CN204422104U - A kind of furnace temperature instrument compensated with oxygen determination - Google Patents
A kind of furnace temperature instrument compensated with oxygen determination Download PDFInfo
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- CN204422104U CN204422104U CN201520015735.1U CN201520015735U CN204422104U CN 204422104 U CN204422104 U CN 204422104U CN 201520015735 U CN201520015735 U CN 201520015735U CN 204422104 U CN204422104 U CN 204422104U
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Abstract
The utility model discloses a kind of furnace temperature instrument compensated with oxygen determination, also comprise oxygen determination module, it comprises zirconium oxide oxygen sensor, and zirconium oxide oxygen sensor comprises positive oxygen gesture signal pin, negative oxygen gesture signal pin, the positive complexing pin being connected to positive source and the negative complexing pin held with being connected to; Signal amplification circuit, its output terminal and negative complexing pin couple, and its reference edge and ground are coupled with one the 3rd resistance between holding; If ambient temperature fluctuations comparatively large (as measured combustion gas) or gas flow rate higher, the temperature of sensor just must keep constant in the degree of accuracy improving measurement.Can be changed according to the change of its environment temperature by its output voltage of low-dropout regulator, thus the heating voltage of adjustment sensor, can not affect by the temperature of surrounding to ensure sensor temperature to keep constant, by amplifying circuit to export measure analog signals accurately, substantially increase the precision of measurement.
Description
Technical field
The utility model relates to a kind of temperature measurement tool, and more particularly, it relates to a kind of furnace temperature instrument compensated with oxygen determination.
Background technology
electronics,
spraying,
glass,
iron and steel,
sun power sintering furnace,
automobilecar load sprays
be coated with, aluminium, in the technique such as Dacroment, the curvilinear motion of in-furnace temperature is related to the quality effect of product after its processing, thermometric mode be in the past use also longer than stove
thermopairline does measuring temp function (being called that kiteflying formula or fishing type measure), and not only troublesome poeration, cost is also higher simultaneously.In view of this,
furnace temperature trackerto enter thermometric mode in stove with measuring thing, accurate fast fetching obtains and record monitoring in-furnace temperature and changes situation, user can nationality by each silicon carbide in metric data, adjustment, monitoring stove, and then reach the Optimal Control of furnace environment.
At present, furnace temperature instrument more common on market, generally comprise the thermopair that a group 8 or a group 16 are arranged at different test point in stove, the simulating signal fed back is converted into digital signal by a signal acquisition module, then be input in signal processing chip and carry out signal transacting, and then export in display module, such user just can recognize the temperature parameter of each test point in stove very intuitively, then carries out respective operations.
Application number is that the utility model patent of 20112046039.X discloses a kind of furnace temperature online testing device, it comprises the one group of thermopair being arranged on each test point in stove, then by thermopair linking number weighted-voltage D/A converter, the simulating signal of collection is changed into digital signal and outputs to transmitter module, then received by receiver module and launch this signal in single-chip microcomputer, this single-chip microcomputer can be STM8S105K4 or STM32F103R8 etc., realizes the functions such as data display.
But, along with the development of measurement of furnace temperature technology, often need the parameter support that important, it is exactly oxygen concentration in stove, but in the past due to two technical barriers: 1, oxygen sensor can not support that high-temperature oxygen detects, so be all adopt hand-held oxygen sensor, carry out output collection, temperature information in conjunction with the collection of furnace temperature instrument artificially calculates, such intricate operation, greatly waste cost and also can produce larger error, but along with the development of China's high temperature detection technique, zirconium oxide oxygen sensor can be widely used in oil exploitation, petrochemical complex, pipeline oil transportation, metal smelt, thermal power generation, pottery, the various boilers such as the industry-by-industries such as cement and city central heating, in furnace equipment, so need can furnace temperature instrument directly with oxygen detection.
Although, application number is 03259622.7 disclose a kind of applicable oxygen analyser with high-temperature condition, it is by four terminals, comprise two power ends and two signal ends, one due to this oxygen sensors volume excessive, can not be integrated in furnace temperature instrument and use, two carry out this sensor still exists the drift of larger temperature, if ambient temperature fluctuations comparatively large (as measured combustion gas) or gas flow rate higher, the temperature of sensor, under continuous heating condition, just easily causes measuring accuracy poor.
Utility model content
For the deficiency that precision is lower when wrinkle temperature fluctuation is larger that prior art exists, the purpose of this utility model is to provide a kind of sampling with high precision furnace temperature instrument.
For achieving the above object, the utility model provides following technical scheme: a kind of furnace temperature instrument compensated with oxygen determination, comprise temperature collect module, analog-to-digital conversion module and single-chip microcomputer, also comprise oxygen determination module, it comprises zirconium oxide oxygen sensor, and described zirconium oxide oxygen sensor comprises positive oxygen gesture signal pin, negative oxygen gesture signal pin, the positive complexing pin being connected to positive source and the negative complexing pin held with being connected to; Signal amplification circuit, is connected to negative oxygen gesture signal pin and positive oxygen gesture signal pin; Low-dropout regulator, is also connected to the first polar capacitor between its input end and described positive complexing pin, and its output terminal and negative complexing pin couple, and its reference edge and ground are coupled with one the 3rd resistance between holding; The first partial pressure unit of the first resistance and the second resistance composition is also in series with between described positive complexing pin and negative complexing pin; The feedback end of described low-dropout regulator is connected to the node that the first resistance and the second resistance couple formation.
The utility model can be set to further: be also connected to the second polar capacitor between described positive complexing pin and ground end.
The utility model can be set to further: be also connected to the 3rd polar capacitor between described positive complexing pin and negative complexing pin.
Preferably, described low-dropout regulator model elects LT1185 as.
The utility model can be set to further: described signal amplification circuit comprises the first amplifier, and positive input terminal and output terminal couple and be connected to positive oxygen gesture signal pin; Successively series electrical source and ground hold between the second partial pressure unit of forming of the 4th resistance, the 5th resistance and the 6th resistance, the negative input end of described first amplifier is connected to the node between the 5th resistance and the 6th resistance; Second amplifier, its positive input terminal ground connection, its negative input end is connected to negative oxygen gesture signal pin, is also coupled with the 7th resistance between its input end and negative input end; 3rd amplifier, its positive input terminal ground connection, is coupled with the 8th resistance between the output terminal of its negative input end and the second amplifier, be coupled with the 9th resistance between its output terminal and negative input end.
The utility model can be set to further: described 9th resistance is adjustable resistance.
The utility model can be set to further: the node between described 4th resistance and the 5th resistance and ground are also connected to voltage stabilizing diode between holding, and the anode of described voltage stabilizing diode is held with being connected to.
The utility model can be set to further: the node between described 4th resistance and the 5th resistance and ground are also connected to the 4th electric capacity between holding.
Preferably, described first amplifier and the 3rd Amplifier Model elect 0P07 as.
Compared to existing technology, the utility model creates following beneficial effect: if ambient temperature fluctuations comparatively large (as measured combustion gas) or gas flow rate higher, the temperature of sensor just must keep constant in the degree of accuracy improving measurement.Can be changed according to the change of its environment temperature by its output voltage of low-dropout regulator, thus the heating voltage of adjustment sensor, can not affect by the temperature of surrounding to ensure sensor temperature to keep constant, by amplifying circuit to export measure analog signals accurately, substantially increase the precision of measurement.
Accompanying drawing explanation
Fig. 1 is the utility model low-dropout regulator schematic diagram;
Fig. 2 is the schematic diagram of the utility model signal amplification circuit;
Fig. 3 is the utility model integrated circuit structural drawing;
Fig. 4 is the linear relationship chart of input voltage and output voltage under LT1185 different temperatures.
Description of reference numerals: 1, low-dropout regulator; 1.1, the first partial pressure unit; 2, zirconium oxide oxygen sensor; 3, signal amplification circuit; 3.1, the second partial pressure unit.
Embodiment
Be described in further details with reference to accompanying drawing 1 to 4 pair of the utility model embodiment.
A kind of furnace temperature instrument compensated with oxygen determination, comprise temperature collect module, analog-to-digital conversion module and single-chip microcomputer, also comprise oxygen determination module, it comprises zirconium oxide oxygen sensor 2, its model is preferably SO-B0-010, it can gather micro-oxygen content ppm unit in hot environment, convert simulating signal to, to signal amplification circuit, zirconium oxide oxygen sensor 2 comprises positive oxygen gesture signal pin Sense+, negative oxygen gesture signal pin Sense-, the positive complexing pin (HeaterSense+ and Heater+) being connected to positive source and the negative complexing pin (HeaterSense-and Heater-) held with being connected to, signal amplification circuit 3, is connected to negative oxygen gesture signal pin Sense-and positive oxygen gesture signal pin Sense+, low-dropout regulator 1, its model elects LT1185 as.The first polar capacitor C1 is also connected between its input end and positive complexing pin (HeaterSense+ and Heater+), its capacity is preferably 2.2uF, its output terminal and negative complexing pin (HeaterSense-and Heater-) couple, and its reference edge and ground are coupled with one the 3rd resistance R3 between holding; The first partial pressure unit 1.1 that the first resistance R1 and the second resistance R2 forms also is in series with between positive complexing pin (HeaterSense+ and Heater+) and negative complexing pin (HeaterSense-and Heater-); First resistance R1 resistance is preferably 3.9M ohm, and the second resistance R2 resistance is preferably 10 kilo-ohms, and the feedback end of low-dropout regulator 1 is connected to the node that the first resistance R1 and the second resistance R2 couples formation.First, as shown in Figure 1, LT1185 is the 3A low-dropout regulator 1 of a tool adjustable current limit value and far-end ability in sampling.This device can be used as the float positive output voltage stabilizer of input or the standard of tool ground connection input of a tool and bears voltage stabilizer.Output voltage range is 2.5V to 25V, and to have ± internal reference voltage the accuracy of 1%.LT1185 adopts a saturated restriction NPN transistor as transfer element.This device can provide the linear differential pressure characteristics of FET transfer element, and chip area significantly reduces, and can be integrated in furnace temperature instrument inner.By adopting special anti saturation circuit to maintain high-level efficiency, this circuit is responsible for regulating base drive to follow the tracks of load current." conducting resistance " of transmission transistor is generally 0.25 Ω.Current limit is arranged (its scope is 0A to 3A) by utilizing single 1/8W external resistor accurately.Second fixing internal limitations circuit for avoid when unexpected exceed program current scope exposed to damaging electric current.Can ensure the shutoff that voltage stabilizer exports when program current is less than 1 μ A, thus the external logic realizing output voltage controls.As shown in Figure 4, by the characteristic of LT1185 exportable different voltage at different temperatures, under normal circumstances, the multiplexing heating voltage of zirconium oxide oxygen sensor 2 is constant, but once external environment temperature changes, the resistance of its zirconium oxide oxygen sensor 2 will change, its heating voltage is caused to change, namely now be multiplexed with these two pins of Heater Sense+ and Heater Sense-for heating to sensor, by constantly regulating the equivalent resistance of well heater, with the first resistance R1 preset, second resistance R2, the resistance of the 3rd resistance R3, just can ensure zirconium oxide oxygen sensor 2 temperature remained constant, its value exported is more accurate.The second polar capacitor C2 is also connected between positive complexing pin (HeaterSense+ and Heater+) and ground end.Its capacity is preferably 470u.By arranging the second polar capacitor C2, the voltage jump between voltage and ground can be prevented, ensureing the stable of its operating voltage.The 3rd polar capacitor C3 is also connected between positive complexing pin (HeaterSense+ and Heater+) and negative complexing pin (HeaterSense-and Heater-), its capacity is preferably 2.2uF, to prevent the voltage jump between two complexing pins, reduce burr voltage to the impact of sensor.
With reference to shown in Fig. 2, amplifying circuit principle is as follows: comprise the first amplifier, and positive input terminal and output terminal couple and be connected to positive oxygen gesture signal pin Sense+; Successively series electrical source and ground hold between the second partial pressure unit 3.1 of forming of the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, regulate the resistance of three resistance that its input just can be regulated with reference to following voltage, here preferably the 4th resistance R4 resistance is 100 ohm, 5th resistance R5 and the 6th resistance R6 value are 10 kilohms, it is 2.4 volts with reference to following magnitude of voltage, and the negative input end of described first amplifier is connected to the node between the 5th resistance R5 and the 6th resistance R6; Second amplifier, its positive input terminal ground connection, its negative input end is connected to negative oxygen gesture signal pin Sense-, is also coupled with the 7th resistance R7 between its input end and negative input end; 3rd amplifier, its positive input terminal ground connection, is coupled with the 8th resistance R8 between the output terminal of its negative input end and the second amplifier, be coupled with the 9th resistance R9 between its output terminal and negative input end.Described 9th resistance R9 is adjustable resistance.Can by the resistance of adjustment the 9th resistance R9, preset the amplification coefficient of the utility model furnace temperature instrument, its simulating signal is made to be applicable to more analog-to-digital conversion chips, node between described 4th resistance R4 and the 5th resistance R5 and ground are also connected to voltage stabilizing diode D1 between holding, the anode of described voltage stabilizing diode D1 is held with being connected to, and voltage stabilizing diode D1 voltage stabilizing value is preferably 5.1 volts, can when overtension and the 4th electric capacity form loop, form bleed off voltage, ensure the trouble free service of amplifier.Node between described 4th resistance R4 and the 5th resistance R5 and ground are also connected to the 4th electric capacity between holding.Described first amplifier and the 3rd Amplifier Model elect 0P07 as, and Op07 chip is a kind of low noise, the bipolar operational amplifier integrated circuit of non-chopper-zero-stabilized.Because OP07 has low-down input offset voltage (being 25 μ V to the maximum for OP07A), so OP07 does not need extra zeroing measure in a lot of application scenario.OP07 has input bias current low (OP07A is ± 2nA) and the feature of open-loop gain high (be 300V/mV for OP07A) simultaneously, and the characteristic of this low imbalance, high open-loop gain makes OP07 be specially adapted to the aspect such as the measuring equipment of high-gain and the feeble signal of amplification sensor.Second Amplifier Model is preferably TL071, ensures that its larger impedance is to reduce signal disturbing when signal amplifies.
The above is only preferred implementation of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (9)
1., with the furnace temperature instrument that oxygen determination compensates, comprise temperature collect module, analog-to-digital conversion module and single-chip microcomputer, it is characterized in that: also comprise oxygen determination module, it comprises
Zirconium oxide oxygen sensor, described zirconium oxide oxygen sensor comprises positive oxygen gesture signal pin, negative oxygen gesture signal pin, the positive complexing pin being connected to positive source and the negative complexing pin held with being connected to;
Signal amplification circuit, is connected to negative oxygen gesture signal pin and positive oxygen gesture signal pin;
Low-dropout regulator, is also connected to the first polar capacitor between its input end and described positive complexing pin, and its output terminal and negative complexing pin couple, and its reference edge and ground are coupled with one the 3rd resistance between holding;
The first partial pressure unit of the first resistance and the second resistance composition is also in series with between described positive complexing pin and negative complexing pin; The feedback end of described low-dropout regulator is connected to the node that the first resistance and the second resistance couple formation.
2. a kind of furnace temperature instrument compensated with oxygen determination according to claim 1, is characterized in that: be also connected to the second polar capacitor between described positive complexing pin and ground end.
3. a kind of furnace temperature instrument compensated with oxygen determination according to claim 2, is characterized in that: be also connected to the 3rd polar capacitor between described positive complexing pin and negative complexing pin.
4. a kind of furnace temperature instrument compensated with oxygen determination according to claim 3, is characterized in that: described low-dropout regulator model elects LT1185 as.
5. a kind of furnace temperature instrument compensated with oxygen determination according to claim 1 or 2 or 3 or 4, is characterized in that: described signal amplification circuit comprises
First amplifier, positive input terminal and output terminal couple and are connected to positive oxygen gesture signal pin;
Successively series electrical source and ground hold between the second partial pressure unit of forming of the 4th resistance, the 5th resistance and the 6th resistance, the negative input end of described first amplifier is connected to the node between the 5th resistance and the 6th resistance;
Second amplifier, its positive input terminal ground connection, its negative input end is connected to negative oxygen gesture signal pin, is also coupled with the 7th resistance between its input end and negative input end;
3rd amplifier, its positive input terminal ground connection, is coupled with the 8th resistance between the output terminal of its negative input end and the second amplifier, be coupled with the 9th resistance between its output terminal and negative input end.
6. a kind of furnace temperature instrument compensated with oxygen determination according to claim 5, is characterized in that:
Described 9th resistance is adjustable resistance.
7. a kind of furnace temperature instrument compensated with oxygen determination according to claim 6, is characterized in that: the node between described 4th resistance and the 5th resistance and ground are also connected to voltage stabilizing diode between holding, and the anode of described voltage stabilizing diode is held with being connected to.
8. a kind of furnace temperature instrument compensated with oxygen determination according to claim 7, is characterized in that: the node between described 4th resistance and the 5th resistance and ground are also connected to the 4th electric capacity between holding.
9. a kind of furnace temperature instrument compensated with oxygen determination according to claim 8, is characterized in that: described first amplifier and the 3rd Amplifier Model elect 0P07 as.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520015735.1U CN204422104U (en) | 2015-01-10 | 2015-01-10 | A kind of furnace temperature instrument compensated with oxygen determination |
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| CN201520015735.1U CN204422104U (en) | 2015-01-10 | 2015-01-10 | A kind of furnace temperature instrument compensated with oxygen determination |
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| CN204422104U true CN204422104U (en) | 2015-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113196046A (en) * | 2018-12-17 | 2021-07-30 | Tdk株式会社 | Gas sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113196046A (en) * | 2018-12-17 | 2021-07-30 | Tdk株式会社 | Gas sensor |
| CN113196046B (en) * | 2018-12-17 | 2024-03-08 | Tdk株式会社 | Gas sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20170110 |