71
TROUBLESHOOTING
Symptom
Items to check and countermeasures
Normal cultures are not possible,
and the CO
2
gas density is
suspect.
Is the ambient air environment around the incubator normal? Is there a source of polluted
gas in the vicinity?
Does the chamber temperature decrease due to those such as that the door is
frequently opened and closed, and the water of the humidifying tray is considerably
being low? For the heat conduction type CO
2
sensor, CO
2
concentration higher than
actual is displayed when the humidity inside the unit decreases due to its
characteristics.
CO
2
gas is not being injected.
CO
2
control for the incubator follows the ON-OFF method. CO
2
gas is intermittently
injected as the gas density in the chamber approaches the set value. Injections may be
stopped for periods of approximately 15 seconds, but that is not an error.
The CO
2
gas density is slow to
recover.
A HEPA filter is used for the incubator CO
2
gas piping. If gas density is slow to recover
when the CO
2
gas pressure is normal, it is possible that the HEPA filter may be clogged.
Contact our sales representative or agent.
Is there little gas remaining in the CO
2
gas cylinder?
Is the secondary pressure for the gas regulator at the specified value of 0.03 MPa(G)–
0.1 MPa(G) (0.3 kgf/cm
2
(G)–1 kgf/cm
2
(G), 4.4 psi(G)–14.5 psi(G))?
Is the gas tube blocked?
Is the duct securely attached? (See page 23)
Is the fan attached properly? (See page 23)
