Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 76)

IM 11M12A01-05E 7-3
7. Startup
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 7.3 shows the infrared switch and the display. Table 7.1 shows the three switch
(keys) and functions. Figure 7.3 shows the infrared switch and the display.
2: Infrared switch
4: Decimal
point
1: Data display
area
3: Engineering-unit
display area
> > ENT
M m N k g a l b b l %
scftm3 /d /s /h /m
F7.3E.EPS
Figure 7.3 Infrared switch and the display
1. Data display area: Displays the humidity, 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 humidity is dis-
played.
4. Decimal point: A decimal point is displayed.
Table 7.1 Switch and Function
Switch Function
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.
`
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T7.1E.EPS
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 com-
pletely remove your finger from the surface. Then touch it again.
Infrared switches consist of two elements: an infrared emitting element and an infrared
receive element. Infrared light-waves from the element bounce on the operator’s finger
and are reflected back to the receive element, thereby causing the infrared switch to turn
on and off, depending on the strength of the reflected light-waves. From these operating
principles, carefully observe the following: