Teledyne Max-5 - Combustion efficiency analyzer - Manual (Page 25)

-0.00/-0.0 The negative sign in a reading of -0.00 or -0.0 in the CO or COMB section after
auto zero is not significant.
bAd Indicates a bad reading from the cell. If the cell is outside its specifications or is noisy
and unstable, the computer cannot get a good reading, and the calibration adjustment required to
compensate may be greater than the maximum allowable adjustment, resulting in this error
message. REMEDY: Recalibrate the instrument or replace the cell.
CELL FAIL Means that a cell has failed or that a problem has occurred in a sensor circuit.
REMEDY: Isolate the faulty sensor circuit, replace the bad sensor, or rectify the circuit
problem, as necessary. Example: Thermocouple is not connected.
- - - Means that the value cannot be calculated. If the thermocouple is disconnected, for
example, then the computer cannot perform the efficiency calculation (which depends on
temperature data), and this error may occur; the efficiency reading will be - - -, and the
temperature reading will be OPt.
OFF Means off-scale for CO reading.
LO BATT Indicates the batteries are depleted or near depletion after about 8 hours use.
REMEDY: Recharge the batteries.
FAILURE WARNING SIGNS
The MAX 5 indicates failure warning signs with a CELL FAIL message on the LCD and a bAd
reading.
O
2
The cell output is low which results in too high a span requirement.
CO The inability to span or excessive noise indicate cell failure.
COMB. Excessive drift and the inability to span or zero indicate cell failure.
TEMP. A failure message on the temperature section indicates an open or short
thermocouple circuit.
CO
2
Conditions that contribute to failure or erroneous reporting of the carbon dioxide section
include failure of any of the other sensors or incorrect fuel selection.
OPt Open thermocouple or optional temperature simulation (Refer to “Temperature
Simulation” section).