Fellow Kogyo FOCAS-2000 Instruction Manual page 28

Page. 27
Maintenance and Checking
8
.
Zero-point compensation (Zero Adjust press Enter)
8-2-3.
The zero-point compensation is disabled when oil concentration over 5 ppm is detected in the zero-point compensation after sensor
A
cleaning because of oil or residue of contaminant in the detection tube.
With this, the explanation is completed about the failure of the zero-point compensation when an oil concentration over
5 ppm is detected.
The zero-point compensation is disabled when the detection tube is judged to be dirty (because oil or contaminant on the inside wall of the
B
detection tube cannot be flushed away by sensor cleaning) or when oil concentration over 5 ppm is detected in the zero-point compensation.
With this, the explanation is completed about the failure of the zero-point compensation when an oil concentration over
5 ppm is detected.
Function for recovery after zero-point compensation (Recover press Enter)
8-2-4.
This function is used to reset the compensated value (compensated by "8-2-2 Zero-point compensation") to the initial value (not compensated).
With this, resetting to the uncompensated value is completed.
This example shows a case that an oil concentration over 5 ppm is detected.
Shows an oil concentration outside the compensation range.
This example shows compensation of oil concentration from 5 ppm to 0 ppm.
Press "Enter."
Opens the fresh water valve to flush fresh water into the detection tube to keep the performance of
the tube. The remaining flushing time is displayed on the lower right part of the screen.
Press "Enter."
On the next screen, you can select one of two methods.
Press "Esc" to go back to "Main Menu" or press "Enter" to retry the zero-point compensation. (It
is recommended to turn off the oil concentration detector and clean the sensor before retrying the
zero-point compensation function.)
In this case, the zero-point compensation is not implemented.
Displayed when the inside of the detection tube is dirty.
(In this display example, 10 ppm
To warn that the detection tube is dirty. Press "Enter."
Opens the fresh water valve to flush fresh water into the detection tube to keep the performance of
the tube. The remaining flushing time is displayed on the lower right part of the screen.
Press "Enter."
On the next screen, you can select one of two methods. Press "Esc" to go back to "Main Menu"
or press "Enter" to retry the zero-point compensation. (It is recommended to turn off the oil
concentration detector and clean the sensor before retrying the zero-point compensation function.)
In this case, the zero-point compensation is not implemented.
Keep on pressing "Esc" for two seconds or longer
Press " " three times.
"Maintenance Mode" is set.
Press "Enter."
Press " " four times.
Press "Enter."
Resets the zero-point-compensated value to the previous value (before compensation).
Press "Esc."
"Main Menu" is displayed back.
10 ppm)