CN206583553U - Industrial instrument and industrial control system - Google Patents
Industrial instrument and industrial control system Download PDFInfo
- Publication number
- CN206583553U CN206583553U CN201621404205.7U CN201621404205U CN206583553U CN 206583553 U CN206583553 U CN 206583553U CN 201621404205 U CN201621404205 U CN 201621404205U CN 206583553 U CN206583553 U CN 206583553U
- Authority
- CN
- China
- Prior art keywords
- temperature
- instrument
- rtd
- resistance
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model is related to industrial instrument.Industrial instrument of the present utility model includes the first instrument for allowing fluid to pass through and for the RTD temperature measuring equipments for the temperature for measuring the fluid for flowing through first instrument, and it includes：RTD devices, its tube wall for being arranged as the pipeline for directly contacting or being flowed through with fluid with fluid contacts to provide the resistivity measurements related with fluid temperature (F.T.)；It is connected to transmit the cable of electric power and signal with RTD devices；It is arranged as providing the temperature sensor of the sensing temperature angle value related to the environment temperature residing for cable；And the means for correcting being connected with RTD devices and temperature sensor communication, it provides the resistance corrected value for representing cable resistance based on sensing temperature angle value, and provides RTD resistance actual values based on resistivity measurements and resistance corrected value.This industrial instrument corrects the measurement resistance of RTD devices using the temperature value related to environment temperature, realizes the temperature survey of high accuracy.The utility model additionally provides a kind of industrial control system.
Description
Technical field
The utility model is related to the industrial instrument of industry control operation, and in particular to include thermometer resistor (RTD) industry
The industrial control system of instrument and correlation.
Background technology
The content of this part provide only the background information related to the disclosure, and it may not constitute prior art.
Industrial instrument is the common equipment in live industry control operation.Can be industrial instrument arrangement when being related to temperature survey
Thermometer resistor (Resistor Temperature Detector, hereinafter referred RTD) carries out temperature survey.RTD is many
A kind of relatively accurate method in many temp measuring methods, it can be for measuring the temperature of the fluid media (medium) in various production processes.
The resistance of RTD devices and the temperature of measured medium have a functional relation determined, the resistance value measured by RTD devices, can be with
Obtain the temperature of measured medium.
Two-wire system mensuration is a kind of conventional 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 by excitation power supply, and voltage is measured at the wiring of excitation power supply, from
And obtain the resistance of RTD devices.This method is easy and saves wiring, but the problem of there is measurement accuracy.Utilize this side
When formula measures RTD resistance, the resistance of cable itself can be included in the RTD resistance values measured, so that the true resistance with RTD devices
Value is different, thus influence measurement accuracy.This problem is more protruded in remote industrial instrument application, because required cable is long
Degree can be very long, causes interference of the cable resistance to measured RTD resistance values can be bigger.
It is, therefore, desirable to provide a kind of scheme that can solve the problem that above mentioned problem.
Utility model content
A purpose of the present utility model is to provide a kind of industrial instrument, and it can carry out the temperature survey of high accuracy.
Another purpose of the present utility model is to provide a kind of industrial instrument, and it is connected up simply, can reduce wiring cost,
And reduce wiring space.
Another purpose of the present utility model is to provide a kind of industrial instrument including according to the above-mentioned aspect of the utility model
Industrial control system.
Further object of the present utility model is to provide a kind of RTD temp measuring methods of industrial instrument, and it can carry out height
The temperature survey of the degree of accuracy.
One or more of above-mentioned purpose can realize that it includes allowing what fluid passed through by following industrial instruments
First instrument and for the RTD temperature measuring equipments for the temperature for measuring the fluid for flowing through first instrument, RTD temperature measuring equipments include：
RTD devices, it is arranged as directly contacting with fluid, or the tube wall of pipeline for being arranged as flowing through with fluid is contacted, with provide with
The related resistivity measurements of the temperature of fluid；Cable, it is connected to transmit electric power and signal with RTD devices；Temperature sensor, its
It is arranged as providing the sensing temperature angle value related to the environment temperature residing for cable；Means for correcting, itself and RTD devices and TEMP
Device is communicated to connect, and the resistance corrected value of cable resistance is represented to be provided based on sensing temperature angle value, and based on resistivity measurements and
Resistance corrected value provides the RTD resistance actual values for calculating fluid temperature (F.T.).
Using such scheme, it is possible to use the temperature value related to environment temperature corrects the measurement resistance of RTD devices, from
And realize the temperature survey of high accuracy.Such scheme need not be extra wiring correct the measurement resistance of RTD devices, can be with
Save wiring cost and the space taken.Also, because the temperature with environmental correclation is readily available, thus such scheme have it is good
Good practicality.
Preferably, temperature sensor is arranged as direct sense ambient temperature, and sensing temperature angle value is ambient temperature value.
Preferably, means for correcting includes：Corrected value determining module, it is based on the ambient temperature value provided from temperature sensor
Determine resistance corrected value；Resistance determining module, it is based on the resistivity measurements and self-correcting provided from RTD devices on the occasion of it is determined that mould
The resistance corrected value that block is provided determines RTD resistance actual values.
Preferably, temperature sensor is arranged as indirect sense ambient temperature, has between sensing temperature angle 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, it determines that resistance is corrected based on the ambient temperature value provided from temperature conversion module
Value；Resistance determining module, its resistance provided based on the resistivity measurements and self-correcting that are provided from RTD devices on the occasion of determining module
Corrected value determines RTD resistance actual values.
Preferably, above-mentioned industrial instrument also includes the second instrument being connected via cable with first instrument, temperature sensor
The temperature for being arranged as sensing in 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, thermo-sensitive resistor detection
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 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 form as one part.
Preferably, cable is copper cash cable.
Preferably, RTD temperature measuring equipments also 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 also includes the 3rd 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 utility model, it includes the above-mentioned aspect of the utility model
Industrial instrument and the power supply powered for industrial instrument and the control device communicated to connect with industrial instrument.
A kind of RTD temp measuring methods of industrial instrument are additionally provided according to another aspect of the present utility model, wherein industry
Instrument includes the first instrument for allowing fluid to pass through, and this RTD temp measuring method comprises the following steps：
A) cable being connected by the RTD devices that are associated with first instrument and with RTD devices provides the temperature phase with fluid
The resistivity measurements of pass；
B) the sensing temperature angle value related to the temperature of the environment residing for cable be provided by temperature sensor；
C) the resistance corrected value for representing cable resistance is provided based on sensing temperature angle value by means for correcting, to correct resistance survey
Value, and then obtain the RTD resistance actual values for calculating fluid temperature (F.T.) based on resistivity measurements and resistance corrected value.
Preferably, sensing temperature angle 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.
It can be further appreciated that in detailed description below according to various embodiments of the present utility model.
Brief description of the drawings
By description referring to the drawings, the feature and advantage of one or several embodiments of the present utility model will become
Obtain easier to understand, wherein：
Fig. 1 shows the schematic structure frame of the industrial control system using the industrial instrument according to the utility model embodiment
Figure；
Fig. 2 shows the schematic block diagram of the RTD temperature measuring equipments according to the utility model embodiment；
Fig. 3 is the chart for showing the relation between environment temperature and cable resistance；
Fig. 4 is the chart for showing environment temperature and the relation of circuit board temperature；
Fig. 5 is the RTD device specification figures for the relation for showing RTD resistance values and fluid temperature (F.T.)；
Fig. 6 show in cross section the RTD devices according to the utility model embodiment；
Fig. 7 be Fig. 6 in RTD devices partial enlarged drawing；
Fig. 8 be Fig. 6 in RTD devices side cross-sectional, view；
Fig. 9 shows an embodiment party of the industrial control system using the industrial instrument according to the utility model embodiment
Formula；And
Figure 10 shows another implementation of the industrial control system using the industrial instrument according to the utility model embodiment
Mode.
Embodiment
Description related to the preferred embodiment is only exemplary below, and be definitely not to the utility model and its application or
The limitation of usage.Adopt in various figures and identical part is denoted by the same reference numerals, therefore the construction of same parts
It will not be repeated again.
The industrial instrument according to embodiment of the present utility model is described referring to Fig. 1 to Figure 10, will mainly be described
RTD temperature measuring equipments and its temp measuring method in industrial instrument.It should be noted that in the accompanying drawings, a width figure can be comprehensive
, i.e. will likely numerous embodiments embodied in a width figure, area is come with solid box and dotted line frame between different embodiments
Point.
The frame diagram of the industrial control system including the industrial instrument according to the utility model embodiment is shown in Fig. 1.This
The main part of industrial control system includes the industrial instrument 100 and power supply 200 and control device 300 indicated with dot-dash wire frame.Tool
Body, industrial instrument 100 can include first instrument 110 and the second instrument 120 being attached thereto via cable 160.And
And, alternatively, it can also include what is be also connected with second instrument 120 according to the industrial instrument 100 of the utility model embodiment
3rd instrument 170, it is indicated with dotted line frame in Fig. 1.Therefore, it is illustrated that in Fig. 1 according to industrial instrument of the present utility model
A 100 exemplary comprehensive embodiment.According to different design requirements, according to the work of the utility model embodiment
Industry instrument 100 can only include first instrument 110, and the instrument 170 of second instrument 120 and the 3rd is all optional composition part,
In this case, power supply 200 and control device 300 directly can be connected with first instrument 110.
Especially, included flowing through first instrument 110 for measurement according to the industrial instrument 100 of the utility model embodiment
Fluid (gas or liquid) temperature RTD temperature measuring equipments 101.Fig. 2 is schematically shown according to of the present utility model one
The structured flowchart of the RTD temperature measuring equipments 101 of individual embodiment, wherein the part indicated with dot-dash wire frame represents RTD temperature measuring equipments
101.As shown in Fig. 2 RTD temperature measuring equipments 101 mainly include RTD devices 130, temperature sensor 140 and means for correcting 150,
And it can also include being used to provide exciting current to RTD devices 130 and transmit the cable 160 of signal (referring to Fig. 1, in Fig. 2 not
Show).
Specifically, RTD devices 130 are used for providing the RTD resistivity measurements R related to fluid temperature (F.T.)Survey, RTD devices 130 can
To be arranged as directly contacting with flowing through the fluid of first instrument 110, or the tube wall of pipeline for being arranged as flowing through with fluid is contacted,
To provide this resistivity measurements RSurvey.Such as, RTD devices 130 can be arranged to the pipe with the fluid line in first instrument 110
Wall is contacted, or is arranged as contacting with the tube wall of the fluid line outside first instrument 110.Cable 160 can be arranged to and RTD
Device 130 is connected to transmit electric power and signal.Electric power can come from external power source 200, or can come from other instrument (
In the case that industrial instrument 100 includes multiple instrument) internal electronic device, such as circuit board.Temperature sensor 140 is arranged as
The sensing temperature angle value related to the temperature of the environment residing for cable 160 is provided, this sensing temperature angle value can be the ring directly measured
Border temperature value can also be other temperature values for having deterministic dependence with environment temperature.Such as, sensing temperature angle value and environment temperature
Deterministic dependence between angle value can be mapping relations, linear relationship, curved line relation etc..Means for correcting 150 is used for based on sense
Thermometric angle value is to RTD resistivity measurements RSurveyIt is corrected, therefore, means for correcting 150 is arranged to and RTD devices 130 and temperature biography
Sensor 140 is communicated to connect, to receive RTD resistivity measurements RSurveyWith sensing temperature angle value, and then based on sensing temperature angle value provide electricity
Hinder corrected value RSchool, and based on resistivity measurements RSurveyWith 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 calculated exactly, brought so as to eliminate the self-resistance of cable 160
Error, improve measurement accuracy.
The error that RTD detection resistances are already indicated above in the utility model background technology is mainly derived from connection cables itself
Resistance.In order to eliminate this influence of cable resistance, it is necessary to from RTD resistance detection values RSurveyIt is middle to remove the cable electricity for bringing error
Resistance, this requires to measure cable resistance using ad hoc fashion.A kind of scheme that presently, there are is to utilize single power line drive test
Measure cable resistance, such as, known three-wire system and four-wire system RTD temp measuring methods in the industry.But three-wire system and four-wire system RTD are surveyed
Warm method requires the increase extra wiring suitable with the length of connection cables, extra wiring not only can space-consuming, can also increase
Plus wiring cost.Another scheme is to use two-wire system RTD temp measuring methods, but to measure cable resistance in advance, and with based on this
Cable resistance corrects RTD resistance values.However, in actual applications, the temperature of the use environment of industrial instrument be not one one-tenth not
Become, working conditions change or four seasons replacement can all cause environment temperature to change, and the change of environment temperature can cause cable resistance
Also change therewith.During using two-wire system RTD thermometrics, the cable resistance of correction is unable to real-time update, therefore can not eliminate because of ring
The measurement error that border temperature band is come.
RTD temperature measuring equipments 101 in the above-mentioned embodiment of the utility model then can solve the problem that these problems, can not only carry
For the measurement accuracy suitable with four-line measurement with three-wire system, and extra wiring need not be increased, save wiring cost.This
Inventor has found there is the relation determined between environment temperature and cable resistance in the various factors of research influence RTD resistance,
And corresponding affect on RTD measurement resistance.Following form 1 shows environment temperature to cable resistance and fluid being measured temperature
One example of influence.
Form 1
If as can be seen that using 25 DEG C of reference values as environment temperature from form 1, changed to low temperature and to high temperature
Change can all cause the different degrees of error of cable resistance, so as to cause the different degrees of error of fluid measurement temperature.Fig. 3 figure
An example of the deterministic dependence between environment temperature and cable resistance is indicated, X-axis represents environment temperature, and Y-axis is represented
Cable resistance, it can be seen that substantially linear between cable resistance and environment temperature from Fig. 3 example.Thus, this hair
A person of good sense proposes a kind of scheme of new acquisition cable resistance error：Obtained and the environment temperature residing for cable using temperature sensor
Spend related temperature value, and then cable resistance value is obtained based on this temperature value, then from RTD resistance detection values RSurveyIt is middle to remove this
Cable resistance value (that is, the resistance corrected value R of cableSchool) obtain real RTD resistance values RVery。
The utility model proposes this scheme be particularly advantageous for remote industrial instrument.Utilizing remote industrial instrument
In the case of table, tens meters of even rice up to a hundred are often up to for connecting the connection cables of instrument, if increase and connection cables
The suitable extra wiring of length, then not only can space-consuming, can also dramatically increase wiring cost.Embodiment party of the present utility model
The conceptual design proposed in formula is to obtain cable resistance value based on environment temperature, it is not necessary to extra wiring, it is only necessary to which arrangement is used
In the temperature sensor for providing environment temperature.It is real according to the above-mentioned RTD temperature measuring equipments 101 of the utility model embodiment
The advantage of three-wire system/four-wire system thermometric mode and two-wire system thermometric mode is combined on border, and there is provided a kind of degree of accuracy is high, cost
Cheap and convenient practical RTD temperature measurement schemes.
It is the principle and essential structure mode to the RTD temperature measuring equipments 101 according to the utility model embodiment above
Illustrate, the numerous embodiments of RTD temperature measuring equipments 101 are further described below.
According to a root embodiment of the present utility model, the temperature sensor 140 of RTD temperature measuring equipments 101 is arranged as directly
Sense ambient temperature is connect, in the case, sensing temperature angle value is ambient temperature value TRing.In this embodiment, temperature is passed
Sensor 140 can be arranged at any position of industrial instrument 100, as long as resulting in the temperature of the surrounding environment residing for cable
.
Based on this embodiment, means for correcting 150, which can be structured as, includes corrected value determining module 152 and resistance is true
The two modules and corresponding signal flow direction are shown in cover half block 153, Fig. 2.Corrected value determining module 152 is configured to be based on
Ambient temperature value T from temperature sensor 140RingTo determine resistance corrected value RSchool.Resistance determining module 153 is based on from RTD devices
The resistivity measurements R that part 130 is providedSurveyAnd the resistance corrected value R from corrected value determining module 152SchoolTo determine that RTD resistance is true
Real value RVery。
In another embodiment, temperature sensor 140 can be arranged to the part pass with industrial instrument 100
Connection, and temperature based on this associated section provides environment temperature.Propose this embodiment be because the present inventors have noted that
There is the relation determined between environment temperature and the temperature of industrial instrument 100.
For example, according in an embodiment of the present utility model, industrial instrument 100 is in addition to first instrument 110, also
Including the second instrument 120 being connected via cable 160 with first instrument 110, as shown in fig. 1.The present inventors have noted that second
There is deterministic relation between temperature and environment temperature in instrument 120, Fig. 4 shows an example of this relation, its
Middle X-axis represents instrument temperature, and Y-axis represents to show in environment temperature, figure big between temperature and environment temperature in second instrument 120
Cause linear.In such a case, it is possible to obtain environment temperature based on the temperature in second instrument 120.Therefore, can be with
Temperature sensor 140 is arranged as to sense the temperature in second instrument 120, then sensing temperature angle 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.Except school
On the occasion of determining module 152 and resistance determining module 153, the means for correcting 150 of this embodiment also includes temperature conversion module
151.Temperature conversion module 151 is used for the instrument temperature value T for measuring temperature sensor 140InstrumentBe converted to ambient temperature value TRing。
And then, the ambient temperature value T that corrected value determining module 152 is provided based on temperature conversion module 151RingDetermine resistance corrected value RSchool,
Resistance determining module 153 is based on resistivity measurements RSurveyAnd resistance corrected value RSchoolDetermine RTD resistance actual values RVery.Also show in Fig. 2
This make of means for correcting 150 is gone out, 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 devices rule in Fig. 5
Trrellis diagram is based on RTD resistance actual values RVeryObtain corresponding fluid temperature values.Due to eliminating the influence of cable resistance, now
There to be preferable corresponding relation between RTD resistance and fluid temperature (F.T.).
Alternatively, according to principle of the present utility model, RTD temperature measuring equipments 101 can also include special temperature computation and fill
154 are put, the RTD resistance that this temperature computing device 154 is based on means for correcting 150 (specifically, resistance determining module 153) offer is true
Real 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, according to principle of the present utility model, means for correcting 150, or can be with it is so structured that independent part
It is incorporated into first instrument 110 or second instrument 120.The embodiment of second instrument 120 is arranged in temperature sensor 140
In, means for correcting 150 can also be disposed in second instrument 120.Fig. 1 shows temperature sensor 140 and means for correcting 150
Be all disposed within the configuration in second instrument 120, due to temperature sensor 140 and means for correcting 150 can also be configured to it is independent
Temperature sensor 140 and means for correcting 150 are shown with dotted line frame in part, therefore Fig. 1.
In the case where temperature sensor 140 and means for correcting 150 are all disposed within 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.It is special
Not, temperature sensor 140 is the thermo-sensitive resistor being integrated on the circuit board in second instrument 120, and this thermo-sensitive resistor is used for examining
The temperature of slowdown monitoring circuit plate in itself is to be used as instrument temperature value TInstrument.Preferably, thermo-sensitive resistor is also designed to be used to set to control
Standby 300 export the sensing temperature of the circuit board of second instrument 120 to send alarm signal when the temperature of circuit board is more than predetermined value
Number.The all parts or module (as escribed above 151,152,153 and 154 etc.) of means for correcting 150 and/or means for correcting can
To be formed on circuit boards in the form of single or multiple integrated circuits or special circuit.In addition, according to original of the present utility model
Reason, means for correcting 150 can realize that now, means for correcting 150 can be in control device in the form of software or program code
The computer program run in 300.
RTD devices 130 are also show 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 indicates RTD in Fig. 1 with dotted line frame
Device 130.
In addition, also show in Fig. 1 in optional 3rd instrument 170, the 3rd instrument 170 can arrange corresponding RTD devices
Part 180.
For the utility model RTD devices 130, it can be using conventional RTD devices.Fig. 6 shows RTD devices 130
A kind of embodiment.
As shown in Figure 6, 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 head 131 and lead 132,133.Fig. 7 and Fig. 8 show end head 131
Amplification sectional view.Show that end head 131 includes the encapsulating that temperature-sensitive hinders piece 131a and is arranged in outside temperature-sensitive resistance piece 131a in figure
Portion 131b.For example, temperature-sensitive resistance piece 131a can be made up of platinum, lead 132,133 can be silver-plated copper cash, and be coated with poly-
Tetrafluoroethene (PTFE) insulating barrier.The operating temperature range of this RTD devices 130 is between -200 DEG C~200 DEG C.
In actual use, the lead 132,133 of RTD devices 130 is connected to cable 160, specifically, cable is connected to
The sub-line cable for RTD devices in 160.Generally, a plurality of sub-line cable can be included in cable 160, for transmitting from difference
The signal and electric power of device.Specifically, cable 160 can be copper cash cable.In a kind of easily embodiment, RTD devices
Part 130 and cable 160 can form as one part, in this case, and 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 form and chart that form 1 mentioned above and Fig. 3 are shown into Fig. 5 are all based on spy
Determine what the lead 160 and RTD devices 130 of material were obtained, such as, form 1 and Fig. 3 are obtained based on copper cable 30 meters long, figure
4 chart is obtained based on 820 type circuit boards, and RTD device of the chart in Fig. 5 based on PT100 types is obtained.These forms and chart
The relation between environment temperature, cable resistance and fluid temperature (F.T.) is simply schematically illustrated, and is not intended to limit this reality
With new RTD resistance correcting modes.The functional relation shown in the change designed according to material and element, figure can also change therewith
Become.The embodiment of these changes similarly covers in scope of the present utility model.
In a special specific embodiment, industrial instrument 100 can be flowmeter, first instrument 110 therein
Can be to allow the flow measurement instrument that fluid passes through, such as flow sensor, second instrument 120 can be for changing and passing
Send the transmitter of the signal from flow sensor.In addition, in the case of including the 3rd instrument 170, the 3rd instrument 170 can be with
For another flow sensor.Certainly, embodiment not limited to this instantiation of the present utility model, any use RTD thermometrics
Industrial instrument can be covered in the range of the utility model.
Based on principle of the present utility model, corresponding industrial control system is additionally provided, it mainly includes according to the utility model
The industrial instrument 100 of embodiment and the power supply 200 powered for industrial instrument 100 and the control communicated to connect with industrial instrument
Control equipment 300.The frame diagram of this industrial control system is shown in Fig. 1.Fig. 9 and Figure 10 show the structured flowchart based on Fig. 1
Two kinds of industrial control systems.Fig. 9 industrial control system includes first instrument 110, second instrument 120, power supply 200 and control and set
Standby 300.In this example, RTD devices 130 can be arranged in inside first instrument 110.The difference of Figure 10 industrial control system
It is also to include the 3rd instrument 170, correspondingly RTD devices 180 can also be arranged in inside the 3rd instrument 170.In this example,
3rd instrument 170 and instrument or different types of instrument that first instrument 110 can be same type.
In addition, based on principle of the present utility model, additionally providing a kind of new-type RTD for above-mentioned industrial instrument 100
Temp measuring method, the method specifically may comprise steps of：
A) cable 160 being connected by the RTD devices 130 that are associated with first instrument 110 and with RTD devices 130 is provided
The resistivity measurements R related to fluid temperature (F.T.)Survey；
B) the sensing temperature angle value related to environment temperature be provided by temperature sensor 140；
C) the resistance corrected value R for representing cable resistance is provided by means for correcting 150 based on sensing temperature angle valueSchoolTo correct
Resistivity measurements RSurvey, and then it is true for the RTD resistance that calculates fluid temperature (F.T.) to obtain based on measurement resistance value and resistance corrected value
Real value RVery。
Above-mentioned steps a) and it b) can synchronously carry out sequentially carrying out.
As previously described, the sensing temperature angle 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) it is based on instrument temperature value TInstrumentDetermine ambient temperature value TRing；
C2) it is based on ambient temperature value TRingDetermine resistance corrected value RSchool；
C3) it is based on resistance corrected value RSchoolWith resistivity measurements RSurveyDetermine RTD resistance actual values RVery。
In the case where sensing temperature angle value is ambient temperature value, above-mentioned step c1 can be omitted.In step c3) in, base
In formula RVery=RSurvey-RSchoolTo determine RTD resistance actual values.
Method of the present utility model is not limited to above-mentioned specific steps, in case of an implementation in software, as long as obtaining
The sensing value related to environment temperature, can by changing algorithm, with it is less or more the step of it is to obtain RTD resistance true
Value RVery。
Although various embodiments of the present utility model have been described in detail herein, it should be appreciated that the utility model is not
The embodiment be described in detail and shown here is confined to, in the case of without departing from spirit and scope of the present utility model
It may be effected by one skilled in the art other modifications and variant.All these modifications and variant both fall within of the present utility model
In the range of.Moreover, all components described here can be equivalent in other technologies component replace.
Claims (18)
1. a kind of industrial instrument (100), it is characterised 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), its tube wall for being arranged as the pipeline for directly contacting or being flowed through with the fluid with the fluid connects
Touch, to provide the resistivity measurements (R related to the temperature of the fluidSurvey)；
Cable (160), it is connected to transmit electric power and signal with the RTD devices (130)；
Temperature sensor (140), it is arranged as providing the sensing temperature angle value related to the environment temperature residing for the cable；And
Means for correcting (150), it is communicated to connect with the RTD devices (130) and the temperature sensor (140), with based on institute
State the resistance corrected value (R that sensing temperature angle value provides the resistance for representing the cable (160)School), and based on the resistance measurement
It is worth (RSurvey) and the resistance corrected value (RSchool) RTD resistance actual values (R for calculating fluid temperature (F.T.) is providedVery)。
2. industrial instrument (100) according to claim 1, it is characterised in that the temperature sensor (140) is arranged as directly
The sensing environment temperature is connect, the sensing temperature angle value is ambient temperature value (TRing)。
3. industrial instrument (100) according to claim 2, it is characterised in that the means for correcting (150) includes：
Corrected value determining module (152), it is based on the ambient temperature value (T provided from the temperature sensor (140)Ring) really
The fixed resistance corrected value (RSchool)；
Resistance determining module (153), it is based on the resistivity measurements (R provided from the RTD devices (130)Survey) 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, it is characterised in that between the temperature sensor (140) is arranged as
Meet the sensing environment temperature, the sensing temperature angle value and ambient temperature value (TRing) between have deterministic dependence.
5. industrial instrument (100) according to claim 4, it is characterised in that the means for correcting (150) includes：
Temperature conversion module (151), its described sensing temperature angle value for being based on providing from the temperature sensor (140) determines described
Ambient temperature value (TRing)；
Corrected value determining module (152), it is based on the ambient temperature value (T provided from the temperature conversion module (151)Ring)
Determine the resistance corrected value (RSchool)；
Resistance determining module (153), it is based on the resistivity measurements (R provided from the RTD devices (130)Survey) 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, it is characterised in that also including 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 used 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, it is characterised in that the means for correcting (150) is arranged in described
In second instrument (120).
8. industrial instrument (100) according to claim 7, it is characterised 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, it is characterised in that the temperature sensor (140) is to be integrated in
The thermo-sensitive resistor on circuit board in the second instrument (120), the thermo-sensitive resistor detects the temperature of the circuit board in itself.
10. industrial instrument (100) according to claim 9, it is characterised in that the thermo-sensitive resistor is additionally operable to monitoring system
System exports the temperature of the circuit board to send 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, it is characterised in that the RTD devices
(130) temperature-sensing probe or temperature-sensitive the resistance piece to be arranged in the first instrument (110).
12. industrial instrument (100) according to any one of claim 1 to 10, it is characterised in that the RTD devices
(130) formed as one part with the cable (160).
13. industrial instrument (100) according to any one of claim 1 to 10, it is characterised in that the cable (160)
For copper cash cable.
14. industrial instrument (100) according to any one of claim 1 to 10, it is characterised in that the RTD thermometrics dress
Putting (101) also includes temperature computing device (154), and the temperature computing device (154) is based on carrying from the means for correcting (150)
The RTD resistance actual value (R suppliedVery) calculate the fluid temperature (F.T.).
15. industrial instrument (100) according to claim 14, it is characterised 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, it is characterised in that the industrial instrument
(100) the 3rd instrument (170) being connected with the second instrument (120) is also included.
17. the industrial instrument (100) according to any one of claim 6 to 10, it is characterised 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, it is characterised in that including the industrial instrument according to any one of claim 1 to 17
(100) power supply (200) and for the industrial instrument (100) powered and the control communicated to connect with the industrial instrument (100)
Control equipment (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621404205.7U CN206583553U (en) | 2016-12-20 | 2016-12-20 | Industrial instrument and industrial control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621404205.7U CN206583553U (en) | 2016-12-20 | 2016-12-20 | Industrial instrument and industrial control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206583553U true CN206583553U (en) | 2017-10-24 |
Family
ID=60108955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621404205.7U Active CN206583553U (en) | 2016-12-20 | 2016-12-20 | Industrial instrument and industrial control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206583553U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204865A (en) * | 2016-12-20 | 2018-06-26 | 高准有限公司 | Industrial instrument, industrial control system and RTD temp measuring methods |
-
2016
- 2016-12-20 CN CN201621404205.7U patent/CN206583553U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204865A (en) * | 2016-12-20 | 2018-06-26 | 高准有限公司 | Industrial instrument, industrial control system and RTD temp measuring methods |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2017334594B2 (en) | Heat flux sensor | |
| RU2453931C1 (en) | Improved temperature compensation of multivariate pressure gage | |
| US8864378B2 (en) | Process variable transmitter with thermocouple polarity detection | |
| CN208297003U (en) | Sensor capsule, temperature measurement component and temperature sensor | |
| JP5009374B2 (en) | Detection of temperature sensor configuration in a process variable transmitter | |
| US7963173B2 (en) | Magnetic flowmeter for measuring flow | |
| EP3586097B1 (en) | Thermocouple temperature sensor with cold junction compensation | |
| CN108204865A (en) | Industrial instrument, industrial control system and RTD temp measuring methods | |
| CN101198849A (en) | Determining and/or controlling a temperature | |
| CN206583553U (en) | Industrial instrument and industrial control system | |
| CN107132417A (en) | A kind of precision resister measuring method of reactive circuit parameter drift | |
| CN104515600B (en) | Infrared sensor | |
| US20230314239A1 (en) | Process fluid temperature estimation using improved heat flow sensor | |
| CN210108556U (en) | Calibration device of high-precision temperature measurement circuit for aerospace use | |
| Cvitaš et al. | Increasing accuracy of temperature measurement based on adaptive algorithm for microcontroller transmitter | |
| Class | Temperature measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |