Hach BioTector B3500s, Руководство пользователя

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Page 128
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 250ppm ▪ 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 (25 0ppm 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.
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 in
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 analysis cycles.
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.
SERVICE COUNTER 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.