CN1004443B - Portable numerical universal thermometer - Google Patents
Portable numerical universal thermometer Download PDFInfo
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- CN1004443B CN1004443B CN87100716.9A CN87100716A CN1004443B CN 1004443 B CN1004443 B CN 1004443B CN 87100716 A CN87100716 A CN 87100716A CN 1004443 B CN1004443 B CN 1004443B
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- gating
- present
- resistance
- cutter
- temperature
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Abstract
The present invention belongs to a thermal thermometric instrument, more specifically a portable digital universal thermometric instrument which has the advantages of small size, light weight, more functions and high precision. The present invention is proposed to overcome the problem that the ordinary portable thermometric instrument can only match with a thermocouple or a thermal resistor, and thus, the ordinary portable thermometric instrument has the defects of few functions and inconvenient use. The present invention can match with a plurality of thermocouples and thermal resistors through the gating of a gating switch so as to measure temperature; the present invention can measure weak voltage, current and resistance and can measure environment temperature; the present invention has the function of thermocouple cold junction compensation. Besides, the present invention is provided with a potentiometer for regulating and calibrating thermal resistors and conducting wire resistors, and thus, the precision of temperature measurement can be raised; the present invention also has the function of digital display latch. Proved by practice, the present invention has favorable effect and is favored by users.
Description
The invention belongs to thermal technology's temperature instrumentation.
Existing multiple with the digital temperature measuring instrument table of thermopair and thermal resistance adapted in the thermal technology field, wherein major part is the subrack formula.It is convenient to be fixedly mounted on the instrument cabinet.The test point dispersion is only needed sampling observation or provisional detection and needs to use under the mobile situation then very inconvenient.The instrument worker uses the big and heavy potential difference meter of volume to on-the-spot calibration more in addition, and reading also need could use through conversion.Know by retrieval that at present existing 1. handled digital thermometer table is as joining-5 °～100 ℃ for G of copper resistance calibration number; 2. join the thermopair calibration and number be 0～1300 ℃ the handled digital thermometer of K, they can only join a kind of thermoelectricity occasionally thermal resistance use, can not satisfy thermopair.The needs at the scene that thermal resistance is various in style.Day is put the instructions of the product " HIOKI digital display thermometer 3412 " of motor government share company limited by Japan.It is very big-50～999 ℃ just to have disclosed a kind of range.But can only with the matched fact of thermopair of a kind of K type chromium nickel-aluminium nickel.
Purpose of the present invention provides a kind of portable, multi-functional temperature instrumentation for giving instrument worker, operative employee and scientific and technical personnel.Be convenient to spot sampling check, thermometric calibration etc.Special adaptation thermopair, miscellaneous on-the-spot use of thermal resistance.The design has adopted the multitool multithrow switch, the different resistance of arranging in pairs or groups.Adopt the method for 7650 linear operational amplifier simulation trials, line taking recurrence to approach the voltage temperature curve of thermopair and the resistance temperature curve of thermal resistance, obtain higher measuring accuracy, adaptability more widely with the segmentation straight line.
By the omnipotent digital temperature measurer of hand-held that as above thinking provided is by digital gauge outfit operational amplifier, and gating switch and power supply unit branch are formed.It is characterized in that this multi-functional temperature instrumentation can be fit to multiple hot thermocouple resistance etc. and only adopt the two-wire system input.Its operational amplifier adopts the linear operational amplifier of the low drift of 7650 integrated circuit.The gating switch that in the selection of input and display packing, adopts coaxial five cuttves (or six cuttves) to throw more.The gating switch that this multitool is thrown more is by making multiplication and division shelves gating cutter D with the different resistance of series connection between each throwing point to change signal amplification factor
1 , comprise thermopair, voltage, electric current as signal type, measuring resistance and thermal resistance, survey environment temperature gating cutter D
2, make to add downshift gating (can use two cuttves when needing) cutter D with the method that changes the input signal current potential
3Make to adapt to different The Cold-Junction Compensation for Thermocouple gating cutter D with changing compensating proportion
4, make radix point gating cutter D with the method that changes the display end current potential
5Formed.It has also disposed to the temperature sensitive resister of surveying environment and the adjusting calibration potentiometer of conductor resistance during for calorimetric resistance.
The present invention adopts the method for linear regression, and the simulation trial through 7650 approaches voltage temperature (E-T) curve of thermopair and resistance temperature (R-T) curve of thermal resistance with the segmentation straight line.Obtain the demonstration of degree of precision.For example:
Calibration range analog computation expression formula
30 °～260 ℃ T=7.0+13.07E of thermopair EA-2
260°～800℃ T＝35+11.54E
EU-2 0°～1000℃ T＝1.8+24.1E
1000°～1300℃ T＝-9.5+26.57E
0 °～300 ℃ T=-264+34.55E(Ω of thermal resistance BA)
300°～650℃ T-330+38.5E（Ω）
T is a temperature ℃ in the formula; E is thermocouple electromotive force mV; E(Ω) the electromotive force mV that on divider resistance, produces of thermal resistance resistance.
This programme can possess following function: 1. can be used with various thermopair and thermal resistance.As with the thermopair of T, the J of the international electrical standard of IEC, E, K, S, B, R equal indicative number, the electroheat pair and the BA of the EA-2 of international practical temperature scale, EU-2, LB-3, LL-2, TK equal indicative number
1, BA
2, G equal indicative number thermal resistance be used; 2. the numerical value of faint voltage (mV), electric current (mA) and the resistance (m Ω) of energy measurement; 3. this table is provided with the R8 temperature sensitive resister can shows indoor environment temperature during not external receptor on neutral gear; 4. the design has the galvanic couple cold junction compensation of different compensating proportions with the thermopair adapted time, to enlarge the adaptation of variety classes galvanic couple and to improve measuring accuracy; 5. be provided with to improving the adjusting calibration potentiometer of the thermal resistance conductor resistance of measuring the thermal resistance precision.6. the function that has digital display latch.This programme measuring accuracy is not less than 0.5 grade.If revise by given data.Absolute error is not more than 1 ℃.
Adopt this programme can embody following superiority: 1. multi-functional: as described above it can with the thermopair of 12 kinds of standards, the thermal resistance adapted of 3 kinds of standards.Can also test faint voltage, electric current, resistance: can also be used with various transmitters, need not external sensor instrument self can also show room temperature; 2. precision height: the display precision of this instrument is not less than 0.5 grade, if revised by given numerical value.Absolute error only has 1 ℃; 3. easy to use.This instrument has the inner cold junction compensation of thermopair, during with the thermocouple thermometric.Can compensate automatically because room temperature changes the error that causes, need not outer distribution resistance during with the thermal resistance thermometric.Signal input part has only two terminals, and wiring is simple.Its volume is little, in light weight easy to carry; 4. with low cost.This instrument is only carried out simulation trial with an integrated circuit, realizes multifunctional measuring with the method that changes peripheral circuit.Cost only omits height a bit than single temperature measurer instrument.
Description of drawings:
Fig. 1 is the electrical schematic diagram of handheld digital all purpose instruments.This figure is the instrument that five cuttves are thrown gating switch more.D
1It is multiplication and division shelves gating cutter.D
2It is signal type gating cutter.D
3Be to add downshift gating cutter.D
4It is cold junction compensation gating cutter.D
5It is radix point gating cutter.R
6It is temperature sensitive resister.R
3It is the adjusting calibration potentiometer of thermal resistance conductor resistance.
Embodiment: this embodiment adopts 7650 simulation trials, does the A/D conversion with integrated circuit 7106, and carries out the demonstration of 31/2 bit digital by liquid crystal, and switch is selected 6 cuttves, 30 throw switches for use.Its each grade resistance value tabulate in after.
Fig. 2 is the contour structures synoptic diagram of this instrument.Wherein: (1)-liquid crystal dial plate; (2)-multitool throws the dial plate of gating switch and gating class more; (3)-connection terminal.
R1.1＝10.04K R2.1＝1.448K
R1.2＝4.39K R2.2＝3.882
R1.3＝2.33K R2.3＝2.405
R1.4＝2.158K R2.4＝2.689
R1.5＝1.082K R2.5＝3.161
R1.6＝243Ω
R1.7＝2.389K R3.1＝1.215K
R1.8＝908Ω R3.2＝1.679K
R1.9＝21.392K R3.3＝97Ω
R1.10＝6.95K R3.4＝174Ω
R1.11＝66Ω R3.5＝994Ω
R1.12＝5.95K R3.6＝583Ω
R1.13＝312Ω R3.7＝146Ω
R1.14＝17.07K R3.8＝12Ω
R1.15＝7.72K R3.9＝46Ω
R1.16＝26.87K R3.10＝128Ω
R1.17＝13.37K R3.11＝111Ω
R1.18＝29.79K R3.12＝1.381K
R1.19＝20.29K R1.13＝23Ω
R1.20＝26.69K
R1.21＝1.8M R4.1＝381.9K
R1.22＝18M R4.2＝39.14K
R4.3＝51.24K
R4.4＝8.36K
R4.5＝64.05K
R4.6＝50K
R4.7＝123.08Ω
R4.8＝117.62Ω
R5.1＝480Ω
R5.2＝29.52K
R5.3＝19.8K
R5.4＝200Ω
R5.5＝15.2K
Temperature sensitive resister R8=10 Ω
The adjusting calibration of conductor resistance
The position device is 40K
This off-balancesheet shape overall dimension is
170×90×50mm
R6.1＝1Ω
R6.2＝4Ω
Claims (1)
1, the digital temperature measurer of the tens thousand of energy of a kind of hand-held is made up of digital watch, operational amplifier, gating circuit switch and power unit, it is characterized in that two-wire system is adopted in its signal input.Its operational amplifier is the low drift linear operational amplifier that adopts 7650 integrated circuit, and the selection of input and display packing is the gating switch that adopts coaxial five cuttves (or six cuttves) to throw more.The gating switch that this multitool is thrown more is by making multiplication and division shelves gating cutter D with increasing resistance in series to change signal amplification factor
1Comprise thermopair and voltage, electric current, resistance and thermal resistance, survey environment temperature gating cutter D as signal type
2, make to add downshift gating (when needing can with two cuttves) cutter D with the method that changes the input signal current potential
3, make to adapt to different The Cold-Junction Compensation for Thermocouple gating cutter D with changing compensating proportion
4Make radix point gating cutter D with the method that changes the display end current potential
*Formed, it has also disposed to the temperature sensitive resister of surveying environment temperature and the adjusting calibration potentiometer of conductor resistance during for calorimetric resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87100716.9A CN1004443B (en) | 1987-02-21 | 1987-02-21 | Portable numerical universal thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87100716.9A CN1004443B (en) | 1987-02-21 | 1987-02-21 | Portable numerical universal thermometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87100716A CN87100716A (en) | 1987-08-12 |
| CN1004443B true CN1004443B (en) | 1989-06-07 |
Family
ID=4812993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87100716.9A Expired CN1004443B (en) | 1987-02-21 | 1987-02-21 | Portable numerical universal thermometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004443B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084297C (en) * | 1996-11-22 | 2002-05-08 | 湖南安淳节能技术有限公司 | Flow dividing process for ammonia or alcohol synthesis reaction system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776553B (en) * | 2014-02-17 | 2016-06-15 | 国家电网公司 | Transformator or reactor oil temperature detect and analog |
| CN115452179B (en) * | 2022-11-07 | 2023-02-14 | 四川天利科技有限责任公司 | Multi-channel real-time self-calibration thermocouple cold end temperature measurement method |
-
1987
- 1987-02-21 CN CN87100716.9A patent/CN1004443B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084297C (en) * | 1996-11-22 | 2002-05-08 | 湖南安淳节能技术有限公司 | Flow dividing process for ammonia or alcohol synthesis reaction system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN87100716A (en) | 1987-08-12 |
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