CN108204865A - Industrial instrument, industrial control system and RTD temp measuring methods - Google Patents
Industrial instrument, industrial control system and RTD temp measuring methods Download PDFInfo
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- CN108204865A CN108204865A CN201611187468.1A CN201611187468A CN108204865A CN 108204865 A CN108204865 A CN 108204865A CN 201611187468 A CN201611187468 A CN 201611187468A CN 108204865 A CN108204865 A CN 108204865A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
Abstract
The present invention relates to industrial instruments.The industrial instrument of the present invention includes the first instrument that fluid is allowed to pass through and the RTD temperature measuring equipments for measuring the temperature for the fluid for flowing through first instrument, including：RTD devices are arranged as being in direct contact with fluid or contact to provide and the relevant resistivity measurements of fluid temperature (F.T.) with the tube wall of pipeline that fluid flows through；It is connected with RTD devices with the cable for transmitting electric power and signal；It is arranged as providing the temperature sensor with the relevant sensing temperature value of environment temperature residing for cable；And the means for correcting being connect with RTD devices and temperature sensor communication, the resistance corrected value of cable resistance is represented based on the offer of sensing temperature value, and RTD resistance actual values are provided based on resistivity measurements and resistance corrected value.The industrial instrument of the present invention realizes the temperature survey of high accuracy using the measurement resistance of RTD devices is corrected with the relevant temperature value of environment temperature.The present invention also provides a kind of industrial control systems and the RTD temp measuring methods of industrial instrument.
Description
Technical field
The present invention relates to the industrial instruments and its temp measuring method of industry control operation, and in particular to including thermometer resistor
(RTD) industrial instrument and corresponding RTD temp measuring methods.
Background technology
The content of this part provide only with the relevant background information of the disclosure, the prior art may not formed.
Industrial instrument is the commonly used equipment in live industry control operation.Can be that industrial instrument is arranged when being related to temperature survey
Thermometer resistor (Resistor Temperature Detector, hereinafter referred RTD) carries out temperature survey.RTD is numerous
A kind of relatively accurate method in temp measuring method can be used for measuring the temperature of the fluid media (medium) in various production processes.RTD
The resistance of device and the temperature of measured medium have determining functional relation, and the resistance value measured by RTD devices can obtain
The temperature of measured medium.
Two-wire system mensuration is a kind of common RTD temp measuring methods.In this method, using both threads cable by RTD devices
It is connected with excitation power supply, electric current is provided to RTD devices, and voltage is measured in the connecting part of excitation power supply by excitation power supply, from
And obtain the resistance of RTD devices.This method is easy and saves wiring, but there are problems that measurement accuracy.Utilize this side
When formula measures RTD resistance, the resistance value of cable itself can be included in the RTD resistance values measured, so as to the actual resistance value with RTD devices
Difference, thus influence measurement accuracy.This problem is more prominent in remote industrial instrument application, because of required length of cable
Can be very long, cause cable resistance can bigger to the interference of measured RTD resistance values.
It is, therefore, desirable to provide a kind of scheme that can be solved the above problems.
Invention content
It is an object of the present invention to provide industrial instruments, can carry out the temperature survey of high accuracy.
It is a further object to provide a kind of industrial instruments, and wiring is simple, can reduce wiring cost, and subtract
Few wiring space.
A further object of the present invention is to provide a kind of industry control system of the industrial instrument including according to the above-mentioned aspect of the present invention
System.
It is also another object of the present invention to provide a kind of RTD temp measuring methods of industrial instrument, can carry out high precision
The temperature survey of degree.
One or more of above-mentioned purpose can be realized by following industrial instruments, including allowing fluid process
First instrument and the RTD temperature measuring equipments for measuring the temperature for the fluid for flowing through first instrument, RTD temperature measuring equipments include：
RTD devices, the tube wall for being arranged as the pipeline for being in direct contact or being arranged as to flow through with fluid with fluid contact, with provide with
The relevant resistivity measurements of temperature of fluid；Cable is connected to transmit electric power and signal with RTD devices；Temperature sensor,
It is arranged as providing and the relevant sensing temperature value of environment temperature residing for cable；Means for correcting, with RTD devices and temperature sensing
Device communicates to connect, to represent the resistance corrected value of cable resistance based on the offer of sensing temperature value, and based on resistivity measurements and
Resistance corrected value provides the RTD resistance actual values for calculating fluid temperature (F.T.).
Using the above scheme, the measurement resistance that RTD devices are corrected with the relevant temperature value of environment temperature can be utilized, from
And realize the temperature survey of high accuracy.Said program does not need to additional wiring to correct the measurement resistance of RTD devices, can be with
Save wiring cost and the space occupied.Also, since the temperature with environmental correclation is easy to get, said program has good
Good practicability.
Preferably, temperature sensor is arranged as direct sense ambient temperature, and sensing temperature value is ambient temperature value.
Preferably, means for correcting includes：Corrected value determining module, based on the ambient temperature value provided from temperature sensor
Determine resistance corrected value；Resistance value determining module determines mould based on the resistivity measurements provided from RTD devices and self-correcting positive value
The resistance corrected value that block provides determines RTD resistance actual values.
Preferably, temperature sensor is arranged as indirect sense ambient temperature, has between sensing temperature value and ambient temperature value
There is deterministic dependence.
Preferably, means for correcting includes：Temperature conversion module, it is true based on the instrument temperature value provided from temperature sensor
Determine ambient temperature value；Corrected value determining module determines that resistance corrects based on the ambient temperature value provided from temperature conversion module
Value；Resistance value determining module, the resistance provided based on the resistivity measurements provided from RTD devices and self-correcting positive value determining module
Corrected value determines RTD resistance actual values.
Preferably, above-mentioned industrial instrument further includes the second instrument being connect via cable with first instrument, temperature sensor
The temperature being arranged as in sensing second instrument determines ambient temperature value as instrument temperature value, and by instrument temperature value.
Preferably, means for correcting is arranged in second instrument.
Preferably, temperature sensor and means for correcting are integrated on the circuit board in second instrument.
Preferably, temperature sensor is the thermo-sensitive resistor being integrated on the circuit board in second instrument, and thermo-sensitive resistor detects
The temperature of circuit board in itself.
Preferably, thermo-sensitive resistor is additionally operable to pre- to be more than in the temperature of circuit board to the temperature of monitoring system output circuit plate
Alarm signal is sent out during definite value.
Preferably, RTD devices are the temperature-sensing probe or temperature-sensitive resistance piece being arranged in first instrument.
Preferably, RTD devices and cable are formed as one part.
Preferably, cable is copper wire cable.
Preferably, RTD temperature measuring equipments further include temperature computing device, and temperature computing device is provided based on self-correcting equipment
RTD resistance actual value calculates fluid temperature (F.T.).
Preferably, temperature computing device is incorporated into means for correcting.
Preferably, industrial instrument further includes the third instrument being connected with second instrument.
Preferably, industrial instrument is flowmeter, and wherein first instrument is flow sensor, and second instrument is transmitter.
A kind of industrial control system is additionally provided according to another aspect of the present invention, includes the industrial instrument of the above-mentioned aspect of the present invention
Table and the control device for the power supply of industrial instrument power supply and with industrial instrument communication connection.
A kind of RTD temp measuring methods of industrial instrument, wherein industrial instrument are additionally provided according to another aspect of the invention
Including the first instrument that fluid is allowed to pass through, this RTD temp measuring method includes the following steps：
A) temperature phase with fluid is provided by RTD devices associated with first instrument and the cable being connect with RTD devices
The resistivity measurements of pass；
B) the relevant sensing temperature value of temperature with the environment residing for cable is provided by temperature sensor；
C) the resistance corrected value of cable resistance is represented based on the offer of sensing temperature value by means for correcting, to correct resistance survey
Magnitude, and then the RTD resistance actual values for calculating fluid temperature (F.T.) are obtained based on resistivity measurements and resistance corrected value.
Preferably, sensing temperature value is the instrument temperature value in the second instrument being connected with first instrument, above-mentioned steps c)
Further comprise：
C1 ambient temperature value) is determined based on instrument temperature value；
C2 resistance corrected value) is determined based on ambient temperature value；
C3 RTD resistance actual values) are determined based on resistance corrected value and resistivity measurements.
Various embodiments according to the present invention can be further appreciated that in detailed description below.
Description of the drawings
By description referring to the drawings, the feature and advantage of one or several embodiments of the invention will become more
Add and be readily appreciated that, wherein：
Fig. 1 shows the schematic block diagram of the industrial control system using the industrial instrument according to embodiment of the present invention；
Fig. 2 shows the schematic block diagrams of the RTD temperature measuring equipments according to embodiment of the present invention；
Fig. 3 shows influence of the environment temperature to cable resistance and fluid temperature (F.T.)；
Fig. 4 is the chart for showing the relationship between environment temperature and cable resistance；
Fig. 5 is the chart for showing environment temperature and the relationship of circuit board temperature；
Fig. 6 is the RTD device specification figures for the relationship for showing RTD resistance values and fluid temperature (F.T.)；
Fig. 7 shows in cross section the RTD devices according to embodiment of the present invention；
Fig. 8 is the partial enlarged view of the RTD devices in Fig. 7；
Fig. 9 is the side cross-sectional, view of the RTD devices in Fig. 7；
Figure 10 shows an embodiment of the industrial control system using the industrial instrument according to embodiment of the present invention；With
And
Figure 11 shows the another embodiment of the industrial control system using the industrial instrument according to embodiment of the present invention.
Specific embodiment
Description related to the preferred embodiment is only exemplary below, and is definitely not to the present invention and its application or usage
Limitation.In various figures the same reference numerals are used to designate identical component, therefore the construction of same parts will not
Repeat description.
Industrial instrument according to the embodiment of the present invention is described referring to Fig. 1 to Figure 11, will mainly describe industry
RTD temperature measuring equipments and its temp measuring method in instrument.It should be noted that in the accompanying drawings, a width figure can be it is comprehensive,
I.e., it would be possible to numerous embodiments embody in a width figure, distinguished between different embodiments with solid box and dotted line frame.
The frame diagram of the industrial control system including the industrial instrument according to embodiment of the present invention is shown in Fig. 1.This industry control
The main part of system includes the industrial instrument 100 indicated with click and sweep wire frame and power supply 200 and control device 300.Specifically
Ground, industrial instrument 100 can include first instrument 110 and the second instrument 120 being attached thereto via cable 160.It also, can
Selection of land can also include the third instrument being also connected with second instrument 120 according to the industrial instrument 100 of embodiment of the present invention
170, it is indicated in Fig. 1 with dotted line frame.Therefore, an example of industrial instrument 100 according to the present invention is illustrated that in Fig. 1
The comprehensive embodiment of property.According to different design requirements, can only be wrapped according to the industrial instrument 100 of embodiment of the present invention
First instrument 110 is included, second instrument 120 and third instrument 170 are all optional composition parts, in the case, 200 He of power supply
Control device 300 can directly be connected with first instrument 110.
Particularly, included measuring the stream for flowing through first instrument 110 according to the industrial instrument of embodiment of the present invention 100
The RTD temperature measuring equipments 101 of the temperature of body (gas or liquid).Fig. 2 schematically shows an embodiment party according to the present invention
The structure diagram of the RTD temperature measuring equipments 101 of formula, wherein representing RTD temperature measuring equipments 101 with the part that click and sweep wire frame indicates.Such as Fig. 2
Shown, RTD temperature measuring equipments 101 mainly include RTD devices 130, temperature sensor 140 and means for correcting 150, and can also wrap
It includes to provide exciting current to RTD devices 130 and transmit the cable 160 (referring to Fig. 1, being not shown in Fig. 2) of signal.
Specifically, RTD devices 130 are used for providing and the relevant RTD resistivity measurements R of fluid temperature (F.T.)It surveys, RTD devices 130 can
The tube wall of pipeline for being in direct contact or being arranged as with the fluid for being arranged as and flowing through first instrument 110 to flow through with fluid connects
It touches, to provide this resistivity measurements RIt surveys.For example, RTD devices 130 can be arranged to and the fluid line in first instrument 110
Tube wall contacts or is arranged as contacting with the tube wall of the fluid line outside first instrument 110.Cable 160 can be arranged to
RTD devices 130 are connected to transmit electric power and signal.Electric power can come from external power supply 200 or can come from other instrument
The electronic device of (in the case where industrial instrument 100 includes multiple instrument) inside, such as circuit board.140 cloth of temperature sensor
Offer and the relevant sensing temperature value of temperature of the environment residing for cable 160 are set to, this sensing temperature value can directly be measured
Ambient temperature value can also be with environment temperature have deterministic dependence other temperature values.For example, sensing temperature value and ring
Deterministic dependence between the temperature value of border can be mapping relations, linear relationship, curved line relation etc..Means for correcting 150 is used for base
In sensing temperature value to RTD resistivity measurements RIt surveysIt is corrected, for this purpose, means for correcting 150 is arranged to and RTD devices 130 and temperature
Degree sensor 140 communicates to connect, to receive RTD resistivity measurements RIt surveysWith sensing temperature value, and then carried based on sensing temperature value
For resistance corrected value RSchool, and based on resistivity measurements RIt surveysWith resistance corrected value RSchoolRTD resistance actual values R is providedVery, utilize this RTD
Resistance actual value RVeryThe temperature for the fluid for flowing through first instrument 110 can be accurately calculated, so as to eliminate 160 self-resistance of cable
The error brought improves measurement accuracy.
The error that RTD detection resistances are already indicated above in background of invention is mainly derived from the electricity of connection cables itself
Resistance.In order to eliminate this influence of cable resistance, need from RTD resistance detection values RIt surveysIt is middle to remove the cable resistance for bringing error,
This requirement measures cable resistance using ad hoc fashion.Presently, there are a kind of scheme be using individual power circuit measure line
Cable resistance, for example, known three-wire system and four-wire system RTD temp measuring methods in the industry.However three-wire system and four-wire system RTD temp measuring methods
It is required that increase with the comparable additional wirings of length of connection cables, additional wiring not only can occupied space, can also increase wiring
Cost.Another scheme is to use two-wire system RTD temp measuring methods, but to measure cable resistance in advance, and to be based on this cable electricity
It hinders to correct RTD resistance values.However, in practical applications, the temperature of the use environment of industrial instrument is not unalterable, work
Condition changes or four seasons replacement can all cause environment temperature to change, and the variation of environment temperature can cause cable resistance also to become therewith
Change.During using two-wire system RTD thermometrics, the cable resistance of correction is unable to real-time update, therefore cannot eliminate because of environment temperature band
The measurement error come.
RTD temperature measuring equipments 101 in the above embodiment of the present invention can then solve the problems, such as these, can not only provide with
Three-wire system and the comparable measurement accuracy of four-line measurement, and additional wiring need not be increased, save wiring cost.The present invention
People has found there is determining relationship, and phase between environment temperature and cable resistance when research influences the various factors of RTD resistance
Ground is answered to influence the measurement resistance of RTD.The table of Fig. 3 shows influence of the environment temperature to cable resistance and fluid being measured temperature
If one example from figure 3, it can be seen that using 25 DEG C of reference values as environment temperature, changes and to high temperature to low temperature
Change the error that all cable resistance can be caused different degrees of, so as to cause the different degrees of error of fluid measurement temperature.Fig. 4's
Chart shows an example of the deterministic dependence between environment temperature and cable resistance, and X-axis represents environment temperature, Y-axis table
Show cable resistance, it is from the example of Fig. 4 it can be seen that substantially linear between cable resistance and environment temperature.As a result, originally
Inventors herein propose a kind of scheme of new acquisition cable resistance error：It is obtained and the environment residing for cable using temperature sensor
The relevant temperature value of temperature, and then cable resistance value is obtained based on this temperature value, then from RTD resistance detection values RIt surveysMiddle removal
This cable resistance value is (that is, the resistance corrected value R of cableSchool) obtain true RTD resistance values RVery。
This scheme proposed by the present invention is particularly advantageous remote industrial instrument.Utilizing remote industrial instrument
In the case of, for connecting the connection cables of instrument often up to tens meters or even rice up to a hundred, if increasing the length with connection cables
Spend comparable additional wiring, then not only can occupied space, can also dramatically increase wiring cost.It is proposed in embodiments of the present invention
Conceptual design be based on environment temperature obtain cable resistance value, do not need to additional wiring, it is only necessary to arrange to provide ring
The temperature sensor of border temperature.Three lines are actually combined according to the above-mentioned RTD temperature measuring equipments 101 of embodiment of the present invention
It is high, of low cost and convenient practical to provide a kind of accuracy for the advantages of system/four-wire system thermometric mode is with two-wire system thermometric mode
RTD temperature measurement schemes.
It is the explanation of principle to the RTD temperature measuring equipments 101 according to embodiment of the present invention and essential structure mode above,
The numerous embodiments of RTD temperature measuring equipments 101 are further described below.
According to root an embodiment of the invention embodiment, the temperature sensor 140 of RTD temperature measuring equipments 101 is arranged as directly feeling
Environment temperature is surveyed, in the case, sensing temperature value is ambient temperature value TRing.In this embodiment, temperature sensor
140 can be arranged at any position of industrial instrument 100, as long as the temperature of the ambient enviroment residing for cable can be obtained i.e.
It can.
Based on this embodiment, means for correcting 150 can be structured as including corrected value determining module 152 and resistance value determines
Module 153 shows the two modules and corresponding signal flow direction in Fig. 2.Corrected value determining module 152 is configured to based on next
From the ambient temperature value T of temperature sensor 140RingTo determine resistance corrected value RSchool.Resistance value determining module 153 is based on from RTD devices
The 130 resistivity measurements R providedIt surveysAnd the resistance corrected value R from corrected value determining module 152SchoolTo determine that RTD resistance is true
Value RVery。
In another embodiment, temperature sensor 140 can be arranged to close with the component part of industrial instrument 100
Connection, and environment temperature is provided based on the temperature of this associated section.It is proposed this embodiment be because the present inventors have noted that
There is determining relationship between environment temperature and the temperature of industrial instrument 100.
For example, in one embodiment according to the present invention, industrial instrument 100 further includes other than first instrument 110
Via the second instrument 120 that cable 160 is connect with first instrument 110, as shown in fig. 1.Inventor notices second instrument 120
There are deterministic relationship between interior temperature and environment temperature, Fig. 5 shows an example of this relationship, wherein X-axis table
Show instrument temperature, Y-axis represents environment temperature, is shown in figure between the temperature and environment temperature in second instrument 120 substantially into line
Sexual intercourse.In such a case, it is possible to environment temperature is obtained based on the temperature in second instrument 120.It for this purpose, can be by temperature
Sensor 140 is arranged as the temperature in sensing second instrument 120, then sensing temperature value is instrument temperature value TInstrument.Temperature sensor
140 can be arranged at any appropriate position in second instrument 120.
Based on this embodiment, means for correcting 150 can be retrofited based on configuration described above mode.In addition to school
Positive value determining module 152 and resistance value determining module 153, the means for correcting 150 of this embodiment further include temperature conversion module
151.Temperature conversion module 151 is used for the instrument temperature value T for measuring temperature sensor 140It surveysBe converted to ambient temperature value TRing.Into
And the ambient temperature value T that corrected value determining module 152 is provided based on temperature conversion module 151RingDetermine resistance corrected value RSchool, resistance
It is worth determining module 153 and is based on resistivity measurements RIt surveysAnd resistance corrected value RSchoolDetermine RTD resistance actual values RVery.It is also showed that in Fig. 2
This configuration of means for correcting 150, wherein optional temperature conversion module 151 is shown with dotted line frame.
In both above embodiment, RTD resistance actual values R is being obtainedVeryAfterwards, the RTD device specifications in Fig. 6
Figure is based on RTD resistance actual values RVeryObtain corresponding fluid temperature values.Due to eliminating the influence of cable resistance, RTD at this time
There to be ideal correspondence between resistance and fluid temperature (F.T.).
Alternatively, principle according to the present invention, RTD temperature measuring equipments 101 can also include special temperature computing device
154, it is true that this temperature computing device 154 is based on the RTD resistance that means for correcting 150 (specifically, resistance value determining module 153) provides
Value RVeryTo calculate fluid temperature (F.T.).
Preferably, temperature computing device 154 may be integrally incorporated in means for correcting 150, as shown in Figure 2.
Further, principle according to the present invention, means for correcting 150 can be structured as independent component or can integrate
In first instrument 110 or second instrument 120.In the embodiment for being arranged in second instrument 120 in temperature sensor 140, school
Equipment 150 can also be disposed in second instrument 120.Fig. 1 shows that temperature sensor 140 and means for correcting 150 are all arranged
Configuration in second instrument 120, since temperature sensor 140 and means for correcting 150 can also construct and be independent component, because
Temperature sensor 140 and means for correcting 150 are shown with dotted line frame in this Fig. 1.
In the case where temperature sensor 140 and means for correcting 150 are all disposed in second instrument 120, in a facility
Embodiment in, temperature sensor 140 and means for correcting 150 can be directly integrated on the circuit board of second instrument 120.
Particularly, temperature sensor 140 is the thermo-sensitive resistor being integrated on the circuit board in second instrument 120, this thermo-sensitive resistor is used for
The temperature of detection circuit plate in itself is using as instrument temperature value TInstrument.Preferably, thermo-sensitive resistor is also designed to for control
Equipment 300 exports the sensing temperature of the circuit board of second instrument 120 to send out alarm when the temperature of circuit board is more than predetermined value
Signal.(151,152,153 and 154 etc.) as escribed above can for all parts or module of means for correcting 150 and/or means for correcting
To be formed on circuit boards in the form of single or multiple integrated circuits or special circuit.In addition, principle according to the present invention, school
Equipment 150 can be realized in the form of software or program code, at this point, means for correcting 150 can be in control device 300
The computer program of operation.
RTD devices 130 are also shown in Fig. 1 can be arranged in first instrument 110, and first instrument 110 is flowed through to measure
Fluid temperature (F.T.).Specifically, RTD devices 130 may be arranged to the temperature-sensing probe in first instrument 110, for example, it may be
The temperature-sensing probe of PT100 types.Certainly, RTD devices 130 can also be other temperature sensing devices, such as temperature-sensitive resistance piece.And RTD devices
Part 130 can be arranged near first instrument 110 rather than must be necessarily arranged inside it, therefore indicate RTD in Fig. 1 with dotted line frame
Device 130.
In addition, also showing optional third instrument 170 in Fig. 1, corresponding RTD devices can be arranged in third instrument 170
Part 180.
For RTD devices 130 of the present invention, conventional RTD devices may be used.Fig. 7 shows the one of RTD devices 130
Kind embodiment.
As shown in Figure 7, RTD devices 130 include end head 131, from end head 131 draw two leads 132,133,
And it is coated on the insulating protective layer 134 outside end 131 and lead 132,133.Fig. 8 and Fig. 9 shows 131 part of end
Amplification sectional view.The encapsulating portion that end 131 includes temperature-sensitive resistance piece 131a and is arranged in outside temperature-sensitive resistance piece 131a is shown in figure
131b.For example, temperature-sensitive resistance piece 131a can be made of platinum, lead 132,133 can be silver-plated copper wire, and be coated with poly- four
Vinyl fluoride (PTFE) insulating layer.Between the operating temperature range of this RTD devices 130 is -200 DEG C~200 DEG C.
In actual use, the lead of RTD devices 130 132,133 is connected to cable 160, specifically, is connected to cable
The sub-line cable for RTD devices in 160.In general, a plurality of sub-line cable can be included in cable 160, it is used for transmission from difference
The signal and electric power of device.Specifically, cable 160 can be copper wire cable.In a kind of convenient embodiment, RTD devices
Part 130 and cable 160 can be formed as one part, and in this case, cable 160 can include two root cables, for respectively
It is connected to the lead 132,133 of RTD devices 130.
It should be noted that Fig. 3 mentioned above is all based on drawing for certain material to table shown in Fig. 6 and chart
What line 160 and RTD devices 130 obtained, for example, Fig. 3 and Fig. 4 is obtained based on 30 meters long of copper cable, the chart of Fig. 5 is based on
820 type circuit boards obtain, and RTD device of the chart in Fig. 6 based on PT100 types obtains.These tables and chart are exemplary
Ground shows the relationship between environment temperature, cable resistance and fluid temperature (F.T.), and is not intended to limit the RTD resistance of the present invention
Correcting mode.According to the variation that material and element design, the functional relation shown in figure can also change correspondingly.The reality of these variations
Mode is applied similarly to cover within the scope of this invention.
In a special specific embodiment, industrial instrument 100 can be flowmeter, first instrument 110 therein
Can be the flow measurement instrument that fluid is allowed to pass through, for example flow sensor, second instrument 120 can be for converting and passing
Send the transmitter of the signal from flow sensor.In addition, in the case of including third instrument 170, third instrument 170 can be with
For another flow sensor.Certainly, the implementation of the present invention is not limited to this specific example, any industry using RTD thermometrics
Instrument can cover within the scope of the invention.
Based on the principle of the present invention, corresponding industrial control system is additionally provided, is mainly included according to embodiment of the present invention
Industrial instrument 100 and for industrial instrument 100 power power supply 200 and with industrial instrument communication connection control device
300.The frame diagram of this industrial control system is shown in Fig. 1.Figure 10 and Figure 11 shows two kinds of works of the structure diagram based on Fig. 1
Control system.The industrial control system of Figure 10 includes 110, second instruments 120 of a first instrument, power supply 200 and control device
300.In this example, RTD devices 130 can be arranged in inside first instrument 110.The industrial control system of Figure 11 difference lies in
Third instrument 170 is further included, correspondingly RTD devices 180 can also be arranged in inside third instrument 170.In this example, third
Instrument 170 and first instrument 110 can be the instrument of same type or different types of instrument.
In addition, based on the principle of the present invention, a kind of new-type RTD thermometrics for above-mentioned industrial instrument 100 are additionally provided
Method, the method specifically may comprise steps of：
A) by being provided with 110 associated RTD devices 130 of first instrument and the cable 160 being connect with RTD devices 130
With the relevant resistivity measurements R of fluid temperature (F.T.)It surveys；
B) it is provided and the relevant sensing temperature value of environment temperature by temperature sensor 140；
C) the resistance corrected value R of cable resistance is represented based on the offer of sensing temperature value by means for correcting 150SchoolTo correct electricity
Hinder measured value RIt surveys, and then it is true for calculating the RTD resistance of fluid temperature (F.T.) to obtain based on measurement resistance value and resistance corrected value
Value RVery。
Above-mentioned steps a) with b) can synchronous progress can also sequentially carry out.
As previously described, the sensing temperature value in above-mentioned steps b) can be the second instrument being connected with first instrument 110
Instrument temperature value T in table 120Instrument.Based on this, step c) further comprises：
C1) based on instrument temperature value TInstrumentDetermine ambient temperature value TRing；
C2) based on ambient temperature value TRingDetermine resistance corrected value RSchool；
C3) based on resistance corrected value RSchoolWith resistivity measurements RIt surveysDetermine RTD resistance actual values RVery。
In the case where sensing temperature value is ambient temperature value, above-mentioned step c1 can be omitted.In step c3) in, base
In formula RVery=RIt surveys-RSchoolTo determine RTD resistance actual values.
The present invention method be not limited to above-mentioned specific steps, in case of an implementation in software, as long as obtain with
The relevant sensing value of environment temperature can obtain RTD resistance actual values by changing algorithm with less or more step
RVery。
Although various embodiments of detailed description of the present invention herein, it should be appreciated that the invention is not limited in this
In the specific embodiment being described in detail and show, without departing from the spirit and scope of the present invention can be by this field
Technical staff realizes other modifications and variant.All these modifications and variant are within the scope of the present invention.It is moreover, all
Component described here can be replaced by component equivalent in other technologies.
Claims (20)
1. a kind of industrial instrument (100), which is characterized in that including allowing the first instrument (110) of fluid process and for surveying
Amount flows through the RTD temperature measuring equipments (101) of the temperature of the fluid of the first instrument (110), the RTD temperature measuring equipments
(101) include：
RTD devices (130), the tube wall of pipeline for being arranged as being in direct contact with the fluid or flowing through with the fluid connect
It touches, to provide the relevant resistivity measurements (R of temperature with the fluidIt surveys)；
Cable (160) is connected to transmit electric power and signal with the RTD devices (130)；
Temperature sensor (140) is arranged as providing and the relevant sensing temperature value of environment temperature residing for cable；And
Means for correcting (150) is communicated to connect with the RTD devices (130) and the temperature sensor (140), to be based on
State the resistance corrected value (R that the offer of sensing temperature value represents the resistance of the cable (160)School), and based on the resistance measurement
It is worth (RIt surveys) and the resistance corrected value (RSchool) provide to calculate the RTD resistance actual values (R of fluid temperature (F.T.)Very)。
2. industrial instrument (100) according to claim 1, which is characterized in that the temperature sensor (140) is arranged as directly
The sensing environment temperature is connect, the sensing temperature value is ambient temperature value (TRing)。
3. industrial instrument (100) according to claim 2, which is characterized in that the means for correcting (150) includes：
Corrected value determining module (152), based on the ambient temperature value (T provided from the temperature sensor (140)Ring) really
The fixed resistance corrected value (RSchool)；
Resistance value determining module (153), based on the resistivity measurements (R provided from the RTD devices (130)It surveys) and from
Resistance corrected value (the R that the corrected value determining module (152) providesSchool) determine the RTD resistance actual value (RVery)。
4. industrial instrument (100) according to claim 1, which is characterized in that between the temperature sensor (140) is arranged as
Meet the sensing environment temperature, the sensing temperature value and ambient temperature value (TRing) between have deterministic dependence.
5. industrial instrument (100) according to claim 4, which is characterized in that the means for correcting (150) includes：
Temperature conversion module (151) determines environment based on the sensing temperature value provided from the temperature sensor (140)
Temperature value (TRing)；
Corrected value determining module (152), based on the ambient temperature value (T provided from the temperature conversion module (151)Ring)
Determine the resistance corrected value (RSchool)；
Resistance value determining module (153), based on the resistivity measurements (R provided from the RTD devices (130)It surveys) and from
Resistance corrected value (the R that the corrected value determining module (152) providesSchool) determine the RTD resistance actual value (RVery)。
6. industrial instrument (100) according to claim 5, which is characterized in that further include via the cable (160) and institute
The second instrument (120) of first instrument (110) connection is stated, the temperature sensor (140) is arranged as sensing the second instrument
(120) temperature in is as instrument temperature value (TInstrument) and pass through the instrument temperature value (TInstrument) determine the ambient temperature value
(TRing)。
7. industrial instrument (100) according to claim 6, which is characterized in that the means for correcting (150) is arranged in described
In second instrument (120).
8. industrial instrument (100) according to claim 7, which is characterized in that the temperature sensor (140) and the school
Equipment (150) is integrated on the circuit board in the second instrument (120).
9. industrial instrument (100) according to claim 8, which is characterized in that the temperature sensor (140) is is integrated in
The thermo-sensitive resistor on circuit board in the second instrument (120), the thermo-sensitive resistor detect the temperature of the circuit board in itself.
10. industrial instrument (100) according to claim 9, which is characterized in that the thermo-sensitive resistor is additionally operable to monitoring system
System exports the temperature of the circuit board to send out alarm signal when the temperature of the circuit board is more than predetermined value.
11. industrial instrument (100) according to any one of claim 1 to 10, which is characterized in that the RTD devices
(130) temperature-sensing probe or temperature-sensitive to be arranged in the first instrument (110) hinder piece.
12. industrial instrument (100) according to any one of claim 1 to 10, which is characterized in that the RTD devices
(130) and the cable (160) is formed as one part.
13. industrial instrument (100) according to any one of claim 1 to 10, which is characterized in that the cable (160)
For copper wire cable.
14. industrial instrument (100) according to any one of claim 1 to 10, which is characterized in that the RTD thermometrics dress
It puts (101) and further includes temperature computing device (154), the temperature computing device (154) from the means for correcting (150) based on carrying
The RTD resistance actual value (R suppliedVery) calculate the fluid temperature (F.T.).
15. industrial instrument (100) according to claim 14, which is characterized in that the temperature computing device (154) is integrated
In the means for correcting (150).
16. the industrial instrument (100) according to any one of claim 6 to 10, which is characterized in that the industrial instrument
(100) the third instrument (170) being connected with the second instrument (120) is further included.
17. the industrial instrument (100) according to any one of claim 6 to 10, which is characterized in that the industrial instrument
(100) it is flowmeter, wherein the first instrument (110) is flow sensor, the second instrument (120) is transmitter.
18. a kind of industrial control system, which is characterized in that including the industrial instrument according to any one of claim 1 to 17
(100) and it is the power supply (200) of the industrial instrument (100) power supply and the control with the industrial instrument (100) communication connection
Control equipment (300).
19. the RTD temp measuring methods of a kind of industrial instrument, which is characterized in that the industrial instrument (100) is including allowing fluid to pass through
The first instrument (110) crossed, the described method comprises the following steps：
A) pass through RTD devices (130) associated with the first instrument (110) and the cable being connect with the RTD devices (130)
(160) the relevant resistivity measurements (R of temperature with the fluid is providedIt surveys)；
B) the relevant sensing temperature value of temperature with the environment residing for the cable (160) is provided by temperature sensor (140)；
And
C) the resistance school of the resistance of the cable (160) is represented based on sensing temperature value offer by means for correcting (150)
Positive value (RSchool) to correct the resistivity measurements (RIt surveys), and then based on the resistivity measurements (RIt surveys) and the resistance corrected value
(RSchool) obtain the RTD resistance actual values (R for calculating fluid temperature (F.T.)Very)。
20. RTD temp measuring methods according to claim 19, which is characterized in that the sensing temperature value be and described first
Instrument temperature value (T in the connected second instrument (120) of instrument (110)Instrument), the step c) further comprises：
C1) based on the instrument temperature value (TInstrument) determine ambient temperature value (TRing)；
C2) based on the ambient temperature value (TRing) determine the resistance corrected value (RSchool)；
C3) based on the resistance corrected value (RSchool) and the resistivity measurements (RIt surveys) determine the RTD resistance actual value (RVery)。
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Application publication date: 20180626 |