CN2081530U

CN2081530U - P-n junction sensor for measuring and controlling temp.

Info

Publication number: CN2081530U
Application number: CN 90219519
Authority: CN
Inventors: 文景铭; 李树阁
Original assignee: BADA HIGH SCHOOLS SCIENCE AND TECHNOLOGY DEVELOPMENT GROUP LIAONING PROV
Current assignee: BADA HIGH SCHOOLS SCIENCE AND TECHNOLOGY DEVELOPMENT GROUP LIAONING PROV
Priority date: 1990-10-15
Filing date: 1990-10-15
Publication date: 1991-07-24

Abstract

The utility model relates to a P-N junction sensor for measuring and controlling temperature which belongs to a temperature measuring element. The utility model comprises a PN junction sensor and temperature measuring and controlling control circuit, and the controlling control circuit is composed of a deviation electric bridge circuit, a magnifying circuit, a fixed value comparing circuit, a regulation drive circuit and a display converting circuit. The utility model has the advantages of high temperature measuring and controlling precision, fast response speed, low cost, good linearity, etc. The P-N junction sensor for measuring and controlling temperature is in particular suitable for the temperature measure and control of the liquid medium and the gas medium of-50 DEG to 180 DEG.

Description

P-N junction sensor for measuring and controlling temp.

The utility model relates to a kind of PN junction sensor that is used for the observing and controlling temperature.Belong to temperature-measuring element, be particularly suitable for the liquid in-50～180 ℃ of scopes, the observing and controlling temperature use of gas medium.

The sensor that in the past was used for the observing and controlling temperature is as generally adopting thermopair as sensor on all kinds of thermal treatment electric furnaces; The occasion that also has is used thermistor, platinum resistance; Also have with electric contact thermometer as to liquid, sensor when gas medium carries out temperature control, the sensor all in various degree have that temperature measurement accuracy is lower, response speed slow, linear shortcomings such as poor, what also have influences it and promotes the use of than higher because of its cost.

The purpose of this utility model be to utilize transistorized PN junction positive bias value to change with medium temperature and the principle of respective change provide a kind of simple in structure, observing and controlling temperature accurately, fast, the good linearity of response speed, PN junction sensor that cost is low.

The purpose of this utility model realizes by the following technical solutions, by sensor and in observing and controlling temperature control circuit plate is housed temperature controller form, described sensor comprises that the PN junction core of sensor housing, triode is loaded in the temperature probe of sensor housing front end, and two pin of PN junction pass the caulking gum cap that is loaded on the sensor housing tail end and link to each other with a brachium pontis of the deviation electric bridge of observing and controlling temperature control circuit with lead; Described observing and controlling temperature control circuit comprises that deviation electric bridge, amplification, definite value compare, regulate driving and show the change-over circuit composition.

The utility model compared with prior art, and by model machine observing and controlling temperature proof in its applicable scope, have that survey, temperature-controlled precision height, response time are fast, cost is low has an advantage such as favorable linearity, it is easy to implement simultaneously, is beneficial to and applies.

Fig. 1 is the main TV structure of sensor and the contour structures synoptic diagram of controller.

Fig. 2 is an observing and controlling temperature functional-block diagram of the present utility model.

Fig. 3 is the control circuit schematic diagram of the utility model observing and controlling temperature.

Fig. 4 is the circuit theory diagrams of power supply of the present utility model.

Load circuit figure when Fig. 5 controlling object is electrical heating.

Fig. 6 is definite value warning circuit figure.

Fig. 7 is the V-T performance diagram.

Embodiment of the present utility model is described in conjunction with the accompanying drawings, sensor housing 5 usefulness stainless steel pipes process from strand, be contained in the front end of sensor housing 5 by the collet 4 of fiberglass through stamping forming temperature probe 2 with stainless sheet steel, the PN junction core 1 of triode is loaded on its interior restricted plug, two pin 3 of PN junction pass the inner chamber that restricted plug puts in sensor housing 5, pass the caulking gum cap 6 that is loaded on sensor housing 5 tail ends with lead 7 and link to each other with a brachium pontis of the deviation electric bridge of the control circuit of observing and controlling temperature; The panel of temperature controller shell is provided with that temperature value numeral shows 9, temperature regulating and controlling knob 8, power switch 11, relay indicating light 10, a side are provided with power supply line 12 and with the line 13 of controlling object, be equipped with in it comprise deviation electric bridge, amplifier, definite value relatively, regulate the observing and controlling temperature control circuit plate that drives, shows conversion and definite value warning circuit.Its PN junction makes the V of PN junction as brachium pontis of electric bridge _BePositive bias guarantees operating voltage 0.7V, and bridge arm unit adopts the resistance with temperature compensation.

The gas that the utility model can be right-50～180 ℃, the temperature of liquid medium system monitor, report to the police and in addition numeral show, the temperature probe 2 of the PN junction sensor that will demarcate with the scaling method of standard earlier during use places monitored medium, then will connect the lead 13 and load R of controlling object if this system is electrical heating _LJoin as shown in Figure 6, begin thermometric or monitoring then, PN junction is changed by medium temperature, produce mV signal imitation amount, this analog quantity detects deviate through the deviation electric bridge and sends into amplifier again and be enlarged into the definite value amount, by definite value comparer and set-point relatively, meanwhile this definite value amount is sent into the temperature that numerical value that the temperature display converter provides is detected system medium this moment; If the detected value by the definite value comparer is during less than set-point, the definite value comparer is output as " 1 ", high level, the former duty of this system held this moment; If during more than or equal to set-point, the definite value comparer is output as " 0 ", low level, this moment, this low level signal was admitted to the adjusting driver, regulate the work of driver halt system, output signal after meanwhile the definite value comparer will compare is sent into the definite value alarm, and the temperature value of being monitored is carried out sound and light alarm.

Claims

A kind of PN junction sensor that is used for the observing and controlling temperature, by sensor and in observing and controlling temperature control circuit plate is housed temperature controller form, it is characterized in that described sensor comprises that the PN junction core 1 of sensor housing 5, triode is loaded in the temperature probe 2 of sensor housing 5 front ends, two pin 3 of PN junction pass the caulking gum cap 6 that is loaded on the sensor housing tail end and link to each other with a brachium pontis of the deviation electric bridge of observing and controlling temperature control circuit with lead 7; Described observing and controlling temperature control circuit comprises that deviation electric bridge, amplification, definite value compare, regulate driving and show change-over circuit.