Summary
Objective: To study the RET control-visc heating magnetic stirrer with 2pt (Two-point mode), fPID (Fast PID mode) and aPID (Accuracy PID mode). The three different temperature control modes control the accuracy and effect of the sample temperature test, and verify the accuracy and stability of the RET control-visc heating magnetic stirrer in the PID control technology. Methods The external temperature probe PT100 was used to control the temperature control of three different temperature control modes at different temperatures in water, 50mPas silicone oil and 500mPas silicone oil. Results The temperature rising rate of 2pt temperature control mode is fast, but the temperature is large and the stability deviation is large. The heating rate of aPID is slow, but the temperature is small and has high precision stability. The heating rate of fPID and temperature are 2pt and aPID. It also has the advantage of high precision stability. Conclusion, different temperature control modes can meet the needs of different users, and users can have high selectivity, which is very helpful in practical applications.
1. Keyword PID Interpretation:
PID (P proportional-I integral-D differential) control - consists of proportional unit P, integral unit I and differential unit D. The PID control absorbs the fast response function of proportional control, the elimination residual function of integral control and the prediction of differential control. Function, from the control effect, this is an ideal temperature control method. Although the performance of the PID three-acting controller is ideal, it is not possible to use the PID three-acting controller under any circumstances. Because the PID three-action controller needs three variables of scaling Kp, integration time Ki and differential time Kd, the temperature characteristics of different media are different, the PID parameters are set differently, and the ratios, integrals, and differentials are adjusted. The parameters have different effects on the heating rate, temperature, stability, relative error, stability and other performance indicators, so it is difficult to set these three variables to the optimal value in practical application [1]. For this purpose, IKA has developed two PID temperature control modes with PID parameter self-tuning function. The automatic adjustment of parameters is realized by intelligent adjustment or self-correction and adaptive algorithm, which is beneficial to control media with different temperature characteristics. It achieves the optimal temperature control effect. Below we will analyze the world's top heating magnetic stirrer - how RET control-visc uses high precision control PID technology to achieve the ideal temperature control effect.2. Experimental part
2.1 Instrument and reagent heating magnetic stirrer (RET control-visc)
PT100 temperature sensor (IKA? PT 100.50)
30mm cylindrical magnetic stirrer (IKAFLON? 30)
Labworldsoft? software (IKA labworldsoft?)
Data acquisition instrument (Ahlborn Almemo? 2690)
PT100-1 temperature probe (Ahlborn FPA32P)
1000mL low beaker (SCHOTT DURAN)
Water (general tap water)
Silicone oil (50mPas)
Silicone oil (500mPas)
2.2 Experimental method Measure 800mL water / 50mPas silicone oil / 500mPas silicone oil in a 1000mL low-profile beaker, put a 30mm stirrer, and then place the beaker in the center of the RET control-visc heating magnetic stirrer, connect the external temperature of RET control-visc The sensor PT100 is temperature-controlled. The temperature probe is placed 10mm away from the beaker wall and 20mm from the bottom of the cup. Then the external Alhborn temperature probe PT100-1 is placed close to the RET control-visc heating magnetic stirrer PT100, and the labworldsoft software is connected to the sample. Temperature changes are recorded in real time. The magnetic stirrer was separately set and tested according to the experimental conditions in Table 1.
3. Results and discussion
3.1 Test chart of 800 mL water in a 1000 mL beaker:
Calculation results:
3.3 800mL 500mPas silicone oil test chart in 1000mL beaker:
3.4 Experimental results The above experiments show that in 1000ml beakers, 800ml three different viscosity media are used as the carrier for temperature control test, and three different temperature control modes can achieve different purposes of temperature control. Therefore, it is possible to simply summarize the temperature control characteristics of the three temperature control modes: 2pt heating rate is the fastest, temperature is the highest, and stability is the worst; aPID heating rate is the slowest, the temperature is the smallest, and the stability is the best; The fPID is basically between 2pt and aPID.
4. Conclusion The latest generation of RET control-visc heating magnetic stirrer can achieve good, accurate and stable temperature control effects for different media and different set temperatures. Even high viscosity samples are very effective. And RET control-visc offers three different temperature control modes for the user to choose from:
If the user is not so sensitive to the media temperature control requirements, just need to quickly reach the set temperature, then you can choose the 2pt temperature control mode;
If the user is very strict with the temperature requirements of the medium, and needs to be as cold as possible, stable, and accurate temperature control, then you can choose aPID temperature control mode.
If the user allows a little warming, but wants to have a good temperature control effect and a fast heating rate, then you can choose the fPID temperature control mode.
Different temperature control modes to meet different needs, RET control-visc heating magnetic stirrer is an ideal and wise choice for pharmaceutical, biochemical, biological and chemical applications.
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