29
Symptom
Check
Action
Refer-
ence
page
The power does not
turn ON.
The display does
not turn ON.
Did you press
?
Press
.
3
Are the batteries set?
Insert the batteries.
Are the batteries old?
Replace the batteries with new ones.
Are the batteries inserted in the right direction?
Reinsert the batteries in the right direction.
Is 100 VAC power supplied?
Connect the AC adapter.
Is the AC adapter correct?
Use the enclosed AC adapter.
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 O
2
measurement value
is low.
Was the span calibrated?
Take sufficient time to stabilize and then calibrate the span.
(If an approx. 5% deviation from the true value can be tolerated, the span
should be calibrated when the oxygen concentration in the atmosphere
is 20% O
2
or less, or 22% O
2
or more as a guide.)
6
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
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 warran-
ty is still valid.)
26
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 low.
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 replace-
ment and repairs.
37
The displayed O
2
measurement value
is high.
Was the span calibrated?
Take sufficient time to stabilize and then calibrate the span.
(If an approx. 5% deviation from the true value can be tolerated, the span
should be calibrated when the oxygen concentration in the atmosphere
is 20% O
2
or less, or 22% O
2
or more as a guide.)
6
Was a sample with a high concentration of O
2
just mea-
sured?
Measure the atmosphere once and then measure the same again The
value can be high immediately after a high concentration sample was
measured.
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
Is the oxygen sensor correctly mounted?
- - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
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
Is the oxygen concentration in the atmosphere 20% O
2
or
less, or 22% O
2
or more?
Calibrate the span.
6
If the symptoms do not improve even after taking the above
actions, the main unit may be faulty.
Make a request for repairs.
37
