CN203657927U - Precise adjustable thermocouple cold end temperature compensation instrument - Google Patents
Precise adjustable thermocouple cold end temperature compensation instrument Download PDFInfo
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- CN203657927U CN203657927U CN201320891396.4U CN201320891396U CN203657927U CN 203657927 U CN203657927 U CN 203657927U CN 201320891396 U CN201320891396 U CN 201320891396U CN 203657927 U CN203657927 U CN 203657927U
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- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a precise adjustable thermocouple cold end temperature compensation instrument. The precise adjustable thermocouple cold end temperature compensation instrument comprises a voltage stabilizer power circuit, an adjustable cold end compensation circuit and a signal amplification processing module, wherein the voltage stabilizer power circuit is respectively connected with the adjustable cold end compensation circuit and the signal amplification processing module for providing positive and negative stable power for the whole instrument, an output end of the adjustable cold end compensation circuit is connected in series with thermocouples for outputting multiple paths of voltage signals suitable for cold end compensation of different types of thermocouples, and the signal amplification processing module is respectively connected with a measuring instrument and the output end of the adjustable cold end compensation circuit for superposing the cold end compensation signals with voltage signals generated by the thermocouples and outputting the compensated thermocouple signals after filtering and amplification. The precise adjustable thermocouple cold end temperature compensation instrument is advantaged in that compensation precision is high, environmental influence is small, and a problem of non-easy measurement because of the weak signals is solved, and the precise adjustable thermocouple cold end temperature compensation instrument can realize precise cold end compensation for various types of thermocouples.
Description
Technical field
The utility model relates to the cold junction compensation temperature measurement technology of thermopair, relate to specifically one be applicable to under low temperature condition and microminiature thermocouple output signal faint, be difficult to the adjustable thermocouple cold junction compensation instrument of precision that the occasion such as measurement is used.
Background technology
Thermocouple temperature sensor is in current contact temperature-measuring, to apply maximum thermoelectric transducers, have simple in structure, easy to make, the advantage such as temperature-measuring range is wide, thermal inertia is little.
The ultimate principle of thermocouple temperature measurement is that material conductor A, the B of two kinds of different components forms closed-loop path.In the time there is thermograde in two ends, in loop, just have electric current and pass through, now between two ends, will produce electromotive force---thermopower, there is Seebeck effect (Seebeck effect).One end that temperature is higher is working end (hot junction), one end that temperature is lower is reference edge (cold junction), standard couple reference edge is conventionally under certain stationary temperature, should be 0 ℃, but due to 0 ℃ of very difficult realization and control, therefore, when thermocouple measuring temperature, require the temperature of its cold junction to remain unchanged, its thermoelectrical potential size just with measure temperature and be certain proportionate relationship.If while measurement, the temperature of cold junction, with variation of ambient temperature, will have a strong impact on the accuracy of measurement.Therefore,, when application thermocouple measuring temperature, must carry out cold junction compensation to it.
Industrial widely used Method of Thermocouple Cold Junction Compensation has compensator bridge method, freezing point channel process and instrument calibration balance method at present.
As shown in Figure 5, compensator bridge method is that the output terminal of electric bridge is connected with thermopair, and the cold junction of thermopair and electric bridge are placed in to same temperature field.When design electric bridge, generally selecting 20 ℃ is bridge balance temperature, and now a, 2 current potentials of c equate, bridge output voltage is zero.In the time that temperature is not equal to 20 ℃, thermopair is because cold junction temperature changes the output potential amount of the changing △ E that makes thermopair, now due to R
h(R
htemperature-coefficient of electrical resistance larger, all the other arm resistances are coiled into by the very little manganese-copper filament of temperature-coefficient of electrical resistance, can think that its resistance does not vary with temperature) change in resistance, do not make a, c point-to-point transmission current potential not etc., electric potential difference is non-vanishing, automatically provides a compensating potential △ E`.Due to △ E and △ E` equal and opposite in direction, opposite direction, so just reaches the object of auto-compensation.But in this method, the compensator of different model often only carries out cold junction compensation and signal condition for the specific thermopair of one, can not carry out cold junction compensation for polytype thermopair, and temperature compensation range is limited, can only use within the limits prescribed, be generally 0～40 ℃, compensation precision is low, is subject to such environmental effects large.
Freezing point channel process is that the reference edge of thermopair is placed in mixture of ice and water container.But this way only limits to use in scientific experiment.Cause and tie point must be placed in two tie point short circuits respectively in two glass test tubees for fear of frozen water conduction, immerse same ice bath, make mutually insulated.
Instrument calibration balance method is the cold junction temperature when thermopair when comparatively constant, can before thermometric, disconnect test circuit, and the mechanical zero of Displaying Meter is adjusted in cold junction temperature, and this is equivalent to thermoelectrical potential modified value to be pre-applied on Displaying Meter.In the time connecting metering circuit, the indicated value of Displaying Meter is actual dut temperature.This method is simple, in industrial frequent use.If the room temperature of pulpit often changes, can produce larger measuring error, meter setting difficulty.
Summary of the invention
In view of the defect of prior art existence, the purpose of this utility model is to provide a kind of compensation precision high, be subject to such environmental effects little, overcome feeble signal and be difficult for the shortcomings such as measurement, realized the adjustable thermocouple cold junction compensation instrument of precision that can carry out to polytype thermopair accurate cold junction compensation.
To achieve these goals, the technical solution of the utility model:
A kind of accurate adjustable thermocouple cold junction compensation instrument, is characterized in that: comprise that voltage-stabilized power supply circuit, adjustable cold junction compensation circuit and signal amplify processing module; Described voltage-stabilized power supply circuit amplifies processing module with adjustable cold junction compensation circuit and signal respectively and is connected, and is used to whole instrument that stable positive-negative power is provided; The output terminal of described adjustable cold junction compensation circuit is connected with thermopair, is applicable to the voltage signal of different model cold junction compensation for exporting some roads; Described signal amplifies processing module and is connected with the output terminal of measurement instrument, adjustable cold junction compensation module respectively, for cold junction compensation voltage signal and thermopair are produced to voltage signal stack, and after filtering, amplifying, the thermocouple signal after output compensation.
Described voltage-stabilized power supply circuit comprises AC transformer T1, bridge rectifier circuit, and filtering circuit, voltage stabilizing integration module IC1, IC2 and remove ripple electric capacity, described AC transformer T1 is used for 220V alternating current to be converted into bridge rectifier required voltage; Described bridge rectifier circuit is for being converted into DC voltage by the alternating voltage of AC transformer T1 output; Described voltage stabilizing integration module provides stabilized voltage supply for other modules in instrument, and the described undesired signal of ripple electric capacity for filtering voltage stabilizing integration module out-put supply of going improves the output accuracy of power supply.
Described voltage-stabilized power supply circuit connecting luminous diode, is used to indicate power module of voltage regulation duty.
Described adjustable cold junction compensation circuit comprises precise integrated temperature sensor and connected accurate divider resistance, described precise integrated temperature sensor is used for measuring thermocouple cold junction, and exports corresponding voltage signal after the cold junction temperature signal of detection is converted to analog voltage signal; Described accurate divider resistance, for the voltage signal of precise integrated temperature sensor output is carried out to dividing potential drop, produces and is applicable to the required compensating signal of dissimilar thermopair.
Described adjustable cold junction compensation circuit also comprises the many gears rotary switch S1 being connected with accurate divider resistance, described many gears rotary switch S1, for controlling the bucking voltage of the dissimilar thermopair of selecting output access instrument, just can realize by switch transition the object that compensates respectively dissimilar thermopair.
Described signal amplifies processing module and comprises adjustable operational amplification circuit, front-end processing circuit and output processing circuit, and described adjustable operational amplification circuit is by amplifier A2, and several resistance and many gears rotary switch S2 form; Described front-end processing circuit and output processing circuit, for signal is carried out to filtering processing, are removed signal noise.
Described amplifier A2 adopts and inputs in the same way and adopt negative feedback type to set amplifier magnification ratio.
The backfeed loop of described amplifier A2 is made up of precision resistance R8, R9, R10, R11, R12 and many gears rotary switch S2, by switch knob switch S 2 gears, by different resistance access amplifying circuits, realizes the output of different gain amplifiers.
Compared with prior art, the utlity model has following beneficial effect:
1, the utility model adopts advanced precise integrated temperature sensor, can under-55 ℃～+ 150 ℃ environment, carry out cold junction compensation to thermopair.Adopt precision resistance, operational amplifier; Guaranteed that dynamic response time is short, compensation precision is high, can carry out the advantages such as continuous coverage; Adopt positive-negative power is sensor and peripheral circuit power supply simultaneously, can, for thermopair compensation negative voltage, can below zero degrees celsius, in environment, normally work.
2, the utility model has multiple compensation model, can carry out cold junction compensation to polytype thermopairs such as E, J, K, R, S, T.
3, the utility model has designed the amplification gear of multiple gears, measures for different accuracy level measurement terminal.Can effectively reduce measuring error.
4, the utility model adopts standard signal output, can directly carry out data acquisition and processing (DAP) by computing machine.
Accompanying drawing explanation
Fig. 1 the utility model cold junction compensation instrument theory diagram;
Fig. 2 the utility model voltage-stabilized power supply circuit schematic diagram;
The adjustable cold junction compensation circuit schematic diagram of Fig. 3 the utility model;
Fig. 4 the utility model is adjustable operational amplification circuit schematic diagram;
Fig. 5 compensator bridge method circuit theory diagrams.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is further elaborated.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is further elaborated.
As shown in Figure 1, the utility model mainly comprises that DC-stabilized circuit, adjustable cold junction compensation circuit and signal amplify processing module; Thermocouple signal is connected with cold junction compensation circuit output terminal after front-end processing circuit is processed signal filtering, and output voltage signal after signal amplification and filtering connects measurement instrument and measures.
Fig. 2 is voltage-stabilized power supply circuit schematic diagram of the present utility model, the AC transformer T1 that voltage-stabilized power supply circuit is mainly inputted by 220V as seen from the figure, and bridge rectifier circuit, filtering circuit, voltage stabilizing integration module IC1, IC2, go the formations such as ripple electric capacity.Wherein, AC transformer T1 is used for 220V alternating current to be converted into bridge rectifier required voltage; Alternating voltage is converted into DC voltage by bridge rectifier circuit; Can export ± 15V of voltage stabilizing integration module voltage, is used to other modules that high-precision power is provided.
Wherein can be by access light emitting diode, indication voltage-stabilized power supply circuit duty.
Fig. 3 is adjustable cold junction compensation circuit schematic diagram of the present utility model.Adjustable cold junction compensation circuit is mainly made up of precise integrated temperature sensor U4 and precision resistance as seen from the figure.Wherein precision temperature sensor U4 employing model is LM35 precision temperature sensor, be mainly used in measuring cold junction temperature, and cold junction temperature signal is converted to analog voltage signal exports, under general normal operation, crus secunda output voltage signal is 10mV/ ℃.As shown in Figure 3, the 1st pin of precise integrated temperature sensor U4 connects positive source, tripod ground connection, and resistance R is passed through in crus secunda output
41connect negative supply.Wherein R
41computing method are as follows:
R
41=15V/5ouA=30okΩ
In the time that the operating voltage of precise integrated temperature sensor U4 is within the scope of 4～30V, the electric current that this chip absorbs from power supply is almost constant, approximately 50 μ A.Its second pin output computing formula:
V
out(T)=10mV/℃×T℃
Therefore,, in the time that cold junction temperature is-55 ℃, crus secunda output voltage is-550mV; In the time that cold junction temperature is 0 ℃, crus secunda output voltage is 0V; In the time that cold junction temperature is 150 ℃, crus secunda output voltage is 1500mV.
Its output voltage signal is by precision resistance R20, R22, R24, R26, R28, R30 and R40 dividing potential drop, and then six kinds of required compensating signals of different thermopairs of generation; By six kinds of thermopair bucking voltages of six gear rotary switch control access instruments, reach the adjustable object of compensation type; Just can compensate respectively E, J, K, R, S, six types of thermopairs of T by switch transition.
Fig. 4 is adjustable operational amplification circuit schematic diagram of the present utility model.Adjustable operational amplification circuit is by amplifier A2, several resistance and many gears rotary switch S2 composition; For cold junction compensation signal and thermopair are produced to voltage signal stack, after filtering, amplifier A2 amplify, the thermocouple signal after output compensation; As Fig. 4, amplifier A2 and precision resistance R8, R9, R10, R11, R12 form amplifying circuit by rotary switch, by switch knob switch, by different resistance access amplifying circuits, realize different gains output, be illustrated in figure 4 Pyatyi (1,10,100,500,1000 times) gain output.
Described amplifier A2 adopts and inputs in the same way and adopt negative feedback type to set amplifier magnification ratio.
The backfeed loop of described amplifier A2 is made up of precision resistance R8, R9, R10, R11, R12 and many gears rotary switch S2, by switch knob switch S 2 gears, by different resistance access amplifying circuits, realizes the output of different gain amplifiers.
Its gain amplifier computing formula is as follows,
Wherein R is the precision resistance in access amplifying circuit.
Described signal amplifies filter capacitor C12 in processing module and carrys out the interference of filtering input signal.
The above; it is only preferably embodiment of the utility model; but protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; be equal to replacement or changed according to the technical solution of the utility model and utility model design thereof, within all should being encompassed in protection domain of the present utility model.
Claims (8)
1. the adjustable thermocouple cold junction compensation instrument of precision, is characterized in that: comprise that voltage-stabilized power supply circuit, adjustable cold junction compensation circuit and signal amplify processing module; Described voltage-stabilized power supply circuit amplifies processing module with adjustable cold junction compensation circuit and signal respectively and is connected, and is used to whole instrument that stable positive-negative power is provided; The output terminal of described adjustable cold junction compensation circuit is connected with thermopair, is applicable to the voltage signal of different model cold junction compensation for exporting some roads; Described signal amplifies processing module and is connected with the output terminal of measurement instrument, adjustable cold junction compensation module respectively, for cold junction compensation voltage signal and thermopair are produced to voltage signal stack, and after filtering, amplifying, the thermocouple signal after output compensation.
2. the adjustable thermocouple cold junction compensation instrument of precision according to claim 1, it is characterized in that: described voltage-stabilized power supply circuit comprises AC transformer T1, bridge rectifier circuit, filtering circuit, voltage stabilizing integration module IC1, IC2 and remove ripple electric capacity, described AC transformer T1 is used for 220V alternating current to be converted into bridge rectifier required voltage; Described bridge rectifier circuit is for being converted into DC voltage by the alternating voltage of AC transformer T1 output; Described voltage stabilizing integration module is used to other modules in instrument that stabilized voltage supply is provided, and the described undesired signal of ripple electric capacity for filtering voltage stabilizing integration module out-put supply of going improves the output accuracy of power supply.
3. the adjustable thermocouple cold junction compensation instrument of precision according to claim 2, is characterized in that: described voltage-stabilized power supply circuit connecting luminous diode, is used to indicate power module of voltage regulation duty.
4. the adjustable thermocouple cold junction compensation instrument of precision according to claim 1, it is characterized in that: described adjustable cold junction compensation circuit comprises precise integrated temperature sensor and connected accurate divider resistance, described precise integrated temperature sensor is used for measuring thermocouple cold junction, and exports corresponding voltage signal after the cold junction temperature signal of detection is converted to analog voltage signal; Described accurate divider resistance, for the voltage signal of precise integrated temperature sensor output is carried out to dividing potential drop, produces and is applicable to the required compensating signal of dissimilar thermopair.
5. the adjustable thermocouple cold junction compensation instrument of precision according to claim 4, it is characterized in that: described adjustable cold junction compensation circuit also comprises the many gears rotary switch S1 being connected with accurate divider resistance, described many gears rotary switch S1, for controlling the bucking voltage of the dissimilar thermopair of selecting output access instrument, just can compensate respectively dissimilar thermopair by switch transition.
6. the adjustable thermocouple cold junction compensation instrument of precision according to claim 1, it is characterized in that: described signal amplifies processing module and comprises adjustable operational amplification circuit, front-end processing circuit and output processing circuit, described adjustable operational amplification circuit is by amplifier A2, and several resistance and many gears rotary switch S2 form; Described front-end processing circuit and output processing circuit, for signal is carried out to filtering processing, are removed signal noise.
7. the adjustable thermocouple cold junction compensation instrument of precision according to claim 6, is characterized in that: described amplifier A2 adopts and inputs in the same way and adopt negative feedback type to set amplifier A2 enlargement factor.
8. the adjustable thermocouple cold junction compensation instrument of precision according to claim 7, it is characterized in that: the backfeed loop of described amplifier A2 is made up of precision resistance R8, R9, R10, R11, R12 and many gears rotary switch S2, by switch knob switch S 2 gears, by different resistance access amplifying circuits, realize the output of different gain amplifiers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320891396.4U CN203657927U (en) | 2013-12-31 | 2013-12-31 | Precise adjustable thermocouple cold end temperature compensation instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320891396.4U CN203657927U (en) | 2013-12-31 | 2013-12-31 | Precise adjustable thermocouple cold end temperature compensation instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674308A (en) * | 2013-12-31 | 2014-03-26 | 大连交通大学 | Precise and adjustable cold junction temperature compensation instrument for thermocouples |
| CN108474693A (en) * | 2016-01-18 | 2018-08-31 | 三菱电机株式会社 | Measurement device and assay method |
-
2013
- 2013-12-31 CN CN201320891396.4U patent/CN203657927U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674308A (en) * | 2013-12-31 | 2014-03-26 | 大连交通大学 | Precise and adjustable cold junction temperature compensation instrument for thermocouples |
| CN103674308B (en) * | 2013-12-31 | 2016-08-17 | 大连交通大学 | Accurate adjustable thermocouple cold junction compensation instrument |
| CN108474693A (en) * | 2016-01-18 | 2018-08-31 | 三菱电机株式会社 | Measurement device and assay method |
| CN108474693B (en) * | 2016-01-18 | 2020-05-01 | 三菱电机株式会社 | Measuring apparatus and measuring method |
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