Do you really know about ceramic band heaters?

Ceramic band heaters are not made of ordinary mica wire, but of ceramic wire, so the power of the product is 0.5 to 1.5 times higher than that of ordinary products. The heating body is made of imported round silk pottery, which is flexed into a spring and inserted into the ceramic strip. The outer cover is made of stainless steel made in Japan, and the insulation cotton (aluminum silicate fiberboard) is used in the middle to prevent temperature leakage. Ceramic heating ring ceramic strip is a high-frequency ceramic with fast heat transfer, hard and not fragile, high temperature deformation is not easy to aging characteristics.

Ceramic band heaters：

1. Fast heat transfer, uniform heating and stable operation.
2. Ceramic band heaters temperature does not leak, can save electricity, the cover touch hands not hot, work safety.
3. The power of the product is high. The power of the ceramic bar through wire is 0.5~1.5 times higher than that of the ordinary one.
4. European and American high-temperature heating wire, with fast heat dissipation, uniform heating, high temperature stability and other characteristics, can be used for a long time at 600-800 C.
5. The product life is long, because raw materials aging at high temperature is slower, so the product has a long life.
6. In line with the national GB technical requirements. The power deviation is +5% - 10%.
7. Electrical strength: voltage 1500v/50Hz sine alternating voltage test, 1MIN no breakdown phenomenon.

The first condition of Ceramic band heaters forming is the interaction between powder and water hardening, and then the reinforcement of the binder part. A certain time of static has an important impact on the final forming effect. When the mold has a preliminary hardness, according to different types of additional measures to further strengthen the force, such as through heating, vacuum drying, ultraviolet light irradiation and so on. After this process is completed, the mold has a strong hardness, which requires the removal of other powder from the surface and the brush to sweep away most of the surrounding powder. The remaining less powder can be removed by mechanical vibration, microwave vibration, wind blowing in different directions. It has also been reported that molds are immersed in special solvents which can dissolve dispersed powders, but can not dissolve solidified molds to remove excess powders.

For moulds finished with powder, especially for moulds made of gypsum base, Tao Ciji and other absorbent materials. Also need to consider its long-term preservation problem, the common method is to brush a layer of waterproof curing adhesive outside the mold, increase its strength, to prevent weakening due to water absorption. Or the mold can be immersed in a protective polymer, such as epoxy resin, cyanoacrylate, molten paraffin, the final mold can be waterproof, strong, beautiful, not easy to deform and so on.

vsec elec. - ceramic band heaters

what is a ptc heater ?

Many customers don't know what PTC heater is or how PTC heater works, so today we'll give you a brief introduction to PTC heater.

PTC heater is also known as PTC thermistor ceramics, it is a kind of semiconductor functional ceramics with positive temperature coefficient. PTC resistance decreases with the increase of temperature before the transition temperature. The resistance increases significantly with the increase of temperature from the transition temperature to the thermal runaway temperature.

PTC heater has many advantages, such as constant temperature heating, long natural life, energy saving, no open fire, good safety performance, easy regulation of heat and less affected by power supply voltage. Domain.

The PTC heater can be made into various shapes and specifications according to the requirements.

Scope of application:

Heating fan, air conditioning heating, dryer, mosquito killer, motorcycle carburetor, automotive damper door, automotive cold start preheating, electric humidifier, electrical instrument moisture-proof heating plate (plate), massager, thermotherapy device, melt gun, curling hair, hair straightener heating, coffee heater, milk heater, boiling water heater, water heater, steam Beauty, etc.

Production process of PTC heater：

PTC heater refers to the automatic temperature control PTC ceramic heating body, is a special ceramic material. The principle of constant temperature heating of PTC heater is: when PTC heater is energized, because the resistance at room temperature is small, the initial current is large, which can make PTC heater heating up quickly, and lead to the resistance value rapidly increasing into the transition zone. At this time, the current through PTC heater is very small, so that the surface temperature of PTC heater remains constant. The temperature is only related to Curie temperature and applied voltage of PTC heater, but has nothing to do with ambient temperature. The production process of PTC heater is as follows:

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All kinds of PTC thermistors

PTC thermistors for degaussing circuits. Characterized by no contact, no noise, long life. The product is used in the demagnetizing circuit of color CRT. It can effectively demagnetize the magnetized CRT shading board due to the influence of magnetic field and improve the color barrier. Models are: MZ71, MZ72, MZ73, MZ1, MZ2, MZ3, etc.

SMD SMT PTC thermistor. This resistor is flat sheet, suitable for mass production of PCB chip packaging, higher efficiency, low defect rate.

High polymer PTC thermistor. This kind of PTC is often found in PPTC self-recovery fuse, which has the function of over-current and over-heat protection, and can be restored. Under normal conditions, the low resistance state, once the phenomenon of overcurrent occurs, the PPTC thermistor self-heating to increase its impedance to suppress the current to a small enough to protect the secondary circuit.

The PTC heater has the characteristics of constant temperature, temperature regulation and automatic temperature control. It is also safe, reliable and has a long life. When the PTC heater is heated, the resistivity is very low below the Curie point temperature; once the temperature exceeds the Curie point, the resistivity increases sharply, so that the current drops to a stable value, so as to achieve automatic control of temperature, constant temperature and other purposes. Widely used in tea disinfection cabinet, coffee machine, chocolate machine, electric mosquito repellent, thermostat, physiotherapy, heater and other electrical appliances.

PTC thermistors are started by motors and motors. This kind of resistance is usually found in disc structure of optical sheet. It is more suitable for clamping contact mode and more suitable for single-phase induction motor. The PTC motor starter is one of the most important components for motor startup.

Power type PTC thermistor. Usually PTC thermistors are connected in series in the power supply circuit. Normally, the current flowing through the PTC is less than the rated current, and the resistance value is very small. When the circuit current greatly exceeds the rated current, the PTC suddenly heats, the resistance value suddenly increases to the high resistance state, thus limiting or blocking the current, and protecting the back circuit from damage.

DS18B20 temperature sensor waterproof test

Hello everyone.

Today we show you our waterproof DS18B20 temperature sensor.

The following is a very simple waterproof test to verify that the waterproof DS18B20 works properly underwater.

Firstof all we have to prepare a Vsec waterproof DS18B20 temperature sensorand a single chip microcomputer, of course, also need a glass of water.

Thenwe link the DS18B20 temperature sensor to the microcontroller, andfinally put the DS18B20 temperature sensor into the prepared water.

From the above picture we can see, in fact, the waterproof DS18B20 temperature sensor and ordinary DS18B20 temperature sensor in use is no difference, the difference is only waterproof.

DS18B20 temperature sensor waterproof test

Advantages of ptc fan heater

1.What is ptc heater?

ptc heater is a positive temperature coefficient thermistor. It is a ceramic heating element. Characterized by a certain operating temperature range, its resistance value increases sharply with the increase of temperature, and can be stabilized in a certain operating temperature range.

2. Advantages of ptc fan heater

The ptc fan heater is extremely safe because when the working temperature of the ptc heater reaches Curie point, its resistance value increases sharply with the temperature rising, forcing the output power to drop rapidly. When the fan stops running and there is no air-dry burning, the maximum temperature of the internal parts of the machine is limited to (specific) 240 C, which effectively avoids the problem. This is the most outstanding feature of other electric heaters.

The energy saving effect of ptc fan heater is very significant. This is because the output power of ptc heater decreases significantly with the increase of ambient temperature. The output power of ptc heater decreases about 1800W at 20 C when the air flow is unchanged at 2.1m3/min. When the ambient temperature rises to +20 C, the output power of ptc heater decreases to about 1500W with an average increase of 1 C, and the output power decreases about 7W. This characteristic plays a role of automatic power regulation to a certain extent, it can also be understood that the lower the room temperature, the greater the output power of ptc heater, the faster the heating; conversely, with the increase of room temperature, the output power of ptc heater gradually decreases, the slower the heating rate.

Power is also a notable feature of ptc fan heater. ptc fan heater uses forced convection to heat the room temperature, because the coefficient of heat transfer of forced convection air is many times that of natural convection, so the heat transfer area needed to transfer the same heat is much smaller, so ptc fan heater can be made compact and portable, its volume and weight can be as small as the same power electrothermal cement. About 1/5, which is very suitable for hanging walls.

Immersion water heater with thermostat use matters needing attention

Immersion water heater with thermostat use matters needing attention

1. components are allowed to work under the following conditions:

A. air relative humidity is not greater than 95%, no explosive and corrosive gases. (excluding explosion-proof heater)

B. The working voltage of should not exceed 1.1 times the rated value, and the enclosure should be effectively grounded.

C. insulation resistance is greater than 1M ohm dielectric strength: 2KV/1min.

2. Electric heat pipe should be fixed and positioned. The effective heating zone must be immersed in liquid or metal solids. No air burning is allowed. When dirt or carbon deposit is found on the surface of the tube, it should be cleaned up and reused in time so as to avoid heat dissipation and shorten the service life.

3. When heating fusible metals or solid salts of nitrate, alkali, leaching, paraffin, etc., the applied voltage should be lowered first, and after the medium is melted, it can be raised to the rated voltage.

4. When heating air, the elements should be arranged evenly and cross-wise, so that the elements have good heat dissipation conditions, so that the air flowing through can be fully heated.

5. heating nitrate should consider safety measures to prevent explosion accidents.

6. The wiring part should be placed outside the insulation layer to avoid contact with corrosive, explosive media and moisture; the wiring should be able to withstand the temperature and heating load of the wiring part for a long time; the wiring screw should be tightened to avoid overexertion.

7. The components should be stored in a dry place. If the insulation resistance is lower than 1M for a long time, the components can be dried in the oven at about 200 degrees Celsius or heated by lowering the voltage until the insulation resistance is restored.

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What is the use of tubular heater with thermostat?

Tubular heaters are widely used to heat air, oil, water, chemical solvents, molds, etc. It is a very general heater. It consists of stainless steel seamless tube, spiral resistance wire and crystalline magnesia powder. It has excellent overall performance, long life and easy maintenance.
The spiral resistance wire is evenly distributed in the stainless steel seamless tube, and the crystalline magnesium oxide powder with good thermal conductivity and insulation property is filled in the gap. The structure is compact, the thermal efficiency is high, the heating is uniform, and the heat generated by the resistance wire is transferred to the stainless steel seamless tube through the magnesium oxide powder and diffused to the metal. The surface of the tube is heated by means of heat conduction and thermal radiation to achieve the purpose of heating up.
Tubular heaters can configure pipe diameter, size, heating power and end fixing mode according to customer requirements.