Freestanding microwave oven: functions and characteristics

"Birthday" microwave - 8 of the 10 months of the distant 1945. On this day, the inventor Percy Spencer was awarded a patent for the invention.

American scientists have helped accident. He felt being near a radiator waves for military radar, softening of chocolate bar in his pocket. Further experiments were corn and egg - in the first case turned popcorn, in the second - blast.

And there was a new invention - the microwave. In modern models of waves of ultrahigh frequency (UHF) is heated and cooked food.

How does the microwave

Already in 1947 at the United States military kitchens were first 340 kilogram microwaves in human growth height. Since 1962, in the series went the microwave for domestic use, but the Japanese company «Sharp». It also launched the first rotating platform within the furnace in 1966, and since 1979 microprocessor control used in furnaces.

Years of research and development of microwave ovens it possible to minimize the size, debunked myths about the harm of microwave radiation. Check how it works - put in the oven broken cell phone, close the door and dial her number. If you get through it did not work - the unit is well shielded and does not transmit radio waves, so - safely.

Microwave is a metal (rectangular or hemispherical) parallelepiped with the magnetron, the power control unit and system.

Power supply 220 is converted to the magnetron to a value of 2000 volts and provides energy for the formation of electromagnetic wave frequency of 2450 hertz.

Frequency waves such water molecules are forced from the food to move and interact with each other. As a result of this process, heat and heating of the food. Warming occurs from the upper to the lower layer on the radiation steps depth - 25 mm. The only exceptions are the bakery, which is inside the heating begins.

The type and configuration

By type of microwave oven is divided into disposable and separately built into the kitchen furniture. In appearance and parameters they differ little. The advantage of built-in models - saving space in the kitchen. Minus - the price is higher than that of other types of devices, because of the need to improve the thermal insulation of housing.

Free-standing microwave has a smaller level of protection against the heat emitted during heating that manufacturer's instructions noted distances are observed between the equipment and furniture, or other household technology. The cost of these microwaves is smaller than embedded. They are equipped with a door which opens downward or sideways.

Detached microwave - a popular and common product by virtue of its price category and a simple fabrication. Such a product will find a place on any kitchen, but for embedded option will have to spend to replace kitchen furniture.

Types of freestanding microwave ovens

Solo

Oven quickly produces defrosting or heating of food and products. it does not perform other tasks. Meals in a microwave oven of this type are prepared without baking and without the formation of a crust on the products.

It is in demand for heating food in the rooms reception offices of food. These devices are economical in terms of electricity used, the price is democratic. the volume of the standard for the test species - up to twenty liters.

Microwave oven with grill

Microwave oven heats foods and baked dishes. Grill performs heating by the heating element or through a quartz heating element. In the first position, heat transfer occurs from the tubular heating element, which makes for easy moving.

Oven with quartz heating element - compact, but heating technology provides heat transfer to one direction - in the plane in which the fixed quartz lamp.

Microwave oven with convection and grill

Able to make a meal of complex technology, but the functional equivalent to the oven.

Convective heat transfer occurs due to built-in fan, which moves the hot air to all zones inside the apparatus. Due to the uniform temperature in any zone, the dish is warmed uniformly and thoroughly identical oven or skewer.

Functions and features microwaves

internal coating

When choosing a microwave oven stop attention to the material of the inner chamber cover - it affects the life of the model and the ease of cleaning the camera.

Heat-resistant enamel

A common variant of the coating. Convenient surface - with a sink just remove carbon deposits and food remains on the chamber walls, which do not require much effort or time.

The coating is resistant to temperature fluctuations, but can not withstand frequent high heat mode of operation. Because of this, the product life cycle is limited to 5-7 years.

As a disadvantage, there is ease of damaging the enamel surface during careless purification. From high temperatures in places scratches, cracks on the surface, which reduces the operation period.

Stainless steel

The material is strong and relatively cheap, which ensures long service life. Advantages of steel in the resistance to thermal differences of the frequent mode and prolonged high temperatures, and damage to the material - is not possible.

Negative point - to such coating easily adhere deposition burnable fat droplets. Such contamination is difficult to deduce. A means within the furnace chamber will require constant attention and care.

bioceramics

The latest development of the scientific community, which includes the advantages of the previous two surfaces. It is not susceptible to scratches, it does not burn up fat deposits quickly and easily cleaned, which lengthens the service life.

The only negative factor currently is the high cost of these models. For the same functionality the price, compared to other models, will be twice as high.

antibacterial

Today does not cheap models have an antibacterial coating. On the surface of this model decreases the amount and rate of microbial propagation medium, which is confirmed by laboratory tests.

domestic volumes

Choosing a microwave oven must not forget that: the greater the volume of its chamber, the larger the size of the prepared dishes in it.

And less than 20 liters

Small models are equipped with only the functions for thawing and warming food. The advantage of such microwave ovens - compact dimensions and low cost. But in the microwave this volume will enter a large plate.

23-25 ​​liters

This device will warm up and produce meals in several modes. This is convenient for families of 3-4 people, as this amount can simultaneously heat two standard servings of food.

26-28 liters

In these microwave ovens function is implemented using a cooking grill. In the microwave grill is also less common, but it is not possible to get involved.

30-40 liters

This is the largest model in which perfectly prepares the meat pies and baked through. Devices of this volume belong to the premium class and are equipped with a maximum list of functions.

microwave power

Pay special attention to the power unit during the inspection liked the microwave oven. The more parameters you select, the better and more efficiently be cooked dish.

Manufacturers produce models with power from 450 watts to 1680 watts. This value should be compared with the volume of the device: the volumetric chamber, the greater the power-demand.

Up to 70% of the units sold in the market with a capacity of 800-1000 watts. Less power to take into consideration is not necessary, unless the buyer is aimed at the acquisition of the microwave with the minimum volume.

control types

• Electronic touch controls - allows programming of cooking. In such devices the dirt is not clogged between regulators. Use include predetermined cooking mode, for example, "grilled chicken" or "fast defrosting". It may also be an input function from the device memory the individual cooking settings.
• mechanical control - is designed as a regulator. They are easy to manage, but such models are usually available with limited functionality. In addition, the knob dust settles, which reduces the convenience of cleaning.
• clockcontrolled - it happens buttons and controls. Use selected cooking mode and switches - set time and power.

modes

Not the cheapest models of microwave ovens are equipped with regimes that facilitate the work of housewives:

• automatic maintenance of temperature - maintains the desired food cooking temperature, if necessary turning on or off the magnetron;
• auto cooking - memory for the preparation of certain dishes;
• defrost / avtorazogrev - automatic determination of type of temporary product of the device;
• Programming recipes in memory - Storing the own cooking settings and use them after introduction parameters specified manually (e.g., type of food and the food weight);
• accelerated defrosting / heating - quickly defrost / heats the products, with small portions;
• start delay function - heating includes cooking, pre-installed in the chamber, at the appointed time.

Quality

Cost furnaces, leaders in quality among these devices vary in functionality, but the model is equally well from junior to senior.

By purchasing a cheap and simple device, be sure - it will be safe and manufactured with high quality materials.

Manufacturers are worthy of service, it is important that consumers, on a daily basis using the appliances.

In the premium group are often elegant and user-friendly design, high quality bioceramic coating and electronic controls. This significantly increases the cost models.

Inflate the price and brand recognition. When comparing identical in size and functional products, the price will be 15-20 percent higher.

Modern brand microwave oven equipped with a display, camera illumination push-button for opening, trochanter, and sensor pair for cooking container, blocking the inclusion children and other useful functions.

malfunctions

Palm among the faults keeps the problem of the lack of heating products. In this case, the indication means indicate the rate if the camera has a grill - it works. Sometimes it can spontaneously disconnect.

The causes of the fault may be as follows:

• breakdown of high-frequency magnetron discharge from the housing;
• damage to the power supply circuit, the voltage converter and parts of the magnetron;
• high voltage fuse blown.

In order to eliminate the causes of the first checked condition mica plate covering the doorway to the magnetron. If the plate is dirty or there is damage on it, its clean or change.

Then, the general cleaning of the inside chamber. Recommended to clean with ethanol or vodka. If the damage under the mica paint, the problematic place is cleaned and covered with a heat-resistant special paint. In the extreme case - just trimmed down to the metal.

Food residues, gathered during the operation of the microwave to form a conductive layer, which reduces the power passing through the mica plate electromagnetic waves. At best, the food is heated by the longer.

At worst, - due to the contact conductive layer formed with a metal device housing - a high-frequency discharge occurs between the antenna of the magnetron and the oven housing. Thus there is a one-time allocation of large amounts of heat. It is enough to destroy the mica plate and the cap of the antenna of the magnetron, which means that they automatically substitute.

Other causes microwaves require additional troubleshooting diagnostics, therefore all manufacturers recommend to contact the service centers.