nES Single Stage Ex Series Rotary Vane Pumps

Protection in explosive environments

Protection in explosive environments

Equipped with sensors to protect your pump

nES pumps are equipped with sensors to measure pump temperature, oil level and pressure in oil casing. They are also equipped with PTC motor thermistors for motor and overcurrent protection.

Internal mechanism designed for low temperatures

You are guaranteed a class-leading ultimate vacuum level without pressure fluctuations. The mechanism is designed to ensure minimal hotspots within the pump.

Ideal for a wide range of applications

If your application includes an explosive environment, the nES is the ideal pump. It is suitable for use in the chemical, pharmaceutical, degassing, automotive and gas vapour recovery industries. Edwards’ applications team can help you identify the ideal use of the nES pump for your application.

Equipped with ATEX compatible accessories

  • ATEX rated exhaust mist filter
  • FPM seals
  • Oil filter bypass
  • ATEX rated motor and coupling
  • Approved oil
  • Gas ballast facility

Technical specifications

  Units nES40ex nES65ex nES100ex nES200ex nES300ex nES630ex
Maxmimum Dispplacement 50Hz m³h-1/cfm 44.0 / 25.9 59.0 / 34.8 98.0 / 57.4 180 / 106 280 / 165 700 / 412
Maxmimum Dispplacement 60Hz m³h-1/cfm 53.0 / 31.2 71.0 / 41.8 117 / 68.9 220 / 130 340 / 200 840 / 494
Pumping Speed (50 Hz) m³h-1/cfm 38.5 / 22.7 54.0 / 31.8 87.5 / 51.5 170 / 100 240 / 141 640 / 377
Pumping Speed (60 Hz) m³h-1/cfm 47.0 / 27.7 64.0 / 37.7 105 / 61.8 200 / 118 290 / 171 755 / 444
Ultimate vacuum (totale pressure)
no gas ballast
mbar / torr 0.5 / 0.4 0.5 / 0.4 0.5 / 0.4 0.15 / 0.13 0.15 / 0.13 0.15 / 0.13
Ultimate vacuum (totale pressure)
with gas ballast
mbar / torr 1.5 / 1.1 1.5 / 1.1 1.5 / 1.1 0.7 / 0.5 0.7 / 0.5 0.7 / 0.5
Inlet Connection ISO / ANSI DN40 / 1"1/2 ANSI DN40 / 1"1/2 ANSI DN40 / 1"1/2 ANSI DN50 / ANSI 2" DN50 / ANSI 2" DN100 / ANSI 4"
Outlet Connection ISO / ANSI DN40 / 1"1/2 ANSI DN40 / 1"1/2 ANSI DN40 / 1"1/2 ANSI DN50 / ANSI 2" DN50 / ANSI 2" DN100 / ANSI 4"
Max permitted outlet pressure bar gauge 1.15 abs 1.15 abs 1.15 abs 1.15 abs 1.15 abs 1.15 abs
Max water vapour pumping rate (50Hz) kgh-1/lbh-1 0.76 / 0.80 1.0 / 1.1 1.60 / 1.69 3.4 / 3.6 1.3 / 1.4 17 / 18
Max water vapour pumping rate (60Hz) kgh-1/lbh-1 0.90 / 0.95 1.25 / 1.32 1.70 / 1.80 5.4 / 5.7 1.8 / 1.9 24 / 25
Dimenstions (L, W, H) mm 686 / 356/ 303 748 / 386/ 349 810 / 434 / 319 1084 / 535/ 435 1143 / 573 / 450 1566 / 989 / 740
Weight kg / lb 67 / 148 86 / 190 104 / 230 142 / 313 244 / 539 695 / 1534
Motor Protection rating   IP55 IP55 IP55 IP55 IP55 IP65
Motor Power (50Hz) kW / hp 1.5 / 2.0 2.2 / 3.0 3.0 / 5.0 5.5 / 8 7.5 / 10 18.5 / 26
Motor Power (60Hz) kW / hp 1.8 / 3.0 2.6 / 4.0 3.6 / 6.0 6.6 / 10 9 / 13 21 / 30
Noise level (50Hz) dB(A) 58 60 61 69 72 72
Noise level (60Hz) dB(A) 60 64 64 73 76 75
Oil Refill Capacity litre 1 2 2 5 - 9 8.5 - 11.5 20 - 23
Recommended oil Ultragrade Endurance Extend 110
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