Sharp R-272M, Operation Manual, Page: 4 / 22

GB-3
The heating category (a letter A to E) developed by
MAFF (Ministry of Agriculture, Fisheries and Food)
with microwave oven and food manufacturers
indicates the ability of the oven to heat small
quantities of food (up to 500g [ I lb 2oz]). It does not
represent the general performance of the oven.
Food packs carry cooking instructions for heating
categories A to E. Follow instructions for the letter
corresponding to the oven's heating category. The
higher the output power and heating category of
the oven the less heating time is required as shown
opposit
Microwave output power
in Watts (based on
international (IEC 60705)
standard).
Letter representing the
oven heating category.
Microwave Symbol.
OVEN
OUTPUT
POWER
Less heating time required
600 700 800 900 1000 Watts
More heating time required
OVEN
OUTPUT
CATEGORY
Less heating time required
A B C D E
More heating time required
HEATING CATEGORY
Microwaves will pass through certain materials, such
as glass and plastic, to heat the food. (See' Suitable
Cookware' on page GB-16).
Water, sugar and fat in food absorb microwaves which
cause them to vibrate. This creates heat by friction,
in the same way your hands get warm when you rub
them together.
The outer areas of the food are heated by the
microwave energy, then the heat moves to the centre
by conduction, as it does in conventional cooking. It
is important to turn, rearrange or stir food to ensure
even heating.
Once cooking is complete, the oven automatically
stops producing microwaves.
Standing time is necessary after cooking, as it enables
the heat to disperse equally throughout the food.
Microwaves are energy waves, similar to those used
for TV and radio signals.
Electrical energy is conver ted into microwave
energy, which is directed into the oven cavity via a
waveguide. To prevent food and grease entering the
wave guide it is protected by the waveguide cover.
Microwaves cannot pass through metal, because of
this the oven cavity is made of metal and there is a
fine metal mesh on the door. During cooking the
microwaves bounce off the sides of the oven cavity at
random.
HOW YOUR OVEN WORKS
Microwave output power
in Watts (based on
international (IEC 60705)
standard).
Letter representing the
oven heating category.
Microwave Symbol.
(R-272M)
(R-372M)