Hach BioTector B7000 User Manual page 143

WARNING
47_TN ZERO CHCK FAIL
50_TIC OVERFLOW
51_TOC OVERFLOW
52_HIGH CO2 IN BASE
53_TEMPERATURE ALARM
54_COOLER LOW TEMP
55_COOLER HIGH TEMP
CONDITION
TN Zero Check result is outside the
specified TN BAND defined in
Sequence Program, Zero Program
menu.
High TIC reading at the end of the TIC
phase, even though the TIC sparge
time has been automatically extended
to its maximum time of 300s. See
System Configuration, Reaction Check
section for details.
High TOC readings at the end of TOC
phase, even though the TOC time has
been automatically extended to its
maximum time of 300s. See System
Configuration, Reaction Check section
for details.
CO level in the base reagent, which is
2
checked during the Zero Calibration or
Zero Check cycles, is higher than the
"BASE CO2 ALARM" level
programmed in Fault Setup menu.
Temperature of the BioTector is above
the "TEMPERATURE ALARM" level
programmed in Fault Setup menu.
BioTector fan operates constantly in
backup mode until the warning is
acknowledged.
Cooler temperature has been below
2°C for longer than 600 seconds. See
System Configuration, Cooler Program
section for details.
Cooler temperature has been 5°C
above the set point (programmed by
"COOLER" in Cooler Program menu)
and 8°C below the ambient
temperature for longer than 600
seconds. See System Configuration,
Cooler Program section for details.
CAUSE/REMEDY
Confirm DI Water is connected to
the ZERO port of the BioTector
during zero calibration cycle.
Check the stability of the zero
reactions and the quality of the
reagents used. Check the settings
in Zero Program menu. Check the
operation of the BioTector.
Repeat the zero calibration cycle.
Exceptionally high TIC.
Check system operation ranges in
System Range Data menu.
Increase operation range to
reduce injected sample volume.
Increase the TIC SPARGE TIME
in System Program, Oxidation
Program 1 menu.
Exceptionally high TOC.
Check system operation ranges in
System Range Data menu.
Increase operation range to
reduce injected sample volume.
Increase the TOC SPARGE TIME
in System Program, Oxidation
Program 1 menu.
Confirm the base reagent CO
filter is serviced and in good
condition, and the container is
sealed. Check reagent quality.
Replace the base reagent.
Check temperature of the
BioTector. Check the filters in the
fan and vent. Check the operation
of the fan. Note: At temperatures
below 25°C, BioTector
automatically switches the fan off
to stabilize system temperature
using its internal heat.
Check the operation of the Cooler
by observing flashing LED 3 on
the Signal PCB. Faulty
temperature sensor. Replace the
Cooler.
Check the operation of the Cooler
by observing flashing LED 3 on
the Signal PCB. Faulty
temperature sensor or peltier
element. Current taken by the
Cooler peltier element should be
~1.4 Amp. Replace the Cooler.
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