Hach BioTector B3500ul, Руководство пользователя

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Page 155
Check the air supply pressure. The set point pressure should be 1.5 bar (BioTector
compressor 1.2 bar). When the oxygen concentrator is running, the pressure typically cycles
from 1.5 bar to 0.9 bar. Check the O2 PRESSURE SENSOR reading looking at the O2-
Controller Status menu. The pressure should be 400 mbar (±10 mbar) at 20 l/h MFC flow.
See Section
8.1.6 Oxygen Controller Status for details.
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Using the Simulate menu (see Section 8.1.2 Simulate for details), check the operation of the
Mass Flow Controller (MFC) and confirm that the MFC is working at various flow set points.
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Check the BioTector for any gas/liquid leaks by running the PRESSURE TEST cycle using
the Process Test menu (see Section
8.1.1.1 Pressure Test for details). Check the gas flow
in the system by running the EXHAUST TEST and SAMPLE OUT TEST in Process Test,
Flow Test menu (see Section
8.1.1.2 Flow Test for details).
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Confirm all signals (4-20mA and volt free contacts) are signaling correctly to the external
control device.
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If necessary, go to Operation, Time & Date menu and adjust the time and the date. When the
system service is completed, go to Diagnostics, Service menu and select RESET SERVICE
COUNTER function (see Section
8.1.7 Service for details).
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Connect D
I Water to BioTector’s manual sample port and run 10 analysis cycles on DI Water
using the Manual Program menu to remove any TOC contamination due to service. (If
MANUAL port is not available, use SAMPLE 1 port, program the Sample Pump REVERSE
time to 0 “zero” seconds temporarily in Sample Pump menu, and start the analyzer using the
Operation menu). If necessary, run additional analysis on DI Water until TOC values become
stable.
Go to Calibration, Zero Calibration menu, and select the “RUN ZERO CALIBRATION”
function for the BioTector to set the Zero Adjust (zero offset) values automatically.
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(If necessary ultra-pure water, which should not contain more than 5ppb TOC, can be used
during the Zero Calibration cycle to adjust the zero offset. To run Zero Calibration using ultra-
pure water, go to Maintenance, System Configuration, Sequence Program, Zero Program
and set ZERO WATER to YES. See ZERO WATER in section
8.3.4.2 Zero Program for
details.)
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Program the concentration of the standard solution in the Span Calibration menu ( 2.3.2
Span Calibration ). The concentration of the calibration standard used must be typically
greater than 50% of the full scale of the RANGE the calibration is carried out. In order to see
BioTector calibrated ranges, see System Range Data screen (
2.2.3 System Range Data
Screen ).
(To prepare a standard solution, see procedures described in Section 6.2 Calibration
Standards
or information sheet “R009. Standard Solutions for BioTector Multi-component Analyzer”,
which is available inside the MMC/SD card shipped with the BioTector.)
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Connect the standard solution to the MANUAL/CALIBRATION port. If these ports are not
available, use the SAMPLE 1 port. It is recommended that the standard solution is located at
the same height as the sample chamber. The tubing length between the standard solution
and the BioTector MANUAL/CALIBRATION port should be between 2 and 2.5 meters. Run
the Span Calibration cycle using the RUN SPAN CALIBRATION function in Span Calibration
menu. A minimum of five complete analysis cycles is recommended for the span calibration.
Span Calibration cycle should be carried out only when stable zero readings are obtained
after a Zero Calibration cycle completed without any warnings. (
In systems using multiple
operation ranges, it is recommended to carry out a Span Check cycle at the other operation ranges
used and if necessary to adjust the span factor manually using the Span Calibration menu.
)
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To ensure that the correct zero offset is applied and to eliminate any remaining TOC
contamination from the analyzer, a Service Zero cycle should be initiated using the SET
SERVICE ZERO function in the Service menu. When initiated, BioTector automatically runs a
total of 10 zero calibration cycles during the following 500 online measurements and
automatically adjusts the zero offset values to compensate for the removal of the
contamination. It will therefore not be necessary to revisit the BioTector after the service or to
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