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APPENDIX C. HEATER AND VACGENCOUPLES
C1. DESCRIPTION
Sample heating is normally by either:
* Resistance heating (HST option), or
* Electron bombardment heating (FBH option).
These heaters are intended for mounting onto the standard range of VACGEN sample holders (e.g.
SH1, SH1E50, SH2, SH2E50, SH2R64, SH2F, SH2RT, SM2T and SM2VT.)
Two VACGENcouples are provided with either heater module. These are available as either Type K
(Chromel-Alumel) or Type N (Nicrosil-Nisil). Type N is recommended where low magnetic
permeability is important. Temperature control is recommended, using:
* the RHC controller for the HST and
* the EBHC controller for the EBH
C2. WIRING DIAGRAMS
WARNING
: It is very dangerous to leave feedthrough contacts isolated, especially during bakeout and
when high voltages are present near to the sample. It is the responsibility of the user to be aware of
electrostatic charge buildup and to provide suitable earthing.
