Hach BioTector B7000i - 8.3.8 Fault Setup

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8.3.7 Result Integration
RESULT INTEGRATION 3
 RESULT INTEGRATION (3 by default) defines the number of
reaction results to be averaged to get the actual TOC result.
INTEGRATION LIMITS 10% , 5.00
 INTEGRATION LIMITS controls the averaging function defined
in RESULT INTEGRATION above. The first parameter “10%”
defines the % band variation and the second parameter “5.00”
defines the absolute variation in mgC/l. If the reaction result is
outside the specified bands (INTEGRATION LIMITS), then the
reaction result averaging is omitted. In other words, the result
which is outside the INTEGRATION LIMITS is displayed at the
end of the reaction without averaging. If the result is within the
INTEGRATION LIMITS, the averaging function is continued and
the programmed number of reaction results (defined in RESULT
INTEGRATION above) is averaged.
8.3.8 Fault Setup
LOW O2 FLOW TIME 12s
 If the O
2
flow drops more than 50% of the MFC set value for
longer than the LOW O2 FLOW TIME (12s by default), a
“01_LOW O2 FLOW - EX” or “02_LOW O2 FLOW - SO” fault is
logged.
HIGH O2 FLOW TIME 20s
 If the O
2
flow increases more than 50% of the MFC set value
during any reaction phase for longer than the HIGH O2 FLOW
TIME (20s by default), a “03_HIGH O2 FLOW” fault is logged.
BASE CO2 ALARM 1000ppm
 During the zero calibration & zero check reactions, system
monitors the CO
2
peak level with the CO
2
Analyzer. If the
monitored value is higher than the programmed BASE CO2
ALARM level (1000ppm by default), a “52_HIGH CO2 IN BASE”
warning is logged into the fault archive.
CO2 ZERO LINE 0ppm , AUTO
 When it is set as AUTO (Automatic by default), the CO2 ZERO
LINE value is updated automatically by the system during
Analyzer Zero phase. If it is set as M (Manual), the set value
(ppm) is used as the fixed CO
2
zero line.
 For instance, if there is a CO
2
leak into the CO
2
analyzer’s
source or detector sections, a typical of 400ppm CO
2
level in the
environment will increase the CO2 ZERO LINE level to
≈250ppm within 24 days of online operation or approximately
after 5000 reactions.
CO2 ZERO ALARM 250ppm
 If the concentration of CO
2
measured during the Analyzer Zero
phase for the oxygen gas input is higher than CO2 ZERO LINE
plus CO2 ZERO ALARM (250ppm by default) value for 3
consecutive reactions, a “12_HIGH CO2 IN O2” fault is logged in
the fault archive and the system stops.
 The purpose of this function is to monitor the operation of the
oxygen concentrator. If the oxygen concentrator fails, then the
oxygen purity will be reduced and CO
2
at atmospheric levels
(≈400ppm) will enter the BioTector, and will be detected by the
CO
2
analyzer. It is important not to run the BioTector with a
faulty oxygen concentrator as eventually water could enter the
BioTector with the contaminated oxygen gas which may cause
damage on the Mass Flow Controller.