Pumps - close-coupled

500 series close-coupled pumps

Overview

Close-coupled industrial pump

Watson-Marlow 521VI/RELC, 521I/RELC, 521F/RELC, 521FX/RELC: 0 bar to 2 bar IP55 pumps fitted with LoadSure® low-pressure element pumpheads.

521 close-coupled pumps offer IP55 ingress protection for industrial environments. They offer rugged, industrial pumping, with all the pumphead features of cased drives, but at the lowest whole-life cost.

  • 520REL low-pressure LoadSure element pumphead features large swept volume with sprung rollers for high accuracy
  • Chemically-resistant polyphenylene sulphide track and rotor, and stainless steel rollers and bearings
  • Low rotational speeds significantly increase tube life and system reliability
  • Clutched rotor for rapid, effortless tube loading
  • Rugged, tool-unlockable guard

Pumphead options available as standard (others available on request):

  • 520R and 520R2 pumpheads for continuous tubing
  • 520REL, 520REM and 520REH pumpheads for tube elements (for low, medium and high pressures)
  • 501RLCA and 501RL2CA ATEX pumpheads for continuous tubing

Drive options available:

  • 521VI integral inverter
  • 521F fixed speed
  • 521FX duplex fixed speed
  • 521I inverter controlled

Features and benefits

  • Flow rates up to 4,600 ml/min at 2 bar peak pressure with 520 LoadSure elements
  • 520RELC pumphead features PPS (Polyphenylene Sulphide) track and rotor with stainless steel occlusion rollers to resist chemical attack and abrasive wear
  • Heavy-duty pumphead construction with impact-proof safeguard
  • Sprung rotor gently compresses tubing using large low friction rollers with sealed bearings, guaranteeing long tube life and accurate metering
  • Fast and simple pumphead set-up using a clutched rotor for effortless element loading

Technical summary

Max. flow rate4600 ml/min
Min. flow rate 2.6 ml/min
Max. flow rate73 USGPH
Min. flow rate0.04 USGPH
Max. operating pressure7 bar
Max. operating pressure100 psi
Ambient Temperature Range5 °C to 40 °C
Ambient Temperature Range41 °F to 104 °F
Motor typesAC electric motor 
Min. operating speed60 rpm
Max. operating speed291 rpm
StandardsATEX 2014/34/EU, ATEX II 2G Ex h IIB T4 Gb X, CE 
Ingress ProtectionIP55 
Weight10 - 20 kg
Power supply400 V 50 Hz 3 ph 

Technical Summary table lists features available within the range. See ‘Specifications’ tab for model specific information.

Performance

Specifications

Literature

Drives

Pumpheads

Order Information

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