Hach Lachat QuikChem In-Line Module Manual Del Usuario página 11

Operation
W A R N I N G
Chemical exposure hazard. Obey laboratory safety procedures and wear all of
the personal protective equipment appropriate to the chemicals that are handled.
Refer to the current material safety data sheets (MSDS) for safety protocols.
Set the temperature
Note: Do not make the temperature higher than 60 ºC (140 ºF) without water or
reagents in the tubing.
1. Push until the display shows SP (set point).
2. Push the UP or DOWN arrows to raise or lower the set point. The
display continues to show the SP mode.
3. When the temperature is set, push
memory.
4. Push once. The display shows the current temperature in
Celsius. A red light shows the heater is on.
5. Let the temperature stabilize.
Find the correct timing
To find the correct timing in the Omnion FIA:
Items to collect:
• Stop watch or other timer
• Dye (provided with the system) - red dye gives the best results
Note: Due to differences in the viscosity and boiling point of each reagent, do not
use water in place of reagents during the dye test.
1. Put some dye in a test tube.
2. Create a method in Omnion. Enter all valve timing parameters (cycle
period, sample reaches first valve, load period and inject period) and
sampler timing parameters.
3. Run the dye as a sample. Start the timer when the probe goes into
the test tube.
to save the information in
4. Follow the dye through the system. When the sample gets to Port
6 at the injection valve, stop the timer.
5. Record the time, which is the sample reaches first valve time. Make
sure to change this time in the valve timing of the method.
6. Save the method and run the dye again to measure the next
parameter.
7. Run the dye and follow it through the system. When the dye gets to
Port 6, start the timer. This is the instant when the valve toggles for
the first time.
8. When the sample slug gets to Port 6, stop the timer.
9. Record this time and subtract 5 seconds to get the load period that is
specified in the valve timing of the Omnion method.
• The cycle period is specified in the method (cycle period = load
period + inject period).
• The inject period is automatically set by the software once the
cycle period and load period are defined.
Calibrate the instrument
1. Put all reagent lines in their respective reagent bottles.
2. Put the standard solutions into the standard vials.
3. Refer to the analyzer user manual to start a calibration run.
Brackish timing in Omnion FIA
Some of the in-line methods make Brackish (or manual) integration
timing necessary. The QuikChem method shows when the brackish
timing is needed.
To learn more about how to set brackish timing, refer to the software
manual or search for the keywords graphical events programming or
brackish events in the Omnion help system.
Tips
• Do not use the stand-by speed of the peristaltic pump.
• Put reagent lines in deionized water to avoid wasting reagents.
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