HT16B (ANSI16/ISO5000 inlet) diffusion pump is designed for all light and heavy duty industrial applications. The robust construction gives high pumping speed at high pressure.

Features and Benefits

  • Highest throughput of comparative sized pumps
  • Earliest crossover pressure of similar sized pumps
  • Excellent maximum backing line pressure and tolerance to gas surges
  • Comparative pumping speed to similar sized pumps
  • Integral cold cap for best performance and low backstreaming
  • Self fractionating for low ultimate pressures
  • Easy change heater assembly
  • Half power energy saving standby mode
  • Oil level sight glass fitted as standard


  • Vacuum metallurgy
  • Distillation, drying and degassing
  • Thin film coating and metallizing
  • Large-scale research
Technical data  
Comparative pumping speed 11580 ls-1
ISO pumping speed†  
Nitrogen 6500 ls-1
Helium 7200 ls-1
AVS pumping  
Nitrogen 7220 ls-1
Helium 8000 ls-1
Maximum throughput (nitrogen) 18 mbar ls-1
  13.5 Torr ls-1
Critical backing pressure (DC704EU) 1.4 mbar
  1 Torr
Min backing pump displacement for max throughput 94 m3h-1
  55 ft3min-1
Recommended backing pump‡ GV80, GXS250, E2M175
Recommended fluid DC704
Fluid charge (dry) 2400 ml / 2.5 qt
Inlet/backing connection ANSI16/ANSI3 or ISO500/ISO100
Water connection 3/4 inch NPT female
Heater power 9 kW / 12 hp
Warm up time 60 min
Minimum cooling water flow at 25°C 700 l h-1 / 3.1 US gal min-1
Pressure drop across cooling water supply 1 bar / 14.5 psi
Weight 185 kg / 408 lbs

† ISO speed and throughout data obtained with total pressure measurement. Partial pressure readings typically increase data by ~30%. ISO speed measurements are typically 10% less than AVS measurements for the same pump.
‡ These are given for guidance