: ::: :: :

PP2000 and PP2000T SEM Cryo Preparation System Site Requirements

Mains electricity

Ensure that a suitable mains electricity supply (110 Vac or 240 Vac, frequency 50/60 Hz) is available. Check that the voltage label attached to the side of the cabinet is suitable for the local voltage and frequency.

A complete PP2000 Cryoprep installation will require four separate mains power outlets of 10A (240v) and 20A (110v). If the optional PP7690 Film thickness monitor accessory is fitted an additional mains power outlet will be required. (Note, PP7690 may be powered from integral interlocked output on PP7480 Control unit rear panel). Mains supply should be on a separate circuit from the SEM.

Gases

The following gas supplies are required:

Nitrogen gas

Two x 250 cubic foot cylinders of dry nitrogen gas (ZERO grade <3 vpm H2O) with regulators, to operate in the pressure range 0-15 psi (0-1 Kg cm -2 , 0-1 bar). The first cylinder is required for the intermittent venting and slushing functions.

The second cylinder is required for cooling the SEM stage and SEM anticontaminator. During cryo-SEM operation flow will be continuous. NOTE: If the optional pressurised dewar (PP7450) is specified, then only one nitrogen gas cylinder will be required for venting purposes only.

Argon gas

One 250 cubic foot cylinder of dry argon gas (ZERO grade) with regulator, to operate in the pressure range 0-15psi (0-1 Kg cm -2 , 0-1 bar). This gas is used when sputter coating, this size cylinder should last approximately 6 months provided the cylinder is turned off after use.

Note: The PP2000T system is supplied with a 1 lire canister of spectrographically pure argon sputtering gas. This should be used for high-resolution applications.

Liquid nitrogen

It is convenient to have a 160 litre bulk storage dewar of liquid nitrogen which can be used to fill 1 or 5 litre dewar containers for subsequently filling both dewars on the PP 2000/ / PP2000T system and the slusher chamber.