CN208537050U - A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment - Google Patents
A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment Download PDFInfo
- Publication number
- CN208537050U CN208537050U CN201821309587.4U CN201821309587U CN208537050U CN 208537050 U CN208537050 U CN 208537050U CN 201821309587 U CN201821309587 U CN 201821309587U CN 208537050 U CN208537050 U CN 208537050U
- Authority
- CN
- China
- Prior art keywords
- multichannel
- resistance thermometer
- isolation module
- platinum resistance
- thermometer sensor
- 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
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipments, including acquisition unit, isolated location and MCU, acquisition unit connects MCU by isolated location, MCU connection power supply and communication interface, key and display module and relay output module, isolated location includes DC-DC isolation module, light-coupled isolation module and magnetic coupling isolation module, acquisition unit includes analog-digital converter, platinum resistance thermometer sensor, precision resister, external reference resistor, multichannel difference analogue channel and constant-current source, the utility model structural principle is simple, it is measured suitable for industrial temperature, it is relative to other measurement methods, the utility model strong antijamming capability, with temperature-compensating, self calibration, measurement accuracy is high, it can support multichannel while measure.
Description
Technical field
The utility model relates to thermometry field, specially a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment.
Background technique
Currently, the method for measurement temperature is broadly divided into two classes, one kind is contact temperature-measuring method, is mainly utilized with temperature
The electric parameter of variation, the thermometric mode of representative have thermocouple, Thermistor Temperature Measurement method and the temperature using thermally expansive thermometric
Meter, another kind of is contactless temp measuring method, mainly using heat radiation as representative.The former advantage be surveyed temperature be by
The true temperature of object is surveyed, measurement is simple and reliable, the disadvantage is that directly to contact, thermal balance is also required to the heat exchange of a period of time.
The latter is that the size of the wavelength and Energy distribution given off using body surface is carried out.
It expands thermometry and uses the mark of geometric sense (volume, length) as temperature.Most commonly utilize the body of liquid
Product changes the glass liquid thermometer to indicate temperature.Such as mercurial thermometer is the thermal expansion and contraction principle using mercury, is lacked
Point is easily broken, generation pollution, and measurement temperature range is limited, and thermal response is slow, and precision is low etc..
Constant-pressure gas thermometer keeps its pressure constant the gas of certain mass, the mark using volume as temperature.
It is served only for measurement thermodynamic temperature (see thermodynamic scale), is rarely used in actual temperature measurement.
Resistance thermometer measures temperature according to conductor resistance variation with temperature rule.Most common resistance thermometer is all
The temperature-sensing element turned to using wire.Mainly there are platinum resistance thermometer and copper electrical resistance thermometer.Under low temperature also using rhodium iron,
Carbon and Germanium thermometer.
Platinum resistance thermometer sensor, thermometric is divided into two-wire system, three-wire system and four-wire system according to scheme difference.The error of two-wire system carrys out self-conductance
Line resistance, conducting wire is longer, thinner error is bigger.Three-wire system can eliminate the influence of conductor resistance, but its principle is built upon three
On the basis of root conductor resistance is completely the same.Error will be generated if three conductor resistances are inconsistent, size and inconsistent
Degree it is related.Four-wire system can theoretically completely eliminate the influence of conducting wire.But actually still require conductor resistance as far as possible one
It causes.
Thermocouple measurement is using two kinds of different metals, and one end (measurement end) twists the other end (cold end) together with
The voltage difference at both ends can be induced, then obtains the environment temperature of cold end by other means, passes through meter of tabling look-up in conjunction with above data
Calculation mode you can get it measurement end temperature.
Utility model content
The purpose of this utility model is to provide a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipments, to solve above-mentioned back
The problem of being proposed in scape technology.
To achieve the above object, the utility model provides the following technical solutions: a kind of multichannel three-wire system platinum resistance thermometer sensor, survey
Warm device, including acquisition unit, isolated location and MCU, the acquisition unit connect MCU by isolated location, and the MCU connects
Power supply and communication interface, key and display module and relay output module are connect, the isolated location includes DC-DC isolation mode
Block, light-coupled isolation module and magnetic coupling isolation module, the light-coupled isolation module and magnetic coupling isolation module are bi-directionally connected MCU, institute
State DC-DC isolation module connection power supply and communication interface；
The acquisition unit includes analog-digital converter, platinum resistance thermometer sensor, precision resister, external reference resistor, multichannel difference
Analog channel and constant-current source, the constant-current source are arranged in analog-digital converter, and the analog-digital converter is bi-directionally connected light-coupled isolation
Module and magnetic coupling isolation module, the constant-current source connection DC-DC isolation module and multichannel difference analogue channel, the multichannel difference
Analog channel connects platinum resistance thermometer sensor, and the platinum resistance thermometer sensor, connects precision resister, and the precision resister is separately connected external base
Quasi- resistance and analog-digital converter, the external reference resistor connect analog-digital converter.
Preferably, the MCU uses model STM8S207 single-chip microcontroller.
Preferably, the analog-digital converter uses AD7792/AD7793 chip, includes two-way constant-current source.
Preferably, PT100 or PT1000 can be selected in the platinum resistance thermometer sensor, and multichannel difference analogue channel is selected
ADG709。
Compared with prior art, the utility model has the beneficial effects that the utility model structural principle is simple, it is suitable for work
The measurement of industry temperature, relative to other measurement methods, the utility model strong antijamming capability has temperature-compensating, and self calibration is surveyed
Accuracy of measurement is high, can support multichannel while measure；By processing unit and acquisition unit electrical isolation, avoid being drawn by power supply and communication
The interference risen, while anti-static ability is increased, it is hardly damaged, does not interact.Acquisition unit analog quantity all uses difference
Simulation input mode, platinum resistance thermometer sensor, input channel are biased clamper filtering processing；In addition, three-wire system testing scheme is usually used
Single electric current source is measured with bridge balance principle, and the present apparatus is in the case where hardware supported, using the double-current source to match each other
It measures.By the configuration different to its, can effectively weaken lead resistance it is inconsistent caused by error.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model.
In figure: 1, acquisition unit；2, isolated location；3,MCU；4, power supply and communication interface；5, key and display module；6,
Relay output module；7, DC-DC isolation module；8, light-coupled isolation module；9, magnetic coupling isolation module；10, analog-digital converter；
11, platinum resistance thermometer sensor,；12, precision resister；13, external reference resistor；14, multichannel difference analogue channel；15, constant-current source.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, the utility model provides a kind of technical solution: a kind of multichannel three-wire system platinum resistance thermometer sensor, thermometric dress
It sets, including acquisition unit 1, isolated location 2 and MCU3, MCU3 use model STM8S207 single-chip microcontroller；The acquisition unit 1
MCU3, the MCU3 connection power supply and communication interface 4, key and display module 5 are connected by isolated location 2 and relay is defeated
Module 6 out, the isolated location 2 include DC-DC isolation module 7, light-coupled isolation module 8 and magnetic coupling isolation module 9, the optocoupler
Isolation module 8 and magnetic coupling isolation module 9 are bi-directionally connected MCU3, and the DC-DC isolation module 7 connects power supply and communication interface 4；
The acquisition unit 1 includes analog-digital converter 10, platinum resistance thermometer sensor, 11, precision resister 12, external reference resistor 13, multichannel difference
Analog channel 14 and constant-current source 15, the constant-current source 15 are arranged in analog-digital converter 10, the two-way company of the analog-digital converter 10
Light-coupled isolation module 8 and magnetic coupling isolation module 9 are connect, the constant-current source 15 connects DC-DC isolation module 7 and multichannel difference analogue is logical
Road 14, multichannel difference analogue channel 14 connect platinum resistance thermometer sensor, 11, and the platinum resistance thermometer sensor, 11 connects precision resister 12, described
Precision resister 12 is separately connected external reference resistor 13 and analog-digital converter 10, and the external reference resistor 13 connects modulus and turns
Parallel operation 10.Analog-digital converter uses AD7792/AD7793 chip, includes two-way constant-current source；Platinum resistance thermometer sensor, 11 can be selected PT100 or
ADG709 is selected in PT1000, multichannel difference analogue channel 14.
In power supply processing, the extraneous offer any DC voltage of 8V ~ 24V is only needed, the present apparatus is first filtered with common mode inductance
Wave, then pressure stabilizing output fixed value voltage is carried out with linear stabilized power supply, it powers for device, and carried out again by DC isolated power supply
Isolation pressure stabilizing is to provide high stability power supply for acquisition unit.
In acquisition unit, constant current is exported to platinum by two matching constant current resources in high-precision analog-digital converter
Thermal resistance both ends return to analog-digital converter by precision resister and external reference resistor.Two matching constant current resources can be mutual
Exchange is not in non-matching phenomenon to ensure to be used for a long time, precision resister cooperate analog-digital converter internal reference power supply to
The current value for feeding back constant-current source, it is external when there is deviation after there is exception or long-term work aging to compensation current
The equally applicable precision resister of reference resistance, cooperation constant-current source are used as outside reference, can compensate for the electricity such as cable and chip
The temperature drift of sub- component.Platinum resistance thermometer sensor, lead uses three-wire system, can be good at error caused by compensating because of lead resistance.
In conclusion the utility model structural principle is simple, it is suitable for industrial temperature and measures, relative to other measurement sides
Formula, the utility model strong antijamming capability have temperature-compensating, and self calibration, measurement accuracy is high, can support multichannel while survey
Amount；By processing unit and acquisition unit electrical isolation, the interference caused by power supply and communication is avoided, while increasing antistatic energy
Power is hardly damaged, and is not interacted.Acquisition unit analog quantity all uses difference analogue input mode, and platinum resistance thermometer sensor, input is logical
Road is biased clamper filtering processing；In addition, three-wire system testing scheme is surveyed usually using single electric current source with bridge balance principle
Amount, the present apparatus are measured in the case where hardware supported using the double-current source to match each other.By different matching to its
Set, can effectively weaken lead resistance it is inconsistent caused by error.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (4)
1. a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment, including acquisition unit (1), isolated location (2) and MCU(3),
It is characterized by: the acquisition unit (1) connects MCU(3 by isolated location (2)), the MCU(3) connect power supply and communication
Interface (4), key and display module (5) and relay output module (6), the isolated location (2) includes DC-DC isolation mode
Block (7), light-coupled isolation module (8) and magnetic coupling isolation module (9), the light-coupled isolation module (8) and magnetic coupling isolation module (9) are equal
It is bi-directionally connected MCU(3), DC-DC isolation module (7) the connection power supply and communication interface (4)；The acquisition unit (1) includes
Analog-digital converter (10), platinum resistance thermometer sensor, (11), precision resister (12), external reference resistor (13), multichannel difference analogue channel
(14) it is arranged in analog-digital converter (10) with constant-current source (15), the constant-current source (15), the analog-digital converter (10) is two-way
Connect light-coupled isolation module (8) and magnetic coupling isolation module (9), constant-current source (15) connection DC-DC isolation module (7) and multichannel
Difference analogue channel (14), multichannel difference analogue channel (14) connect platinum resistance thermometer sensor, (11), and the platinum resistance thermometer sensor, (11) is even
It connecing precision resister (12), the precision resister (12) is separately connected external reference resistor (13) and analog-digital converter (10),
The external reference resistor (13) connects analog-digital converter (10).
2. a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that: the MCU
(3) model STM8S207 single-chip microcontroller is used.
3. a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that: the modulus
Converter uses AD7792/AD7793 chip, includes two-way constant-current source.
4. a kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment according to claim 1, it is characterised in that: the platinum heat
PT100 or PT1000 can be selected in resistance (11), and ADG709 is selected in multichannel difference analogue channel (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821309587.4U CN208537050U (en) | 2018-08-15 | 2018-08-15 | A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821309587.4U CN208537050U (en) | 2018-08-15 | 2018-08-15 | A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208537050U true CN208537050U (en) | 2019-02-22 |
Family
ID=65378912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821309587.4U Active CN208537050U (en) | 2018-08-15 | 2018-08-15 | A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208537050U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108380A (en) * | 2019-05-30 | 2019-08-09 | 无锡市百川科技股份有限公司 | A kind of precise temperature measurement system applied to biphenyl heater box in weaving elasticizer |
| CN111045358A (en) * | 2019-11-26 | 2020-04-21 | 杭州和利时自动化有限公司 | Data acquisition method, device, equipment and medium |
-
2018
- 2018-08-15 CN CN201821309587.4U patent/CN208537050U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108380A (en) * | 2019-05-30 | 2019-08-09 | 无锡市百川科技股份有限公司 | A kind of precise temperature measurement system applied to biphenyl heater box in weaving elasticizer |
| CN111045358A (en) * | 2019-11-26 | 2020-04-21 | 杭州和利时自动化有限公司 | Data acquisition method, device, equipment and medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105651409B (en) | Cold junction compensation temperature measurement circuit and device | |
| CN208537050U (en) | A kind of multichannel three-wire system platinum resistance thermometer sensor, temperature measuring equipment | |
| CN109613051B (en) | Device and method for measuring Seebeck coefficient of material by using contrast method | |
| CN110987239A (en) | Temperature measurement detection device for terminal base of electric energy meter | |
| CN105371976A (en) | Thermal resistance temperature measuring device and temperature measuring method | |
| CN113125048B (en) | Micro calorimeter capable of directly measuring thermocouple type power sensor and power reference system | |
| CN204788736U (en) | Calibration of online check gauge of industry is with thermocouple reference edge temperature compensated equipment | |
| CN204330183U (en) | A kind of Combined thermocouple assay furnace | |
| CN109282911A (en) | High precision measuring temperature probe and high precision measuring temperature instrument | |
| CN204165669U (en) | A kind of temperature voltage conversion equipment for rf power measurement | |
| CN200996875Y (en) | Multi-channel temperature-measuring recorder | |
| CN204188309U (en) | A kind of accurate thermopair reference edge samming compensating module | |
| CN107063493B (en) | Dual-purpose temperature-measuring and heating sensor | |
| CN206740263U (en) | A kind of thermocouple temperature measuring apparatus | |
| CN105571747A (en) | Heat flow detection device | |
| CN108534906A (en) | A kind of multiple spot temperature and humidity test instrument and its application method | |
| CN201047779Y (en) | Electric thermo-couple with temperature correction and monitoring hole | |
| CN208765869U (en) | High precision measuring temperature probe and high precision measuring temperature instrument | |
| CN204128708U (en) | A kind of mariages of response fast Thermistor Temperature Measurement device | |
| CN113310588A (en) | Remote temperature detection device based on mercury thermometer | |
| CN209541790U (en) | A kind of pipeline thread installing type Temperature Humidity Sensor | |
| CN202836813U (en) | Armored thermal resistor | |
| CN105784166A (en) | Temperature tester based on thermocouple | |
| Chen et al. | A Calibration Method for Thermocouple-temperature Calibrator Based on Cold Junction Compensation | |
| CN204831604U (en) | RC charge -discharge temperature measurement system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |