CN2222905Y

CN2222905Y - intelligent liquid level and liquid weight calculating instrument

Info

Publication number: CN2222905Y
Application number: CN 94231315
Authority: CN
Inventors: 李溪婷
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-23
Filing date: 1994-11-23
Publication date: 1996-03-20
Anticipated expiration: 2004-11-23

Abstract

The utility model relates to a storage tank single liquid measuring device, comprising a tank, a pressure transmitter arranged on the tank (atmospheric vessel) or differential pressure transmitter (having pressure vessel). The Pt100 platinum resistance thermometer is arranged on the tank for detecting the temperature of the liquid in tank, compensating for the tank. The microcomputer circuits of the intelligent liquid level and liquid weight calculating instrument are connected with the output print and display devices, and the electric current signal of the pressure transmitter is calculated by computer for the weight and level of the liquid in the storage tank, alarming when the limit exceed. The utility model has the advantages of simple structure, precise calculation, high sensitivity, fast computation speed and reliable work. The instrument is an advanced liquid level and liquid weight calculation and detection device.

Description

The heavy calculus instrument of intelligent liquid level liquid

The utility model belongs to single liquid measurement mechanism in the storage tank.

At present measuring liquid level all adopts the method for level pressure sensor in wet tank, the conversion of signals of liquid level pressure is become the current signal of standard by the liquid level pressure unit, 0～10mA or 4～20mA output, so that and following measurement mechanism connects, advantage is that sign simple in structure is obvious, be easy to show use, but its deficiency is a function singleness, can only directly read by instrument, can't use for the container of outer standard.

For solving the deficiency of above measuring method, the purpose of this utility model: provide a kind of intelligent liquid level liquid heavy calculus instrument, by intelligent apparatus liquid level in the flow container and liquid are weighed measurement simultaneously, and, effectively realize the measurement that liquid level, liquid in the storage tank are weighed the way that non-standard capacity can compensate.

The utility model structural design is achieved in that the heavy calculus instrument of this liquid level liquid is by fluid reservoir (A), be installed in (B) Pt100 platinum resistance thermometer sensor, (C) of pressure unit (non-pressure vessel) on the fluid reservoir or differential pressure transmitter (pressure vessel is arranged), be installed in jar and go up detection pot liquid temperature, fluid reservoir is compensated, the demonstration printing equipment (E) of intelligent liquid level liquid re-computation instrument (D) and output is with it formed

Its particular circuit configurations is: the output terminal (I) of Pt100 platinum resistance thermometer sensor, temperature transmitter joins with an input end of multi-way switch (II), another road is pressure unit (or differential pressure transmitter) P/I (Δ P/I) input end (P), and inner base flow voltage input end adds the multi-way switch input end simultaneously, multi-way switch (III) output terminal links to each other with emitter follower (IV), emitter follower (IV) joins through photoelectrical coupler (V) and computing machine (X) CPU input end, CPU output is through photoelectrical coupler (VI), (VIII) respectively with alarm (VII), (IX) join, AH is a upper limit alarm, AL is that lower limit is reported to the police cpu data D ₀～D ₇Connect programmable counter/timer 8253.Its output converts the monostable pulse of solid rated capacity starting to through the long-pending 4～20mAI that zooms into of (XI) photoisolator (XII) more ₀Current signal, CPU are exported to 6 LED data presentation (XIII) simultaneously and are joined with printer (XIX).

Include keyboard circuit in the computing machine, single-chip microcomputer 8031, memory 6116, EPROM are 27128.More than device is for a kind of computerized intelligence instrument, and with the current signal of pressure unit (it is differential pressure transmitter that pressure vessel is arranged), the weight and the liquid level of liquid in the storage tank are obtained in the accurate calculation of machine as calculated, surpass operational height and report to the police.

Detailed circuit: Pt100 platinum resistance thermometer sensor, temperature transmitter is Pt platinum resistance thermometer sensor, and R ₁R ₂Form a Wheatstone bridge, electric bridge is exported through R ₄R ₅Connect the positive pole of operational amplifier F, negative input is done differential amplification, produces the Vt voltage signal and is input to multiway analog switch, W ₁For transferring span potentiometer, W ₂Be zeroising potentiometer (as shown in the figure); Digital quantity/analog quantity change-over circuit is that computer CPU is with the liquid level signal D that calculates ₀～D ₇Input programmable counter/timer 8253 converts the monostable pulse that pulse is directly proportional with liquid level to by 8253, and through the T transistor, photoelectrical coupler GDC isolation becomes DC voltage through capacitor C integration, again through T ₂, T ₃The triode direct current amplifies, and converts I to ₀Output realizes the conversion of D/A plan amount; Simulation volume/digital quantity change-over circuit is a multiway analog switch (CD4052), and it is one 4 and selects 1 multiway analog switch that pressure (differential pressure) signal converts 1～5V voltage to through Rin resistance and is added to multi-way switch A ₀, B ₀End, the voltage signal Ve and the O of temperature transmitter ₁V adds to A ₁, B ₁End, the reference voltage V of gauge internal _N, O ₂V adds to A ₂, B ₂End, the S that multi-way switch sends with CPU ₁, S ₀Address signal selects above-mentioned three signals to A, B output terminal, for preventing the influence of conducting resistance dispersiveness, add an input impedance of forming by operational amplifier F at A end, convert a series of pulse signals to through electric voltage frequency V/F again, through photoelectricity every device to Computer I NT ₀Mouth is for data processing.

The utility model has the advantages that simple in structurely, function is complete, and liquid level in the storage tank and liquid are heavy can be measured simultaneously, the precision height, and test speed is fast, adopts computer data to handle, and calculates accurately, and working stability is reliable.

Detailed structure of the present utility model is provided by following examples and accompanying drawing:

Fig. 1 is the heavy calculus instrument construction profile of intelligent liquid level liquid figure;

Fig. 2 is the heavy calculus instrument block diagram of intelligent liquid level liquid;

Fig. 3 is the heavy calculus instrument control circuit of intelligent liquid level liquid block scheme;

Fig. 4 measures the transmitter electrical schematic diagram for the heavy calculus instrument Pt100 of intelligent liquid level liquid platinum resistance thermometer sensor;

Fig. 5 is the heavy calculus instrument digital quantity of intelligent liquid level liquid/analog quantity conversion electrical schematic diagram:

Fig. 6 is the heavy calculus instrument analog quantity of intelligent liquid level liquid/digital quantity conversion electrical schematic diagram.

Its structure as described in Figure 1,1 is housing; 2 is framework; 3 is panel; 4 is 6 LED light; The data tube display screen; 5 are the major event demonstration; 6 are alarm indication; 7 is that secondary item code shows mouth; 8 is the printer and the indication of communicating by letter; 9 is 2 * 4 keyboards; 10 is main printed circuit board; 11 is power transformer; 12 is printing interface; 13 is connection terminal, structured flowchart as shown in Figure 2, A is that fluid reservoir: B is pressure unit (non-pressure vessel) or the differential pressure transmitter (pressure vessel is arranged) that is installed on the fluid reservoir; C is the Pt100 platinum resistance thermometer sensor; D is that liquid re-computation instrument and E export the demonstration printing equipment with it.Whole letter instrument is the standard plug-in unit form.

Claims

1. an intelligent liquid level liquid weighs calculus instrument, it is characterized in that this calculus instrument is by fluid reservoir (A), be installed in flexible device (non-pressure vessel) of pressure on the fluid reservoir or the flexible device of differential pressure (pressure vessel is arranged) (B), Pt100 platinum resistance thermometer sensor, (C), be installed in a jar last tracer liquid temperature, fluid reservoir is compensated, the demonstration printing equipment (E) of intelligent liquid level liquid re-computation instrument (D) and output is with it formed, its connection is that the output terminal (I) of Pt100 platinum resistance thermometer sensor, temperature transmitter and an input end of multi-way switch (III) join, and another road is transmitter (or differential pressure transmitter) input end P and inner reference voltage input (II) V _NJoin with multi-way switch (III) simultaneously, multi-way switch (III) output terminal and emitter follower (IV) join, emitter follower (IV) joins with computer CPU input port INT0 through photoelectrical coupler (V), CPU output is joined with alarm (VII), (IX) respectively through photoelectrical coupler (VI), (VIII), AH is a upper limit alarm, AL is that lower limit is reported to the police cpu data D ₀～D ₇Connect programmable counter/timer 8253, its output is through (XI) photoisolator, and integration amplifies (XII) and becomes 4～20mAI.Current signal output, CPU output is simultaneously joined with 6 LED data presentation (XIV) and computing machine (XIX).

2. by the described calculus instrument of claim 1, it is characterized in that described Pt100 platinum resistance thermometer sensor, temperature transmitter is Pt100 platinum resistance thermometer sensor, and R ₁R ₂Form a Wheatstone bridge, electric bridge is exported through R ₄R ₅The positive pole that connects operational amplifier F, cathode output end is input to multi-way switch (III) for the big Vt voltage signal of difference amplifier, and W1 is for transferring the range electric position, and W2 is a zero potentiometer.

3. by the described calculus instrument of claim 1, it is characterized in that described digital quantity/analog quantity change-over circuit is that computer CPU is with the liquid level signal D that calculates ₀～D ₇Input programmable counter/timer 8253 converts the monostable pulse that pulse is directly proportional with liquid level to by 8253, and through the T transistor, photoelectrical coupler GDC isolation becomes DC voltage through capacitor C integration, again through T ₂, T ₃The triode direct current amplifies, and converts I to ₀Output realizes the conversion of digital-to-analog amount;

4. by the described calculus instrument of claim 1, it is characterized in that it is a multiway analog switch (CD4052) that described analog quantity/digital quantity connects circuit, it is one 4 and selects 1 multiway analog switch that pressure (differential pressure) signal converts 1～5V voltage to through Rin resistance and is added to multi-way switch A ₀, B ₀End, the voltage signal Ve and the O of temperature transmitter ₁V adds to A ₁, B ₁End, the reference voltage V of gauge internal _N, O ₂V adds to A ₂, B ₂End, the S that multi-way switch sends with CPU ₁, S ₀The location signal selects above-mentioned three signals to A, B output terminal, for preventing the influence of conducting resistance dispersiveness, adds an input impedance of being made up of operational amplifier F at the A end, converts a series of pulse signals to through electric voltage frequency V/F again, through photoelectricity every device to Computer I NT ₀Mouth is for data processing.