6 How to Operate in Maintenance Mode
6-2. Displaying contrast of the interferometric sensor
- 22 -
LCD display
Menu detail
Display pressure at sensor part
Display temperature at sensor part
6-2. Displaying contrast of the interferometric sensor
When the SET switch is pressed while the LCD displays
,
appears for about one second. After that, the CONT and
AL1 lamps light up as shown in the right figure and the contrast of
interferometric sensor measured by the light source 1 is displayed.
When the
/
switch is pressed,
is displayed and then the
contrast of interferometric sensor measured by the light source 2 is displayed.
The contrast is an index of degree of contamination of the interferometric sensor. The value is decreased as
the degree of contamination rises. When the contrast falls below 0.35, the CONT lamp blinks during
measurement. If it falls to or below 0.30, the system is put into a troubled state (see "5-6. Error display and
remedial actions").
Check this value regularly to estimate the extent of contamination or rough replacement timing of the
interferometric sensor.
When the
mark of the MAINTENANCE switch is pressed,
returns on the display.
6-3. Displaying light volume of the interferometric
sensor
When the SET switch is pressed while the LCD displays
,
appears for about one second. After that, the BRIGHT and
AL1 lamps light up as shown in the right figure and the light volume of light
source 1 is displayed.
When the
/
switch is pressed,
is displayed and then the
light volume of light source 2 is displayed.
These values are indexes of deterioration of respective light sources. When a light source with the light
volume below 256 is detected, the BRIGHT lamp blinks during measurement. If the light volume falls to or
below 128, the system is put into a troubled state (see "5-6. Error display and remedial actions").
Check this value regularly to estimate rough replacement timing of the interferometric sensor.
When the
mark of the MAINTENANCE switch is pressed,
returns on the display.
0. 5 0 8
4 6 2
