Specifications

CO2 Analyzers 3100 & 3150
Instruction 19-9339 42
Under and Over Range Codes
If a reading is over range (i.e. above the maximum allowed reading)
it will be displayed with ‘more than’ chevrons (>>.>). This can occur
if a channel has been incorrectly calibrated or the sample gas has
exceeded its specifi ed range (e.g. CO
2
>20%).
If a reading is under range (i.e. below zero) it will be displayed with
‘less than’ chevrons (<<.<). Refer to Section 7.0 Calibration to remedy
under-range by performing a user zero.
A number displayed as asteriks (**.*) indicates an error, usually where
the instrument has been unable to complete a particular calculation.
Typically, this will be the fi rst indication of a fault condition.
Where no data is available, dashes (--.-) are displayed. This usually
occurs when a particular reading or parameter has been skipped by
the user, or where an optional accessory is not fi tted correctly, i.e. a
temperature probe.
8.2 Self-Test Warning Messages
The following warnings may be displayed during the self-test period
when the instrument is switched ON.
Warning Description
Check Memory The instrument only has space to store less than 50 readings
before it is full. The exact number can be checked using the “VIEW
READINGS” option.
Memory Full There is no more space in memory to store readings. Both the
store and log options will be disabled until the memory is cleared.
The readings should be downloaded to PC using the optional soft-
ware before memory is cleared.
Battery Low The instrument does not have enough power to operate for a full
day. The instrument should be recharged or connected to an exter-
nal power supply.
Service Due It has been 12 months (or more) since your instrument was
returned to the manufacturer for a service. The performance and
accuracy of the instrument may be impaired.
Low Flow The instrument’s gas inlet (or outlet) may be blocked. This warning
is most commonly caused by a water-logged or dirty sample fi lter.
Change the sample fi lter and check for obvious blockages in the
sample tubes.