Hach BioTector B7000 User Manual

Page 138
Section 9 Troubleshooting of System Faults & Warnings
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
CONDITION
CAUSE/REMEDY
01_LOW O2 FLOW - EX
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.
Various, for example,
Empty O
2
cylinder, O
2
supply
problem. Blocked O
3
destructor.
Blocked tube after MFC.
Faulty/blocked Exhaust Valve.
Faulty MFC.
02_LOW O2 FLOW - SO
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.
Various, for example,
Empty O
2
cylinder, O
2
supply
problem. Faulty/blocked Sample
Out Valve. Blocked tube after
MFC. Faulty MFC.
03_HIGH O2 FLOW
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.
Faulty MFC.
High O
2
pressure.
04_NO REACTION
(can also be programmed as
a warning condition)
No TOC (or TC) CO
2
peak detected or
the CO
2
peak is below the “CO2
LEVEL” for 3 consecutive reactions.
See System Configuration, Reaction
Check section for details.
Acid/Base reagents are at
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.
05_PRESSURE TEST FAIL
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.
Gas/liquid leak in the BioTector.
Valve leaking or not sealing.
Check Sample Out Valve,
Sample ARS Valve and system
fittings. Check Circulation Pump.
06_PRESSURE CHCK FAIL
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.
Gas/liquid leak in the BioTector.
Valve leaking or not sealing.
Check Sample Out Valve,
Sample ARS Valve and system
fittings. Check Circulation Pump.
07_TIC PRESSURE FAIL
MFC flow did not drop below the
“PRESSURE TEST FAULT” level
during the TIC reactor pressure test
cycle in TC - TIC systems.
Gas/liquid leak in BioTector TIC
reactor or lines. Valve leaking or
not sealing. Check TIC Sample
In/Out Valves and fittings.

Hach BioTector B7000 Specifications

General

Brand	Hach
Model	BioTector B7000
Category	Measuring Instruments
Language	English