CN2096748U - Explode preventing type temp. surveying control instrument - Google Patents
Explode preventing type temp. surveying control instrument Download PDFInfo
- Publication number
- CN2096748U CN2096748U CN 91202250 CN91202250U CN2096748U CN 2096748 U CN2096748 U CN 2096748U CN 91202250 CN91202250 CN 91202250 CN 91202250 U CN91202250 U CN 91202250U CN 2096748 U CN2096748 U CN 2096748U
- Authority
- CN
- China
- Prior art keywords
- temperature
- control
- control instrument
- measurement
- instrument according
- 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.)
- Withdrawn
Links
Images
Abstract
The utility model discloses an explosion preventing type temperature surveying control instrument, comprising an explosion preventing casing, a digital electronic thermometer, and a temperature control system. The explosion preventing type temperature surveying control instrument has the advantages of visual display, high measuring precision, sensitive response, and accurate control. The utility model is suitable for the temperature measurement and control of equipment and various media in places with flammable material, such as coal, oilfield, chemical industry, etc.
Description
The utility model relates to a kind of flame-proof type temperature measuring and controlling instrument (hereinafter to be referred as measurement and control instrument), and it comprises flameproof enclosure, electronic thermometer and temperature control part branch.
Present stage, the temperature of explosion-proof place use was counted pressure type flame-proof type thermometer, and the shortcoming of this thermometer is a lot:
1, precision is low: full accuracy can only reach 2.5 grades;
2, error is big;
3, poor stability: when pressure-type thermometer is worked in low temperature and hot environment, poor heat stability, when the thermometer system sealing is not good, cause inflate and externally let out that to be directed at error increasing;
4, reaction sensitivity is low, inertia is big;
5, when this thermometer is had two during with upper contact as controller,, and bring very big departure because rubbing action causes the temperature controlling point drift.
At present the temperature measurement-control instrument that uses in explosion-proof place does not also solve above several problems, and pressure type temperature fathometer is done precision measurement and when controlling, be very inapplicable.
The purpose of this utility model provides a kind of high precision, high stability, reaction rapid sensitive, the flame-proof type temperature measuring and controlling instrument of precise control.
The utility model is realized by flameproof enclosure, electronic thermometer and temperature control system three parts.
The utility model is because adopted digital demonstration electronic thermometer, make that demonstration is accurate and visual, temperature measurement fraction has adopted intrinsic safety type semiconductor transducer or integrated sensor to make that the reaction of thermometer is fast, equilibration time is short, inertia is little, stability greatly improves, after temperature signal is done impedance conversion via voltage follower, display error is littler, precision improves, and the contactless control system that control system has adopted voltage comparator to form, departure reduces, owing to taked above measure to improve reliability of system operation greatly.
Be described in detail below with reference to three parts of accompanying drawing utility model
The shell of this measurement and control instrument is made less than 0.5% metal or antistatic plastic by magnesium content, and it is by protecgulum 1, housing 2, and connector cover 3 is formed, and by fastening bolt 5 it is combined into a complete body.Fig. 3 is the general assembly drawing of this measurement and control instrument, on the appropriate location of protecgulum 1, have display window 4, it is by rubber blanket 6, flame proof glass 7, it is explosion-proof that pressing plate 9 and fastening bolt 10 are formed sealing, protecgulum 1 and housing 2, housing 2 adopts plane or fixing structure with connector cover 3 explosion suppresion surfaces 8, electron temperature measurement controller 11 is housed in housing 2, glue seal structure 12 is adopted in being electrically connected of measurement and control instrument and terminal box, terminal block 13 is installed in terminal box 3, and it is explosion-proof that the terminal box line outlet is formed sealing by rubber seal 15 and gland nut 16, and temperature probe enters terminal box by line outlet.Have at the obvious place of flameproof enclosure permanent clear marking " Ex " and "
", "
" near be provided with external ground bolt 14.Fig. 4, Fig. 5, Fig. 6 are circuit diagrams of the present utility model, and T is the intrinsic safety type semiconductor transducer in Fig. 5, by the electric signal that is proportional to temperature of T output by R
13, T, R
14, W
4, R
15The electric bridge output of forming is via R
16, R
17Be input to operational amplifier A
7Handle by the b point through amplifying the back, Fig. 6 is for using the circuit diagram of integrated sensor, the electric signal that is proportional to temperature is exported through the b point, 3 of a among Fig. 5 or Fig. 6, b, c join with 3 of a, b, c among Fig. 4 and have just formed temperature measurement-control instrument, the electric signal of being imported by the b point in Fig. 4 is through accurate voltage follower ［ A
1Carry out impedance conversion, be input to the positive input terminal of digital instrument ［ DVP ］, stabilivolt ［ D
1, resistance ［ R
4, ［ R
5, potentiometer ［ W
3Composition dimension change-over circuit, voltage follower ［ A
2Forward transportation end input by potentiometer ［ W
3The electric potential signal adjusted, through ［ A
2Be input to the negative input end of ［ DVP ］, by regulator potentiometer ［ W
3Realize the demarcation that various temperature scale O are ordered.By among Fig. 4 as can be seen by potentiometer ［ W
2Voltage follower ［ A
3Voltage comparator ［ A
5The control system and the ［ W that form
1, ［ A
4, ［ A
6The system that forms is duplicate.Only provided two tunnel controls among the figure,, can on circuit, add more same system if need more control.Now only be illustrated, by potentiometer ［ W with one tunnel system
1The electric item obtained is through voltage follower ［ A
4Output, the one road to K switch
2, K closes
2, regulate ［ W
1Show the control temperature value by ［ DVP ］, this process is an initialization process, preset set finish after, disconnect K
2, the preset voltage of voltage follower output is through resistance ［ R
9Input to accurate voltage comparer ［ A
6Inverting input, by ［ A
1The measuring voltage of output is through ［ R
8Be input to ［ A
6Normal phase input end.When preset voltage during greater than measuring voltage, voltage comparator ［ A
6Be output as 0, and when preset voltage during less than measuring voltage, voltage comparator ［ A
6By B point output control signal, realize control automatically by auxiliary reclay.Since the contactless control system of having taked voltage comparator to form, the danger of having avoided contact switch may produce spark on the one hand, and contactless control system has been avoided the erosion of on-the-spot objectionable impurities on the other hand, has improved reliability of system operation greatly.
Claims (5)
1, a kind of flame-proof type temperature measuring and controlling instrument, it comprises flameproof enclosure, electronic thermometer and temperature control part branch, it is characterized in that temperature counts the digital display type electronic thermometer.
2, measurement and control instrument according to claim 1, the material that it is characterized in that shell are magnesium contents less than 0.5% metal or antistatic plastic.
3, measurement and control instrument according to claim 1 is characterized in that temperature sensor is intrinsic safety type semiconductor transducer or integrated sensor.
4, measurement and control instrument according to claim 1 is characterized in that temperature signal is input to digital instrument via the accurate voltage follower and shows measured value.
5, measurement and control instrument according to claim 1 is characterized in that contactless control system that temperature control is made up of voltage comparator is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202250 CN2096748U (en) | 1991-02-11 | 1991-02-11 | Explode preventing type temp. surveying control instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91202250 CN2096748U (en) | 1991-02-11 | 1991-02-11 | Explode preventing type temp. surveying control instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2096748U true CN2096748U (en) | 1992-02-19 |
Family
ID=4912838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91202250 Withdrawn CN2096748U (en) | 1991-02-11 | 1991-02-11 | Explode preventing type temp. surveying control instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2096748U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900634A (en) * | 2012-12-26 | 2014-07-02 | 中国人民解放军海军后勤技术装备研究所 | Explosion-proof temperature and humidity instrument |
| CN106482842A (en) * | 2016-08-28 | 2017-03-08 | 姜俊 | A kind of power distribution cabinet explosion protection system and its control method |
| CN109556751A (en) * | 2018-11-02 | 2019-04-02 | 湖北康利安动力科技有限公司 | A kind of explosion-proof sensor based on monitoring temperature |
-
1991
- 1991-02-11 CN CN 91202250 patent/CN2096748U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900634A (en) * | 2012-12-26 | 2014-07-02 | 中国人民解放军海军后勤技术装备研究所 | Explosion-proof temperature and humidity instrument |
| CN106482842A (en) * | 2016-08-28 | 2017-03-08 | 姜俊 | A kind of power distribution cabinet explosion protection system and its control method |
| CN109556751A (en) * | 2018-11-02 | 2019-04-02 | 湖北康利安动力科技有限公司 | A kind of explosion-proof sensor based on monitoring temperature |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0063213B1 (en) | Ph electrode | |
| US3562729A (en) | Two wire mv./v. transmitter | |
| JPH04505504A (en) | Thermocouple transmitter with cold junction compensation | |
| IE43515L (en) | Measuring contaminant in a gas sample | |
| CN206192402U (en) | Gaseous little water of SF6, density on -line monitoring system | |
| GB1229610A (en) | ||
| CN106610326A (en) | Tulip contact pressure electronic measuring instrument | |
| CN2096748U (en) | Explode preventing type temp. surveying control instrument | |
| Neville | Electrochemical device for measuring oxygen | |
| FR2426997A1 (en) | Voltage regulator for battery charging generator - is mounted on battery to obtain direct measurement of temp. | |
| Miura et al. | A four-probe type gas sensor using a solid-state proton conductor sensitive to hydrogen at room temperature | |
| Arndt | Micromachined thermal conductivity hydrogen detector for automotive applications | |
| CN2180987Y (en) | Thermocuple compensator | |
| US2977499A (en) | Electronic drift compensator | |
| US5081420A (en) | Method and apparatus for measuring hydrogen ion concentration and activity in an electrolyte | |
| WO1983004101A1 (en) | Oxygen analyzer | |
| CN2311773Y (en) | Boiler water quality monitoring instrument | |
| CN2300905Y (en) | Portable computerized moisture meter | |
| ALIYEV et al. | Measuring selsyn rotor angle of rotation converter(circuit diagrams) | |
| JPS6118453Y2 (en) | ||
| JPS57139631A (en) | Thermocouple temperature measuring device | |
| SU1404981A1 (en) | Electric potential meter | |
| JPS63233357A (en) | Dew point temperature output apparatus | |
| GB1512235A (en) | Electronic flow gauge | |
| SU1296868A1 (en) | Instrument transducer of pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |