Shellab SCO2W-2 - Manual (Page 19)

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1/ turn set point up and down to see if solenoid valve works by feeling
and listening to valve
2/ recalibrate with Fyrite, see section 5.11 and section 7.0
3/ fan not operating correctly
a- fan motor stopped
b- fan blade fell off
c- wrong fan blade installed or mounted backwards
4/ wrong restrictor installed or missing altogether
5/ tank pressure too high, see section 5.9.A
6/ CO2 sensor partially plugged with dirt or condensation
7/ regulator set wrong, see section 5.9
8/ incubator too heavily loaded
9/ incubator being operated without shelving
10/ CO2 attached to sample port instead of “CO2 IN” fitting
12/ if display and Fyrite does not match, see Troubleshooting Co2-5
Overshoots set point and continues to rise
- display and Fyrite match
1/ debris in solenoid causing it to leak continuously
2/ solenoid failed while open
3/ unit miss-wired
4/ controller output failed or shorted
5/ CO2 sensor or interface failure
6/ CO2 sensor plugged by debris or condensation
Rises very slowly
1/ restrictor partially plugged
2/ filter overly dirty or partially plugged
3/ CO2 tank regulator set too low, see section 5.9
4/ hose kinked or leaking
5/ poor door seal
6/ CO2 tank contains mixed gas, not 100% medical grade CO2
Never rises
1/ CO2 tank empty
2/ solenoid failed while closed
3/ CO2 controller output failed while open
4/ restrictor plugged
5/ CO2 hose blockage
6/ CO2 filter plugged
7/ set point is at 0.0 and has not been reset, see section 5.3 and 5.4
Display and Fyrite reading do not match
1/ calibration error - clear chamber for 12 hrs and confirm at "0"
2/ turn set point up and down to see if solenoid valve works by feeling
and listening to valve
3/ assure that IR tube block is completely tight, 24 series
4/ if display is varying when doing Fyrite test, have a leak on IR base or
mounting plate, or CO2 is injecting at time of test.
5/ take voltage reading across sensor leads 0=0V and 20=1V
6/ assure that sensor is properly mounted
7/ DISPLAY LOWER THAN FYRITE: air leak around the CO2 sensor or
the fan motor shaft
8/ DISPLAY HIGHER THAN FYRITE: leak in tube from sample port to
chamber, verify with liquid soap solution.
9/ DISPLAY HIGHER THAN FYRITE: Fyrite fluid worn out, replace fluid
with Fyrite refill.
10/ DISPLAY HIGHER THAN FYRITE: poor Fyrite sampling technique,
see section 6.0
11/ DISPLAY HIGHER THAN FYRITE: defective Fyrite pump or tubing
12/ CO2 sensor, interface or controller failure
Is unstable – display or actual reading
varies around set point