b31420200 - HT20B ANSI20/ANSI4, 200V

HT20B ANSI20/ANSI4, 200V

B31420200

Overview

The HT high throughput series is the pinnacle of our diffusion pump knowledge with technology aimed specifically at industrial users. Edwards diffusion pump is designed for all light and heavy duty industrial applications. The robust construction gives high pumping speed at high pressure. The cast and machined aluminium interior provides consistent performance, while the stainless steel body prevents corrosion and ensures process cleanliness. These pumps are designed to give a high throughput (pressure multiplied by pumping speed) at 4 × 10-3 mbar making them ideal for industrial processes that involve large quantities of gases.

Technology

Industrial applications require robustly constructed vapor pumps often with very high throughputs. Edwards provides a range of vapor diffusion pumps and vapor booster pumps to meet these needs. All industrial diffusion pumps are water-cooled.

All Edwards diffusion pumps are fully fractionating. This means that volatile components are fed to the lower stages of the vapor pump and the vapor fed to the inlet stage is stripped of these fractions. This improves ultimate vacuum. Cooled baffles above the pump help to prevent pump fluid condensing on the pump walls, which would prevent the pump attaining its ultimate vacuum. Baffles will also minimize backstreaming.

The ultimate vacuum obtainable with a diffusion pump is dependent upon the parameters of the system under evacuation. The outgassing from the system, its leak tightness, the vapor pressure of the pump fluid and the number of joints and elastomers used all contribute to the achievable vacuum. Additionally, in most industrial applications, the pumps throughput at a particular pressure is more important than obtaining a very low pressure. For these reasons we have elected not to quote an ultimate vacuum for our HT series industrial vapor diffusion pumps since it would not be meaningful.

Applications

  • Vacuum metallurgy
  • Distillation, drying and degassing
  • Thin film coating and metallizing
  • Large-scale research

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

Technical Data

Comparative pumping speed 18000 ls-1
ISO pumping speed†
Nitrogen 8000 ls-1
Helium 16000 ls-1
Max throughput (nitrogen) 24 mbar ls-1

18 Torr ls-1
Critical backing pressure (with DC704) 1.3 mbar /

1 Torr
Min backing pump displacement for max throughput 135 m3h-1

80 ft3min-1
Recommended backing pump‡ GXS250, E2M175
Recommended fluid DC704
Fluid charge (dry) 3600 ml / 3.8 qt
Inlet/backing connection ANSI20/ANSI4 or

ISO630/ISO160
Water connection 3/4 inch NPT female
Heater power 12.6 kW / 16.9 hp
Warm up time 60 min
Minimum cooling water flow at 25°C 960 l h-1 / 4.2 US gal min-1
Pressure drop across cooling water supply 1.2 bar / 17.4 psi
Weight 275 kg / 605 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, please contact Edwards for a recommendation of pump combinations best suited to your application.

Performance


1. Comparative pumping speeds from back to back testing
2. ISO pumping speed obtained using total pressure gauges
3. ISO throughput obtained using total pressure gauges

Dimensions

A. Electrical supply connector

B. Water inlet connector

C. Water outlet connector

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