Troubleshooting Of System Faults & Warnings; Biotector Fault Conditions - Hach BioTector B7000 User Manual

Section 9
9.1

BioTector Fault Conditions

The following fault conditions activate the BioTector stop sequence, set all 4-20mA signals to the FAULT
LEVEL (1mA by default) programmed in the 4-20mA Program menu, and activate the COMMON FAULT relay
defined in Relay Program menu.
FAULT
01_LOW O2 FLOW - EX
02_LOW O2 FLOW - SO
03_HIGH O2 FLOW
04_NO REACTION
(can also be programmed as
a warning condition)
05_PRESSURE TEST FAIL
06_PRESSURE CHCK FAIL
07_TIC PRESSURE FAIL
Troubleshooting of System Faults & Warnings
CONDITION
MFC oxygen flow through the Exhaust
"EX" Valve (MV1) has been below
50% of its set point for the time longer
than the "LOW O2 FLOW TIME"
defined in Fault Setup menu.
MFC oxygen flow through the Sample
Out "SO" Valve (MV5) has been below
50% of its set point for the time longer
than the "LOW O2 FLOW TIME"
defined in Fault Setup menu.
MFC oxygen flow through the Exhaust
Valve (MV5) has been above 50% of
its set point for the time longer than
the "HIGH O2 FLOW TIME" defined in
the Fault Setup menu.
No TOC (or TC) CO
peak is below the "CO2
the CO
2
LEVEL" for 3 consecutive reactions.
See System Configuration, Reaction
Check section for details.
MFC flow did not drop below the
"PRESSURE TEST FAULT" level
during the pressure test cycle. See
Sequence Program, Pressure/Flow
Test Program section for more
information.
MFC flow did not drop below the
"PRESSURE CHCK FAULT" level
during the pressure check cycle for 3
consecutive reactions. See Sequence
Program, Pressure/Flow Test Program
section for more information.
MFC flow did not drop below the
"PRESSURE TEST FAULT" level
during the TIC reactor pressure test
cycle in TC - TIC systems.
CAUSE/REMEDY
Various, for example,
Empty O
problem. Blocked O
Blocked tube after MFC.
Faulty/blocked Exhaust Valve.
Faulty MFC.
Various, for example,
Empty O
problem. Faulty/blocked Sample
Out Valve. Blocked tube after
MFC. Faulty MFC.
Faulty MFC.
High O
peak detected or Acid/Base reagents are at
2
incorrect strength.
Acid/Base containers are empty.
Delivery problem or air bubbles in
Acid/Base lines. Acid/Base
Pumps are faulty. Circulation
Pump is not pumping.
Gas/liquid leak in the BioTector.
Valve leaking or not sealing.
Check Sample Out Valve,
Sample ARS Valve and system
fittings. Check Circulation Pump.
Gas/liquid leak in the BioTector.
Valve leaking or not sealing.
Check Sample Out Valve,
Sample ARS Valve and system
fittings. Check Circulation Pump.
Gas/liquid leak in BioTector TIC
reactor or lines. Valve leaking or
not sealing. Check TIC Sample
In/Out Valves and fittings.
cylinder, O supply
2 2
destructor.
3
cylinder, O supply
2 2
pressure.
2
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