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NN-8507, NN-8557
NN-8807, NN-8857
AUTO SENSOR EXPLANATION, K FACTORS AND POWER LEVELS
(For NN-8807, NN-8857 only)
1. Auto sensor cooking
Auto sensor cooking is a revolutionary way to cook by microwave with-
out setting a power level or selecting a time.
All that is necessary is to select an Auto Sensor Program before start-
ing to cook.
Understanding of Auto Sensor Cooking
As a food cooks, a certain amount of steam is produced. If the food is
covered, this steam builds up and eventually escapes from the con-
tainer. In Auto Sensor Cooking, a carefully designed instrument, cal-
led the humidity sensor element, senses this escape of steam. Then,
based upon the Auto Sensor Program selected, the unit will automati-
cally determine the correct power level and the proper length of time
it will take to cook the food.
NOTE: Auto Sensor Cooking is successful with the foods and recipes
found in the Auto Sensor Cooking Guide. Because of the vast
differences in food composition, items not mentioned in the
Cooking Guide should be prepared in the microwave oven using
power select and time features. Please consult Microwave
Cookbook for procedures.
2. Auto sensor cooking process
Explanation of the Auto Sensor Cooking process (See Fig. 14A)
1) The shaded columns in the graph indicate when the humidity sensor
heater is on.
2) During the first 60 second period there is no microwave activity, and
when calculating the T2 time by using the formula below make sure
this 60 seconds is subtracted from the T1 time. In other words T1 time
starts at the end of the 60 second period. (This 60 second period is
needed for the sensor element to stabilize and balance itself to the
humidity present before microwave activity starts.)
3) T1 time-:::-The total amount of time it takes the microwave oven to
switch to T2 time after the 60 second period. During this time one of
the Auto Sensor programs (A1-A8) will be shown in display.
4) T2 time-----When the steam escapes from the cooking container
placed in the oven, the humidity sensor detects it and the microp-
rocessor calculates the balance of cooking time. This T2 time is then
shown in the display and begins counting down.
NOTE: If T1 time is over 60 minutes, oven stops automatically and "FF
FF" appears in display window.
Balance of cooking time (T2 time)
The balance of cooking time which is called T2 time, can be calcu-
lated by the following formula.
T2 time (in sec.) =T1 time X K factor
NOTE: When calculating T2 time, the last digit of T1 time in seconds is
cut away. For instance, if the T1 time is 76 seconds, the T2 time
will be:
T2=70X
K
Remember, the T1 time starts after the 60 second period. The
coefficient K is programmed into the microprocessor memory
and they are listed in the following tables along with the P1 and
P2 powers. (See Fig. 14B)
NOTE: When "More" or "Less" pad is selected, the K factor varies as
shown in Fig. 14B resulting in T2 time to be increased or de-
creased.
Example of calculating the T2 time
Example 1: If the T1 time is measured to be 2 minutes and 45 seconds
after the 60 second period, and the Auto program selected is
(COOK) AS:
T2=Ti
XK
= 2 min. and 45 sec. X 0.9
= 160 sec. X 0.9
= 144 sec.
= 2 min. and 24 sec.
& (CooK),24 (FROZEN - COOK)
Magnetron
Steam
Door
on
detected
Stop open
yy
vv
!
1
1. T1 time
1
T2 time
!
1
!
1
1. 30 min.
115 sec.)
—\_
o>
P1 power
Refreshing
Fig. 14A
& (cook)
K factor
'Senso | woe [toe
HIGH
HIGH
approx. 0.1
approx. 0.1
HIGH
HIGH
| os | approx. 1.1
approx. 0.7
Fig. 14B
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