CN204065855U - A kind of novel intelligent pH measure and control device - Google Patents
A kind of novel intelligent pH measure and control device Download PDFInfo
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- CN204065855U CN204065855U CN201420406067.0U CN201420406067U CN204065855U CN 204065855 U CN204065855 U CN 204065855U CN 201420406067 U CN201420406067 U CN 201420406067U CN 204065855 U CN204065855 U CN 204065855U
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Abstract
The utility model discloses that a kind of novel intelligent pH measure and control device comprises pH controller, change-over switch, acid adding pump, adds alkali pump, acid adding pump junction block, add alkali pump junction block and pH combination electrode; Also comprise pH real-time data acquisition and curvilinear recorder; PH controller adopts U.S. alpha pH1000 type controller, is integrated with lower limit relay, upper limit relay and 4-20mA current transducer; Add alkali pump for the alkali lye in alkali bottle is injected reaction vessel; Acid adding pump is used for the acid solution stored in demijohn to inject reaction vessel; PH combination electrode is placed in reaction vessel for the current pH value of detection reaction liquid in containers; PH combination electrode is connected with the signal input part of pH controller; The output termination pH real-time data acquisition of the 4-20mA current transducer of pH controller and curvilinear recorder.This novel intelligent pH measure and control device is easy to implement, and control accuracy is high.
Description
Technical field
The utility model relates to a kind of novel intelligent pH measure and control device.
Background technology
At home and abroad on market, industrial various pH TT&C system are very universal, but, current domestic and international market is not applicable to the product of the small-sized pH TT&C system of the advanced person of use for laboratory.In existing many pH TT&C system products, just simply use a pH controller and one or the TT&C system easy device constructed by two simple liquid pumps, panel only has rotating, there is no speed governing knob, that is, the speed of liquid pump is fixing, and control mode is limit O N/O F F.
Through retrieval, existing PH controller, generally adopt the mode of operation adding separately acid or alkali, as the acid-base neutralization controller that application number is 200910116101.4, realize ph value based on pid and fuzzy control to regulate, debugging and control procedure complexity, application number is a kind of PH controller of 201320744260.0, major function just carries out pH value measurement, cannot realize the control of pH value.
Publication number is solution ph controlled system with self-regulation and the autocontrol method (application number 200410043812.0) thereof of CN1598729A, there is pH value collection and temperature collection circuit, and fluid filling pump and well heater, be respectively used to adjust ph and regulate temperature, but its control method itself is very simple, and be the mode adopting the limit to control, control accuracy is low, be belong to extensive control mode, many times cannot meet the requirement of user.
Therefore, be necessary to design a kind of novel intelligent pH measure and control device.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of novel intelligent pH measure and control device, and this novel intelligent pH measure and control device structure is simple, and feature richness is easy to implement.
The technical solution of utility model is as follows:
A kind of novel intelligent pH measure and control device, comprises pH controller, change-over switch, acid adding pump, adds alkali pump, acid adding pump junction block, adds alkali pump junction block and pH combination electrode; Also comprise pH real-time data acquisition and curvilinear recorder;
PH controller adopts U.S. alpha pH1000 type controller, is integrated with lower limit relay, upper limit relay and 4-20mA current transducer;
Acid adding pump junction block, add alkali pump junction block and all adopt direct current 24V to power;
Be integrated with 2 handover modules in change-over switch, the lead-out terminal of a side joint lower limit relay of first handover module, opposite side is connected with 2 control terminals added on alkali pump junction block, and these 2 control terminals connect 2 feeder ears of plus-minus pump;
The side of second handover module connects the lead-out terminal of limit relay, and opposite side is connected with 2 control terminals on acid adding pump junction block, and these 2 control terminals connect 2 feeder ears of acid adding pump; [principle of work illustrates: under change-over switch is in linkage pattern, during the lead-out terminal short circuit of lower limit relay (being equivalent to normally opened contact close), 24V direct current is loaded into the feeder ear of alkali pump by the lead-out terminal of this lower limit relay, plus-minus pump startup; In like manner, under change-over switch is in linkage pattern, during the lead-out terminal short circuit of upper limit relay (being equivalent to normally opened contact close), 24V direct current is loaded into the feeder ear of acid adding pump by the lead-out terminal of this upper limit relay, acid adding pump startup]
Described acid adding pump and add alkali pump and be peristaltic pump;
Add alkali pump for the alkali lye in alkali bottle is injected reaction vessel; Acid adding pump is used for the acid solution stored in demijohn to inject reaction vessel; PH combination electrode is placed in reaction vessel for the current pH value of detection reaction liquid in containers; PH combination electrode is connected with the signal input part of pH controller;
The output termination pH real-time data acquisition of the 4-20mA current transducer of pH controller and curvilinear recorder.
[pH controller adds alkali pump by lower limit Control and supplement alkali lye in reaction vessel, in reaction vessel, supplement acid solution by upper limit Control acid adding pump, make the pH value convergence in reaction vessel and reach the pH value (and constant in this pH value rapidly) of a certain setting.】
PH combination electrode is the pH combination electrode with pT100 temperature compensation;
PH real-time data acquisition and curvilinear recorder has the serial line interface communicated with host computer.[signal received can change into after digital signal stores and again this digital signal is transferred to host computer by RS-232 by pH real-time data acquisition and curvilinear recorder].
PH real-time data acquisition and curvilinear recorder are provided with the USB interface for connecting USB flash disk.
The supply side adding alkali pump and acid adding pump is all parallel with a pump operation status surveillance branch road; Described pump operation status surveillance props up routing resistance and Diode series forms.
Controller adopts pulse length ratio to control (PLC) mode or limit control (ON/OFF) mode controls acid adding pump and add alkali pump to control to realize pH value; The control mode that the alpha pH1000 type pH controller that these two kinds of modes are the U.S. carries; user is without the need to relating to programming; only need by button Offered target pH value, thus the utility model does not relate to any method characteristic, belongs to the protect object of utility model.
PLC control procedure is:
Step 1: setup parameter:
(1) Offered target pH value SP_obj:alpha pH1000 type controller, can pass through lower limit pH value SP1 and upper limit pH value SP2 setup parameter, as long as meet SP1 < SP2, pH controller can automatic decision.Under usual service condition, in whole observing and controlling process, only has a fluid filling pump in work, another fluid filling pump is not done, that is, only control a pH set-point, if the traffic ability needing acid adding or add alkali doubles, can SP1=SP2 be set, and all be set as lower limit L/L or upper limit H/H, namely a pH reference mark can control two pumps simultaneously and adds alkali or acid adding, simultaneously acid adding or when adding alkali, need 2 pumps all acid solution bottles or all connect alkali lye bottle, the traffic ability adding alkali or acid adding is now by double.
(2) Set scale band within the scope of 10-200%;
Proportional band refers to that a pH from a certain pH value SP0 to SP_obj is interval; Only have after pH value enters this pH interval, controller unbalanced pulse width ratio control model; Value is less shows SP0 more close to SP_obj, and namely the width in this pH interval is less;
(3) recurrence interval T is set in 0.5 ~ 20 second;
Under pulse width control pattern, what relay exported is clock.Switch periods T is fixing.Depend on the difference with setting value, it is consistent that the time of switch open increases with reducing with proportional range XP.That is: t
oN+ toff=T (fixing), it is far away that proportional band departs from target, and ON is larger, and when XP exceeds the proportional band of user's setting, relay keeps long open state, and now, peristaltic pump carries out in the mode of constant current.
When peristaltic pump enters to proportional band in the above described manner, under the acting in conjunction of proportional band and recurrence interval T, the flow of liquid with the form of progressively successively decreasing close to and arrive SP_obj.
Step 2: closed-loop control PLC controls:
Current pH value is x, as x < SP_obj, implements to add alkali and controls; As x > SP_obj, implement acid adding and control;
(1) add alkali to control:
When not entering proportional band, when namely current pH value is not positioned at described pH interval, adds the state that alkali pump keeps standard-sized sheet, add alkali with the flow of 100%;
After entering proportional band, controller starting impulse width ratio control model, namely in each recurrence interval T, certain a period of time t
oNinterior lower limit relay is in unlatching (ON) state, the other times t in this recurrence interval T
oFFinterior lower limit relay is in cut out (OFF) state; t
oNthe length of time is determined by error e, and e=abs [SP_obj-x], abs [.] expression takes absolute value;
(2) acid adding controls:
When not entering proportional band, namely current pH value be not positioned at described pH interval time, acid adding pump keeps the state of standard-sized sheet, with the flow acid adding of 100%;
After entering proportional band, controller starting impulse width ratio control model, namely in each recurrence interval T, certain a period of time t
oNinterior upper limit relay is in unlatching (ON) state, remaining time t in this recurrence interval T
oFFinterior upper limit relay is in cut out (OFF) state; t
oNthe length of time is determined by error e, and e=abs [SP_obj-x], abs [] expression takes absolute value;
If be provided with 2 target phs: lower limit pH value SP1, upper limit pH value SP2, SP1 < SP2; Then perform following control:
As x < SP1, replace SP_obj with SP1, the alkali that adds described in execution controls;
As x > SP2, replace SP_obj with SP2, the acid adding described in execution controls.
The limit controls (ON/OFF) mode: first select control model to be ON/OFF, then after setting SP1 and SP2, can by controlling automatically to implement to control, this Schema control precision is not good enough, but reaction velocity is fast, much not high to accuracy requirement occasion is applicable to adopting this pattern.
Beneficial effect:
The utility model novel intelligent pH measure and control device, has following characteristics:
(1) the utility model has the control of PLC ratio and ON/OFF limit control double control pattern (being the function that pH controller carries):
PH ratio control mode is that (pulse Length Proportional Control/ pulse length ratio controls PLC.The feature that ratio controls: pH control accuracy is high, in and the speed of pH solution.And PFC full name is the control of Pulse Frequency Proportional Control/ pulsed frequency ratio.
In addition, at Chinese industrial pH control field, as waterworks, the fluid filling pump of more use is the electromagnetic diaphragmpump of band stroke, mostly uses hard tube to connect between equipment, and due to peristaltic pump tube be flexible pipe, resistance toly to force down, use peristaltic pump to be inappropriate, therefore, most of engineering technical personnel do not know peristaltic pump, and at small-sized pH measurement and control area, there is no the product based on peristaltic pump, even if having, also just adopt simple limit ON/OFF control.
Although the limit ON/OFF control method of pH is simple a kind of control method, under special circumstances, user also can operating limit ON/OFF control pattern.Therefore, the utility model supports pattern of double controlling, compatible and dirigibility is good.
(2) control accuracy of the present utility model is high.Owing to adopting PLC impulse ratio to control, control accuracy can control higher than the limit far away, and therefore, control accuracy of the present utility model is that the existing limit controls not stand comparison.
(3) two fluid filling pumps are contact-carrying start and stop and the mini peristaltic pump of OLED (Organic Light Emitting Diode) digital display with positive/negative turn and digital knob speed-regulating function
(4) digital speed governing has following features, rotary knob install beforehand speed, and push-turn key is full speed running then, unclamps knob and then gets back to again original preset speed.Digital display screen then shows rotating speed, positive/negative turn, the symbols such as time-out.
The fluid filling pump of small-sized pH automaton adopts peristaltic pump, for peristaltic pump, before work, need in advance by the acid in peristaltic pump flexible pipe one insertion bottle or alkali lye, after other end connects the inlet of reactor, require that peristaltic pump can rotate forward fast, to guarantee that pump hose is all full of acid or alkali lye and can not has bubble in pipe, after end-of-job, require that peristaltic pump can reverse fast, acid or alkali lye in pump hose are recovered to rapidly in acid and alkali bottle, also the quick rotating function utilizing peristaltic pump is needed with the residue of the acid in clear water thorough scavenging pump flexible pipe or alkali lye.User also can easily from the rotating speed observed OLED display screen and positive/negative turn and halted state.The peristaltic pump of " advanced digital speed governing " function that the utility model device adopts is selected for the above-mentioned operation requirements for peristaltic pump specially, and highlight function user-friendly for operation more, user uses more convenient! Peristaltic pump major function is only the use of liquid feeding, but I Let meter arrange peristaltic pump to have above-mentioned auxiliary operating function. also belong to pioneering at home and abroad.
(5) small-sized pH real-time data acquisition and a curvilinear recorder being with blue look LCD display is had in the utility model device, the utility model device intactly can be recorded from the real-time PH data acquisition/change curve of starting working to terminating and can be backed up in USB flash disk, simultaneously also by RS232 communication interface, Real Time Observation pH change curve on computing machine giant-screen is also preserved, the pH data gathered then can Excel file form be preserved, and provide important science data to numerous scientific research personnel.
(6) one machine dual-purposes, require pH controller and two fluid filling pumps with " interlock " or " Off hook " have two kinds of mode of operations, two peristaltic pumps after Off ditch will not accept the control of pH controller, two pumps now separately can be used as him, in addition, as as described in above 2nd, before the utility model device busy, peristaltic pump needs to do a little preliminary work, and pH controller also needs do pH correction and parameters adjustment and arrange, and these all can carry out under Off ditch pattern, each tune is each, ten do not disturb mutually, before starting working, mode of operation need only be can switch to and link.
In sum, the utility model compact conformation, integrated level is high, powerful, and control accuracy is high.Be adapted to the preparation of the specific pH solution of vast laboratory scientific research personnel's tissue cultures, teaching; PH regulable control liquid feeding in biochemical-pharmaceutical factory, industry environmental protection, Electroplate Factory or pilot plant, retort, reactor, reactor; Plant extracts workshop, bio-reactor and fermentation plant, the application in the fields such as the preparation of pH damping fluid and incubation regulable control, new product development.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of intelligent pH TT&C system;
Fig. 2 is the wiring schematic diagram of intelligent pH TT&C system.
Embodiment
Below with reference to the drawings and specific embodiments, the utility model is described in further details:
Embodiment 1:
As Fig. 1-2, the utility model device has three compound pH combination electrodes of three functional modules and band PT100 temperature compensation to form;
General structure: length, width and height 30CM X24CMX36CM desktop apparatus; Three functional modules are respectively:
1. a pH1000 controller, user more uses pH control model for PLC (control of pulse Length Proportional Control/ pulse length ratio) is to realize in fast speed and pH solution and higher pH control accuracy at this device.
This controller is also containing limit ON/OFF control pattern, under special circumstances, if user needs fast and pH solution, and do not emphasize control accuracy, as being used in pH solution ratio occasion, or tutor directs study and gives birth to or student, understand or be familiar with, when two kinds of different control methods that compared proportions controls and the limit controls, understand or the pH neutralization solution of more complicated and the overall process of control accuracy, the pH change of this overall process can at pH display screen or visual on computer screen, pH display screen or on computer screen by display real-time pH change curve trend and preserve, the data acquisition of pH is then preserved with Excel form.
2. two band OLED digital display screens, can positive/negative turn, the senior mini peristaltic pump (high segmentation step motor) of digital speed governing knob
SP-Minipump (mini peristaltic pump) technical indicator
The range of speeds: 0.1 ~ 300rpm, rotating is reversible
Velocity resolution: 0.1rpm;
Mode of speed regulation: digital knob speed governing, has preset speed, presses digital knob, then digital knob is unclamped in full speed running, then run by preset speed immediately
OLED digital display screen: display rotating speed, positive/negative turn and time-out symbol
Be suitable for power supply: 24V direct supply
Consumed power: < 15W
This device has comprised the silicone tube through platinum coated of three kinds of specifications/each 2 meters, and user's flow range as required can select the pump line of three kinds of internal diameters easily:
The flow range that during peristaltic pump velocity range 0.1 to 300rpm, three kinds of internal diameter pipes are corresponding:
14# manages, internal diameter 1.6mm flow range 0.01 to 33.88ml.
16# manages, internal diameter 3.1mm flow range 0.039 to 114.3ml.
25# manages, internal diameter 4.8mm flow range 0.06 to 190ml.3. one has the PH data acquisition/real-time curve trend recorder of 128*64 dot matrix blue screen liquid crystal display (LCD), this register comprises corresponding upper computer software with the RS232 communication interface be connected with computing machine, lower panels has USB flash disk socket, historical data collection/curvilinear trend figure can be saved on USB flash disk.
Refer to accompanying drawing 1.
PH value in the reactor of surveying is sent on pH controller by leaching pH sensor in the solution, and show above display screen, the below of screen then shows 25 degree instead of actual temperature, its purpose is reminding user, top display pH value be by PT100 temperature sensor device by the actual temperature auto-compensation (A TC Automatic temperature compensation) in solution to the pH value in the mark Huaihe River pH value of 25 degree instead of solution.
The control of pH controller exports two tunnels, two peristaltic pumps are controlled by the closing of contact of two relays or disconnection (switching signal), two relays are Yaoed Let by user Gen in pH controller according to Xu and are put and specify, L/L is lower limit relay, it is upper limit relay that control is added alkali pump H/H by this relay, control is added alkali pump by this relay, A1 and B1 represents lower limit relay and upper limit relay contact switch respectively, requirement due to the startup mouth of these two peristaltic pumps is that open circuit is for starting, close as stopping, therefore the output A1 of the contact switch of two relays of controller and B1 wiring are connected on normally closed contact, .A2 and B2 represents the start and stop port adding alkali pump and acid adding pump respectively, D is " interlock " or " Off hook " toggle switch, " interlock " position time, the start and stop adding alkali pump control via lower limit relay A1 → D → A2, the start and stop of acid adding pump control via upper limit relay B1 → D → B2, when lower limit relay contact is for open circuit, starts and add alkali pump, when upper limit relay contact is for open circuit, start acid adding pump.When toggle switch is " unhook " time, because toggle switch has interrupted the control channel of A1 → D → A2 and B1 → D → B2, the startup mouth of two peristaltic pumps now is all in open-circuit condition, when the hook-shaped state of Off, two peristaltic pumps will not receive the steering order of pH controller, and two peristaltic pumps can independent operating.The utility model adds one dexterously in line design " Off hook " or " interlock " toggle switch, to reach above-mentioned functions, also belong to pioneering at home and abroad.
Before the use, after toggle switch must being allocated to Off hook position, need the Huaihe River before parameters being set respectively on pH controller and using peristaltic pump to make good berth standby.Operating process is described as follows:
1. on pH controller, select PLC control mode, and two important parameters of PLC need be set, pulse length time T (0.5 to 20 second adjustable) is namely set, Set scale band %Prp (10 to 200 is adjustable).
Setting SP1 is on the controller that to set SP2 be the upper limit pH value (control acid adding pump) that need control to the lower limit pH value (control adds alkali pump) that need control.
It is 4-20MA that pH controller arranges change power transmission stream, and needing in addition to arrange the PH range ability that need record, is 20MA if corresponding 4pH is 4MA, 8pH, and register will gather the data of pH and show pH real-time curve within the scope of record 4-8pH.The change power transmission stream C1 of pH controller is connected to the 4-20MA input end C2 of PH data acquisition/real-time curve trend recorder.
If user wishes to observe on giant-screen, can by pH data acquisition/real-time curve trend recorder with RS232 telecommunication cable connect below RS-232 interface to notebook computer interface.
2. on pH register, press power switch
A). at pH register " system " Let puts pH range ability corresponding to 4-20MA in menu, this pH range ability must be consistent with the pH range ability that user sets at pH controller.
B). select sampling rate, 1/2/4/8/12/24/36/60/120/180/240 second is optional.
3. operate two peristaltic pumps, will acid be connected or alkali lye bottle to the flexible pipe of reactor is filled, preset peristaltic pump speed.
A) by toggle switch from " unhook " be allocated to " interlock " position.
Start pH observing and controlling:
PH controller screen will show real-time pH data, on computers also by simultaneous display pH real-time change curve.
If pH sensor measurement to container in pH value lower than SP1 setting value, lower limit relay contact A1 is open circuit, the on off control end A2 adding alkali pump is also open circuit, add alkali pump to start, time initial, the pH value of solution is away from S P1 setting value, add alkali pump will constant speed (constant current) run at a relatively high speed, pH value in container rises quickly, when close to SP1 value, enter the proportional region of PLC, now, alkali lye will successively decrease gradually, the ascending velocity of the pH value in solution also will more and more slowly close to SP1, when arriving SP1, alkali lye is 0, transfer the promptly constant pH value at SP1, carry out precise hard_drawn tuhes, if the pH value in like manner in solution is higher than SP2, by B1 to B2, start acid adding pump, pH value in solution will reduce quickly ... ...
This be one complete by pH sensor, pH controller, the process of the PLC closed-loop control (negative feedback) that fluid filling pump is formed.
It should be noted that, because the utility model device is applicable to the reactor not of uniform size that 500ML to 80 rises scope, as a rule, for little reactor, the % of proportional band can select smaller, the time of pulse length also can arrange smaller, and for large reactor, owing to there being large lag-effect, the % of proportional band can select larger, the time of pulse length also can arrange larger, and the pH value in neutralization solution is nonlinear, a very complicated process, except the above, companion's speed of stirring in the initial velocity of pump preset and reactor is also one and must considers, want the pH change curve of the desirable neutralization solution of acquisition and control smart heptan, have to pass through and repeatedly debug.
PH change procedure described above also the LCD small display in pH data recorder will show the change curve of a real-time pH, after observing and controlling completes, data can be examined shellfish to USB flash disk by user, again USB flash disk is inserted computer, now on computer, display is pH historical data and history pH change curve, as previously mentioned, when pH data recorder and computer real-time Communication for Power, also simultaneous display real-time pH change curve on computer.The aftertreatment of these data does not describe at this.
The utility model adopts band digital display, just/turning, the mini peristaltic pump of digital speed governing knob, the operating function of its advanced person represents feature user-friendly for operation.
The little cabinet of pH register is both removable, and also can build up one with below cabinet, represent feature user-friendly for operation, the feature of this equipment is as follows:
1. volume is little, stackable, separable, can be made up of the cabinet of two length, width and height 30X24x10CM and 30X24x26CM, stackable, separable
2. the equal accessible site of all functions device on the control panel, easy to use.
3. realize feature user-friendly for operation more easily
If the pH value of the solution at that time in reactor is 0.5, and the pH value that the need of SP1 setting control is 7pH, PLC has two parameters to need to select, a parameter is proportional band, as can be seen from Figure, when proportional band is 30%, when just starting, peristaltic pump incites somebody to action constant-speed operation at a relatively high speed, the flux of alkaline liquor now adding reactor also adds reactor with higher constant rate, neutralization solution at a relatively high speed, when the pH value of solution rises to 3.5pH, start to enter proportional band, now caustic dosage will successively decrease gradually, 7pH reference mark is arrived when fast, by with the add alkaline methods of 11, carefully close, when arriving during pH, caustic dosage also youngster is close to 0.
The advantage of this control method of PLC is fast with speed in solution, and control accuracy is high, and limit ON/OFF control mode advantage is that in solution, kind speed is fast, and shortcoming is that control accuracy is poor.
The utility model device is mainly used in the research staff in laboratory, by to various small chemical, the pH measurement of the solution in bio-reactor etc. and the testing requirements of control, user can after the pH value of the required control of fixed 1 point (SP1 or SP2) of Let or 2 points (as SP1 and SP2) Shang the menu of the senior pH controller of native system device, this pH controller can according to the actual measurement of pH probe to pH value and the setting value of SP1 or SP2 compare, automatic decision and drive on this device mini acid adding or add alkali pump and with PLC ratio control mode, acid or alkali lye are added in reactor, neutralize original pH solution quickly, until the solution in reactor arrives pH Yu Let value SP1 or SP2, and in the pre-Let value of pH, carry out fine setting control all the time, control accuracy is high, and the real-time PH data acquisition/change curve register of overall process provides a collection of important scientific experimentation data and change curve to research staff, the pH data gathered are preserved with Excel file form.
This senior pH controller also has limit ON/OFF control mode, and these two kinds of control modes can be selected easily by button.
Adopt the flow range of mini wriggling to be 0.01 to 190ml, the observing and controlling needs that 500ml to 80 rises the reactor of left and right can be met.If the course of work of whole reactor only needs add alkali or only need acid adding, also can arrange a point and control two pumps simultaneously, flow range now, by expansion 2 times, is 0.02 to 380mI.Such as, user needs reference mark to be arranged on 8.00pH, and in use only need to add alkali lye, user can on pH controller panel, choice menus, SP1 and SP2 Let is set to 8.00pH, SP1 and SP2 is all set to L/L, otherwise, if user needs reference mark to be arranged on 8.00pH, and in use only need acid liquid, S P1 and SP2 all can be set to H/H.
Claims (5)
1. a novel intelligent pH measure and control device, is characterized in that, comprises pH controller, change-over switch, acid adding pump, adds alkali pump, acid adding pump junction block, adds alkali pump junction block and pH combination electrode; Also comprise pH real-time data acquisition and curvilinear recorder;
PH controller adopts U.S. alpha pH1000 type controller, is integrated with lower limit relay, upper limit relay and 4-20mA current transducer;
Acid adding pump junction block, add alkali pump junction block and all adopt direct current 24V to power;
Be integrated with 2 handover modules in change-over switch, the lead-out terminal of a side joint lower limit relay of first handover module, opposite side is connected with 2 control terminals added on alkali pump junction block, and these 2 control terminals connect 2 feeder ears of plus-minus pump;
The side of second handover module connects the lead-out terminal of limit relay, and opposite side is connected with 2 control terminals on acid adding pump junction block, and these 2 control terminals connect 2 feeder ears of acid adding pump;
Described acid adding pump and add alkali pump and be peristaltic pump;
Add alkali pump for the alkali lye in alkali bottle is injected reaction vessel; Acid adding pump is used for the acid solution stored in demijohn to inject reaction vessel; PH combination electrode is placed in reaction vessel for the current pH value of detection reaction liquid in containers;
PH combination electrode is connected with the signal input part of pH controller;
The output termination pH real-time data acquisition of the 4-20mA current transducer of pH controller and curvilinear recorder.
2. novel intelligent pH measure and control device according to claim 1, is characterized in that, pH combination electrode is the pH combination electrode with pT100 temperature compensation.
3. novel intelligent pH measure and control device according to claim 2, is characterized in that, pH real-time data acquisition and curvilinear recorder have the serial line interface communicated with host computer.
4. novel intelligent pH measure and control device according to claim 3, is characterized in that, pH real-time data acquisition and curvilinear recorder are provided with the USB interface for connecting USB flash disk.
5. the novel intelligent pH measure and control device according to any one of claim 1-4, is characterized in that, the supply side adding alkali pump and acid adding pump is all parallel with a pump operation status surveillance branch road; Described pump operation status surveillance props up routing resistance and Diode series forms.
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| CN201420406067.0U CN204065855U (en) | 2014-07-22 | 2014-07-22 | A kind of novel intelligent pH measure and control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116936A (en) * | 2015-07-15 | 2015-12-02 | 中国水产科学研究院黄海水产研究所 | pH running water control system and method |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116936A (en) * | 2015-07-15 | 2015-12-02 | 中国水产科学研究院黄海水产研究所 | pH running water control system and method |
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