book > index > index H
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halogen leak detector 556
hard glass 638
HCFCs 525,552,558
heat conductivity 46
-, coefficient of 47,49,670
-, energy accommodation 50,52
-, energy accommodation coefficient 52,54
-, free-molecule 52,53
heat conductivity gauges 4,32,369,404
-, convection gauge 369,414
-, leak detection with 527,551
-, Pirani gauge 369,411
-, principle and operation 404
-, thermocouple gauge 369,415
heat of adsorption 64,77,81,85
-, in the case of chemical bond 85
-, in the case of physical bond 64
heat of evaporation 671
Helicoflex seal 583
helium 7,311,668,669,670,671
-, tracer gas for leak detection 532
helium leak detector 526,538
-, counterflow principle 540,542,567
-, main flow principle 540
-, mass spectrometer 538
-, reference leak 548
-, sensitivity 543,545,546
-, use of helium sniffer 552
helium sniffer 552
hexafluoropropylene, see ’Viton’
high pressure ion gauge 369,431
high pressure ion source 458
high temperature soldering, see ‘brazing’
high vacuum 4,368
HMP, see ‘hybrid molecular pump’
Ho-factor 206
Hoffmann 3
Holweck 238,272,280,280,301,303,306
hot cathode ionization gauge 369,416
-, Bayard-Alpert gauge 369,433
-, Blears effect 428
-, cathode, see ‘filaments’
-, conventional ion gauge 431
-, correction factor 425
-, cracking of oil vapour 428
-, degassing 425
-, electron-stimulated desorption 424
-, extractor gauge 369,437
-, high pressure ion gauge 369,431
-. ion pumping 426
-, ionization probability 419
-, Lafferty gauge 433,437
-, leak detection with 527,549
-, modulated Bayard-Alpert gauge 369,435
-, Morgulis formula 418
-, nitrogen equivalent pressure reading 425
-, oil vapour cracking processes 428
-, principle and operation 416
-, pumping action 426
-, sensitivity 417,422,434,435
-, summary of characteristics 430
-, water reaction 429
-, X-ray effect 423
hybrid molecular pump (HMP) 234,271,303
-, critical backing pressure 306
-, hybrid bearing 304
-, hydrocarbon-free vacuum 307
-, maximum compression 305
-, pump properties 307
-, with disc-MDP 303,306
-, with drum-MDP 304,305
hydrocarbon contamination 650,653
hydrocarbon-free vacuum 307,318,334,347
hydrocarbon oils 223
hydrocarbons 334,619,652
hydrochlorofluorocarbons, see ‘HCFCs’
hydrogen 6,668,669,670,671
hydrogen degassing 653
hydrogen leak detector 525,553
hydrogen/nitrogen mixture gas, see ‘shielding gas 95/5’
hydrogen sulphide 554
