Hach BioTector B7000i - 9.2 BioTector Warning Event Explanation and Remedial Action

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9.2 BioTector Warning Event Explanation and Remedial Action
The following warning conditions do not activate the BioTector stop sequence and leave the 4-20mA signals
un-changed and do not activate the fault relay. If there are multiple warnings in the system, check the fuses
on the Relay PCB and Signal PCB. When the warning is rectified, acknowledge the warning by pressing the
ENTER key in the Fault Archive menu.
WARNING
CONDITION
CAUSE/REMEDY
21_CO2 ANL LENS DIRTY
CO
2
Analyzer has detected dirt on its
optical system.
Clean the CO
2
Analyzer.
Clean the lenses on the CO
2
Analyzer.
22_FLOW WARNING – EX
MFC oxygen flow through the Exhaust
“EX” Valve (MV1) has dropped below
the “FLOW WARNING” level defined in
Pressure/Flow Test Program menu
8.3.4.6 Pressure/Flow Test Program
during the Pressure/Flow Test cycle.
Various, for example, oxygen
supply problem. Oxygen pressure
should be ~400mbar. See Section
8.1.6 Oxygen Controller Status
for details.
Partially blocked ozone destructor.
Partially blocked tube after MFC.
Faulty/blocked Exhaust Valve.
Faulty MFC.
Run Flow Test (see Section
8.1.1.2 Flow Test for details).
23_FLOW WARNING – SO
MFC oxygen flow through the Sample
Out “SO” Valve (MV5) has dropped
below the “FLOW WARNING” level
defined in Pressure/Flow Test Program
menu 8.3.4.6 Pressure/Flow Test
Program during the Pressure/Flow Test
cycle.
Various, for example, oxygen
supply problem. Oxygen pressure
should be ~400mbar. See Section
8.1.6 Oxygen Controller Status
for details.
Faulty/blocked Sample Out Valve.
Partially blocked tube after MFC.
Faulty MFC.
Run Flow Test (see Section
8.1.1.2 Flow Test for details).
26_PRESSURE TEST
WARN
MFC flow did not drop below the
“PRESSURE TEST WARNING” level
defined in Pressure/Flow Test Program
menu 8.3.4.6 Pressure/Flow Test
Program during the Pressure/Flow Test
cycle.
Small gas/liquid leak in the
BioTector.
Valve leaking or not sealing.
Open Sample Out Valve, inspect
for dirt/damage.
Check ARS Valve and system
fittings. Check Mixer Reactor.
Run Pressure Test (see Section
8.1.1.1 Pressure Test for details).
28_NO PRESSURE TEST
This warning is logged when the
pressure test procedure is skipped
during the system startup sequence.
This warning cannot be acknowledged
by the user. It can only be
acknowledged automatically by the
system next time the pressure test is
passed.
This warning occurs when the
Pressure/Flow Test is deactivated,
and when the “QUICK STARTUP”
function is used. See Section
2.2.1 Start Stop for details.