Low temperature thermostats are widely used in research departments such as petroleum, chemical industry, electronic instruments, physics, chemistry, bioengineering, medicine and health, life sciences, light industrial food, physical property testing and chemical analysis, universities, enterprise quality inspection and production departments Provide a field source with controlled heating and cooling, uniform temperature and constant temperature for the user's work. Constant temperature test or test on the test sample or product produced can also be used as the heat or cold source for direct heating or cooling and auxiliary heating or cooling.
Product description of low temperature thermostat:
The low-temperature constant temperature bath is a high-precision constant temperature source with refrigeration and heating. It can be used for constant temperature experiments in the water tank inside the machine, or connected with other equipment through a hose to be used as a constant temperature source. It is widely used in research departments such as petroleum, chemical industry, electronic instruments, physics, chemistry, biological engineering, medicine and health, life science, light industry food, physical property testing and chemical analysis, colleges and universities, enterprise quality inspection and production departments, working for users It provides a cold and controlled field source with uniform temperature and constant temperature. It can conduct constant temperature test or test on the test samples or products produced, and can also be used as a heat or cold source for direct heating or cooling and auxiliary heating or cooling.
Main features of cryostat:
â— Fully enclosed imported refrigeration compressor, fluorine-free refrigeration system and multiple protection devices such as overheating, overcurrent, and overpressure.
â— With internal and external circulation, the circulation pump can lead the medium in the tank to establish a second constant temperature field, which can play the role of cooling or constant temperature of the experimental container.
â— The low-temperature constant temperature bath adopts the latest-generation imported automatic PID temperature setting program and imported temperature sensor, which has high temperature control accuracy.
â— High-precision temperature control technology plus patented U-type double-circulation system to improve temperature uniformity.
â— Large screen LCD display in Chinese and English, clear data, beautiful appearance, personalized interface makes industrial control no longer monotonous.
â— The body of the vertical low-temperature constant temperature bath adopts mirror surface anti-aging electrostatic painting technology, and the inner tabletop is made of high-quality S304 stainless steel, which is clean, hygienic, beautiful and corrosion-resistant.
â— Drain valve is provided on the side to facilitate medium replacement.
â— Built-in multiple equipment protection devices:
1. Over-temperature protection device, buzzer alarm
2. The whole machine has power-off protection function
3. With low water level protection and buzzer alarm function, to prevent the medium in the tank from drying out and cause machine failure and heating pipe explosion-proof function
Compressor is one of the important components in the cryostat. Its working principle is mainly based on the relationship between pressure volume and temperature in physics. When the mass of gas is constant, the product of pressure and volume is a constant. Therefore, to double the pressure of gas per unit mass, its volume must be reduced by half. All cryogenic thermostat compressors are based on this principle of gas compression.
In general, there are several physical ways to achieve gas compression:
The relatively static gas compression volume changes and the flowing gas diameter changes.
1. The relatively static gas volume changes. Such as live racing compressors, rolling rotor compressors, screw compressors, etc.
2. The diameter of flowing gas changes, such as scroll compressor and jet compressor. Such as fully enclosed compressor unit refrigeration, the refrigeration system has multiple protection devices for overheating and overcurrent
Low temperature thermostat structure and classification:
â’ˆVertical low temperature thermostat (see picture)
â’‰Horizontal low temperature thermostat (see picture)
The shell is made of metal plate, and the control box is directly installed on the water tank. There are two condensate pipes in and out of the water nozzle, and the imported high-quality water pump is used as the circulating power in the water tank, which solves the disadvantages of uneven temperature water, so that the temperature control accuracy of the instrument and the uniformity of water can meet higher requirements. This product can be circulated internally and externally, and the two inlet and outlet pipes can be used as internal circulation by connecting the latex pipe. Remove the latex pipe and connect the two water pipes to the inlet and outlet of the reactor respectively to form an external circulation, which is close to the control panel. Only the copper water pipe is the water outlet pipe connected to the pump, and the other is the water inlet pipe. Please pay attention not to make a wrong connection when connecting to avoid backflow of water when starting up.
Low temperature thermostat components and internal operation principle:
1. Low temperature thermostat parts: compressor, condenser, evaporator, fan (inside and outside) circulating water pump, stainless steel liner, heating tube, intelligent temperature control meter.
2. The internal operating principle of the low-temperature tank: after the compressor is operated, it will be vaporized by suction-compression-exhaust-condensation-throttling-and then low-temperature evaporation to absorb heat. The water temperature will be reduced to the temperature set by the temperature control table, such as temperature control The table setting temperature is higher than normal temperature. The contactor in the temperature control meter works automatically, giving the heating tube a current signal, and the heating tube starts to work when working in the low temperature thermostat. The inlet and outlet of the whole machine can be used for internal circulation or external circulation of the internal water source, and the internal water source can also be led out. Do the second constant temperature field outside the cryostat.
How to use the cryostat:
This instrument uses 220V AC power, please make sure that the rated current of the power socket is not less than 10A before use, and it has a safety grounding device (please connect the grounding device to the working room when using it). When adding water, please note that it is not less than 8cm away from the upper cover. Soft water must be used, preferably distilled water. Do not use well water, river water, spring water or other hard water to prevent the heating tube from bursting and affecting the temperature sensitivity. Please use it correctly according to the temperature control instrument manual, set the required temperature value>
First turn on the power, set the required temperature value on the meter according to the instructions, and when the temperature reaches the set temperature, you can turn on the cycle switch, so that all programs enter the normal working state.
Precautions for the use of cryostat:
1. Add the liquid medium into the front tank of the low temperature thermostat, the liquid level of the medium should be about 30mm lower than the worktable, otherwise the heater will be damaged when energized;
2. The selection of the liquid medium in the low-temperature constant temperature bath should meet the following principles:
When the working temperature is 5 ~ 85 ℃, the liquid medium generally uses water;
When the working temperature is 85 ~ 95 ℃, the liquid medium can choose 15% glycerin aqueous solution;
When the working temperature is higher than 95 ° C, the liquid medium generally uses oil, and the open cup flash point of the selected oil should be higher than the working temperature by more than 50 ° C;
3. Power supply: 220V50Hz, the power supply should be greater than the total power of the instrument, the power supply must have a good "ground" device;
4. The instrument should be placed in a dry and ventilated place with no obstacles within 300mm around the instrument;
5. When the working temperature of the constant temperature bath is high, you should be careful not to open the upper cover and do not enter your hand with the hand to prevent burns;
6. After use, all switches are turned off to cut off the power supply;
The instrument should do regular cleaning work to keep the work surface and operation panel clean;
Always pay attention to observe the liquid level in the tank. When the liquid level is too low, the liquid medium should be added in time; considering the safety factors, we stipulate that the constant temperature tank above 100 ℃ is made into an internal circulation. If the external circulation is changed according to the customer's requirements, the customer should pay special attention to the firmness of the connection of the outlet pipe to prevent it from falling off to avoid burns.
Technical parameters of cryostat:
â— The following are optional functions of low temperature thermostat
1. Optional communication interface to synchronize operation with PC.
2. Optional built-in 1 ~ 30 segment program for temperature control, automatic program temperature control, real-time display of set temperature and time program running status
3. Optional external temperature sensor function can be configured to achieve internal and external temperature settings, which can monitor and control the temperature of the external device system during external circulation.
4. The cooling coil inside the tank can be re-arranged to control the exothermic reaction of the reaction tank.
5. The magnetic stirring function can be designed and installed without the need for an external vertical mixer. The operation is simple and convenient, and the stirring reaction at fully enclosed constant temperature can be achieved.
6. Casters can be added according to customer requirements, easy to disassemble
6. Accept the customization of products of various sizes and specifications or special requirements
Treatment of common problems of cryostat:
1. The water cycle is normal for more than a year, but now the cooling rate seems to be slower and slower, the more obvious it is when the temperature is higher?
Answer: Water recycling is very simple, but regular maintenance work cannot be ignored. There are many seemingly faulty problems that are caused by failure to do regular maintenance. The electrical power of the water cycle and the heat taken by the refrigerant from the load need to be removed from the radiator at the front vent hood. If the front vent hood is full of dust and willow cotton, etc. will hinder the dissipation of this heat, and the cooling effect Great discount. Generally speaking, the decrease in cooling capacity under normal use conditions is caused by poor ventilation and heat dissipation or high ambient temperature.
2. The water cycle was used normally in the past, but now the noise is much louder than before, what is the reason?
Answer: I mentioned the routine maintenance of the water cycle before, and this issue is also related to it. Everyone knows that there are very few impurities in the water. Even if distilled water is added to the water tank, it is impossible to guarantee that there is no impurity at all. For the water cycle, the general temperature is set at 20 ℃, especially adapted to the growth and reproduction of microorganisms. After a long time, these microorganisms will block the filter of the waterway and cause the backwater to be poor, and the pump will have a loud noise. Sometimes these microorganisms are attached to the surface of the heat exchanger, causing the heat transfer effect of the heat exchanger to deteriorate and the cooling capacity to become smaller. Therefore, the daily maintenance work must be done in strict accordance with the requirements in the manual, the inner tank should be cleaned regularly, and the tank should be kept dry for a long time. There seems to be water leakage in the water circulation, and sometimes there will be a few drops on the ground. Is there a leak on the waterway? Generally speaking, during normal use, there will be no leakage on the waterway. When the relative humidity in the air is relatively high and the relative humidity in the air is too large, dew condensation is easy to condense at the water pump, water pipe joints, and external water pipes in the water circulation circuit. After accumulating, it will drip onto the ground. Leaking place. If you care about this, turning on the air conditioner to lower the room temperature or dehumidifying can avoid dew.
Daily maintenance of cryostat:
1. The liquid medium must be added into the cryostat before use, otherwise the heater will be damaged when the power is turned on, and the medium liquid level should be about 30mm below the worktable.
2. The selection of the liquid medium in the cryostatic bath should meet the following principles:
a. When the working temperature is 5 ～ 85 ℃, the liquid medium is generally water;
b. When the working temperature is 85 ~ 95 ℃, the liquid medium can choose 15% glycerin aqueous solution;
c. When the working temperature is lower than 5 ℃, the liquid medium generally uses alcohol or freezing liquid.
3. After the refrigeration switch of the cryostat bath is turned off, the refrigeration switch should be turned on again for 10 ~ 20 minutes (depending on the ambient temperature).
4. Low temperature thermostat power supply: 220V50Hz, the power supply should be greater than the total power of the instrument, the power supply must have a good "ground" device.
5. The low-temperature constant-temperature bath should be placed in a dry and ventilated place with no obstacles within 300mm around the instrument. When the working temperature of the low-temperature constant temperature bath is low, care should be taken not to enter the bath to prevent frostbite. After use, all switches are turned off to cut off the power. The low temperature thermostat should do regular cleaning work to keep the work surface and operation panel clean.
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