper limit, and then measuring error is larger, often exceeds the accuracy requirement of measuring process.
Summary of the invention
The object of the invention is, for the above-mentioned drawback of current conventional transmitter, design a kind of differential flow converter in whole measurement range with multiple range and automatic range switching function, make measured value be operated near the higher limit of corresponding range always, reduce the relative error measured, improve accuracy of measurement.
Realizing the technical scheme that the object of the invention takes is: a kind of differential flow converter with multiple range and automatic range switching function, it is characterized in that: convert input differential pressure signal to electric signal by sensing element, through amplifying and analog to digital conversion, be modulated into digital signal and deliver to singlechip microprocessor, by the cooperation control of control program, linearization is carried out to signal, compensate, calculate, self diagnosis, Control on Communication, set by multirange, the multilevel iudge of measured value and adjacent range eigenwert, carry out automatic range switching, DC current signal is exported or digital signal shows again through D/A conversion unit and digital output unit, and be transferred to secondary instrument.
Described multirange is whole or is divided into several different use ranges according to flow value or force value in part measurement range, and arranges each range code and coefficient of ranger.
Described measured value and the eigenwert of place range and the eigenwert of other range are compared judgement, and meet and be more than or equal to, or automatically carry out the switching between corresponding range after being less than or equal to condition, eigenwert is any value within the scope of specified measurement.
The multilevel iudge relation of described measured value and adjacent range eigenwert, the mathematical relation of automatic range switching and control program, mathematical relation comprises: with same Lower Range for starting point or the multirange partition mode that is starting point with different Lower Range, coefficient of ranger pattern, subsidiary condition pattern when range switches.
The differential flow converter with multiple range and automatic range switching function of the present invention, can according to measurement and controling parameters and changeover program, and microprocessor calls and performs, thus completes the automatic switchover of range.Its function embodiment possessed exists:
1. accept to store the setting of each range in measurement range and code identification from operator by interface, and energising acquiescence range is set.Such as: measurement range is the transmitter of 0-1-100kPa, to being divided into 10 range sections between its 0-1kPa to 0-100kPa, 01 represents 0-100kPa, 02 represents 0-50kPa...10 and represents 0-1kPa etc., and after energising, acquiescence range is 01;
2. arranging of each range needs synchronously carrying out the timing signal of each range, applies with the standard differential pressure value of each range, confirm, and automatically calculate generation coefficient of ranger by transmitter internal processes, determine input/output relation to corresponding range transmitter;
3. accept and store range changeover program and other measurement and controling parameters, as amplitude and the rate of change of the measured value continual and steady time before range switching, change, these parameters are referred to as the subsidiary condition that range switches, and all above parameters are stored in eeprom memory to avoid having a power failure loses;
4. control program regularly scanned contents of program according to the time cycle of operation, compared judgement to the measured value collected in adjacent range eigenwert, to determine whether to need to carry out range switching;
5. the measured value before and after transmitter switches range and in handoff procedure calculates and shows, and transmit, displayed value can be differential pressure, pressure or flow etc., also can be DC current or voltage signal, signal transmission form can be that digital communication mode or DC simulation export and load digital signaling, and transferring content is measurement data after automatic range switching and range handover information;
6. can by arranging multirange and automatic range switching makes transmitter obtain high accuracy in whole measurement range, its same performance compensation to a certain element of transmitter and correction are different, being under the constant prerequisite of transmitter original physical performance, reducing measuring error by reducing range.
Accompanying drawing explanation
Fig. 1 is the block diagram of the differential flow converter with multiple range and automatic range switching function;
Fig. 2 is that the whole of the differential flow converter with multiple range and automatic range switching function or part measurement range are divided into several range schematic diagram;
Fig. 3 is the slope schematic diagram of the input-output characteristic curve of each range of the differential flow converter with multiple range and automatic range switching function;
Fig. 4 is that the range of the differential flow converter with multiple range and automatic range switching function switches control flow schematic diagram.
embodiment
With reference to Fig. 1, the input differential pressure signal with the differential flow converter of multiple range and automatic range switching function of the present invention is through sensing element 1, be converted into electric signal and give amplification and A/D AD conversion unit 2, signal after modulation delivers to singlechip microprocessor 3, controling parameters and control program are stored in eeprom memory 4, the linearization of signal is realized by the exchanges data of same microprocessor 3, compensate, range judges to switch, self diagnosis, program stores and controls, then DC current signal or digital signal is exported to secondary instrument 6 through D/A D/A conversion unit 5.Specific works principle is, input differential pressure signal is converted to electric signal by sensing element 1, pass through amplification and the analog to digital conversion of amplification and A/D AD conversion unit 2, be modulated into digital signal and deliver to singlechip microprocessor 3, controling parameters and control program are stored in eeprom memory 4, by the cooperation control of control program, linearization is carried out to signal, compensate, calculate, self diagnosis, Control on Communication, set by multirange, the multilevel iudge of measured value and adjacent range eigenwert, carry out automatic range switching, and range switches display and the digital communication function of rear measured value, digital-to-analog conversion and numeral output DC current signal or digital signal is carried out to secondary instrument 6 again through D/A D/A conversion unit 5.Described multirange is whole or is divided into several different use ranges according to flow value or force value in part measurement range, and arranges each range code and coefficient of ranger.Described measured value and the eigenwert of place range and the eigenwert of other range are compared judgement, and meet and be more than or equal to, or automatically carry out the switching between corresponding range after being less than or equal to condition, eigenwert is any value within the scope of specified measurement.The multilevel iudge relation of described measured value and adjacent range eigenwert, the mathematical relation of automatic range switching and control program, mathematical relation comprises: with same Lower Range for starting point or the multirange partition mode that is starting point with different Lower Range, coefficient of ranger pattern, subsidiary condition pattern when range switches.
Typical case's typical circuit formation is exemplified as: differential pressure sensing element 1 is capacitance type sensor; The A/D module of amplification and A/D AD conversion unit 2 is MAX1400 chip; Microprocessor 3 is PIC16C73 single-chip microcomputer; The D/A module of D/A D/A conversion unit 5 is AD421 chip.
With reference to Fig. 2, multirange is arranged and automatic range switching function is between measurement range lower limit and the upper limit, the whole of transmitter or part measurement range are divided into several ranges, and it can be that wide range contains small-range with same Lower Range for range starting point that this range divides.
With reference to Fig. 3, determine the coefficient of ranger of each range, coefficient of ranger is the slope of the input-output characteristic curve of each range, k=tan α=(maximum output-minimum output)/(the range upper limit-Lower Range).The coefficient of ranger of range 1-n is respectively K1, K2, K3 ... Kn.
With reference to Fig. 4, when transmitter works under current range, with the relation of these coefficient of ranger determination input and output.And by programmed control to the eigenwert (being generally range higher limit) of current measurement value and place range and compare successively with the eigenwert of the adjacent range being less than place range and judge, whether overflow place range higher limit, or whether be less than the higher limit of adjacent range.If it is the most important condition that range switches is met, the subsidiary condition such as the stabilization time needed for switching range again, amplitude of variation and rate of change judge, after satisfying condition, program works under automatically transmitter being switched to this range, and carries out signal output with the coefficient of ranger under this range.Under new work range, proceed multilevel iudge and switching afterwards, by that analogy, make transmitter change along with measured value and automatically carry out range switching.By the in good time switching of range, measured value is operated near the higher limit of corresponding range of transmitter always.
The specific embodiment of the present invention is only an instantiation, but and non exhaustive, those skilled in the art without creative work simple copy and improve all belong to the claims in the present invention protection scope.
Claims (2)
1. one kind has the differential flow converter of multiple range and automatic range switching function, it comprises: sensing element, A/D AD conversion unit, singlechip microprocessor, eeprom memory, D/A digital-to-analog conversion and digital communication unit, input differential pressure signal is converted to electric signal by sensing element, through amplifying and analog to digital conversion, be modulated into digital signal and deliver to singlechip microprocessor, by the cooperation control of control program, linearization is carried out to signal, compensate, calculate, self diagnosis, Control on Communication, set by multirange, the multilevel iudge of measured value and adjacent range eigenwert, carry out automatic range switching, DC current signal is exported or digital signal shows again through D/A conversion unit and digital output unit, and be transferred to secondary instrument, it is characterized in that:
(1) whole or part measurement range is interior is divided into several different use ranges according to flow value or force value, each range code and coefficient of ranger are set, the multirange partition mode that is starting point with same Lower Range, is stored the setting of each range in measurement range and code identification by interface;
(2) to the measured value collected and place range eigenwert, and the eigenwert of the adjacent range being less than place range compares judgement successively, whether overflow place range higher limit, or whether be less than the higher limit of adjacent range, if it is the most important condition that range switches is met, stabilization time needed for again subsidiary condition range being switched, amplitude of variation and rate of change judge, after satisfying condition, program works under automatically transmitter being switched to this range, and carry out signal output with the coefficient of ranger under this range, multilevel iudge and switching is proceeded afterwards under new work range, by that analogy, transmitter is made to change along with measured value and automatically carry out range switching, by the in good time switching of range, measured value is operated near the higher limit of corresponding range of transmitter always.
2. a kind of differential flow converter with multiple range and automatic range switching function according to claim 1, it is characterized in that: the needs that arrange of each range are synchronously carrying out the timing signal of each range, transmitter is applied with the standard differential pressure value of each range, corresponding range is confirmed, and automatically calculate generation coefficient of ranger by transmitter internal processes, determine input/output relation, coefficient of ranger is the slope of the input-output characteristic curve of each range.
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| CN103335678A (en) * | 2013-07-24 | 2013-10-02 | 中环天仪股份有限公司 | Control method for automatically switching measuring ranges of electromagnetic flowmeter |
| CN104090068A (en) * | 2014-01-03 | 2014-10-08 | 力合科技（湖南）股份有限公司 | Self-adaption method for measuring range of detection instrument |
| CN104748831B (en) * | 2015-03-23 | 2017-08-25 | 沈阳新一代信息技术有限公司 | A kind of weighing sensor multrirange millivolt signal conversion equipment and method |
| CN105784018A (en) * | 2016-04-19 | 2016-07-20 | 毕托巴（上海）科技有限公司 | Differential pressure transmitter |
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| CN107167190A (en) * | 2017-06-29 | 2017-09-15 | 神雾环保技术股份有限公司 | The wide-range differential pressure flow detection means and method of two-flow scope |
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| CN110989463A (en) * | 2019-12-24 | 2020-04-10 | 北京金迈捷科技有限公司 | Online measurement range switching system and method |
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| CN112104364B (en) * | 2020-09-02 | 2022-09-23 | 霍丁格必凯(苏州)电子测量技术有限公司 | Analog signal transmitter and frequency signal calibration method thereof |
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| CN112903000A (en) * | 2021-03-26 | 2021-06-04 | 歌尔光学科技有限公司 | Sensor control method, sensor control device and storage medium |
| CN113432680B (en) * | 2021-06-08 | 2023-09-01 | 中广核工程有限公司 | Nuclear power plant reactor coolant system flow calibration method |
| CN113484655B (en) * | 2021-09-07 | 2022-01-25 | 西安热工研究院有限公司 | Redundant measurement line-crossing detection method, system and storage medium |
| CN115078798B (en) * | 2022-07-26 | 2022-11-22 | 武汉格蓝若智能技术有限公司 | Current range switching method and current collecting device |
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