Watson Marlow Pumps 521CC User manual

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WATSON-MARLOW BREDEL E-MANUALS
PB0339gb-03
Watson-Marlow 521CC
p
um
p
s
Contents
1. Declaration of conformity
2. Declaration of incorporation
3. Warranty
3.1 One year warranty - 521P/RC
and 521P/R2C models with air
motors
3.2 Two year warranty - 521CC
models with electric motors
4. Information for returning pumps
5. Peristaltic pumps - an overview
6. Safety notes
7. Dimensions
8. Unit installation
9. AC three-phase motors
9.1 AC three-phase motor wiring
9.2 AC three-phase troubleshooting
9.3 AC three-phase motors:
maintenance
9.4 Gearbox maintenance - simplex
(single pumphead) units
9.5 Gearbox maintenance - duplex
(twin pumphead) units
9.6 AC three-phase motors: pump
specifications
10. Varmeca drives
10.1 Installation
10.2 Connections
10.3 Cables and protection devices
10.4 Commissioning / start-up
10.5 Single phase connection
diagram
10.6 Keypad indicator light display
10.7 Specifications
10.8 Inverter factory settings
10.9 Care and maintenance
11. Air motors
11.1 Installation
11.2 Lubrication
11.3 Operation
11.4 Starting
11.5 Shutdown procedure
11.6 Specifications
11.7 Troubleshooting
12. 520RC, 520R2C and 520REC pumpheads
12.1 520RC, 520R2C and 520REC key
safety information
12.2 520RC, 520R2C and 520REC:
good pump installation practice
12.3 520RC, 520R2C and 520REC:
pumphead position, removal and
replacement
13. 520RC, 520R2C and 520REC installation
13.1 Opening the pumphead guard
13.2 520RC and 520R2C tube loading
13.3 520REC: fitting the drain port
13.4 520REC element loading
13.5 520REC element connection
14. 520RC, 520R2C and 520REC
maintenance
15. 520RC, 520R2C and 520REC rotor
settings
16. Pumphead spares
17. Flow rates
18. Tubing and element part numbers
19. 520 series pumping accessories
20. Trademarks
21. Patient-connected use: warning
22. Publication history
23. Decontamination certificate
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1 Declaration of conformity
2 Declaration of incorporation
When this pump unit is to be installed into a machine or is to be assembled with other
machines for installations, it must not be put into service until the relevant machinery has
been declared in conformity with the Machinery Directive 2006/42/EC.
Responsible person: Christopher Gadsden, Managing Director, Watson-Marlow Limited,
Falmouth, Cornwall TR11 4RU, England. Telephone [phone] Fax [phone]
376009.
The information in this user guide is believed to be correct at the time of publication.
However, Watson-Marlow Limited accepts no liability for errors or omissions. Watson-
Marlow Bredel has a policy of continuous product improvement, and reserves the right to
alter specifications without notice. This manual is intended for use only with the pump it
was issued with. Earlier or later models may differ. The most up-to-date manuals appear on
the Watson-Marlow website: http://www.watson-marlow.com
When this pump unit is used as a stand alone pump it complies with: Machinery
Directive 2006/42/EC, EMC Directive 2004/108/EC.
Product codes used in this manual
CC Close-coupled
FFixed speed
DF, FD Hazardous atmosphere fixed speed
PPneumatic variable speed
PD Pneumatic variable speed with duplex gearbox
I, V Stand-alone inverter driven
VI Varmeca IP55 integrated inverter driven
DFX, DFD Hazardous atmosphere fixed speed with duplex gearbox
FX, FD Fixed speed with duplex gearbox
RC 520RC 1.6mm wall tubing two-roller pumphead for close-coupled drives
R2C 520R2C 2.4mm wall tubing two-roller pumphead for close-coupled drives
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3 Warranty
3.1 One year warranty - 521P/RC and 521P/R2C models
with air motors
Watson-Marlow Limited warrants, subject to the conditions below, through either Watson-
Marlow Limited, its subsidiaries, or its authorised distributors, to repair or replace free of
charge, any part of this product which fails within one year of delivery of the product to the
end user. Such failure must have occurred because of defect in material or workmanship
and not as a result of operation of the product other than in accordance with the
instructions given in this manual.
3.2 Two year warranty - 521CC models with electric
motors
Watson-Marlow Limited warrants, subject to the conditions below, through either Watson-
Marlow Limited, its subsidiaries, or its authorised distributors, to repair or replace free of
charge, any part of this product which fails within two years of delivery of the product to the
end user. Such failure must have occurred because of defect in material or workmanship
and not as a result of operation of the product other than in accordance with the
instructions given in this manual.
Conditions of and specific exceptions to the above warranties are:
Tubing as a consumable item is excluded.
Products must be returned by pre-arrangement carriage paid to Watson-Marlow Limited,
its subsidiaries, or its authorised distributor.
All repairs or modifications must have been made by Watson-Marlow Limited, its
subsidiaries or its authorised distributors or with the express permission of Watson-
Marlow Limited, its subsidiaries, or its authorised distributors.
Products which have been abused, misused, or subjected to malicious or accidental
damage or electrical surge are excluded.
Warranties purporting to be on behalf of Watson-Marlow Limited made by any person,
including representatives of Watson-Marlow Limited, its subsidiaries, or its distributors,
which do not accord with the terms of this warranty shall not be binding upon Watson-
Marlow Limited unless expressly approved in writing by a Director or Manager of Watson-
Marlow Limited.
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4 Information for returning pumps
Equipment which has been contaminated with, or exposed to, body fluids, toxic chemicals
or any other substance hazardous to health must be decontaminated before it is returned to
Watson-Marlow or its distributor. A certificate included at the rear of these operating
instructions, or signed statement, must be attached to the outside of the shipping carton.
This certificate is required even if the pump is unused. If the pump has been used, the
fluids that have been in contact with the pump and the cleaning procedure must be
specified along with a statement that the equipment has been decontaminated.
5 Peristaltic pumps - an overview
Peristaltic pumps are the simplest possible pump, with no valves, seals or glands to clog or
corrode. The fluid contacts only the bore of a tube, eliminating the risk of the pump
contaminating the fluid, or the fluid contaminating the pump. Peristaltic pumps can operate
dry without risk.
How they work
A compressible tube is squeezed between a roller and a track on an arc of a circle, creating
a seal at the point of contact. As the roller advances along the tube, the seal also advances.
After the roller has passed, the tube returns to its original shape, creating a partial vacuum
which is filled by fluid drawn from the inlet port.
Before the roller reaches the end of the track, a second roller compresses the tube at the
start of the track, isolating a packet of fluid between the compression points. As the first
roller leaves the track, the second continues to advance, expelling the packet of fluid
through the pump's discharge port. At the same time, a new partial vacuum is created
behind the second roller into which more fluid is drawn from the inlet port.
Backflow and siphoning do not occur, and the pump effectively seals the tube when it is
inactive. No valves are needed.
The principle may be demonstrated by squeezing a soft tube between thumb and finger and
sliding it along: fluid is expelled from one end of the tube while more is drawn in at the
other.
Animal digestive tracts function in a similar way.
Suitable applications
Peristaltic pumping is ideal for most fluids, including viscous, shear-sensitive, corrosive and
abrasive fluids, and those containing suspended solids. They are especially useful for
pumping operations where hygiene is important.
Peristaltic pumps operate on the positive displacement principle. They are particularly
suitable for metering, dosing and dispensing applications. Pumps are easy to install, simple
to operate and inexpensive to maintain.
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6 Safety notes
In the interests of safety, this pump and the tubing selected should only be used by
competent, suitably trained personnel after they have read and understood this manual,
and considered any hazard involved. Any person who is involved in the installation or
maintenance of this equipment should be fully competent to carry out the work. In the UK
this person should also be familiar with the Health and Safety at Work Act 1974.
This symbol, used on the pump and in this manual, means: Caution, risk
of electric shock.
This symbol, used on the pump and in this manual, means: Caution, refer
to accompanying documents.
This symbol, used on the pump and in this manual, means: Do not allow
fingers to contact moving parts.
This symbol, used on the pump and in this manual, means: Recycle this
product under the terms of the EU Waste Electrical and Electronic
Equipment (WEEE) Directive.
Fundamental work with regard to lifting, transportation,
installation, starting-up, maintenance and repair should be
performed by qualified personnel only. No voltage must be
applied while work is being carried out on the geared motor.
The motor must be secured against accidental start-up.
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7 Dimensions
521F/RC, 521F/R2C, 521DF/RLA, 521DF/RL2A
521VI/RC, 521VI/R2C
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Note: The pumphead fitted to the 521DFX is the 501RLA, not he 520RC as shown here.
521P/RC, 521P/R2C
521DFX/RLA, 521DFX/RL2A
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8 Unit installation
Site the pump on a flat, horizontal, vibration-proof surface. allowing a free flow of air
around it. Ensure that there is 1m of straight, flexible tubing before the pumphead inlet and
after the pumphead outlet. Close-coupled simplex pumps must be bolted down with four M8
bolts through the gearbox foot mounting holes. The pumphead will need to be removed
before locating the bolts. See section 17: 520RC and 520R2C maintenance.
Duplex pumps are baseplate-mounted as standard.
The pump may be set up so that the direction of rotor rotation is clockwise or anti-
clockwise, whichever is convenient. Please note, however, that tube life will be greater if
the rotor rotates clockwise; and that performance against pressure will be maximised if the
rotor rotates anti-clockwise.
9 Standard AC three-phase motors (integrated)
9.1 AC (IEC) three-phase motors: motor wiring
For Nema C face motors or other options follow manufacturers' guidelines.
Ensure that
the mains
voltage and
frequency
are in
accordance
with the
motor
nameplate
information.
Secure
protective
conductor
connections.
If the motor
runs in the
wrong
direction for
your needs,
interchange
any two
phases.
Close the terminal box and unused cable entrance holes in a dust-tight and watertight
manner, ensuring that the IP55 protection is maintained.
A current overload relay should be fitted to a contact-breaker appropriate to the current
rating of the motor. Connect the motor in accordance with the wiring diagram in the
motor terminal box.
When a thermal protection switch is fitted in the motor, the leads will be found in the
motor terminal box. They should be connected to open the circuit and stop the pump if
an over-temperature condition occurs.
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See the drawing below for drive motor connections, showing possible ancillary switches
and connections.
The ancillary switches should be rated to 220/240V 1ph 50Hz/60Hz. The Start contact
should have a sprung return which will disengage following energisation of coils C1 and
C1/1.
Ensure that an emergency stop switch is fitted within reach of the pump.
Do not under any circumstances wire switches directly across any of the
phases of a three-phase supply. If in doubt disconnect the pump
immediately.
Do not connect ancillary switches to the terminal box of a flame-proof
motor unless the switch has a suitable hazardous-atmosphere rating for
the area in which it is to be mounted.
AC three-phase motors must be connected to a suitable earth
terminal. It is imperative that the equipment is powered via an
isolating device and a circuit-breaking device (power contactor)
which can be controlled by an external safety system (emergency
stop, fault detector).
Correct installation and use of an AC three-phase motor with a suitably
rated frequency inverter is the responsibility of the user and should be
carried out by qualified personnel only.
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9.2 AC three-phase motors: troubleshooting
If the pump will not start make the following checks to determine whether servicing is
required:
Check that mains power is available to the pump.
Check that the motor is connected in the correct Star/Delta configuration.
Check that the pump is not stalled by incorrect fitting of tubing.
9.3 AC three-phase motors: maintenance
Thoroughly clean and regrease the motor assembly every 10,000 working hours or after
two years at the latest.
Remove any dust deposits from the fan cover to avoid overheating.
Dismount anti-friction bearings for cleaning and refill with a grease such as BP
Energrease LS 2 or Mobil Mobilux 2.
Ensure that the bearing cage is packed about 1/3 full with an evenly distributed
lubricating grease such as BP Energrease LS 2 or Mobil Mobilux 2.
9.4 AC three-phase motors: gearbox maintenance -
simplex (single pumphead) units
Combine a lubricant change with a thorough cleaning of the gear unit every 10,000
working hours or after two years at the latest.
Extreme working conditions (high air humidity, aggressive media and large temperature
variations) will reduce the interval between lubricant changes.
The first oil change should be carried out after approximately 1,000 working hours to
compensate for run-in abrasion. Examples of suitable lubricating oils are BP Energol GR-
XP 220 and Mobil Mobilgear 630.
9.5 AC three-phase motors: gearbox maintenance -
duplex (twin pumphead) units
The gearbox is filled for life with synthetic lubricant so no maintenance is required.
Always check to ensure that a hazardous atmosphere motor gearbox is
suitably rated for the hazardous zone area in which it is to be mounted.
Hazardous atmosphere motors should be installed only by qualified
personnel.
Any deviation from normal operating conditions (increased power
consumption, temperature, vibrations, noise) or warning signals by
monitoring equipment suggest malfunction. Inform the responsible
maintenance personnel at once. If in doubt disconnect the pump
immediately.
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9.6 AC three-phase motors: gearbox maintenance -
pump specifications
Control range See motor nameplate
Voltage/frequency See motor nameplate
Power consumption See motor nameplate
Full load current See motor nameplate
Operating temperature range 5C to 40C, 41F to 104F
Storage temperature range -40C to 70C, -40F to 158F
Noise <70dB(A) at 1m
Standards BS EN60529 (IP55)
Machinery directive 2006/42/EC
EMC directive 2004/108/EC
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10 Varmeca drives
The Varmeca drive is an IP65 integrated electronically-variable speed drive fitted to a
standard enclosure IP55 motor gearbox. Standard Varmeca drives are single-phase but
three-phase Varmecas are available.
Standard Varmeca drives are set up for manual control with the run command enabled.
Current will be applied directly to the motor as soon as mains power is switched on.
Subsequently, speed, direction of rotation and stop control can be achieved from the control
knob and keypad.
For information on how to set up the Varmeca for remote control, please refer to
the Leroy Somer Varmeca-30 manual.
The Varmeca-30 is fitted with safety devices which stop the motor in the event of a fault.
The motor can become jammed for mechanical reasons. Voltage fluctuations and power
cuts may also stop the motor.
Removing the cause of a shutdown can lead to restarting, which may be dangerous for
certain installations. It is essential that the user guards against the motor restarting after
shutdown, if this is undesirable.
10.1 Varmeca drives: installation
The standard Varmeca integrated drive requires no connection other than to the mains
power supply.
The Varmeca motor fan cools the whole unit. Make sure that the ventilation air inlet is
free of obstruction.
It is the responsibility of the owner or user to ensure that the installation, operation and
maintenance of the inverter complies with health and safety regulations of the relevant
country of use.
10.2 Varmeca drives: connections
The voltages on the power terminal blocks and the cables connected to them may cause
fatal electric shocks. The drive stop function does not protect against these high
voltages.
The drive power supply must be protected against overloads and short circuits.
It is vital to respect the rating of protection devices.
Connections should be made with copper conductors only.
This Varmeca-30 must be connected to an approved earth terminal.
It is imperative that the equipment is powered via an isolating
device and a circuit-breaking device (power contactor) which can
be controlled by an external safety system (emergency stop, fault
detector).
Before carrying out any work, disconnect and lock the drive power
supply. For single phase units, wait two minutes to make sure that
the capacitors have fully discharged. After connection work, make
sure that the seals are firmly in place, and the screws and cable
glands are watertight to ensure IP65 protection. Clear any
condensation from the drain holes at the bottom of the motor.
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10.3 Varmeca drives: cables and protection devices
Circuit breakers must be of the D-curve type suitable for a motor with an inverter.
Comply with the size of protection (gl) fuses given in the table below.
The cable size may vary according to legislation applicable in the country of use, which
will take precedence over the values given in the table below without exception.
NB: The mains current value is a typical value which depends upon the source impedance.
The higher the impedance, the lower the current. The fuses (UL approved) are intended for
installations capable of delivering 5,000A maximum at 480V.
10.4 Varmeca drives: commissioning / start-up
Remove the cover and connect a suitably rated mains cable via the cable gland to
connection points L1, L2 and PE (earth) of the Varmeca terminal block.
Secure the connection cover and cable gland into position, ensuring that the IP65 sealing
is not compromised.
Power-up at the mains: the green indicator lamp lights and remains on continuously.
Start rotation by pressing a direction button for one second.
Set the speed reference using the side control knob, adjusting speed between 10Hz and
80Hz. The speed control knob is calibrated in percentages of maximum speed.
Press the Stop button to stop the unit.
Varmeca drives fitted with electrical interlock pumpheads
Commissioning / start-up: as standard Varmeca units.
If the guard switch is activated:
Press the Stop button twice to reset the unit after the pumphead guard has been closed
Re-start rotation by pressing a direction button for one second
Power VMA
rating
Current
(A)
gl fuses or circuit
breaker (A)
Cable
(sq mm)
230V/1/50/60Hz
0.25kW
1/3HP
A or B
21M-025
3.5 8 1.5
110V/1/50/60Hz
0.25kW
1/3HP
A or B
21M-025
6.8 16 2.5
The Varmeca must not be switched on with the connection cover
removed.
The motor Run command has been enabled: the motor will start as
soon as it is switched on.
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10.5 Varmeca drives: single phase connection diagram
10.6 Varmeca drives: keypad indicator light display
Before switching on the Varmeca-30 motor, check that
electrical connections are correct and that any moving parts
are mechanically protected. The Varmeca-30 must not be
switched on with the protective cover removed.
Steady green light Mains connected
Flashing green light Motor current overload
Flashing green and red lights Motor current limit
Flashing red light Fault: under/over voltage
Steady red light Fault: short circuit; locked motor rotor; faulty winding
insulation; I²t overheating; or internal fault
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10.7 Varmeca drives: Varmeca-30 specifications
Power supply Single phase, 208V -10% to 240V +10%, 50/60Hz
±2%
110V -10% to 120V +10%, 50/60Hz ±2%
Power range 0.25kW, 1/3HP
Maximum hourly mains
stop/starts
10
Overload 150% of nominal current for 60 seconds, 10 times
per hour
Efficiency 97.5% motor efficiency
Filter type Class B EMC filter (domestic and light industrial level)
Motor frequency variation range 10Hz-80Hz at constant torque
Enclosure IP65: Varmeca drive; IP55: motor
Storage temperature -40C to +70C (IEC 68.2.1), -40F to 158F
Operating temperature -20C to 50C, -4F to 122F; power derated by 1% per
degree C above 40C, 1% per 1.8 degrees F above
104F
Altitude Up to 1000m without derating
UL standard Conforming to UL508c (E211799)
Weight 21kg, 46lb
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10.8 Varmeca inverter factory settings
The Watson-Marlow 521VI/RC and 521VI/R2C inverter default settings are listed in the
table below. For more information on each parameter and its options, consult the Leroy-
Somer Varmeca-30 operating instructions.
10.9 Varmeca care and maintenance

T
emperature variations and excessive humidity encourage the formation of condensation.
If this occurs, the condensation drain plugs at the bottom of the motor should be
removed, even in a very humid atmosphere.
No specific servicing is required for Varmeca-30 motors, apart from regularly removing
dust from the fan grille and the cooling fins at the bottom of the unit.
Dismantling the Varmeca-30 while it is under warranty will invalidate the warranty.
Parameter Set
value
Possible
settings
P01 F MIN 8 8Hz
P02 REF 0V -
4mA
8 8Hz
P03 F MAX 80 80Hz
P04 REF 10V -
20mA
80 80Hz
P05 ACCEL 3 3s
P06 DECEL 3 3s
P07 STOP
MODE
RAMP RAMP
P08 Un MOT 400V 400V
P09 FN MOT 50Hz 50Hz
P10 U / F C C: 0.25-1.1kW;
D: 1.5-7.5kW
P11 BOOST 8% Adapted to
motor according
to power
P12
OVERBOOST
20% Adapted to
motor according
to power
P13 F PWM 11 11: 0.25-2.2kW;
8: 3-4kW
P14 CONFIG Standard
Standard
Parameter Set
value
Possible
settings
P15 VP1-1 50Hz
P16 VP2-1
VP1-2
60Hz
P17 VP2 40Hz
P18 VP3-2 70Hz
P19
ROTATION
FORWARD FORWARD
P20 SELECT
3
OUTPUT N
P21 PI K PRO 10
P22 PI K INT 10
P23 F MOT -
P24 I MOT -
P25 FAULT 0
P26 STOP F
min
0
P27 LOG
CDC-VMA
-
P28 CAL MOT 21M
025:520
Adapted
according to
motor power
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11 Air motors
11.1 Air motors: installation
The air motor is supplied with a silencer installed. The silencer incorporates a speed limiter.
Install a moisture trap and filter in the air line ahead of the motor. If condensates need to
be flushed out of the motor, use clean, dry air at low pressure. For efficiency of output and
speed control, use air lines of the same size or next pipe size larger than the intake port of
the motor.
A four-way valve which can be connected by piping to both air ports of the motor will make
reversing possible. Use a pressure regulator or a simple shut-off valve to obtain the desired
power and conserve air to regulate speed and torque. The motor should be regulated to
run at no more than 3000rpm.
The air motor should be mounted on a solid baseplate, preferably of metal, which in turn
should be anchored to a shelf, floor or other machinery.
11.2 Air motors: lubrication
Use a detergent SAE#10 automotive engine oil. Lubrication is necessary for all moving
parts and rust prevention. We recommend that an automatic air lubricator be installed in
the air line just ahead of the motor.
Automatic lubrication: An in-line oiler should be adjusted to feed one drop per minute for
high speed or continuous duty use. Do not overfeed oil. Contamination of the exhaust air
may occur.
Manual lubrication: Shut the pump down after every eight hours of operation, and add
10-20 drops of oil through the inlet port.
The air motor is designed for air only. Do not allow corrosive,
flammable or explosive gases or particulate material to enter the
motor. Water vapour, oil-based contaminants or other liquids must
be filtered out. The recommended air pressure should not exceed
7bar (100 psig) maximum.
Always disconnect the air supply before servicing.
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11.3 Air motors: operation
11.4 Air motors: starting
Starting torque is less than running torque. It could vary depending on where the vanes
stop in relation to the air intake port. To regulate speed and torque, use a pressure
regulator or simple shut-off valve to obtain desired power and conserve air.
11.5 Air motors: shutdown procedure
Turn off the air supply and remove the air lines from the motor.
Use clean, dry air at low pressure to flush out condensates such as water.
Re-lubricate the air motor with a squirt of oil in the chamber. Rotate the shaft by hand
several times.
Plug or cap each port.
11.6 Air motors: Air motor specifications
11.7 Air motors: troubleshooting
Do not drive an air motor with flammable or explosive gases nor operate
the unit in an atmosphere containing them. Solid or liquid material
leaving the motor can cause eye or skin damage. Keep away from the air
stream. Do not drive an air motor in excess of the recommended speed,
which is governed by a limiter on the outlet port. Do not allow an air
motor to run at high speed with no load: excessive internal heat build-up,
loss of internal clearances and rapid motor damage will result.
Maximum
speed
Maximum
pressure
Maximum
torque
Maximum air
consumption
Total internal
end clearance
Total top
clearance
3,000rpm 7.0bar,
100psig
26Nm,
19.2 lb-ft
14.15 l/s, 30cfm 0.0635mm,
0.0025in
0.0381mm,
0.0015in
Reason Low
torque
Low
speed
Won't
run
Runs
hot
Runs well then
slows down
Dirt, foreign material
Internal rust
Misalignment
Insufficient air
pressure
Air line too small
Restricted exhaust
Poor lubrication
Jammed machine
Compressor too small
Compressor too far
from unit
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12 520RC, 520R2C and 520REC pumpheads
Identification of parts
12.1 520RC, 520R2C and 520REC key safety information
For close-coupled drives, ensure that the pump is isolated from the mains voltage.
Ensure that there is no pressure in the pipeline.
Primary operator protection from rotating parts of the pump is provided by the tool-
unlockable safeguard.
Secondary (backup) protection is available in the form of an electrical interlock which
stops the pump if the pumphead guard is opened (and only for so long as the guard is
opened). The electrical interlock on close-coupled pumps should never be used as
primary protection. Always disconnect the mains power supply to the pump before
opening the pumphead guard.
If a tube failure has occurred, ensure that any fluid in the pumphead has been allowed to
drain to a suitable vessel, container or drain.
Ensure that protective clothing and eye protection are worn if hazardous fluids are being
pumped.
1Guard latch 5Rotor cap 9Pumping roller
2Guard (520RC, 520R2C) 6Tube guide roller 10 Tube clamp slider (520RC, 520R2C)
3Track 7Rotor 11 Tube clamp (520RC, 520R2C)
4Clutch button cover 8Follower roller 12 Guard with seal (520REC)
13 Drain port (520REC)
Before opening the pumphead guard, ensure that the following
safety directions are followed.
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12.2 520RC, 520R2C and 520REC: good pump installation
practice
General recommendations
The pump may be set up so that the direction of rotor rotation is clockwise or counter-
clockwise, whichever is convenient. Please note, however, that for the 520R and 501RL
pumpheads tube life will be greater if the rotor rotates clockwise; and that performance
against pressure will be maximised if the rotor rotates counter-clockwise. To achieve 4 bar
and 7 bar pressures using a 520RE pump and the appropriate rotor and element, the pump
must rotate counter-clockwise.
Peristaltic pumps are self-priming and self-sealing against backflow. No valves are required
in inlet or discharge lines, except as described below. Valves in the process flow must be
opened before the pump operates. Users are advised to fit a pressure relief device between
the pump and any valve on the discharge side of the pump to protect against damage
caused by accidental operation with the discharge valve closed. Users of 520RE pumps at
pressures up to 4 bar and 7 bar are advised to fit a non-return valve between the pump and
the discharge pipework to avoid the sudden release of pressurised fluid in the unlikely event
of element failure.
Do keep delivery and suction tubes as short and direct as possible - though ideally not
shorter than 1m - and follow the straightest route. Use bends of large radius: at least four
times the tubing diameter. Any valves in the pipeline (not usually needed with a self-
priming peristaltic pump) must not restrict the flow.
Do use suction and delivery pipes equal to or larger than the bore of the tube in the
pumphead. When pumping viscous fluids use pipe runs with a bore several times larger
than the pump tube.
Do site the pump at or just below the level of the fluid to be pumped if possible. This will
ensure flooded suction and maximum pumping efficiency.
Do keep the pumphead track and all moving rollers clean and free from debris.
When using Marprene or Bioprene tubing, re-tension the tube after the first 30 minutes
of running.
Tube selection: The chemical compatibility list published in the Watson-Marlow catalogue
is only a guide. If in doubt about the compatibility of a tube material and the duty fluid,
request a Watson-Marlow tube sample card for immersion trials.
A correctly engineered installation will promote long tube life. Please ensure that these
guidelines are followed:
Avoid tight pipeline bends, pipe reducers and lengths of smaller bore tubing than the
pumphead section, particularly in pipelines on the suction side.
Ensure that at least 1m of smooth bore flexible tubing is connected to the discharge port
of the pumphead to help to minimise impulse losses and pulsation in the pipeline. This is
specially important with viscous fluids and when connecting to rigid pipework.
Ensure that connecting pipework and fittings are suitably rated to handle the predicted
pipeline pressure. If rigid pipework must be used close to the pumphead, a drop-out
section of pipe will simplify tube replacement.
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