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6
Routine Maintenance
Cleaning the External Surfaces of the Detector
Thermo Scientific
Surveyor PDA Plus Detector Hardware Manual
87
Cleaning the External Surfaces of the Detector
The external surfaces of the detector should be kept clean and dry. To clean the outside of the
detector, wipe with a dust-free cloth or a damp cloth (moistened with water only) to remove
dirt or stains.
Cleaning the LightPipe Flow Cell
This section describes the general cleaning of the detector’s LightPipe flow cell. For other
LightPipe flow cell problems, such as leaks that occur in locations other than at the
inlet/outlet fittings, contact your Thermo Fisher Scientific Service Representative.
The exterior and interior surfaces of the LightPipe 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 LightPipe are increased baseline noise, signal spiking, erratic or drifting
baselines, low light intensity, or increased backpressure.
This section contains the following procedures:
•
Removing the LightPipe Flow Cell
•
Cleaning the Flow Cell with Organic Solvents
•
Cleaning the Flow Cell with Nitric Acid
Removing the LightPipe Flow Cell
You need to remove the LightPipe flow cell from the Surveyor PDA Plus Detector to clean it.
To remove the LightPipe
1. Turn the detector power off, and disconnect the power cord from the back panel of the
detector.
2. Open the front doors of the detector.
3. Loosen the captive screw that secures the flow cell cover. Then remove the flow cell cover
(see
The LightPipe flow cell is located behind the flow cell cover (see
).
CAUTION
Do
not
disassemble the LightPipe housing or tighten the screws on the
housing. In addition, do not touch the optical fibers at the ends of the LightPipe. Doing
so damages the LightPipe flow cell. Thermo Fisher Scientific cannot be held responsible
for any damage done to the LightPipe by attempts to disassemble the housing or tighten
the screws. Contact your Thermo Fisher Scientific Service Representative with any
questions regarding LightPipe maintenance or service.