Sennheiser EM 3731-II - 09-09 Instruction Manual download pdf (Page 29)

Page 25 Leica EM CPD030 Operating Manual 09/09

5.10 Releasing gaseous C02 from the specimen chamber

After reaching the critical point, the gaseous C02 must be released from the

specimen chamber.

Close the gas dosing METERING VALVE. Carefully turn the valve clockwise until it

stops. Do not turn the valve too tight.

If the valve is closed too tightly, the valve can be damaged.

Screw the connecting tube of the flow meter to the outlet GAS OUT, if this has not

already been done during installation.

Press the GAS OUT key. LED GAS OUT lights up.

Open the METERING VALVE just enough to let the ball of the flow meter float in the

upper half of the measuring tube. Re-adjust the valve if the pressure decreases.

Decrease of pressure in the specimen chamber can be observed on the pressure

gauge. Atmospheric pressure should be reached in about 10 minutes. After that the

specimen pressure chamber can be opened.

The gas should NOT be released too quickly. If the pressure drops too fast,

the gaseous transition medium will condense due to the cooling caused by

expansion. This will become visible by the formation of fog in the specimen

pressure chamber. In this case a previously dried specimen can no longer be

used.

After the gaseous transition medium has been released, press the HEATING key to

switch off the heating. Close the METERING VALVE by turning it clockwise. Do not

turn the valve too tight.

Press the GAS OUT key. LED GAS OUT goes off.

Metering

valve

GAS OUT

key

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Sennheiser EM 3731-II - 09-09 Instruction Manual Page 29