Thermo Scientific Surveyor UV Plus, Руководство по оборудованию

Страница: 51 / 76

3
Maintenance
Cleaning the Flow Cells
Thermo Scientific Surveyor UV/Vis Plus Detector Hardware Manual 35
Installing the Standard Analytical Flow Cell
 To install the standard analytical flow cell
1. With the inlet tube on the bottom left and the flow cell slot on top, slide the flow cell
assembly into the detector and under the alignment pin.
2. Replace the two flow cell assembly mounting screws.
3. Align the photodiode mount with the flow cell assembly so that the two holes with nylon
washers align with the photodiode mounting posts on the flow cell assembly.
4. Using the 9/64 in. hex driver, install the two photodiode mount retention screws.
5. Connect the inlet tubing to the chromatographic column and the outlet tubing to the
waste reservoir.
6. Replace the tubing retainer bracket and tighten the thumbscrew just enough to hold the
tubing in place.
7. Guide the tubing through the slots in the flow cell cover, and then securing the cover with
the flow cell cover mounting screw.
8. Connect the power cord to the power entry module on the detector’s back panel.
Cleaning the Flow Cells
The exterior and interior surfaces of the flow cell can become contaminated. Flow cell
contamination is usually caused by precipitation or by solubility problems, such as when the
quality of your mobile phase varies or the cleanliness of your samples varies. Signs of a
contaminated flow cell are increased baseline noise, signal spiking, erratic or drifting baselines,
low light intensity, or increased backpressure.
For other flow cell problems, such as a cracked window or leaks that occur in locations other
than at the inlet/outlet fittings, contact your Thermo Fisher Scientific service representative.
To clean the flow cell, follow these procedures:
• Cleaning the Flow Cell with Organic Solvents
• Cleaning the Flow Cell with Nitric Acid