Hach BioTector B3500C User Manual

Page 137
Section 9 Troubleshooting of System Fault, Warning and
Notification Events
9.1 BioTector Fault Event Explanation and Remedial Action
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 FAULT relay. When the
system fault is rectified, acknowledge the fault by pressing the ENTER key in the Fault Archive menu.
Detailed information on system operation, commissioning & startup, service and Process Tests are available
in the MMC/SD card shipped with the BioTector. It is recommended to review these documents for
troubleshooting purposes.
If the BioTector LCD Screen is not operating, check the main power switch and confirm the red light on the
switch is ON. Check/replace Fuse 2 on the motherboard.
FAULT
CONDITION
CAUSE/REMEDY
01_LOW O2 FLOW - EX
MFC oxygen flow through the Exhaust
“EX” Valve (MV1) has been below
50% of its setpoint for the time longer
than the “LOW O2 FLOW TIME”
defined in Fault Setup menu.
This fault may be initiated after the
occurrence of warnings 92/94/96/98
HI/LO AIR/O2 PRESSURE.
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.
Blocked ozone destructor.
Blocked tube after MFC.
Faulty/blocked Exhaust Valve.
Faulty MFC.
Run Flow Test (see Section
8.1.1.2 Flow Test for details).
02_LOW O2 FLOW - SO
MFC oxygen flow through the Sample
Out “SO” port (through Reactor Valve,
MV3) has been below 50% of its
setpoint for the time longer than the
“LOW O2 FLOW TIME” defined in
Fault Setup menu.
This fault may be initiated after the
occurrence of warnings 92/94/96/98
HI/LO AIR/O2 PRESSURE.
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.
Blocked tube after MFC.
Faulty MFC.
Run Flow Test (see Section
8.1.1.2 Flow Test for details).
03_HIGH O2 FLOW
MFC oxygen flow through the Exhaust
Valve (MV1) has been above 50% of
its setpoint for the time longer than the
“HIGH O2 FLOW TIME” defined in the
Fault Setup menu.
Faulty MFC.
Check oxygen pressure looking
at the Oxygen Controller Status
(O2-CTRL STATUS) menu. It
should be 400mbar (±10mbar) at
20 l/h MFC flow.

Hach BioTector B3500C Specifications

General

Brand	Hach
Model	BioTector B3500C
Category	Measuring Instruments
Language	English