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.

Vsec elec.

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.