Shellab SCO12WE-2 - Manual (Page 20)

19
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
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, SCO6WE (2406)
units
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
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