4 How to Use
4-4. How to detect
GP-1000
- 20 -
NOTE
Use only a gas sampling hose specified by RIKEN KEIKI.
Use the gas detector with the gas sampling probe connected so that no foreign substance is drawn into
it.
An oxygen concentration higher than a certain level is required for the sensor of the gas detector to
correctly detect gases and display concentrations.
Correct detection may not be performed under the presence of high-concentration combustible gas due
to insufficient oxygen concentration. Once a gas exceeding 100% LEL is detected, the over display
(
∩∩∩∩
) is held even if the combustible gas concentration drops.
Long-time detection of a high-concentration combustible gas may adversely influence the sensor.
In a low-temperature environment, the operating time is shortened due to the battery performance
property.
At a low temperature, the response of the LCD display may get slow down.
If a combustible gas with a higher concentration than 100% LEL is drawn, some gas may remain in the
gas sampling hose due to adsorption in the hose, gas sampling probe, etc. After drawing a
high-concentration combustible gas, clean the gas detector to remove the adsorbed gas (draw fresh air
and check that the reading becomes zero).
Performing fresh air adjustment before cleaning it completely will result in inaccurate adjustment, giving
adverse influence on measurement. In such a case, remove the gas sampling hose before performing
fresh air adjustment to avoid inaccurate adjustment.
CAUTION
Before performing gas detection, attach the gas sampling probe provided with the gas detector
to prevent disturbances by air dust.
