30
Symptom
Check
Action
Refer-
ence
page
The displayed CO
2
measurement value
is high.
Was a sample with a high concentration of CO
2
just
measured?
Measure the atmosphere once and then measure the same again. The
value can be high immediately after a high concentration sample was
measured.
CO
2
calibration may not have been conducted properly.
Initialize the unit or conduct CO
2
calibration again with the CO
2
standard
gas on hand.
18
23
If the symptoms do not improve even after taking the above
actions, the CO
2
sensor may have reached its service life or
may be faulty.
The CO
2
sensor can be replaced only by Iijima Electronics Corporation.
Contact the dealer from which you purchased the product for
replacement and repairs.
37
The displayed O
2
measurement value
is zero.
Zero is displayed
even after the span
is calibrated.
Is the oxygen sensor correctly mounted?
Correctly mount the oxygen sensor onto the probe (blue).
26
Has water or foreign matter gotten between the oxygen
sensor and housing?
Remove the oxygen sensor and clean the inside of the housing. Lightly
wipe the metal mesh at the center of the oxygen sensor surface with
tissue paper, etc., to remove any moisture or foreign matter. Replace the
needle, membrane filter, check valve, and sampling tube with new parts.
26
27
Is the oxygen sensor wet, or have crystals formed on the
surface?
Replace the oxygen sensor with a new part.
(Contact the dealer from which you purchased the product if the
warranty is still valid.)
26
37
Is the probe cable damaged or disconnected?
Make a request for repairs.
37
If the symptoms do not improve even after taking the above
actions, the main unit may be faulty.
Make a request for repairs.
37
The displayed
CO
2
measurement
value is zero.
Is the check valve mounted in the correct direction?
Re-mount in the correct direction so that the narrow side of the check
valve faces the sampling tube.
27
Is the connection of the needle, membrane filter, check
valve, or sampling tube loose?
Securely tighten the connection for the needle, membrane filter, check
valve, or sampling tube.
26
27
Is the needle, membrane filter, check valve, or sampling tube
clogged?
Check for clogging. If clogged, unclog the part or replace it with a new
part.
If the symptoms do not improve, make a request for repairs.
16
26,27
37
If the symptoms do not improve even after taking the above
actions, the CO
2
sensor may have reached its service life or
may be faulty.
The CO
2
sensor can be replaced only by Iijima Electronics Corporation.
Contact the dealer from which you purchased the product for
replacement and repairs.
37
The displayed O
2
and CO
2
measure-
ment value and
calibration value do
not change.
Is the check valve mounted in the correct direction?
Re-mount in the correct direction so that the narrow side of the check
valve faces the sampling tube.
27
Is the connection of the needle, membrane filter, check
valve, or sampling tube loose?
Securely tighten the connection for the needle, membrane filter, check
valve, or sampling tube.
26
27
Is the needle, membrane filter, check valve, or sampling tube
clogged?
Check for clogging. If clogged, unclog the part or replace it with a new
part.
If the symptoms do not improve, make a request for repairs.
16
26,27
37
Is the needle, membrane filter, check valve, or sampling tube
damaged?
Replace the damaged part with a new part.
26
27
(Only for O
2
) Is the oxygen sensor correctly mounted?
- - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
(Only for O
2
) Is the O-ring for the housing deviated?
Alignthe▲markontheprobe(blue)withthe▲markonthehousing
(red).
- - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - -
Firmly mount the O-ring for the housing in the groove.
26
If the symptoms do not improve even after taking the above
actions, the main unit may be faulty.
Make a request for repairs.
37