Pumps - close-coupled

500 series close-coupled industrial pumps

Arrange a demo
Arrange a demo

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 to 40 °C
Ambient Temperature Range41 to 104 °F
Motor typesAC electric motor 
Min. operating speed60 rpm
Max. operating speed291 rpm
StandardsATEX 2014/34/EU, CE, EX II 2G Exh IIB T4 G6 X 
Ingress ProtectionIP55 
Weight10 - 20 kg
Power supply400V 50Hz 3 ph 

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

Share

Performance

521F with RC pumphead performance

Tube bore and flow rates (ml/min)
Tube Material Speed (rpm) 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm 9.6mm
Neoprene, Sta-Pure, Chem-Sure, Tygon, Platinum-cured silicone 60 26 110 240 420 660 950
213 94 370 840 1500 2300 3400
291 130 510 1200 2000 3200 4600
Marprene/Bioprene TL 60 25 100 230 400 630 910
213 89 360 810 1400 2200 3200
291 120 490 1100 2000 3100 4400

521F with R2C pumphead performance

Tube bore and flow rates (ml/min)
Tube Material Speed (rpm) 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm 9.6mm
Neoprene, Sta-Pure, Chem-Sure, Tygon, Platinum-cured silicone 60 26 110 240 420 660 950
213 94 370 840 1500 2300 3400
291 130 510 1200 2000 3200 4600
Marprene/Bioprene TL 60 25 100 230 400 630 910
213 89 360 810 1400 2200 3200
291 120 490 1100 2000 3100 4400

521F with RELC pumphead performance

LoadSure® Element tubing flow rates (ml/min)
Tube Material Speed (rpm) 3.2mm 6.4mm 9.6mm
Pumpsil, Sta-Pure PCS, Sta-Pure PFL, Neoprene 60 110 420 950
213 370 1500 3400
275 450 1800 4100
291 510 2000 4600
Marprene TL, Bioprene TL 60 100 400 910
213 360 1400 3200
275 430 1700 3900
291 490 2000 4400

521F with REMC pumphead performance

LoadSure® element tubing flow rates (ml/min)
Tube material Speed (rpm) 3.2mm 6.4mm
Marprene TM, Bioprene TM 60 100 400
213 360 1400
257 430 1700
291 490 2000
Sta-Pure PCS, STA-PURE PFL 60 110 420
213 370 1500
257 450 1800
291 510 2000

521F with REHC pumphead performance

LoadSure® element tubing flow rates (ml/min)
Tube material Speed (rpm) 3.2mm
Marprene TH, Bioprene TH, Sta-Pure PCS 6-60 12-120
21-213 43-440
29-291 59-600
257 53-530

501DF with RLA (ATEX) pumphead performance

Tube bore and flow rates (ml/min)
Speed range (rpm) 0.5mm 0.8mm 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm
62 2.6 7.6 26 120 250 390 620
223 9.3 27 95 410 900 1400 2200
281 12 34 120 520 1100 1800 2800
6 to 62* 0.25-2.6 0.74-7.6 2.6-26 11-120 24-250 38-390 60-620
22 to 223* 0.92-9.3 2.7-27 9.4-95 41-410 89-900 140-1400 220-2200
28 to 281* 1.2-12 3.4-34 12-120 52-520 110-1100 180-1800 280-2800

*10:1 speed reduction available using a variable frequency inverter located in a safe area

501DF with RL2A (ATEX) pumphead performance

Tube bore and flow rates (ml/min)
Speed range (rpm) 0.5mm 0.8mm 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm
62 2.6 7.6 26 120 250 390 620
223 9.3 27 95 410 900 1400 2200
281 12 34 120 520 1100 1800 2800
6 to 62* 0.25-2.6 0.74-7.6 2.6-26 11-120 24-250 38-390 60-620
22 to 223* 0.92-9.3 2.7-27 9.4-95 41-410 89-900 140-1400 220-2200
28 to 281* 1.2-12 3.4-34 12-120 52-520 110-1100 180-1800 280-2800

*10:1 speed reduction available using a variable frequency inverter located in a safe area

Specifications

Technical specifications

521F with RC pumphead521F with R2C pumphead521F with RELC pumphead521F with REMC pumphead521F with REHC pumphead501DF with RLA (ATEX) pumphead501DF with RL2A (ATEX) pumphead
Max. flow rate4600 ml/min4600 ml/min4600 ml/min2000 ml/min600 ml/min2800 ml/min2800 ml/min
Min. flow rate 2.6 ml/min2.6 ml/min110 ml/min100 ml/min120 ml/min2.6 ml/min2.6 ml/min
Max. flow rate73 USGPH73 USGPH
Min. flow rate0.04 USGPH0.04 USGPH
Max. operating pressure2 bar2 bar2 bar4 bar7 bar2 bar2 bar
Max. operating pressure30 psi30 psi30 psi60 psi100 psi30 psi30 psi
Ambient Temperature Range5 to 40 °C5 to 40 °C5 to 40 °C5 to 40 °C5 to 40 °C5 to 40 °C5 to 40 °C
Ambient Temperature Range41 to 104 °F41 to 104 °F41 to 104 °F41 to 104 °F41 to 104 °F41 to 104 °F41 to 104 °F
Fluid temperature range -20 to 80 °C-20 to 80 °C-20 to 80 °C-20 to 80 °C-20 to 80 °C-20 to 65 °C-20 to 65 °C
Fluid temperature range -4 to 175 °F-4 to 175 °F-4 to 175 °F-4 to 175 °F-4 to 175 °F-4 to 149 °F-4 to 149 °F
Motor typesAC electric motor AC electric motor AC electric motor AC electric motor AC electric motor AC electric motor AC electric motor 
Min. operating speed60 rpm62 rpm223 rpm
Max. operating speed291 rpm291 rpm291 rpm291 rpm291 rpm281 rpm281 rpm
StandardsCE CE CE CE CE ATEX 2014/34/EU, CE, EX II 2G Exh IIB T4 G6 X ATEX 2014/34/EU, CE, EX II 2G Exh IIB T4 G6 X 
Ingress ProtectionIP55 IP55 IP55 IP55 IP55 IP55 IP55 
Noise<70dBb(A) at 1m <70dBb(A) at 1m <70dBb(A) at 1m <70dBb(A) at 1m <70dBb(A) at 1m <70dB(A) at 1m <70dB(A) at 1m 
Weight10 - 15 kg10 - 15 kg10 - 15 kg10 - 15 kg10 - 15 kg15 - 20 kg15 - 20 kg
Weight22 - 33 lbs22 - 33 lbs22 - 33 lbs22 - 33 lbs22 - 33 lbs33 - 44 lbs33 - 44 lbs
Power supply400V 50Hz 3 ph 400V 50Hz 3 ph 400V 50Hz 3 ph 400V 50Hz 3 ph 400V 50Hz 3 ph 400V 50Hz 3 ph 400V 50Hz 3 ph 
Compatible tubing bore size 0.5, 0.8, 1.6, 3.2, 4.8, 6.4, 8, 9.6 mm0.5, 0.8, 1.6, 3.2, 4.8, 6.4, 8, 9.6 mm3.2, 6.4, 9.6 mm3.2, 6.4 mm3.2 mm0.5, 0.8, 1.6, 2.4, 3.2, 4.8, 6.4, 8 mm1.6, 3.2, 4.8, 6.4, 8 mm
Compatible tubing wall thickness 1.6 mm2.4 mm1.6 mm2.4 mm

Table lists details for fixed speed pumps. For more detail on drive, AC motor and inverter options please contact your local Watson-Marlow Fluid Technology Solutions representative.

Fluid temperature values dependent on tubing material.

521F with RC pumphead dimensions

521F with RELC pumphead dimensions

501DF with RLA (ATEX) pumphead dimensions

501DF with RL2A (ATEX) pumphead dimensions

Materials of construction

BearingsStainless steel
Drain port assemblyHytrel, PP (polypropylene)
GearboxCast iron
Guide roller assemblyAcetal copolymer (Kematal), Stainless steel
Fluid connectorsPP (polypropylene), PVDF
MotorAluminum, Cast aluminum alloy
Mounting plate assemblyAluminum
Pumphead guardCarbon painted polycarbonate, Polycarbonate (PC)
Pumphead rotor assemblyChromium plated zinc alloy, Polyphenylene sulphide (PPS), Stainless steel 303S31, Stainless steel 316, Stainless steel DIN 17224
Pumphead trackGlass filled PPS (polyphenylene sulphide), Powder coated zinc alloy
SealsNeoprene
Tube clamp assemblyAcetal copolymer (Kematal), Chromium plated zinc alloy, Stainless steel 301S21

Information listed covers the complete range of fixed speed pumps. For detailed specifications of individual models/components and other drive/pumphead options, refer to user manual or contact your local Watson-Marlow Fluid Technology Solutions representative.

Literature

Brochures

  1. Tunnel boring (EN).pdf
    PDF - 1.8mb
  2. Brewing industry (EN).pdf
    PDF - 210.3kb

Datasheet

  1. 501DF with RL2A (ATEX) pumphead datasheet (US).pdf
    PDF - 1003.7kb
  2. 521F with R2C pumphead datasheet (US).pdf
    PDF - 995.4kb
  3. 521F with RC pumphead datasheet (US).pdf
    PDF - 1mb
  4. 521F with RELC pumphead datasheet (US).pdf
    PDF - 839.4kb
  5. 501DF with RLA (ATEX) datasheet (US).pdf
    PDF - 1006.4kb
  6. 521F with REMC pumphead datasheet (US).pdf
    PDF - 827.9kb
  7. 521F with REHC pumphead datasheet (US).pdf
    PDF - 704kb

Manuals

  1. 521CC manual (EN).pdf
    PDF - 835.6kb
  2. 501CC, 621CC and 701CC ATEX manual (EN).pdf
    PDF - 1.8mb
  3. 501RLA ATEX manual (EN).pdf
    PDF - 3.4mb

Drives

521VI integral inverter close-coupled drives bring variable speed control, constant torque output and total reliability to the industrial environment. The drive offers 400 V three-phase, plus 110 V and 230 V single-phase power options.

  • Integral inverter offering three speed ranges: 6 rpm to 60 rpm, 21 rpm to 215 rpm and 29 rpm to 291 rpm
  • Integral inverter control: Local/forward/stop/reverse control and remote, analogue and digital options.

521F fixed speed drives are 400 V three-phase powered

  • There is a choice of speeds: 60 rpm, 213 rpm and 291 rpm
  • Flow rates from 2.5 ml/min to 4,600 ml/min
  • Other speeds are available on request, please contact your local Watson Marlow Fluid Technology Group representative

521FX duplex fixed speed drives have twin pumpheads allowing two-channel pumping.

  • There is a choice of speeds: 55 rpm and 183 rpm
  • Twin 520 pumpheads for balanced flow in two channels

521I inverter-controlled, variable speed drives include a stand-alone inverter to control pump speed.

  • Inverter can be mounted beside the pump or remotely
  • Three speed ranges: 6 rpm to 60 rpm; 21 rpm to 213 rpm; 29 rpm to 291 rpm

Pumpheads

520REL LoadSure low-pressure pumphead

520REL LoadSure tube element pumphead offers up to 2 bar (30 psi) pressure and flow rates up to 3,500 ml/min.

Low-pressure elements are available in Marprene TL, Bioprene TL, Pumpsil, GORE STA-PURE PCS and GORE STA-PURE PFL with quick-release industrial or sanitary connectors.

520REM LoadSure medium-pressure pumphead

520REM LoadSure element pumphead offers up to 4 bar (60 psi) pressure and flow rates up to 1,500 ml/min.

Medium-pressure elements are available in Marprene TM, Bioprene TM, GORE STA-PURE PCS and GORE STA-PURE PFL with quick-release industrial or sanitary connectors.

520REH LoadSure high-pressure pumphead

520REH LoadSure element pumphead offers up to 7 bar (100 psi) pressure and flow rates up to 1,500 ml/min.

High-pressure elements are available in Marprene TH, Bioprene TH, and GORE STA-PURE PCS with quick-release industrial or sanitary connectors

520R2 continuous tubing pumphead

The 520R2 pumphead is designed for continuous tubing with a wall thickness of 2.4 mm. It offers up to 2 bar (30 psi) pressure and flow rates from 0.25 ml/min to 4660 ml/min.

2.4 mm wall tubing is available in five alternative materials for almost any chemical requirement, in tube sizes ranging from 0.5 mm up to 9.6 mm internal diameter.

520R continuous tubing pumphead

The 520R pumphead is designed for continuous tubing with a wall thickness of 1.6 mm. It offers up to 2 bar (30 psi) pressure and flow rates from 0.25 ml/min to 3000 ml/min.

1.6 mm wall tubing is available in eight alternative materials for almost any chemical requirement, in tube sizes ranging from 0.5 mm up to 8.0 mm internal diameter.

501RLCA ATEX continuous tubing pumphead

The 501RLCA is designed for continuous tubing with a wall thickness of 1.6 mm.

The 501RLCA pumphead is intended for use in areas which explosive atmospheres caused by gases, vapors or mists are likely to occur occasionally. ATEX rating for the pumphead 11 2G Exh IIB T4 G6 X.

501RL2CA ATEX continuous tubing pumphead

The 501RL2CA is designed for continuous tubing with a wall thickness of 2.4 mm.

Order Information

Product codes

521F with R2C pumphead product codes

Pump and pumphead product codes
Description Partcode
521F/R2C 60rpm pump 050.8122.2L0
521F/R2C 213rpm pump 050.8152.2L0
521F/R2C 291rpm pump 050.8172.2L0
520R2C pumphead 053.1031.2L0
Tubing product codes
Tubing bore/wall (mm) Bioprene Marprene Platinum Silicone STA-PURE PCS Chem-Sure®
1.6 / 2.4 933.0016.024 902.0016.024 913.A016.024 960.0016.024 965.0016.024
3.2 / 2.4 933.0032.024 902.0032.024 913.A032.024 960.0032.024 965.0032.024
4.8 / 2.4 933.0048.024 902.0048.024 913.A048.024 960.0048.024 965.0048.024
6.4 / 2.4 933.0064.024 902.0064.024 913.A064.024 960.0064.024 965.0064.024
8.0 / 2.4 933.0080.024 902.0080.024 913.A080.024 960.0080.024 965.0080.024
9.6 / 2.4 933.0096.024 902.0096.024 913.A096.024

521F with RELC pumphead product codes

Pump and pumphead product codes
Description Partcode
521F/RELC 60rpm pump 050.8122.EL0
521F/RELC 213rpm pump 050.8152.EL0
521F/RELC 291rpm pump 050.8172.EL0
520RELC pumphead 053.1031.EL0
Element product codes
Industrial LoadSure® elements, Quick-release PVDF connectors Sanitary LoadSure® elements, 3/4 in Sanitary PVDF connectors
3.2mm 6.4mm 9.6mm 3.2mm 6.4mm 9.6mm
Marprene TL 902.0032.PFQ 902.0064.PFQ 902.0096.PFQ
Pumpsil 913.A032.PFQ 913.A064.PFQ 913.A096.PFQ 913.A032.PFT 913.A064.PFT 913.A096.PFT
Neoprene 920.0032.PFQ 920.0064.PFQ 920.0096.PFQ
STA-PURE PFL 965.0032.PFQ 965.0064.PFQ 965.0096.PFQ 965.0032.PFT 965.0064.PFT 965.0096.PFT
Bioprene TL 933.0032.PFT 933.0064.PFT 933.0096.PFT
STA-PURE PCS 960.0032.PFT 960.0064.PFT 960.0096.PFT

521F with REMC pumphead product codes

Pump and pumphead product codes
Description Partcode
521F/REMC 60rpm pump 050.8122.EM0
521F/REMC 213rpm pump 050.8152.EM0
521F/REMC 291rpm pump 050.8172.EM0
520REMC pumphead 053.1031.EM0
Element product codes
Industrial LoadSure® elements, Quick-release PVDF connectors Sanitary LoadSure® elements, 3/4 in Sanitary PVDF connectors
3.2mm 6.4mm 3.2mm 6.4mm
Marprene TM 902.P032.PFQ 902.P064.PFQ
STA-PURE PFL 965.M032.PFQ 965.M064.PFQ 965.M032.PFT 965.M064.PFT
Bioprene TM 933.P032.PFT 933.P064.PFT
Sta-Pure PCS 960.M032.PFT 960.M064.PFT

521F with REHC pumphead product codes

Pump and pumphead product codes
Description Partcode
521F/REHC 60rpm pump 050.8122.EH0
521F/REHC 213rpm pump 050.8152.EH0
521F/REHC 291rpm pump 050.8172.EH0
520REHC pumphead 053.1031.EH0
Element product codes
Industrial LoadSure® elements, Quick-release PVDF connectors Sanitary LoadSure® elements, 3/4 in Sanitary PVDF connectors
3.2mm 3.2mm
Marprene TH 902.H032.PFQ
Bioprene TH 933.H032.PFT
Sta-Pure PCS 960.H032.PFQ 960.H032.PFT

501DF with RLA (ATEX) pumphead product codes

ATEX pump Speed (rpm) Motor Product code
501DF/RLA ATEX pump c/w PTC’s plated for inverter use 62 400V 50Hz 3ph 0.18kW 050.8622.L00
223 400V 50Hz 3ph 0.18kW 050.8652.L00
281 400V 50Hz 3ph 0.18kW 050.8672.L00

10:1 speed reduction available using variable frequency inverter, located in a safe area

ATEX pumphead Description Product code
501RLA Close coupled pumphead for 1.6mm wall thickness tubing 053.0002.A00
501RLGA Close coupled pumphead for 1.6mm wall thickness STA-PURE tubing 053.0022.A0G

501DF with RL2A (ATEX) pumphead product codes

ATEX pump Speed (rpm) Motor Product code
501DF/RL2A ATEX pump c/w PTC’s plated for inverter use 62 400V 50Hz 3ph 0.18kW 050.8622.L20
223 400V 50Hz 3ph 0.18kW 050.8652.L20
281 400V 50Hz 3ph 0.18kW 050.8672.L20

10:1 speed reduction available using variable frequency inverter, located in a safe area

ATEX pumphead Description Product code
501RL2A Close coupled pumphead for 2.4mm wall thickness tubing 053.0002.A20
501RL2GA Close coupled pumphead for 2.4mm wall thickness STA-PURE tubing 053.0022.A2G

Recommended Products

  1. Marprene tubing

    Marprene tubing

    Thermoplastic elastomer tubing especially resistant to oxidizing agents. 23 ºF to 176 ºF to 100 psi.

    Tubing - peristaltic

Related Products

Our process pump specialists are here to help you succeed.

To order a product or ask a question

Contact our experts