Calibrate; Shut Down The System - Hach QuikChem 8500 2 Series Operations

Set the sampler timing
When possible, set the sampler timing at the values specified in the Lachat method. Do the steps
that follow when less sample is necessary for the analysis.
1. Decrease the sample period.
2. Examine the new Run Timing setting with dye. Refer to
If either of these conditions occur, the computer will show an error message:
• The Sample Period plus Minimum Probe in Wash Period is longer than the Method Cycle
Period
• The Load plus Injection Period is longer than the Method Cycle Period

Calibrate

After the manifold installation, refer to the QuikChem method for the calibration details.
1. Set the power to on. Make sure that all system components are set to on.
2. Open the Omnion software.
3. Open a run file.
4. Prepare the reagents.
5. Install the manifold.
6. Flush deionized water through the manifold.
7. Look for leaks on the system. If no leaks are found, operate the system with reagents.
8. Prepare the calibration standards.
9. Install the calibration standards and the samples on the sampler.
10. Prepare the concentration in Run properties>Samples.
11. Start the run with the calibration standards and samples.
12. After the analysis is complete, print/export the report. For print options, refer to the online help.
13. Start the shutdown procedure to rinse the system. Refer to

Shut down the system

1. To use a manifold with a column, such as the cadmium column for nitrate, make the column
offline. Set the switching valve to the bypass position. If the manifold has a column, but does not
have a switching valve, set the pump power to off and replace the column with a piece of Teflon
tubing. Start the pump.
Note: Some methods make it necessary for some reagents (typically, the buffer) to be removed last. Look at
the QuikChem method for instructions.
2. Remove the reagent tubing from each reagent and rinse the tubing and glass weights. Keep the
lines and weights in rinse solutions.
3. If the QuikChem method recommends a rinse solution, install all reagent transmission tubing in
the solution and operate the pump for five minutes at standard speed.
Note: This is a critical step in the preventive maintenance of the manifolds.
4. Install the transmission tubing in deionized water and let the system rinse for 10 minutes at
standard speed.
5. If the manifold will not be used for more than three days or it is removed and kept in storage:
a. Remove the transmission tubing from the deionized water.
b. Use the pump to remove all liquid from the manifold.
6. Set the power to the pump to off. Release the pump tube cartridges.
7. Close all files on the computer.
Prepare a universal dye
Shut down the system
on page 12.
on page 13.
English 13