Fault Setup - Hach BioTector B3500ul User Manual

8.3.8 Fault Setup

LOW O2 FLOW TIME
HIGH O2 FLOW TIME
BASE CO2 ALARM
CO2 ZERO LINE
CO2 ZERO ALARM
SERVICE COUNTER
12s ▪ If the O
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.
20s ▪ If the O
during any reaction phase for longer than the HIGH O2 FLOW
TIME (20s by default), a "03_HIGH O2 FLOW" fault is logged.
150ppm ▪ During the zero calibration & zero check reactions, system
monitors the CO
monitored value is higher than the programmed BASE CO2
ALARM level (150ppm by default), a "52_HIGH CO2 IN BASE"
warning is logged into the fault archive.
▪ In the event of a "52_HIGH CO2 IN BASE" warning, BioTector
generates the relevant Zero Adjust factors automatically, at the
end of a successfully completed Zero Calibration cycle.
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 in
ppm is used as the fixed CO
▪ For instance, if there is a CO
source or detector sections, a typical of 400ppm CO
environment will increase the CO2 ZERO LINE level to
≈250ppm within 24 days of online operation or approximately
after 5000 analysis cycles.
250ppm ▪ If the concentration of CO
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
(~400ppm) will enter the BioTector, and will be detected by the
CO
faulty oxygen concentrator as eventually water could enter the
BioTector with the contaminated oxygen gas, which may cause
damage on the Mass Flow Controller.
180 DAYS ▪ SERVICE COUNTER (180 days by default) specifies the
number of days the system operates before triggering an
"83_SERVICE TIME" warning.
▪ Note that the service counter keeps operating and decreases the
count by a day if system is powered up during the same day
even though system was not running. Because the default
factory setting is a typical value for normal site conditions, the
service interval may need to be adjusted according to specific
site conditions.
flow drops more than 50% of the MFC set value for
2
flow increases more than 50% of the MFC set value
2
peak level with the CO
2
zero line.
2
measured during the Analyzer Zero
2
analyzer. It is important not to run the BioTector with a
2
Analyzer. If the
2
leak into the CO analyzer's
2 2
level in the
2
at atmospheric levels
2
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