Shellab SCO10W-2 - Manual (Page 22)

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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
1/ confirm that fan is working
2/ check for air leak around CO2 sensor or fan motor shaft
3/ magnetic field interference
4/ door not sealing properly
5/ atmospheric pressure fluctuations
6/ defective Fyrite pump or tubing
7/ CO2 entering chamber too quickly
a- tank pressure too high
b- regulator set wrong
c- restrictor incorrect or missing
8/ electronic problem with CO2 sensor, interface or controller
9/ top of unit exposed to cold air drafts
10/ unit being operated without shadow box cover
11/ electrical interference
– atmospheric or conducted
12/ incubator too heavily loaded
Can't adjust set points or calibration -
"locked up"
1/ turn unit off and on to reset processor in controller
2/ if repeatedly happens, call Customer Service
Feeding continuously or abnormally high
CO2 usage
1/ do decay test: if more than 1% decay in an hour, check for leak : door
gasket tightness, motor inlet to chamber, sensor or probe inlet to
chamber, chamber access tube plugged
2/ check output signal from controller
3/ check solenoid valve for correct operation
4/ leak in plumbing including between regulator and CO2 tank
5/ door being opened too often
Won’t hold calibration – Fyrite reading
varies but display stable
1/ atmospheric pressure fluctuations
2/ top of unit exposed to cold air drafts
3/ unit being operated without shadow box cover in place
4/ condensation collecting on CO2 sensor
5/ CO2 sensor or interface failure
6/ unit incorrectly calibrated, see section 5.4
7/ taking Fyrite reading too soon after the door has been opened
8/ air leak around CO2 sensor mounting plate
Low CO2 alarm activated and nGS (NO
Gas warning) flashing on CO2 display.