CN2062442U - Eight-way measuring and eight-way circulation temp. measuring display - Google Patents

Abstract

The utility model discloses an eight-way measuring and eight-way circulation temperature measuring display instrument which can simultaneously measure, can simultaneously display and can simultaneously control the temperature from a plurality of ways. The eight-way measuring and eight-way circulation temperature measuring display instrument is mainly composed of a signal input module, a voltage/frequency converter, a CPU, an audible and visual alarm unit, a display unit, a keyboard input unit and a power supply. The signal input module can be singly made into various different signal input modules according to the need for realizing the range of temperature measurement and various requirements, which is fit for the matching requirement of various thermocouples and temperature sensors. The temperature measuring instrument has high precision, and the range of temperatures which are measured can be wide. The overall process of the temperature variation of the object which is controlled can be recorded for a long time.

Description

Eight-way measuring and eight-way circulation temp. measuring display

The utility model is a kind of temperature survey and temperature controlled instrument of being used for, and belongs to thermometric technical field.

The kind of Temperature-controlled appliance has many, but various temperature controllers need the various corresponding thermal sensors of adapted, the promptly corresponding occasionally thermal resistance of supporting thermoelectricity that uses, because the temperature range and the measuring accuracy of employed scope of various thermopair and thermometric are different, if want the corresponding thermopair that uses of temperature controller, then make the usable range of temperature controller be subjected to certain restriction.In addition, the control way of general temperature controller is limited, be generally one the road or two-way, and the occasion that needs multi way temperature control and multichannel to show, the method of using adopts many temperature controllers often, and this has not only increased user's equipment investment, and when using because number of devices is many, it is big to take the place, feels inconvenient during use.

Goal of the invention of the present utility model is exactly that practical problems at above existence designs, thereby a kind of eight drive test amounts and eight tunnel circulation demonstration temperature measurers have been made, this temperature measurer have measure and the way of control many, the measuring accuracy height, to various thermoelectricity occasionally thermal resistance all can be suitable for.

Eight drive test amounts of the present utility model and eight tunnel circulations show temperature measurer, mainly are made up of signal input block (1), V/F converter (being electric voltage/frequency converter) (2), CPU (central processing unit) (3), acousto-optic warning unit (4), display unit (5), keyboard input block (6), power supply (7).Wherein signal input block (1) requires to be designed to the different input block of polylith according to different thermometrics, during use, as long as use corresponding signal input block (1) as requested.Now, adopt AD590 to be described below as signal input block (1) circuit of sensor to be applicable to-55 ℃～150 ℃.

Signal input block (1) is made up of sensor and current/voltage-converted circuit, sensors A D590 has eight, be used for the collecting temperature signal, because AD5 is an amperometric sensor, so behind sensor, be connected to the current/voltage-converted circuit, this circuit will convert the Celsius temperature that voltage signal is represented with the absolute temperature that current signal is represented to, through multi-way switch " 4051 " timesharing gating, carry out voltage, frequency transformation through V/F converter (2) again, then by the counter " T in the microprocessor " 8031 " ₁" calculate pulse number in the standard time, finish the process that analog signal conversion is become digital signal.

Adopt integrated circuit " 2764 " expansion EPROM, " 6264 " expansion RAM, integrated circuit " 8279 " is finished the exchange and the Presentation Function of keyboard signal, " 74LS373-1 " is address latch, and " 74LS138 " is code translator, finishes the address assignment to different integrated circuit (IC) chip, " 74LS373-2 " is latch, finish warning function, " 74LS75 " also is latch, finishes the gating to multicircuit switch " 4051 ".Based on foregoing circuit, having constituted with single chip microcomputer " 8031 " is the microcontroller system of core, i.e. CPU (central processing unit) (3).Finish dealing with circulation demonstration, warning, relay control action pass through with temperature measurement signal in this system, functions such as thermometric storage and printing.Join different thermopair tablets, not only can adapted T, E, J, K, S, Type B galvanic couple commonly used, and thermopair that can the adapted special requirement is as tungsten nickel thermopair.

Adopt eight drive test amounts of the present utility model and eight tunnel circulations to show temperature measurer, its advantage is that the control way of this temperature measurer is many, but a tractor serves several purposes, and applied widely to various thermopairs and thermal resistance, to different thermopairs, as long as change its signal input block in use.Just can use.Therefore the temperature controlling range of this temperature measurer is very wide, and the control accuracy height, and adaptability is strong, and antijamming capability is strong.In addition, this temperature measurer not only can multichannel measurement, multichannel control, and can the multichannel circulation show, can also be with the data-storing of being surveyed, if every 10 minutes once, can deposit three days measurement data at most with the temperature measurement data storage, at any time it can be accessed and check, analyze, to improve the quality of product, cut down the consumption of energy, to guaranteeing safety in production important meaning is arranged.

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is a general structure synoptic diagram of the present utility model.

Fig. 3 is a signal input block electrical schematic diagram.

Fig. 4 is a V/F translation circuit schematic diagram.

Fig. 5 warning circuit schematic diagram.

Fig. 6 passage display unit circuit schematic diagram.

Be described further below in conjunction with embodiment of the present utility model.

Signal input block (1) is made up of 8 sensors and 8 tunnel current/voltage-converted circuit and a multicircuit switch, the model that sensor is selected for use is " AD590 ", 8 sensors A, B, C, D, E, F, G, H is connected on respectively between positive supply and the current/voltage-converted circuit, the current/voltage-converted circuit is a core with 2 integrated circuit " 324 " respectively, every integrated circuit " 324 " has 4 operational amplifiers, make the parallel circuit of 4 current/voltage-converted respectively, the output terminal of its each operational amplifier is connected on transistorized base stage respectively, in-phase input end connects negative supply, end of oppisite phase is connected on the transistorized emitter, transistorized collector joins with " AD590 " by a diode, transistorized collector also is connected with the input end of multicircuit switch " 4051 " respectively as signal output part simultaneously, the output terminal of multicircuit switch " 4051 " is " 3 " pin, and is connected to V/F transducer (2).

V/F transducer (2) is mainly based on ic lm331, signal from multi-way switch links to each other with the input end (being the IN end) of " LM331 " through operational amplifier " 353 ", the in-phase end of operational amplifier " 353 " is that signal input part links to each other with the output terminal of multi-way switch " 4051 ", and end of oppisite phase links to each other with its output terminal.The output terminal out termination photoelectrical coupler of " LM331 ", its signal are delivered to CPU (central processing unit) (8031) by photoelectrical coupler output after conversion.

CPU (central processing unit) (3) is a core with microprocessor " 8031 ", be equipped with code translator " 74LS138 ", address latch " 74LS373-1 ", latch " 74LS373-2 ", memory " 2764; 6264 " is formed a central control system, the output control terminal of its " 8031 " is controlled way respectively and is shown, relay control, print etc., the address bus DB of " 8031 ", the corresponding respectively and address latch 74ls373-1 of control bus CB, EPROM2764, RAM6264 and keyboard input are connected with the port of display control circuit " 8279 ", input signal from the V/F converter is connected on the " T of " 8031 " ₁" end.

Warning circuit mainly by integrated circuit " 74LS373 " as latch, add that audio frequency oscillator and driving circuit that gate circuit is formed form eight input end D of 74LS373 ₁～D ₈Meet the P of central processing unit 8031 ₀Mouthful, " public enabling " end of this latch (being the C end) is as the gating end of alarm, its output terminal Q ₁～Q ₈Be connected on respectively on the input end of eight input end Sheffer stroke gates, the output terminal of this Sheffer stroke gate links to each other with the input end of photoisolator, the audio oscillator circuit that the output termination that photoelectricity is isolated is made up of gate circuit, and the output of this audio oscillator circuit connects by transistor " Q ₁, Q ₂" driving circuit formed, its transistor " Q ₁, Q ₂" mid point connect a capacitance, be connected in series again afterwards loudspeaker to ground.So just formed a complete warning circuit.

The passage display circuit is by display DG01～DG04 and transistor Q ₃～Q ₆Constitute, the control signal of this partial circuit is from integrated circuit " 8279 " and " 8031 ".Integrated circuit " 8279 " is mainly finished keyboard input and Presentation Function, because " 8279 " can only drive 16 displays, and in this circuit, each road needs 4, need 4 but the way on each road shows, promptly in circulation shows, finish demonstration 1,2,3,4 or 5,6,7,8 according to needs.Therefore this circuit requires to have done processing at the control section of " 8031 " in view of the above.When measuring 1～4 road temperature signal, as long as give the P1.1 mouth software set of " 8031 ", then DG01～DG04 shows 1,2,3,4; When measuring 5～8 road temperature signals, be " 0 " as long as put the P1.1 mouth of " 8031 " with software, then DG01～DG04 shows 5,6,7,8.Therefore transistor Q on line construction ₃, Q ₄Emitter link together and link to each other transistor Q with " 4,9 " end of display DG01 " 2,7,9,10 " end, DG02 and " 1.2:7 " end of DG04 respectively ₃, Q ₄Base stage also link together, and pass through resistance R ₁₁With phase inverter F ₁Output terminal be connected.Transistor Q ₅, Q ₆Emitter also link together, and be connected transistor Q with " 2,10 " end of display DG01 and DG02 " 6 " end and DG03 ₅, Q ₆Base stage also link together, pass through resistance R ₁₂With phase inverter F ₂Output terminal join phase inverter F ₂Input end and phase inverter F ₁Output terminal link to each other phase inverter F ₁Input end be signal input end, and be connected with the P1.1 mouth of chip microprocessor " 8031 ".

Just can make eight drive test amounts of the present utility model and eight tunnel circulation demonstration temperature measurers according to the above.

Claims (2)

1, the temperature measurer that a kind of eight drive test amounts and eight tunnel circulations show, by thermal sensor, signal processing circuit, display circuit and control circuit are formed, it is characterized in that this temperature measurer is mainly by signal input block (1), V/F transducer (2), CPU (central processing unit) (3), acousto-optic warning unit (4), display unit (5), keyboard input block (6) and power supply (7) are formed, wherein the input of eight road temperature signals in the signal input block (1) is made up of eight road current/voltage translation circuits and eight temperature sensors respectively, eight input ends of multi-way switch " 4051 " connect respectively in eight tunnel current/voltage-converted circuit, transistorized collector; V/F converter (2) mainly is made of integrated circuit " LM331 ", its signal input part links to each other with the output terminal and the inverting input of operational amplifier " 353 " by a current-limiting resistance, and the in-phase end of this operational amplifier input end links to each other with the output terminal of multi-way switch " 4051 "; CPU (central processing unit) (3) mainly adds that by chip microprocessor " 8031 " latch and memory are constituted.

2, eight drive test amounts according to claim 1 and eight tunnel circulations show temperature measurer, it is characterized in that in the described acousto-optic warning unit (4) transistor Q ₃, Q ₄Base stage connect together, pass through resistance R ₁₁With phase inverter F ₁Output terminal links to each other, transistor Q ₃, Q ₄Emitter connect together and link to each other transistor Q with " 4,9 " of display DG01 " 2,7,9,10 ", DG02, " 1,2,7 " end of DG04 respectively ₅, Q ₆Emitter link together, and be connected transistor Q with " 2,10 " end of display DG01 and DG02 " 6 " end and DG03 respectively ₅, Q ₆Base stage link together, and pass through resistance R ₁₂With phase inverter F ₂Output terminal be connected phase inverter F ₂Input end and phase inverter F ₁Output terminal join phase inverter F ₁Input end be signal input end, link to each other with the P1.1 mouth of chip microprocessor " 8031 ".

Images