Hach BioTector B3500s, User Manual

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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. When the system 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
8.3.4.5 Pressure/Flow Test Program
during the Pressure/Flow Test cycle.
Various, for example,
air and oxygen supply problem.
Check oxygen pressure looking at
the Oxygen Controller Status (O2-
CTRL STATUS) menu. It should
be 400mbar (±10mbar) at 20 l/h
MFC flow.
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” port (through Reactor Valve,
MV3)
has dropped below the “FLOW
W
ARNING” level defined in
Pressure/Flow Test Program menu
8.3.4.5 Pressure/Flow Test Program
during the Pressure/Flow Test cycle.
Various, for example,
air and oxygen supply problem.
Check oxygen pressure looking at
the Oxygen Controller Status (O2-
CTRL STATUS) menu. It should
be 400mbar (±10mbar) at 20 l/h
MFC flow.
Faulty/blocked Reactor Valve
and/or Sample 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
8.3.4.5 Pressure/Flow Test
Program during the Pressure/Flow Test
cycle.
Small gas/liquid leak in the
BioTector.
Valve leaking or not sealing.
Open Reactor Valve, inspect for
dirt/damage.
Check 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.
The 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.