Veo Observer Plus Instruções de Operação descarregar pdf (Página 124)

Charged Aerosol Detectors

Corona Veo and Corona Veo RS

Page 116 Operating Instructions

8.7 Stream-Switching Valve (Corona Veo RS only)

Tip: When you perform maintenance procedures on the stream-switching valve, put

on a pair of clean room gloves to prevent contamination of detector parts.

8.7.1 Disassembling the Valve

1. Stop the detector operation:

a) Rinse out any harmful solvents from the detector. For information about

recommended wash procedures, see section 8.3.2 (→ page 111).

b) Turn off the mobile phase flow. Allow gas to flow for at least 5 minutes.

c) Turn off the gas flow. Wait several minutes for the detector to de-pressurize.

d) Turn off the gas supply to the detector.

e) Press the power switch on the detector rear panel to turn the detector off.

f) Disconnect the capillaries from the stream-switching valve.

2. Remove the socket head screws that secure the stator to the valve with a hexagon

wrench (9/64"). Loosen the screws alternately: Loosen each screw by only half a turn

at a time to avoid that the stator gets jammed.

3. Remove the stator from the valve body. To ensure that the sealing surface of the stator

cap is not damaged, place it on its outer face.

No. Description

1 Valve

2 Rotor

3 Stator

Fig. 25: Exploded view of the valve

4. Carefully remove the rotor seal with your hand or a small screwdriver.

5. Inspect the rotor and stator surfaces for scratches:

♦ If scratches are visible, the rotor and/or stator must be replaced.

♦ If no scratches are visible, clean all parts thoroughly with deionized water and a

microfiber cloth. Take care that no surfaces are scratched while you are cleaning the

components. After cleaning, it is not necessary to dry the rotor.

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