16
Checking for clogging [CLOG CHECK]
If the gas path, such as the needle or tubing, is clogged, the gas cannot be suctioned properly, and correct measurement cannot
be made. A clogging check is performed to check for any clogging.
The clogging check makes a decision using the pressure sensor that is built into the gas path.
If the gas path is not clogged, the pressure will be between 0 and -5kPa. If it is completely clogged, the pressure will be approx.
-40kPa.
Check for clogging in the following types of situations.
(1) If “Negative pressure detected” displays while measuring the sample.
(2) If the measurement takes longer than usual, or if “Sensor unstable” displays.
(3) If the measured value is higher or lower than usual.
“Negative pressure detected” display
“Sensor unstable” display
1.
When the Measurement Standby screen is displayed, press
.
The MENU screen opens. Immediately after opening, “CAL” is selected (flashes).
2.
Press
twice.
The cursor moves, and “FUNC” is selected (flashes).
3.
Press
.
The FUNC MENU screen opens.
Immediately after opening, “CLOG CHECK” is selected (flashes).
4.
Press
.
The CLOG CHECK screen opens.
<Display example>
