YOKOGAWA ZR202S, User Manual, Page: 66 / 163

<7. Startup>
7-3
IM 11M13A01-04E
7.4 Operation of Infrared Switch
7.4.1 Display and Switches
This equipment uses an infrared switch that enables operation with the cover closed. Figure 7.4
shows the infrared switch and the display. Table 7.1 shows the three switch (keys) and functions.
2: Infrared switch
4: Decimal point
1: Data display area
3: Engineering-unit
display area
>
>
ENT
µ M m N k g a l b b l
%
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Figure 7.4 Infrared switch and the display
1. Data display area: Displays the oxygen concentration, set values, alarm numbers, and error
numbers.
2. Infrared switch: Three switches perform data setting operations.
3. Engineering-unit display area: The percent sign appears when the oxygen concentration is
displayed.
4. Decimal point: A decimal point is displayed.
Table 7.1 Switch and Function
Switch Function
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1. Moves the position of the digit to the right. If you continuously touch the key, the position
of the digit will move continuously to the right, finally returning to the leftmost position
after reaching the rightmost position of the digit.
2. Selects Yes or No.
3. When you touch this key together with the [ENT] key, the previous display then appears,
or the operation will be cancelled.
^
Used to change values. If you continuously touch this key, the value of the digit will increase
continuously, e.g., from 1 to 2 to 3 (for numeric data), or from A to B to C (for alphabetic
characters), and finally return to its original value.
ENT 1. Used to change the basic panel display to the parameter selection display.
2. Used to enter data.
3. Advances the operation.
The three infrared switches are activated by completely touching the glass surface of the switch. To
touch any of the keys continuously, first touch the surface and then completely remove your finger
from the surface. Then touch it again.
Infrared switches consist of two elements: an infrared emitting element and an infrared acceptance
element. Infrared light-waves from the element bounces on the operator’s finger and are reflected
back to the acceptance element, thereby causing the infrared switch to turn on and off, depending
on the strength of the reflected light-waves. From this operating principles, carefully observe the
following: