Hach BioTector B3500ul User Manual

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 150ppm
▪ 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 (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.
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.

Hach BioTector B3500ul Specifications

General

Brand	Hach
Model	BioTector B3500ul
Category	Measuring Instruments
Language	English