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Technical Features of Lattice's Precision Programmable Hot Air Circulation Oven
Author: Li Guoxing Abstract: Introduction to the technical characteristics of several aspects of Australia Lead-tech programmable hot air circulation oven, hope this article will give the user some precision programmable hot air circulation oven basic knowledge and be able to oven for Australia Lead-tech has A comprehensive understanding.
Foreword
The precision programmable hot air circulation oven is an electric blast drying oven, also known as a drying box or oven. It is mainly used in chemical, building materials, food, medicine, colleges, scientific research units and biochemical industries. It is non-flammable and explosive. And drying, baking, heat treatment, melting wax and disinfection of non-volatile materials. For example, in the field of agriculture: electric drying ovens can reduce the moisture in agricultural by-products to the standard of safe storage, and also the processing of many agricultural and sideline products. Dried agricultural by-products can reduce the quality degradation caused by bacteria, germs and pests, and by drying, the storage time can be extended. Since the dry product is light in weight, small in size, easy to package, transport, store, circulate and sell, the cost is reduced, and the dried product is also easy to be pulverized and mixed. In the pharmaceutical industry: The electric drying oven is suitable for dry heat sterilization of pharmaceutical packaging equipment such as aluminum bottles and glass bottles. Due to the good killing effect of dry heat sterilization on spores, it has been widely used in the pharmaceutical industry.
1. Precision programmable hot air circulation oven features:
The constant temperature adjustment range of the drying oven is generally in the range of RT+5°C~300°C. Environmental requirements: temperature (5 ~ 35) ° C, humidity ≤ 85% RH, no strong vibration around, no corrosive gases and flammable and explosive gases.
Electric drying oven features:
(1) Small heat loss and high drying efficiency; F.CWGS wind guide structure: The centrifugal fan is used to forcefully change the direction of the internal airflow, and the air-conducting air hole in the inner wall of the tank forms a forced hot air circulation convection in the inner tank, which is more effective guarantee The temperature uniformity in the tank, the heating rate block, and the drying efficiency are high.
(2) Large volume, maximum volume up to 700L; complete specifications and models, with 23L, 60L, 120L, 220L, 450L, 700L, six different volume models, convenient for user selection.
(3) The temperature can be automatically controlled, and the controller can perform self-tuning.
(4) Large rounded stainless steel inner tank design (effectively reduce dirt residue and microbial growth on the inner wall, convenient for users to clean and maintain the equipment daily).
(5) LCD liquid crystal display panel, display device parameters, operation process, alarm information, etc.
(6) Programmable program design: 10 segments and 999 cycles, timing range: 0~99 hours and 59 minutes.
(7) DSA double safety early warning system: The equipment is equipped with electronic safety early warning device and independent temperature limiting device (sensor fault alarm, over temperature alarm, overload alarm).
(8) With RS-485 interface, it can be connected to computer and recorder.
(9) The equipment is equipped with an independent electric damper switch, which is convenient for the experimenter to control the air volume in real time.
(10) It has a reservation function and can be started according to the time set by the user;
(11) The fan is an EBM fan, and the 10th speed is adjusted, which can be programmed. (This is for forced convection drying ovens).
2. Precision programmable hot air circulation oven structure:
The electric drying oven mainly comprises a box body, a temperature control part and a heating part.
2.1 box part
Adopting streamline arc design, the shell is made of cold-rolled steel plate, the surface is electrostatically sprayed; the inner tank is made of mirror stainless steel material; the working room shelf can be adjusted according to the user's requirements to adjust the height and the number of shelves; using EBM fan ( 10 wind speed adjustment), trace air circulation, is conducive to drying small or powder related items and make the temperature inside the box more uniform, and at the same time accelerate the evaporation of water vapor in the box to the air outside the box to improve drying efficiency; reasonable The air duct and circulation system make the uniformity variation in the working chamber small.
2.2 Temperature control part
The temperature control part is the core part of the electric drying oven, which mainly compares the temperature signal measured by the sensor with the set value. If the measured value of the sensor is lower than the set value, the temperature controller outputs a pulse signal to trigger the conduction of the thyristor control panel, so that the drying box is heated, if it is higher than or equal to the set value. The thyristor stops working and disconnects the heating system. The company's products use PID controllers. The PID controller contains three basic control laws, namely proportional (P), integral (I) and emblem (D) control laws. Each control law plays a different role. They can be applied individually or in combination. The controller adopts the most effective control method for the control object with large hysteresis characteristics. The first anti-integral saturation PID control method is: when there is a deviation between the measured value and the set value, the meter output continues to heat the wire until the measured value is The settings are equal. Because of the role of D, the instrument has advanced adjustment function, which improves the dynamic control of the instrument, shortens the adjustment time, and is displayed by the LCD. The sensor is a commonly used Pt100 and has a switching output. The controller is equipped with an AC contactor and an original switch, a dissolved wire, an alarm lamp, etc. to form a control loop. The AC 220 V is connected to the "normally open" terminal of the AC contactor. The switching coil of the AC contactor is controlled by the switching amount of the temperature controller to achieve the purpose of control.
2.3 heating part
The heating part mainly consists of electric heating wires connected in parallel
3. Fault diagnosis and simple elimination
In daily use, although it has been operated as required, there will still be unexpected failures. In this case, please self-diagnose according to the “Failure Reason Checklistâ€. For some faults that can be eliminated by yourself, you can handle it yourself. For some faults that users cannot solve, please record the model specifications of the equipment, contact the local dealer or our company after the product number to obtain the repair service.
Fault cause checklist
Fault phenomenon
Troubleshooting
Disposal
Sensor failure alarm
·The temperature sensor is abnormal, check the temperature sensor, model PT100
·Get repairs through dealers
Temperature rises below the set value
·Check electric heating tube
·Check solid state relay
·Please contact the dealer or manufacturer if the electric heating tube is damaged.
·Replace solid state relays with dealers or manufacturers
No display on the display
·Check the fuse of the device
·Check if the power switch is powered
·Check if the incoming plug wire has ~220V
· Turn on the power switch
·Replace the fuse
·Close the power supply
4 . Conclusion:
This paper aims to illustrate some of the performance characteristics of the precision programmable hot air circulation oven of Lide Tai (Shanghai) Scientific Instrument Co., Ltd., and provide users with the basis for selecting the oven. Lidetai (Shanghai) Scientific Instrument Co., Ltd. is the design and development of high-end laboratory basic equipment by the advanced design concept and decades of manufacturing management experience of LEAD-TECH in Australia. To provide first-class experimental equipment for the vast number of technology companies, medical institutions, universities and their potential customers. The products are based on Australian technology and are available in both domestic and imported models. The important parts of domestic assembled models are imported, and the price is between domestic and imported. Lidetai (Shanghai) Scientific Instrument Co., Ltd. has independent and perfect after-sales service to minimize the risk of your use, provide you with first-class experimental conditions and environment, and create a perfect career.
appendix:
Precision programmable oven
(natural)
LT-DBX23N
240*290*330
RT+5～300°C
1LCD LCD panel display, internal cavity preheating, 10-stage programming, 999 cycles;
2 independent electric damper switch, shell-inner compartment temperature design;
3 double security warning device;
4 temperature uniformity: ± 1.0 ° C (50 ° C); ± 1.5 ° C (100 ° C);
5 temperature fluctuation: ± 0.1 ° C;
LT-DBX60N
400*375*400
RT+5～300°C
LT-DBX120N
600*417*480
RT+5～300°C
LT-DBX220N
734*500*600
RT+5～300°C
LT-DBX450N
1000*563*800
RT+5～300°C
LT-DBX700N
custom made
RT+5～300°C
Precision programmable hot air circulation oven
(mandatory)
LT-DBX23F
240*290*330
RT+5～300°C
1LCD LCD panel display, internal cavity preheating, 10-stage programming, 999 cycles;
2 independent electric damper switch, shell-inner compartment temperature design;
3 double security warning device;
4 temperature uniformity: ± 0.8 ° C (50 ° C) ± 1.3 ° C (100 ° C);
5 temperature fluctuation: ± 0.1 ° C;
LT-DBX60F
400*375*400
RT+5～300°C
LT-DBX120F
600*417*480
RT+5～300°C
LT-DBX220F
734*500*600
RT+5～300°C
LT-DBX450F
1000*563*800
RT+5～300°C
LT-DBX700F
custom made
RT+5～300°C