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Cleaning, Maintenance, Cleaning the exterior – Gilson 402 User Manual

Page 86: Cleaning the valve

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6-2

Maintenance

6

Cleaning

Cleaning

Cleaning the Exterior

The instrument cover and front panel may be cleaned.

Ensure that the instrument is switched OFF and the

power cord is removed when you clean the instrument.

When you need to clean the instrument, use one of

the three following methods:
1) A clean dry cloth.

2) A cloth dampened with water.

3) A cloth dampened with soapy water.

If a cloth dampened with soapy water is used to

clean the instrument, only domestic soap may be

used. No other form of detergent or chemical may

be used.

Parts in the liquid flow path may be cleaned with

ethanol or bleach (10 % Sodium Hypochlorite).

Cleaning the Valve

The valve must be cleaned after using the 402 with

corrosive or hazardous liquids, if leakage has

occurred, or if liquid flows back into the waste

tubing, or if the dilutor has been left unused for a

while after pumping alcohol based liquids. The

valve must be dis-mounted from the 402 and

separated from the syringe, then disassembled. The

valve can then be cleaned or autoclaved. It is not

necessary to autoclave the valve axle or the spring.

The surfaces of the ceramic

stator and rotor inside 402’s

valve are treated to give

optimum airtight operation. If

the valve has been used with

alcohol based liquids, and then

left unused for a while, a

grinding noise may be heard

during valve switching the

next time the pump is used.

This is because of friction

between the ceramic surfaces.

To correct this problem, you

should disassemble the valve

and clean the ceramic surfaces

with a damp cloth.

Dismounting the Valve

1) Disconnect all tubings from the valve.
2) Separate the syringe from the valve.
3) Undo the two screws securing the valve to the

402 front plate and remove the valve.

Disassembling the Valve

Hold the valve body firmly in one hand, undo the

valve axle guide, using a 17 mm open ended spanner.

Separate the axle guide from the body of the valve.