Watson-Marlow 520DuN User Manual

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 1

WATSON-MARLOW BREDEL MANUALS

Watson-Marlow 520DuN
IP66/NEMA 4X pumps

m-520dun-4x-gb-05

Contents

1 Declaration of conformity 3
2 Declaration of incorporation 3
3 Five-year warranty 4
4 When you unpack your pump 5
5 Information for returning pumps 6
6 Peristaltic pumps: an overview 7
7 Safety notes 8
8 Pump specifications 10

8.1 Dimensions 15

9 Good pump installation practice 16

9.1 General recommendations 16

9.2 Do’s and do not’s 17

10 Connecting this product to a

power supply 18
11 Start-up check list 21
12 Switching the pump on for the

first time 21
13 Switching the pump on in

subsequent power cycles

(if not in auto-restart mode) 23
14 Manual operation 24

14.1 Keypad functions
in manual mode 24

14.2 Keypad lock 27

14.3 Keypad beep 27

14.4 Manual operation
and remote digital
inputs and outputs 27

15 Main menu 28

15.1 Keypad functions in
menu screens 28

15.2 Main menu entry 29

16 Pin-secure process protection 30
17 Calibrate 31
18 Setup 35

18.1 Trim 36

18.2 Analogue 37

18.3 Display 41

18.4 Pump number 42

18.5 Baud 42

18.6 Stop bits 43

18.7 Xon/Xoff 43

18.8 Flow units 44

18.9 Run time 45

18.10 Outputs 46

18.11 Remote stop 48

18.12 Auto-restart 50

18.13 Set maximum speed 51

18.14 Backlight 51

18.15 ROM 52

18.16 Language 52

18.17 Defaults 53

18.18 Beep 53

18.19 Security code 54

18.20 Exit 55
19 Pin-out details 55
20 MemoDose 56

20.1 Changing dosing speed 57

20.2 Footswitch operation

with MemoDose 58
21 Exit 58
22 Automatic control wiring 59

22.1 520N module fitting 59

22.2 Wiring up 61

22.3 Speed: analogue input 64

22.4 Scaling: analogue input 65

22.5 Speed: analogue output 66

22.6 Tachometer frequency
output 66

22.7 Run / stop input 67

22.8 Direction input 67

22.9 Auto / manual toggle 68

22.10 MemoDose input 68

22.11 Leak detection input 68

22.12 Outputs 1, 2, 3, 4 69

22.13 Supply voltages 69

22.14 RS485 input 70

23 Automatic control

and operation 71

24 Network control and operation 74

24.1 RS485 command strings 76

25 Troubleshooting 77

25.1 Error codes 78

26 Drive maintenance 79
27 Drive spares 79
28 The 520R, 520R2

and 520RE pumpheads 80

28.1 Pumphead position,
removal and replacement 81

29 520R, 520R2 and 520RE

installation 83

29.1 Opening the guard 83

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 2

29.2 520R and 520R2
tube loading 84

29.3 520RE: fitting the
drain port 85

29.4 520RE Element loading 86

29.5 520RE Element
connection 88

30 520R, 520R2 and 520RE

maintenance 89

31 520R, 520R2 and 520RE

rotor settings 90

32 Pumphead spares 91
33 Flow rates 92
34 Tubing and element

part numbers 100

35 520 series pumping

accessories 103
36 Trademarks 104
37 Patient-connected applications 104
38 Publication history 104
39 Decontamination certificate 105

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 3

1 Declaration of conformity

This declaration was issued for Watson-Marlow 720DuN pumps on May 1,

2007. When this pump unit is used as a stand-alone pump it complies
with: Machinery Directive 2006/42/EC, EMC Directive 2004/108/EC.

This pump is ETL listed: ETL control number 3050250. Cert to CAN/CSA
std C22.2 No 61010-1. Conforms to UL std 61010A-1.

See 8 Pump specifications.

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].

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

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 4

3 Five year warranty

520 cased pumps, 620 cased pumps and 720 cased pumps

For any 520, 620 or 720 cased pump purchased after 1 January 2007, Watson­Marlow Limited (“Watson-Marlow”) warrants, subject to the conditions and excep­tions below, through either Watson-Marlow, its subsidiaries, or its authorised distrib­utors, to repair or replace free of charge, any part of the product which fails within
five years of the day of manufacture of the product. 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 normal operation as defined in this pump manual.

Watson-Marlow shall not be liable for any loss, damage, or expense directly or indi­rectly related to or arising out of the use of its products, including damage or injury
caused to other products, machinery, buildings, or property, and Watson-Marlow
shall not be liable for consequential damages, including, without limitation, lost prof­its, loss of time, inconvenience, loss of product being pumped, and loss of produc­tion. This warranty does not obligate Watson-Marlow to bear any costs of removal,
installation, transportation, or other charges which may arise in connection with a
warranty claim.

Conditions of and specific exceptions to the above warranty are:

Conditions

 Products must be returned by pre-arrangement, carriage-paid, to Watson-

Marlow, or a Watson-Marlow approved service centre.

 All repairs or modifications must have been made by Watson-Marlow Limited,

or a Watson-Marlow approved service centre or with the express permission of
Watson-Marlow.

 Warranties purporting to be on behalf of Watson-Marlow made by any person,

including representatives of Watson-Marlow, its subsidiaries, or its distributors,
which do not accord with the terms of this warranty shall not be binding upon
Watson-Marlow unless expressly approved in writing by a Director or Manager
of Watson-Marlow.

Exceptions

 The warranty shall not apply to repairs or service necessitated by normal wear

and tear or for lack of reasonable and proper maintenance.

 All tubing and pumping elements as consumable items are excluded.
 Products which, in the judgment of Watson-Marlow, have been abused, mis-

used, or subjected to malicious or accidental damage or neglect are excluded.

 Electrical surge as a cause of failure is excluded.
 Chemical attack is excluded
 All pumphead rollers are excluded.
 The 620R family of pumpheads are excluded from all warranty when pumping

above 2 bar while above 165rpm.

 Pumpheads from the 313/314 and the Microcassette ranges and any 701

extension pumpheads are excluded and retain their one-year standard pump­head warranty. The drive they are attached to is subject to the five-year war­ranty as set out here.

 Ancillaries such as leak detectors are excluded.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 5

4 When you unpack your pump

Unpack all parts carefully, retaining the packaging until you are sure all components
are present and in good order. Check against the components supplied lists, below.

Packaging disposal

Dispose of packaging materials safely, and in accordance with regulations in your
area. Pay particular attention to the expanded polystyrene shockproof shells. The
outer carton is made of corrugated cardboard and can be recycled.

Inspection

Check that all components are present. Inspect components for damage in transit.
If anything is missing or damaged, contact your distributor immediately.

Components supplied (520DuN pump, IP66 NEMA 4X models)

 The 520DuN pump drive unit fitted with:

 520R2 or other pumphead (See 8 Pump specifications) if specified as a

pump

 A 520N module providing pump ingress protection to IP66, NEMA 4X.

Note: the module is attached for transit, but must be removed to allow
wiring up, voltage selection and fuse inspection and then re-affixed before
the pump is operated.

 The designated mains power lead for your pump
 PC-readable CDROM containing these operating instructions
 Quick Start manual

Note: Some versions of this product will include components different from those
listed above. Check against your purchase order.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 6

Storage

This product has an extended shelf life. However, care should be taken after storage
to ensure that all parts function correctly. Users should be aware that the pump con­tains a battery with an unused life of seven years. Long-term storage is not recom­mended for peristaltic pump tubing. Please observe the storage recommendations
and use-by dates which apply to tubing you may wish to bring into service after storage.

5 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. See 39 Decontamination certificate.

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.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 7

6 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.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 8

7 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. If the pump is used in a manner not
specified by Watson-Marlow Ltd, the protection provided by the pump may be
impaired.

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, 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 perfor med by qualified per­sonnel only. The unit must be isolated from mains power
while work is being carried out. The motor must be secured
against accidental start-up.

There is a user-replaceable type T2,5A H 250V
fuse in the fuseholder in the centre of the switch-

plate at the back of the pump. In some countries,
the mains power plug contains an additional replaceable fuse.
There is a fuse on the interface card which self-resets after
five seconds. There are no user-serviceable fuses or parts
inside this pump.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 9

There are moving parts inside the pumphead. Before opening the tool­unlockable pumphead guard, ensure that the following safety directions are fol-

lowed.

 Ensure that the pump is isolated from the mains power.
 Ensure that there is no pressure in the pipeline.
 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 pumped.

 Primary operator protection from rotating parts of the pump is provided by the

pumphead safeguard. Note that safeguards differ, depending on the type of
pumphead. See the 28 pumphead section of this manual.

This pump must be used only for its intended purpose.

The pump must be accessible at all times to facilitate operation and maintenance.
Access points must not be obstructed or blocked. Do not fit any devices to the drive
unit other than those tested and approved by Watson-Marlow. Doing so could lead
to injury to persons or damage to property for which no liability can be accepted.

If hazardous fluids are to be pumped, safety procedures specific to the particular
fluid and application must be put in place to protect against injury to persons.

The exterior surfaces of the pump may get hot during operation. Do not take hold
of the pump while it is running. Let it cool after use before handling it. The drive unit
must not be run without a pumphead fitted.

This product does not comply with the ATEX directive and
must not be used in explosive atmospheres.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 10

8 Pump specifications

Labels fixed to the rear of the pump contain manufacturer and contact details, prod­uct reference number, serial number and model details.

The same information is carried on the drive’s backplate, accessible when the 520N
module is removed.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 11

520DuN, IP66 NEMA 4X model

This pump can be controlled from the keypad or remotely. It features:

Manual control

Speed adjustment; run and stop; direction control; keypad scaling; “max” key
for rapid priming.

Remote control

The pump can be digitally controlled with a contact closure or logic input signal
to operate the pump.

Analogue control

The pump speed can be controlled through an analogue signal input in the
ranges 0-10V or 4-20mA. Scaling can be controlled similarly using Analogue
signal input 2.

RS485 serial communication

Full pump control from a PC or other controller with the ability to network up to
32 pumps.

Outputs

A 0-10V, 4-20mA or 0-1258Hz output signal provides feedback of the pump
speed. There are four relay status outputs which can be configured in software
for a variety of pump parameters.

MemoDose

Allows precise repeat dosing. Stores in memory a pulse count from the motor.
This count is repeated each time START is pressed to provide a single-shot
dose.

Calibration

Full calibration with default figures for a range of pumpheads and tubes.
Calibration dose facility.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 12

IP (Ingress Protection) and NEMA definitions

* 520N cased pumps are rated to NEMA 4X (indoor use) only.

IP NEMA

1st Digit 2nd Digit

3

Protected against
ingress of solid objects
with a diameter of
more than 2.5mm.
Tools, wires etc with a
thickness of more than

2.5mm are prevented
from approach

1

Protection against
dripping water falling
vertically. No harmful
effect must be
produced

2

Indoor use to provide a
degree of protection
against limited amounts
of falling water and dirt

5

Protected against
harmful dust deposits.
Ingress of dust is not
totally prevented but
the dust must not
enter in sufficient
quantity to interfere
with satisfactory
operation of the
equipment. Complete
protection against
contact

5

Protection against
water projected from a
nozzle against the
equipment (enclosure)
from any direction.
There must be no
harmful effect (water
jet)

12

Indoor use to provide a
degree of protection
against dust, falling dirt
and dripping, non­corrosive liquids

13

Indoor use to provide a
degree of protection
against dust and
spraying water, oil and
non-corrosive coolants

6

Protection against
ingress of dust (dust­tight). Complete
protection against
contact

6

Protection against
heavy seas or powerful
water jets. Water must
not enter the
equipment (enclosure)
in harmful quantities
(splashing over)

4X

Indoor or outdoor* use
to provide a degree of
protection against
splashing water, wind­blown dust and rain,
hose-directed water;
undamaged by the
formation of ice on the
enclosure. (Resist
corrosion: 200-hour salt
spray)

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 13

Pump specifications

Control range (turndown ratio) 0.1-360rpm (3,600:1)

Supply voltage/frequency

100-120V/200-240V 50/60Hz 1ph

Maximum voltage fluctuation

±10% of nominal voltage.

A well regulated electrical mains supply

is required along with cable connections

to the best practice of noise immunity

Installation category
(overvoltage category)

II

Power consumption 135VA

Full load current <0.6A at 230V; <1.25A at 115V

Eprom version Accessible through pump software

Enclosure rating

IP66 to BS EN 60529;

NEMA 4X to NEMA 250 *

Pumphead options

520R, 501RL, 313, 314, 505L,

505BA, 505CA, 314MC, 318MC

Operating temperature range 5C to 40C, 41F to 104F

Storage temperature range -40C to 70C, -40F to 158F

Maximum altitude 2,000m, 6,560ft

Humidity (non-condensing)

80% up to 31C, 88F, decreasing linearly

to 50% at 40C, 104F

Pollution degree 2

* Protect from prolonged UV exposure.

Note: 520 drive models are C ETL US listed. Cert to std CAN/CSA C22.2 No 1010-

92. Conforms to std UL 61010A-1 April 30, 2002.

Note: 520 drive models have been tested in accordance with BS EN 61000-6-2:
2001 (EN 61000-4-4) Fast Transient and Burst Tests to Industrial limits – ie: Level 3:
2kV.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 14

Standards

EC
harmonised
standards

Safety of machinery—electrical equipment of machines:

BS EN 60204-1

Safety requirements for electrical equipment for measurement,

control and laboratory use:

BS EN 61010-1 incorporating A2 Category 2, Pollution degree 2

Degrees of protection provided by enclosures (IP code):

BS EN 60529 amendments 1 and 2

Conducted emissions:

BS EN 55011 A1 and A2 Class A, called by BS EN61000-6-4

Radiated emissions:

BS EN 55011 A1 and A2 Class A, called by BS EN61000-6-4

Electrostatic discharge: BS EN 61000-4-2

Radiated RF immunity:

BS EN 61000-4-3 A1 and A2, called by BS EN 61000-6-2

Fast transient burst:

BS EN 61000-4-4 A1 and A2, Level 3 (2kV),

called by BS EN 61000-6-2

Surge immunity:

BS EN 61000-4-5 A1 and A2, called by BS EN 61000-6-2

Conducted RF immunity:

BS EN 61000-4-6, called by BS EN 61000-6-2

Voltage dips and interruptions:

BS EN 61000-4-11, called by BS EN 61000-6-2

Mains harmonics: BS EN 61000-3-2 A2

Pumps and pump units for liquids—common safety

requirements: BS EN 809

Other
standards

UL 61010A-1

CAN/CSA-C22.2 No 61010-1

Conducted emissions FCC 47CFR, Part 15.107

Radiated emissions FCC 47CFR, Part 15

NEMA 4X to NEMA 250 (indoor use) for IP66 products only

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 15

8.1 Dimensions

Unit weights

520DuN IP66/NEMA 4X model

Drive only + 520R, 520R2

+ 520REL,

520REM, 520REH

+ 505L

IP66 NEMA 4X

10.58kg

23lb 5oz

11.48kg

25lb 5oz

11.40kg

25lb 2oz

13.06kg

28lb 13oz

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 16

9 Good pump installation practice

9.1 General recommendations

A correctly engineered installation will promote long tube life. Site the pump on a
flat, horizontal, rigid surface, free from excessive vibration, to ensure correct lubri­cation of the gearbox. Allow a free flow of air around the pump to ensure that heat
can be dissipated. Ensure that the ambient temperature around the pump does not
exceed 40C.

The STOP key on the keypad will always stop the pump. However, it is recommend­ed that a suitable local emergency stop device is fitted into the mains supply to the
pump.

Do not stack pumps more than three high. When pumps are stacked, ensure that
the ambient temperature around all the pumps in the stack does not exceed 40C.

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.

9.2 Do’s and do not’s

Do not build a pump into a tight location without adequate airflow around the pump.

Do ensure that when the 520N watertight module is fitted the seals are intact and

properly located.

Do ensure that the holes for cable glands are properly sealed to maintain theIP66 /
NEMA 4X rating.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 17

Do not strap the control and mains power cables together.

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. Ensure that connecting pipework and fittings
are suitably rated to handle the predicted pipeline pressure. Avoid pipe reducers and
lengths of smaller bore tubing than the pumphead section, particularly in pipelines
on the suction side. Any valves in the pipeline (not usually needed with a self-prim­ing peristaltic pump) must not restrict the flow. Any valves in the flow line must be
open when the pump is running.

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 ensure that on longer tube runs at least 1m of smooth bore flexible tubing is con­nected to the inlet and discharge port of the pumphead to help to minimize impulse
losses and pulsation in the pipeline. This is especially important with viscous fluids
and when connecting to rigid pipework.

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 parts clean and free from contamina­tion and debris.

Do run at slow speed when pumping viscous fluids. When using the 520R pumphead,
a 6.4mm or 4.8mm bore tube with a 2.4mm wall will give best results. Tube smaller
than this will generate a high friction loss, so reducing the flow. Tube with a larger
bore may not have sufficient strength to restitute fully. Flooded suction will enhance
pumping performance in all cases, particularly for materials of a viscous nature.

Do recalibrate after changing pump tubes, fluid, or any connecting pipework. It is
also recommended that the pump is recalibrated periodically to maintain accuracy.

IP66 / NEMA 4X models may be hosed down, but should not be immersed. Protect
from prolonged UV exposure.

When using Marprene or Bioprene continuous tubing, do re-tension the tube
after the first 30 minutes of running.

Tube selection: The chemical compatibility lists published in Watson-Marlow pub­lications are guides. If in doubt about the compatibility of a tube material and the
duty fluid, request a Watson-Marlow tube sample card for immersion trials.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 18

10 Connecting this product
to a power supply

The voltage selector is mounted in the switchplate at
the rear of the pump, protected from water by the
520N module. The module must be removed to allow
access to the switchplate. See 22.1 520N module fit-
ting. Set the voltage selector to 115V for 100-120V
50/60Hz supplies or 230V for 200-240V 50/60Hz
supplies. Always check the voltage selector switch
before connecting the mains supply.

Make suitable connection to an earthed single-phase
mains electricity supply.

The voltage selector switch is not visible while the 520N
module is in place. Do not swith the pump on unless
you have checked that it is set to suit your power sup­ply by removing the module and inspecting the switch,

and then refitting the module. See 22.1 520N module fitting.

We recommend using commercially available supply
voltage surge suppression where there is excessive
electrical noise.

Power cable: The pump is supplied fitted

with a cable gland and approximately

2.8m of power cable. Recommended
cable: H05RN-F3G0.75; SJTW 105C 3­18AWG; max OD 8mm (5/16in).

This drawing shows the cable connections
from below with the interface card cover
removed.

Power cables of NEMA 4X specification
pumps are fitted with a standard US
mains power plug. IP66 specification
pumps are supplied with no plug. The
colour code for the power cable is: brown

- live; blue - neutral; green and yellow ­earth.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 19

If the mains power cable is inappropriate for your installation, it can be changed.
This operation can be carried out with the 520N module in place, or after it has been
removed, as shown here for clarity.

 Ensure that the pump is isolated from the mains power.

 Remove the six screws from the interface card cover underneath the pump. Lift

off the interface card cover. You may find it convenient to remove the cover
completely; if so, remove the cover earth lead.

 Undo the terminal block connectors. Remove the restraining clip by sliding its

jaws sideways in opposite directions.

 Loosen the cable gland using a 19mm wrench and remove the gland and the

cable.

 Thread a replacement cable through the three parts of the gland, the pump

case and the restraining clip. Connect the new cable to the block connectors,
following the drawing above.

 Tighten the restraining clip, and the gland to 2.5Nm. Check that the card cover

earth link is secure. Replace the card cover, checking that the earth wire is not
pinched beneath the cover lip. Take care that the sealing strip is properly seat­ed to ensure a seal.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 20

Input line fusing: type T2,5A H 250V

20mm time-delayed fuse, located in a
fuseholder in the centre of the switch­plate at the rear of the pump.

Power interruption: This pump has
an auto-restart feature which, when
active, will restore the pump to the
operating state it was in when power
was lost. See 18.12 Auto-restart.

Stop / start power cycles: Do not
power up/power down for more than
100 starts per hour, whether manually or
by means of the auto-restart facility. We
recommend remote control where a high
frequency of power cycles is required.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 21

11 Start-up check list

Note: See also 29.2 Tube loading.

 Ensure that proper connections are achieved between the pump tube and suc-

tion and discharge piping.

 Ensure proper connection has been made to a suitable power supply.
 Ensure that the recommendations in the section on 9 Good pump installation

practice are followed.

12 Switching the pump on for the
first time

Note: This manual uses bold type to highlight the active option in menu screens:

“English” in the first screen represented here. The active option appears on the
pump display in

inverse text.

 Switch on the power supply at the rear of the pump. The pump runs a power-

on test to confirm proper functioning of the memory and hardware. If a fault is
found, an error message is displayed. See 25.1 Error codes.

 The pump displays a language menu. Use the UP and DOWN keys to select

your language. Press the ENTER key to confirm your choice.
The information which follows assumes that your choice was English.
When the language is chosen this menu will not appear again and all menus
will appear in the language you chose. (Language can be reset as described
later. See 18.16 Language.)

 The pump displays the Watson-Marlow start-up screen for four seconds, fol-

lowed by the pump model identity screen for four seconds, and then the manu­al mode main screen.

 The rotation symbol on the display indicates clockwise rotation. The speed of

rotation is the pump’s maximum. Other initial start-up operational parameters
are listed in the table below.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 22

First-time start-up defaults

Language Not set Analogue input 4-20mA

Speed Maximum User trim None

Direction Clockwise Remote stop Open=run

Pumphead 520R Pump number 1

Tube size 9.6mm Baud rate 9600

Calibration

from head and tube
table

Stop bits 2

Backlight On Xon/Xoff Off

Keypad lock Off Scrolling increment 0.1rpm

Auto-restart Off Output 1 Run/Stop *

Scaling Off Output 2 Direction †

Pump status Stopped Output 3 Auto/Man ‡

Beeper On Output 4 General alarm

Manual screen rpm Run * = high

Security code Not set Clockwise rotation † = high

Auto ‡ = high

Note: The settings shown above for Run, Clockwise rotation and Auto are those in
force on initial start-up for the functions available on Output 1, Output 2 and Output
3 respectively. For example, a high signal on Output 2 indicates clockwise rotation.
These can be exchanged later according to user requirements.

Note: High is equivalent to the common and normally open contacts of the relay on
the adapter board being closed.

The pump is now ready to operate according to the defaults listed above.

All operating parameters may be changed by means of key-presses. See 14 Manual
operation.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 23

13 Switching the pump on
in subsequent power cycles
(if not in auto-restart mode)

 Switch on the power supply at the rear of the pump. The pump runs a power-

on test to confirm proper functioning of the memory and hardware. If a fault is
found, an error message is displayed. See 25.1 Error codes.

 The pump displays the Watson-Marlow start-up screen for four seconds fol-

lowed by the pump model identity screen for four seconds, and then the manu­al mode main screen.

 Note: If ANY key is pressed during the display of any of the preliminary

screens, the display jumps to the next screen. Quickly pressing any two keys or
any key twice immediately after switch-on causes the display to jump to the
manual mode main screen. Once in the manual mode main screen, keys
assume their normal functions - see 15.1 Keypad functions in manual mode
below. A subsequent press on START causes the pump to operate.

 Start-up defaults are those in place when the pump was switched off last.

Check that the pump is set to operate as you require it.

The pump is now ready to operate.

All operating parameters may be changed by means of key-presses. See 14 Manual
operation.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 24

14 Manual operation

14.1 Keypad functions in manual mode

All settings and functions of the pump
in manual mode are set and controlled
by means of key-presses. Immediately
after the start-up display sequence
detailed above, the manual mode main
screen will be displayed. The currently
selected rotation direction is indicated
on the display by a clockwise or count­er-clockwise segmented arrow. If an
exclamation mark ( ! ) shows, it indi­cates that Auto-restart is on (see 18.12
Auto-restart). If a padlock icon ( )
shows, it indicates that Keypad lock is
on (see 14.2 Keypad lock).

Note: A number of the controls listed
below are shortcuts to commands
which are also available through the
Main menu. See 15 Main menu.

A brief single press on each key trig­gers a beep sound (if enabled - see

14.3 Keypad beep) and causes the
pump to function as follows:

 START: starts the pump at the speed and in the direction shown on the dis-

play. The rotation symbol will become animated to confirm that the pump is
operating. We recommend that the speed is reduced to a minimum (0.1 rpm)
before starting the pump.

If the pump is running when START is pressed, it causes the information
shown on the manual mode main screen to cycle from revolutions per minute,
to flowrate in a choice of units (via a warning screen if flowrate has not been
calibrated and if this is the first cycle since power-up) to rpm, flowrate and Run
time. An example is shown here. (See START, above. See 17 Calibrate. See

18.9 Run time.) This cycle operates when the pump is stopped and when it is
running. The default can be altered from within the Setup menu. See 18.3
Display.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 25

 MAX: while pressed, MAX operates the pump at the maximum allowed speed

and in the direction shown on the display. When released, the pump returns to
its previous status.
Note: Priming can be achieved by pressing the MAX key until fluid flows
through the pump and reaches the point of discharge, and then releasing the
MAX key.

 AUTO/MAN: displays a screen offering three choices: manual control, ana-

logue control or network (RS485) control. Use the UP and DOWN keys to
make a choice. Press the ENTER key to confirm your decision. When started
under analogue or network control, the pump runs at the speed set by any
analogue or RS485 signal applied to the pump, and in the direction shown in
the display.

 STOP: has no effect if the pump is not running. If the pump is running, press-

ing STOP stops the pump. The display will continue to show the previous speed
and direction. The pump will return to this speed and direction when the
START key is pressed again.

 UP: increases the speed shown on the display in minimum steps of 0.1 rpm

(unless the speed displayed is already the maximum allowed speed). If the
pump is then started by pressing the START key, it will operate at the new
speed. If the pump is running when UP in pressed, the change takes effect
immediately.
Note: After a speed change, a screen showing the new rpm figure and the
new flowrate is displayed for four seconds before returning the user to the pre­viously set manual mode main screen: rpm or flowrate.

 DOWN: decreases the speed shown on the display in minimum steps of 0.1

rpm. If the pump is then started by pressing the START key, it operates at the
new speed. The minimum speed possible is 0.1 rpm. If the pump is running
when DOWN is pressed, the change takes effect immediately.
Note: After a speed change, a screen showing the new rpm figure and the
new flowrate is displayed for four seconds before returning the user to the pre­viously set manual mode main screen: rpm or flowrate.
Note: You can reduce the pump speed from 0.1 rpm to 0 rpm by a further
press on the DOWN key. The pump is still in the running state and the rotation
symbol will continue to move. Press the UP key to return the pump to the min­imum speed.

 DIRECTION: toggles the direction of rotation shown on the display. If the

pump is then started by pressing the START key, it rotates in the new direc­tion. If the pump is running when DIRECTION is pressed, the change takes
effect immediately.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 26

 ENTER: cycles the information shown on the manual mode main screen from

revolutions per minute, to flowrate in a choice of units (via a warning screen if
flowrate has not been calibrated) to rpm, flowrate and Run time. (See START,
above. See 17 Calibrate. See 18.9 Run time.) This cycle operates when the
pump is stopped and when it is running. The default can be altered from within
the Setup menu. See 18.3 Display.

 MENU: causes the main menu to be displayed, from which all aspects of pump

setup can be controlled. See 15 Main menu.

Keypress combinations cause the pump to function as follows:

 UP and DIRECTION on power-up: toggles the keypad beep on and off.
 START on power-up: switches on the Auto-restart facility. See 18.12 Auto-

restart.

 STOP on power-up: switches off the Auto-restart facility. See 18.12 Auto-

restart.

 STOP and DIRECTION on power-up: allows the user to press UP and DOWN

keys to toggle the sense of remote run / stop control between open=stop and
open=run.

 STOP and UP while the pump is stopped: turns the display backlight on.
 STOP and DOWN while the pump is stopped: turns the display backlight off.
 MAX and UP: sets the pump to maximum allowed speed.
 MAX and DOWN: sets the pump to minimum speed.
 DIRECTION and DOWN: interrupts the display to show the pump’s ROM ver-

sion for four seconds.

 START pressed and held for two seconds: toggles the keypad lock on and off.

Only the START and STOP keys are active when keypad lock is on. The pad­lock icon is displayed.

 STOP pressed and held for two seconds: toggles the keypad lock on and off.

Only the START and STOP keys are active when keypad lock is on. The pad­lock icon is displayed.

 STOP STOP within half a second: shortcut entry to MemoDose; when in

MemoDose, shortcut return to manual mode main screen. See 20 MemoDose.

Note: The maximum allowed speed of the drive defaults to 220 rpm. It is possible
to set this limit at any speed up to this value. See 18.13 Set maximum speed.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 27

14.2 Keypad lock

The keypad can be locked to prevent changes to pump speed or other settings, and
make it possible only to start or stop the pump. The padlock symbol shows on the
display.

 While the pump is running, hold down the START key for two seconds. The

padlock symbol shows and only the START and STOP keys function.

 The keypad may also be locked while the pump is stopped. Hold down the

STOP key for two seconds. The padlock symbol shows and only the START
and STOP keys function.

 To unlock the keypad while the pump is running hold down the START key for

two seconds. The padlock symbol is removed. If the pump is stopped hold
down the STOP key until the padlock symbol is removed.

14.3 Keypad beep

The pump keypad can operate silently or indicate a positive key-press with a beep
sound.

 To toggle the sound on and off, stop the pump. Turn off the mains power switch

at the rear of the pump.

 Depress the UP and DIRECTION keys while switching on the mains power

switch at the rear of the pump.

14.4 Manual operation and remote digital
inputs and outputs

The remote run / stop, direction and leak-detected inputs are operational.

The remote status outputs are all fully functional.

The STOP key acts as an overriding emergency stop. The run
/ stop input will not start the pump in manual mode, but once
the START key has been pressed, the remote run / stop
input will stop and start the pump according to its operational
state.

If you invert the operation of the remote run / stop switch to
operate as open=stop, you must connect the +5V terminal
to the i/p terminal on the Run/stop input connector (J4), to
be able to start the pump from the keypad.

If STOP is pressed the remote run / stop switch will have no
effect.

You cannot invert the polarity of the remote direction signal.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 28

15 Main menu

15.1 Keypad functions in menu screens

In addition to their functions in other
operations, the following keys have
specific actions in menu screens:

 STOP: In general, STOP functions

as a “go back” key, taking the user
up one menu level without making
a change.

 UP: The UP key is used in menu

item selection: it moves a highlight
up the menu. When a numerical
entry screen is displayed, pressing
UP increases the number dis­played.

 DOWN: The DOWN key is used in

menu item selection: it moves a
highlight down a menu. When a
numerical entry screen is dis­played, pressing DOWN decreases
the number displayed.

 ENTER: The ENTER key functions

in a similar way to the “enter” key
of a personal computer: it confirms
key-presses made immediately
before. In menu item selection, it
triggers the action or display
selected from a menu using the UP and DOWN keys.

Note: Confirmation screens are displayed for 4 seconds. While they are displayed,
a single press on any key removes them.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 29

15.2 Main menu entry

The MENU key displays the main menu. It operates at any point in the pump’s activ­ity except where error screens are displayed, or screens where UP and DOWN keys
are used to enter values.

The main menu offers five options: Calibrate, Setup, Pin out details, MemoDose
and Exit. Use the UP and DOWN keys to make a choice. Press the ENTER key to
confirm your decision.

Calibrate

Calibrate allows the user to calibrate the pump with default figures for a range of

pumpheads and tubes, as well as to refine the flowrate figures with a calibration
dose facility.

Setup

Setup allows the user to set the pump’s operating parameters under 20 headings:
Trim, Analogue, Display, Pump number, Baud, Stop bits, Xon/Xoff, Flow
units, Run time, Outputs, Remote stop, Auto-restart, Set max speed,
Backlight, ROM, Language, Defaults, Beep, Security and Exit.

Pin out details

Pin out information is not relevant to the 520DuN IP66/NEMA 4X pump. Selecting
Pin out details causes the pump to display a warning screen and redisplay the main
menu.

MemoDose

The MemoDose facility is used to remember the number of revolutions needed to dis­pense a set volume of fluid, and cause the pump to dispense that volume repeatedly.

Exit

If Exit is selected, the pump returns to its last manual state with the pump stopped.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 30

16 PIN-secure process protection

The 520DuN and 520Du feature PIN-secure process protection. This allows the
pump to be configured to suit the application, and for the setup to be protected
by two levels of PIN code. See 18.19 Security code setup.

* When the keypad is locked, MemoDose is available via its access shortcut:
press STOP twice; it is not available through the menu structure.

The main code allows changes to Calibrate, Setup, Direction and Keypad
lock.

The secondary (User) code permits Calibrate, Direction change and Keypad
lock but bars Setup change.

If either code is used in conjunction with Keypad lock, all keys are disabled
except STOP and START.

To activate and set a security code, see 18.19 Security code setup.

If the main code is lost or forgotten: The Setup main security code can be
bypassed by entering a special key sequence; all codes can then be cancelled
and reset. Contact Watson-Marlow or your distributor for details.

Menu option
or keypress

With Main

code set

With User

code set

Code set and

keypad locked

Menu Available Available Not available

Calibrate Available Available Not available

Accept Available Available Not available

Change

Main PIN

needed

Main PIN or User

PIN needed

Not available

Setup

Main PIN

needed

Main PIN needed;

User PIN invalid

Not available

MemoDose Available Available Available*

Pin out details Available Available Not available

Max Available Available Not available

Dir

Main PIN

needed

Main PIN or User

PIN needed

Not available

Auto / Man Available Available Not available

Up Available Available Not available

Down Available Available Not available

Max and Up Available Available Not available

Max and Down Available Available Not available

Start Available Available Available

Stop Available Available Available

Enter Available Available Not available

Keypad lock

Main PIN

needed

Main PIN or

User PIN needed

Main PIN or

User PIN needed

Auto-restart Available Available Available

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 31

17 Calibrate

The pump can display flowrate in a choice of units as well as speed in revolutions
per minute. It must first be calibrated.

Pump calibration can be limited to users who correctly enter a three-digit security
code. If a security code has been set, selecting Change from the calibration details
screen and confirming with the ENTER key causes the pump to display the Security
code entry sequence. See 16 PIN-secure process protection. If no security code has
been set, the pump displays the first screen of the calibration sequence.

To dispense the correct amount of fluid the pump must know which pumphead is fit­ted and the tube size in the pumphead. The pump is pre-programmed with default
flow rate figures for a range of pumpheads and tubes. You may also measure the
flow from the pump and enter this value for the most accurate calibration.

 Use the UP and DOWN keys to highlight Calibrate in the main menu. Press

ENTER to confirm.

 The pump displays its current settings: pumphead, tube size and flowrate; the

default for each standard pumphead is the largest tube the pumphead can
take. Example information is shown here.

 Use the UP and DOWN keys to highlight Accept or Change. Press ENTER to

confirm.

 If Accept is selected, the default or previously set flowrate data for that pump-

head and tube size are used in flowrate calculations. The pump redisplays the
main menu.

 If Change is selected with a security code in place, the pump starts its security

code entry sequence. See 16 Security code entry. When the correct code is
entered, the pump offers three options: Head and tube; Tube; and
Calibration dose. If Change is selected with no security code in place, the
three options are displayed immediately.

 Use the UP and DOWN keys to make a selection. Press ENTER to confirm.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 32

Head and tube



If Head and tube is selected, the pump displays a list of standard pumpheads
that can be fitted to the pump. It occupies two screens. Use the UP and
DOWN keys to move the highlight down the list. When the last item on the
first screen is highlighted, a further press on the DOWN key causes the pump
to display the second screen with its first item highlighted.

 Use the UP and DOWN keys to make a selection. Press ENTER to confirm. An

example is shown here.

 The pump displays tube sizes, as below.

Tube

 If Tube is selected or a pumphead choice has just been made, the pump dis-

plays a list of standard tube sizes that can be used in the pumphead previously
identified.

 Use the UP and DOWN keys to make a selection. Press ENTER to confirm.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 33

Calibration dose



The pump offers to run a calibration dose. Use the UP and DOWN keys to
choose Yes or No. Press ENTER to confirm. Examples are shown here.

 If No is selected after a tube selection has been made (see Tube above), the

pump briefly displays a confirmation screen showing current head, tube and
flow settings, and redisplays the main menu.

 If Calibration dose is selected or if Yes is selected after a tube selection has

been made (see Tube above), the pump displays the speed and direction at
which it was last running in manual mode or to which it has just been set and
invites the user to press START.

 Note: it is possible at this point to change the direction of rotation using the

DIRECTION key, and the change the speed of rotation using the UP and
DOWN keys, up to the pump’s maximum speed or any (lower) maximum avail-

able speed which has previously been set. See 18.13 Set maximum speed.

 Put a measuring container at the pump outlet. Press START. The pump runs

for 4 minutes, displaying an information screen for 15 seconds and a further
information screen for the rest of the 4 minutes. You may stop the calibration
dose at any time with the STOP key - but allow the pump to run as long as
possible to obtain the most accurate calibration. A minimum of 15 seconds is
recommended.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 34

 Measure the quantity of fluid dispensed. The pump displays its calculated dose,

based on previous calibration data. Use the UP and DOWN keys to adjust this
reading to match the measured volume. Press ENTER. The pump displays the
new head, tube and flow settings, and redisplays the main menu. Example fig­ures are shown here.

Note: If the pump has been set to display flow rate in units of mass (see 18.8 Flow
units), as in this example, the pump displays a screen allowing you to confirm the

specific gravity of the duty fluid immediately before the final press on ENTER.

Note: Always recalibrate after changing pump tubes, fluid, or any connecting

pipework. It is also recommended that the pump is recalibrated periodically to main­tain accuracy.

Note: If the pump power is cycled while flow rate is displayed, calibration is lost and
a warning is displayed.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 35

18 Setup

Entry to the Setup menu can be limited to users who correctly enter a three-digit
security code. If a security code has been set, selecting Setup and confirming with
the ENTER key causes the pump to display the Security code entry sequence. See
16 Security code entry. If no security code has been set, the pump displays the first
of six screens containing the Setup menu.

The Setup menu

Make a selection using the UP or DOWN keys and press ENTER to confirm your
choice.

The Setup menu
occupies six
screens. The first
two are shown
here.

To move from
one screen to
subsequent
screens, repeat­edly press DOWN. Each item is highlighted in turn until the last item
on the screen is highlighted.

A further press on the DOWN key displays the next screen of the
menu, with the first item highlighted.

Follow the reverse procedure using the UP key to move to an item on
a previous screen of the menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 36

18.1 Trim

When the pump is under remote control, it tracks an analogue signal from the user’s
remote control system to the i/p terminal of the Analogue 1 and Analogue 2 con­nectors at the rear of the pump within the ranges 4-20mA or 0-10V. The Trim setup
sequence allows the user to customise the process-signal-to-pump-speed calibra­tion. The sequence may be entered directly from the Setup menu or from the
Analogue setup menu.

 Select Trim from the Setup menu or the Analogue setup menu using the UP or

DOWN keys and press ENTER to confirm your choice.

 Apply the low process analogue signal to the i/p terminal of the Analogue 1

connector as instructed in the display. See 18.2 Analogue. While the signal is
being applied, press ENTER to record the signal as a calibration point.

 Apply the maximum process control signal. While the signal is being applied,

press ENTER to record the signal as a calibration point.

 Apply 50% of the maximum process control signal. While the signal is being

applied, press ENTER to record the signal as a calibration point.

 If a mistake is made, press STOP at any point in the sequence, and the pump

displays the previous screen.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 37

 The final press on ENTER ends the Analogue 1 trimming sequence.

 If Analogue 2 has been configured, the pump displays a similar sequence of

screens for that input. Apply the low, high and mid-range signal to the i/p
terminal of the Analogue 2 connector as instructed in the display, pressing
ENTER each time to record the signals as calibration points.

 If a mistake is made, press STOP at any point in the sequence, and the

pump displays the previous screen.

 The final press on ENTER ends the Analogue 2 trimming sequence.

 When trimming is complete the pump displays a confirmation screen and redis-

plays the screen from which it entered the trim sequence: the Setup menu or
the Analogue setup menu.

The pump calculates linear responses from low to mid and from mid to high, and
records the results as new analogue input calibration graphs.

If any of the three signals applied to each input match, a warning screen is displayed
before the confirmation screen appears, and the trim is ignored.

Note: By applying the maximum process control signal when the minimum is
requested and vice versa, inverted responses can be set up.

Note: Resetting factory defaults clears the trim calibration values.

18.2 Analogue

When the pump is under remote control, it tracks an analogue signal from the user’s
remote control system to the i/p terminal of the Analogue 1 connector at the rear of
the pump within the ranges 4-20mA or 0-10V. The Analogue option in the Setup menu
allows the user to configure the pump to operate with his remote control system.

 Select Analogue from the Setup menu using the UP or DOWN keys and press

ENTER to confirm your choice.

 Four options are displayed: Input 1 - speed, Scaling - stroke, Trim and Exit.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 38

Input 1 - speed allows the user to tell the pump which signal type he will apply to

Analogue 1, or to choose the program option. If he selects Program from the sub­sequent menu, the user can choose his input type and tell the pump the speeds at
which to operate on receiving a low or high process control signal. See Input -
speed.

Scaling - stroke allows the user to disable scaling control, or if he wishes to enable
scaling, to tell the pump which signal type he will apply to Analogue 2, or to choose
the program option. If he selects Program from the subsequent menu, the user can
choose his input type and tell the pump the speed proportion at which to operate on
receiving a low or high process control signal. See Input - speed.

Trim displays the Trim menu, described above. See 18.1 Trim.

Exit returns the user to the first section of the Setup menu. See 18 Setup.

Input 1 - speed
 Select Input 1 - speed using the UP or DOWN keys and press ENTER to con-

firm your choice.

 The pump offers two further choices: 4-20mA and 0-10V. Use the UP or

DOWN keys to make a selection and press ENTER to confirm your decision.

 The pump configures the hardware and factory-set response data and briefly

displays a confirmation screen. The user is returned to the Analogue setup dis­play. Example figures are shown here.

 Alternatively the user can select Program to configure the pump to respond in

a user-programmed way to any process signal range within the limits described
above.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 39

Program



Select Program using the UP or DOWN keys and press ENTER to confirm.

 The pump offers two choices: mA and V. Use the UP or DOWN keys to

make a selection and press ENTER to confirm your decision.

 The pump displays a screen allowing you to set the speed for low signal

input. Use the UP and DOWN keys to scroll the display to your chosen
speed and press ENTER to confirm the figure.

 The pump displays a screen allowing you to set the speed for high signal

input. Use the UP and DOWN keys to scroll the display to your chosen
speed and press ENTER to confirm the figure.

 If a mistake is made, the user may press STOP at any point in the

sequence (before pressing ENTER on the high signal speed screen), and the
pump will display the previous screen.

 The final press on ENTER causes the pump to configure the hardware and

programmed response data. It briefly displays a confirmation screen and a
warning that the analogue signal is not trimmed, and returns the user to the
Analogue setup menu. Example values are shown here.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 40

Scaling - stroke

 Select Scaling - stroke using the UP or DOWN keys and press ENTER to

confirm your choice.

 The pump offers five further choices: Off, Keypad, 4-20mA, 0-10V and

Program. Use the UP or DOWN keys to make a selection and press ENTER to

confirm your decision.

 If Off is selected, scaling control is disabled and the pump displays the

Analogue setup menu.

 The other options allow a choice of inputs to control scaling.

 If Keypad is selected, scaling will be controlled by keypad entry of the scal-

ing factor while the pump is running in Auto analogue mode.

 If 4-20mA or 0-10V is selected, the pump configures the the hardware and

calibration data appropriately. A confirmation screen is displayed briefly and
the user is returned to the Analogue setup screen.

 If Program is selected, the pump offers two choices: mA and V. Use the

UP or DOWN keys to make a selection and press ENTER to confirm your

decision.

 The pump displays a screen inviting the user to enter the required speed

proportion for low signal input as a value from 0.0 to 1.0. Enter your value
using the UP or DOWN keys and confirm by pressing ENTER.

 A similar screen allows the user to enter the required speed proportion for

high signal input as a value from 0.0 to 1.0. Enter the value in the same way.

 If STOP is pressed at any point in the program setup (before pressing

ENTER on the high signal speed proportion screen), the pump will display

the previous screen.

 When high and low values have been entered and confirmed, the pump

configures the hardware and basic calibration data. A confirmation screen is
displayed briefly, followed by a warning that the analogue signal has not
been trimmed. The user is returned to the Analogue setup screen.

See 22.4 Scaling: analogue input 2 in Automatic control wiring.

Trim

Trim displays the Trim menu, described above. See 18.1 Trim.

It is recommended that a trim calibration is always performed to align the pump’s
response to the actual process analogue signal.

Exit

Exit returns the user to the first section of the Setup menu, described above. See

18 Setup.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 41

18.3 Display

The pump can display three default screens in manual mode: revolutions per
minute, flowrate in a choice of units, or both.

 In the first screen of the Setup menu select Display using the UP and DOWN

keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing you to choose the format of the manual

mode main screen. Use the UP and DOWN keys to choose and press ENTER
to confirm your decision.

 If you choose Flowrate and you have not calibrated the pump since switching

it on, a warning screen is displayed for 4 seconds. The warning does not appear
if the display screen formats are cycled again, unless the pump has been
switched off in the mean time.

 The pump redisplays the first screen of the Setup menu.
 When the pump next runs, the manual mode main screen will display pump

activity in rpm, flowrate (in the units you chose - see 18.8 Flow units) or both,
according to your choice, plus a run time figure. Examples are shown here.

Alternatively ...
 In the manual mode main screen, repeatedly press ENTER to cycle the display

between rpm, flowrate (in the units you chose - see 18.8 Flow units) or com­bined, according to your choice. This cycle operates if the pump is running and
if it is stopped. While the pump is running, you can cycle the display in the
same way by repeatedly pressing START. In both cases, if you have not cali­brated the pump since switching it on, a warning screen is displayed for 4 sec­onds before the flowrate screen appears. The warning does not appear if the
display screen formats are cycled again, unless the pump has been switched off
in the mean time.

 The pump redisplays the first screen of the Setup menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 42

18.4 Pump number

The 520DuN pump can be individually controlled under RS485 as one of up to 32
pumps. First it must be given its identity number.

 In the first screen of the Setup menu select Pump no 1 using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing you to change the pump’s identity num-

ber. Use the UP and DOWN keys to change the number in the display to an
integer from 1 to 32 and press ENTER to confirm your decision. An example is
shown here.

 The pump displays the first screen of the Setup menu including the new identi-

ty number.

18.5 Baud

The 520DuN pump can be set to communicate with control devices at a choice of
baud rates.

 In the first screen of the Setup menu select Baud using the UP and DOWN

keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing you to change the pump’s baud rate. Use

the UP and DOWN keys to select 1200, 2400, 4800, 9600 or 19k2 and press
ENTER to confirm your decision.

 The pump displays the first screen of the Setup menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 43

18.6 Stop bits

The 520DuN pump can be set to communicate with control devices at a choice of
stop bits settings.

 In the second screen of the Setup menu select Stop bits using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing you to change the pump’s stop bits set-

ting. Use the UP and DOWN keys to select 2, 1, or 0 and press ENTER to con­firm your decision.

 The pump displays the second screen of the Setup menu.

18.7 Xon/Xoff

The 520DuN pump can be set to communicate with control devices using Xon/Xoff
flow control.

 In the second screen of the Setup menu select Xon/Xoff using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing you to set flow control on or off. Use the

UP and DOWN keys to choose and press ENTER to confirm your decision.

 The pump displays the second screen of the Setup menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 44

18.8 Flow units

The 520DuN pump can display its flow rate in metric (SI) or US (imperial) units of
volume or mass.

 In the second screen of the Setup menu select Flow units using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen offering Metric or US. Use the UP and DOWN keys

to choose and press ENTER to confirm your decision.

 If you chose Metric, the pump offers a choice of units: µl/min, ml/min, l/hr,

g/min or kg/hr. Use the UP and DOWN keys to choose and press ENTER to
confirm your decision.

 If you chose US, the pump offers a choice of units: US Gallons/hr, US

Gallons/day, lb/hr or lb/day. Use the UP and DOWN keys to choose and press
ENTER to confirm your decision.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 45

 If you chose a volumetric flow rate from either screen, a confirmation screen

appears briefly and the pump displays the second screen of the Setup menu.

 If you chose a mass flow rate from either screen, the pump asks for the specif-

ic gravity of the fluid to be pumped. Use the UP and DOWN keys to enter a
value between 0.01 and 15.00. Press ENTER to confirm your decision. Press
STOP if you decide to make a different choice of units.

 A confirmation screen appears briefly and the pump displays the second screen

of the Setup menu.

18.9 Run time

The 520DuN pump cumulatively records how many complete hours its motor runs.
The figure can be displayed or reset to zero.

 In the third screen of the Setup menu select Run time using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump briefly displays the total hours its motor has operated since the last

time the counter was reset to zero hours, followed by an opportunity to reset
the counter to zero hours. An example is shown here. Use the UP and DOWN
keys to choose Yes or No and press ENTER to confirm your decision.

 The total hours screen is briefly displayed with its total reset to zero hours, or

unchanged, as appropriate. The pump displays the third screen of the Setup
menu.

Note: Run time is displayed on the Combined display. See 18.3 Display. Run time
does not zero when factory default is selected.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 46

18.10 Outputs

The 520DuN pump offers four relay status outputs. See 12 Switching the pump on
for the first time for initial startup defaults. Each of five parameters can be config-

ured to any output, or more than one output.

The parameters are:

Run / stop

Provides a status output to indicate whether the pumphead is in a running or
stopped condition. When running at 0rpm, the run / stop output indicates run­ning.

Direction

Provides a status output to indicate which direction the pump is set to run in.

Auto / man

Provides a status output to indicate whether the pump is in analogue control
mode or manual control mode.

General alarm

Provides an alarm output when any system error condition occurs except: leak
detected; analogue signal out of range; analogue over-signal; analogue no sig­nal.

Leak detected

When used with a leak detector, this output provides an alarm when the pump
has been automatically switched off following tube failure.

Outputs 1-4 are available as single-pole change-over relay contacts: Relay 1, 2, 3
and 4. Connect to the normally open or normally closed contacts of the relay as
required and configure the pump’s software accordingly. See below in this section.

Note: The maximum rating on the relay contacts of this pump is 30VDC; maximum
load 30W.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 47

 In the third screen of the Setup menu select Outputs using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing you to configure each of the four outputs,

or to exit this menu. Use the UP and DOWN keys to choose and press ENTER
to confirm your decision.

 If Output 1 is chosen, the pump displays the five options.

 Selecting General or Leak using the UP and DOWN keys and confirming

the choice by pressing ENTER configures that option to Output 1, displays a
confirmation screen, and returns the user to the Output selection screen.

 Selecting Run/Stop, Direction or Auto/Man using the UP and DOWN

keys and confirming the choice by pressing ENTER displays screens allow-
ing the user to configure Run to High or Low, Clockwise to High or Low,
and Auto to High or Low respectively. Choose using the UP and DOWN
keys and press ENTER to confirm. The option chosen is configured to
Output 1. The pump displays a confirmation screen, and returns the user to
the Output selection screen.

 The user can configure Output 2, Output 3 and Output 4 in the same way, or

choose Exit.

 If STOP is pressed during configuration, the previous setting for the output is

retained and the pump redisplays the Output selection screen.

 If Exit is chosen, the pump returns the user to the third screen of the Setup

menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 48

18.11 Remote stop

The 520DuN pump can be started and stopped with a remote switch between the 5V
terminal and the i/p terminal of the Run/stop input, using an open=run or
open=stop command sense. It also operates with a logic input between 5V and 24V
on the i/p terminal of the Run/stop input. Disabling the remote stop control does not
disable other remote controls.

 In the third screen of the Setup menu select Remote stop using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing the user to disable the remote stop fea-

ture. Use the UP and DOWN keys to choose Yes or No and press ENTER to
confirm the decision.

 If No is chosen, the pump asks the user to make a further choice, according to

whether the pump is required to run on an open or closed remote switch:

Open=stop or Open=run. Choose using the UP and DOWN keys and press
ENTER to confirm. The pump briefly displays a confirmation screen (an exam-

ple is shown here) and returns the user to the third screen of the Setup menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 49

 If Yes is chosen, the pump asks the user whether the remote stop feature is to

be disabled fully (for both manual and auto operation), or only for manual
operation, leaving remote stop functioning when the pump is operating in auto
mode. Choose using the UP and DOWN keys and press ENTER to confirm. If
manual and auto was chosen, the pump briefly displays a confirmation screen
(an example is shown here) and returns the user to the third screen of the
Setup menu. If manual only was chosen, the pump asks the user to make a
further choice, according to whether the pump (with remote control available in
auto mode only) is required to run on an open or closed remote switch:

Open=stop or Open=run. Choose using the UP and DOWN keys and press
ENTER to confirm. The pump briefly displays a confirmation screen (an exam-

ple is shown here) and returns the user to the third screen of the Setup menu.

 Note: The confirmation screen indicates whether Remote stop is enabled or

disabled, and displays the command sense of the remote control switch even if

Remote stop has been disabled.

Alternatively ...

 To toggle the sense of the remote run / stop control between open=stop and

open=run: stop the pump. Turn off the mains power switch at the rear of the
pump.

 Hold down the STOP key and the DIRECTION key, and turn on the mains

power switch.

Even with the remote stop function disabled, the pump
could still start if the remote auto/manual toggle input
is used to toggle the pump into analogue mode.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 50

18.12 Auto-restart

This pump offers an auto-restart feature. If active on power loss, it restores the
pump when power returns to the operating state it was in when power was lost. It
does not operate when powering down in the middle of a dose: when the pump is
restarted, it will await a press on the START key to begin the interrupted dose
again. Auto-restart is retained while the pump is switched off. When the pump starts
running, look for the ! symbol on the display. This ! symbol indicates that the pump
is set for auto-restart.

 In the fourth screen of the Setup menu select Auto-restart using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing the user to activate auto-restart. Use the

UP and DOWN keys to choose On or Off and press ENTER to confirm the
decision.

 If Off is chosen, the pump returns the user to the fourth screen of the Setup

menu. The auto-restart facility will not operate.

 If On is chosen, the pump returns the user to the fourth screen of the Setup

menu, where an exclamation mark ( ! ) is now visible. This mark confirms that
the auto-restart feature is in place and will operate the next time power is lost
and restored.

Alternatively ...

 Stop the pump. Turn off the mains power switch at the rear of the pump.
 Hold down the START key and turn on the mains power switch. The ! symbol

shows on the display.

 Start the pump. If the mains supply is interrupted the pump will automatically

restart when the mains power returns.

 To remove auto-restart switch off the mains power at the rear of the pump.

Hold down the STOP key and turn the mains power switch on. The ! symbol
does not appear.

Do not use auto-restart for more than 100 starts per
hour. We recommend remote control where a high
number of starts is required.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 51

18.13 Set maximum speed

The 520DuN pump offers a maximum speed of 220 revolutions per minute. This limit
can be reduced for operational purposes.

 In the fourth screen of the Setup menu select Set max speed using the UP

and DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing the user to set the maximum speed of the

pump equal to or lower then the maximum available. Use the UP and DOWN
keys to set the maximum allowed speed and press ENTER to confirm the fig­ure.

 The pump returns the user to the fourth screen of the Setup menu.
 Altering the maximum speed automatically re-scales the analogue speed con-

trol response.

Note: The maximum speed available depends on the pumphead selected during
calibration.

18.14 Backlight

The pump’s display can be illuminated or not according to choice.

 In the fourth screen of the Setup menu select Backlight using the UP and

DOWN keys. Press ENTER to confirm your choice.

 The pump displays a screen allowing the user to switch the display backlight on

or off. Use the UP and DOWN keys to choose On or Off and press ENTER to
confirm the decision.

 The pump returns the user to the fourth screen of the Setup menu. The display

is now illuminated or not according to the user’s decision.

Alternatively ...

 To turn the backlight off: press STOP and DOWN together.
 To turn the backlight on: press STOP and UP together.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 52

18.15 ROM

The pump can display its software version, model number and pump speed.

 In the fourth screen of the Setup menu select ROM using the UP and DOWN

keys. Press ENTER to confirm your choice.

 The pump displays the software version, model number and pump speed for

four seconds, then returns the user to the fourth screen of the Setup menu. It
also displays a checksum: CHK 123, for example. This may be required if
reporting pump performance to the Watson-Marlow service department.

Alternatively ...
 Press REVERSE and DOWN together to interrupt the display and show the

pump’s ROM version for four seconds.

18.16 Language

The pump can be set to operate in several languages.

 In the fifth screen of the Setup menu select Language using the UP and

DOWN keys. Press ENTER to confirm your choice.

 In the next screen, choose a language using the UP and DOWN keys. Press

ENTER to confirm your choice. The pump redisplays the fifth Setup screen in

your chosen language. All screens will subsequently appear in your chosen lan­guage.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 53

18.17 Defaults

All the pump’s user-set data can be reset to factory defaults.

 In the fifth screen of the Setup menu select Defaults using the UP and DOWN

keys. Press ENTER to confirm your choice.

 A warning is displayed for four seconds, and the pump asks the user to confirm

that factory defaults are to be reset. Use the UP and DOWN keys to choose
Yes if you wish the pump to reset all user-set data back to factory defaults

(see 12 Switching the pump on for the first time); or No if you do not wish to
do this. Press ENTER to confirm your decision. If Yes was chosen, the pump
will reset its factory defaults and redisplay the fifth Setup screen. If No was
chosen, the pump will make no changes to its setup and redisplay the fifth
Setup screen.

18.18 Beep

The pump keypad can operate silently or indicate a positive key-press with a beep
sound.

 In the fifth screen of the Setup menu select Beep using the UP and DOWN

keys. Press ENTER to confirm your choice.

 In the next screen, use the UP and DOWN keys to choose On or Off. Press

ENTER to confirm your decision. The pump redisplays the fifth Setup screen.

Alternatively ...

To toggle the sound on and off, stop the pump. Turn off the mains power switch at
the rear of the pump.

Depress the UP and DIRECTION keys while switching on the mains power switch
at the rear of the pump.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 54

18.19 Security code

Access to the pumpís Setup menu, direction control and keypad lock can be restrict­ed to those who correctly enter a three-digit security code: the main code. A sec­ondary user code can be set, which permits PIN access to direction and keypad lock,
but blocks access to Setup. See 18 Setup, 14.1 Keypad functions in manual mode
and 14.2 Keypad lock.

The code must first be set.

 In the fifth screen of the Setup menu select Security code using the UP and

DOWN keys. Press ENTER to confirm.

 If no code has been set, a screen is displayed inviting the user to set a main

code. Press ENTER to proceed (or STOP to return to the fifth screen of the
Setup menu).

 If a main code has been set, a screen is displayed inviting the user to set a

new main code, to set a user code (or a new user code if one has already been
set), or to cancel all codes. Choose Set main code, Set user code or Cancel
codes using the UP and DOWN keys. Press ENTER to confirm your choice.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 55

 If you chose Cancel codes, any codes previously set are cancelled and access

to the pump is not restricted.

 If you chose Set main code or Set user code, the pump displays a screen

with three blank spaces for digits and the instruction “Enter new code”. Use the
UP and DOWN keys to enter three digits. Press ENTER to confirm each one.
The pump displays a similar three-digit entry screen and the instruction
“Confirm code”.

 Repeat the digit-entry sequence.
 If the second three-digit code entered differs from the first, or if the digits cho-

sen as a user code are the same as those already set as a main code, the
pump briefly displays an error message and redisplays the set code options
screen.

 If the codes tally and, for a user code, if there is no clash with a previously set

main code, the pump briefly displays a confirmation message and redisplays
the sixth Setup screen. Access to the Setup and Configuration menus, Dose,
direction control and keypad lock is now protected by the new security code.

 If STOP is pressed during code entry, the pump returns the user to the fifth

Setup screen. If STOP is pressed during code confirmation, the pump returns
the user to the first digit-entry screen.

Note: A user code cannot be set unless a main code has previously been set. If you
wish to cancel only a user code, you must use Cancel codes to cancel both user
and main codes, then use Set main code to set a new main code.

Note: If a code has been set but forgotten, it is still possible to access the Setup
screens to cancel the code or reset it to another three-digit number. Contact your
supplier or Watson-Marlow Technical support for the bypass sequence.

18.20 Exit

 In the sixth screen of the Setup menu Exit is highlighted. Press ENTER.
 The user is returned to the main menu.

19 Pin out details

Pin out information is not relevant to the 520DuN IP66 / NEMA 4X pump. Selecting
Pin out details causes the pump to display a warning screen and redisplay the main
menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 56

20 MemoDose

Each time the pump is started by pressing START, it records the number of pump-
head revolutions which occur until STOP is pressed. The number of revolutions is
proportional to the volume of fluid which has been dispensed: the dose. The
MemoDose facility allows the user to repeat-dose a precise volume of fluid. To do so,
a quantity of fluid must be dispensed as the master dose which the MemoDose facil­ity can repeat exactly or proportionately.

To dispense a master dose

 In the manual mode main screen, set the appropriate pump speed and direc-

tion using the UP or DOWN keys and the DIRECTION key. An example is
shown here. A slower speed may make it easier for the user to measure accu­rately - though it may not represent the duty condition.

 Place a suitable measuring vessel under the pump delivery tube.
 Press START. The pump runs and fluid is pumped into the vessel.
 When the required volume of fluid has been dispensed, it is necessary to stop

the pump and display the MemoDose screen. This can be achieved in three
ways.

1. Press the STOP key twice within half a second. The pump stops and imme­diately displays the MemoDose screen.
OR...

2. Press the STOP key once. The pump stops. (This may make it easier to
ensure that the quantity of fluid that has been dispensed is sufficiently pre­cise.) Then press the STOP key twice within half a second. The pump dis­plays the MemoDose screen.
OR ...

3. Press the STOP key. The pump stops. Press the MENU key. Use the UP or
DOWN keys to select MemoDose. Press ENTER to confirm. The pump dis­plays the MemoDose screen.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 57

To repeat the dose

 The pump has recorded the number of pumphead revolutions required to dis-

pense the master dose. If the volume of fluid in the measuring vessel is the
volume required, press START to repeat the dose.

 If the volume of fluid in the measuring vessel differs from the volume required,

the percentage may be adjusted within the limits 1% to 999% of the master
dose. Use the UP or DOWN keys to alter the percentage. Press START to dis­pense the new dose.

 The display counts down as the dose proceeds and stops when the dose is

complete.

 If STOP is pressed during dosing, the pump stops and returns the user to the

MemoDose percentage screen.

Press the STOP key twice within half a second if you wish to exit MemoDose and
return to manual operation.

20.1 Changing dosing speed

The user must exit MemoDose in order to change pump speed (and direction). After
returning to MemoDose, the pump dispenses the previous dose size at the new speed.

 Press the STOP key twice within half a second. The pump displays the manual

mode main screen.

 Do not start the pump. Doing so erases the previously recorded master

dose and replaces it in the pump’s memory with the current, unmea­sured dose. Adjust the speed showing on the display using the UP or DOWN

keys.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 58

 Press the STOP key twice within half a second to return to MemoDose. The dis-

play shows the previous percentage dose size. The pump will dose at the new
speed.

Note: To retain the MemoDose value through a power interruption the pump must
be in auto-restart mode. The dosing cycle will resume at the start of a dose and wait
for START to be pressed, with the MemoDose percentage screen displayed. See

18.12 Auto-restart.

20.2 Footswitch operation and other
remote inputs and outputs with
MemoDose

A footswitch or a momentary contact switch can be used
to trigger MemoDose dispensing as a hands-free alterna­tive to pressing START.

To install a footswitch, connect it between the +5V termi-
nal and the i/p terminal of the Dose input connector (J3).
Alternatively a logic signal of between 5V and 24V can be
applied to the i/p terminal of the Dose input connector
(J3), ground to the OV terminal.

To operate MemoDose with a footswitch, briefly press the
footswitch while the MemoDose percentage screen is dis­played.

The remote run / stop input is operational. If a dose is interrupted by a remote stop
signal, the dose will continue from where it stopped when the state is changed to
run.

Remote direction control is disabled. The leak-detection input is operational. All sta­tus outputs are operational.

Note: The keypad lock feature is particularly useful to prevent inadvertent dose
changes while using the MemoDose facility. Keypad lock continues to operate in
MemoDose if previously enabled; it can also be enabled while in MemoDose mode.
See 14.2 Keypad lock.

21 Exit

Press Exit in the Main menu to return to the Manual mode main screen.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 59

22 Automatic control wiring

Interfacing the pump with other devices is by means of screw-terminal connectors
within the 520N watertight module at the rear of the pump. Suitable cable must be
passed into the module through one or more watertight cable glands and connect­ed appropriately. The module must be removed to allow this.

It is important to check the pump’s voltage setting to
ensure that it matches the supply. The voltage selec­tion switch is on the rear panel of the drive. The
module must be removed (and replaced) to allow it
to be checked.

22.1 520N module removal and
replacement

To remove the 520N watertight module:

The module is secured to the back of the drive unit by six M5x12 Pozidriv counter­sunk stainless steel screws.

 Remove the six screws using a suitable crosspoint screwdriver, leaving the top

centre screw till last. Even when all screws have been removed, the sealing
strip may cause the module to adhere to the drive. If so, a gentle tap will free
it. Do not use a tool to lever it off.

 The sealing strip should be retained within its channel on the face of the mod-

ule. The transparent on/off switch cover should be retained on its flange on the
face of the module. Check the integrity of the seal and the transparent on/off
switch cover. If either is damaged, it must be renewed to maintain ingress pro­tection.

 If necessary, unplug the two 25-way D-connectors linking the module to the

pump drive. If necessary, remove the module’s earth link from the back of the
drive. However, the link is long enough to allow the module to fold back to give
access to the the circuit board inside and to the back of the drive.

To replace the 520N watertight module:

 Check that the fuse in the fuseholder (ringed) in the centre of the switchplate

does not need to be replaced. Check that the voltage selector switch is correct­ly set for your power supply.

 Check that the sealing strip is fully in its channel on the face of the module.
 Attach the module’s earth link wire. Replace and tighten its screw to 2Nm.
 Push home the female (upper) and male 25-way D-connectors on to their coun-

terparts on the rear of the drive.

 Hold the module in place, taking care not to disturb the seal or pinch the earth

link wire or D-connector ribbon cables, and screw in the six retaining screws
(top centre screw first). Tighten to 2.5Nm.

Note: Ensure that the 520N module is properly fitted at all times using all six
screws. Without the module and the screws, the screw holes may corrode and IP66
(NEMA4X) protection will be compromised.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 60

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 61

22.2 Wiring up

It is the user’s responsibility to ensure the pump’s safe and reliable operation under
remote and automatic control.

The 0V lines on this pump are commoned and mains transformer-isolated from ground
(floating ground). It can be connected to isolated 0V or grounded 0V interfaces.

Cable entry to the module is via up to four
watertight cable glands. These may be fitted
in place of the sealing plugs which are fitted
to the back of the module when the pump is
shipped.

The number of glands needed depends on the
number of connection cables required and the
convenience of the installer. As standard, four
M16 cable glands are provided with the pump.

Recommended control cable conductors for the terminal blocks: metric = 0.14sq
mm - 2.5sq mm solid and 0.14sq mm - 1.5sq mm stranded. USA = 26AWG - 14AWG
solid and 26AWG - 16AWG stranded. Cable: circular. Max/min outside diameter to
ensure a seal when passed through the standard gland: 9.5mm-5mm. The cable

section must be circular to ensure a seal.

For EMC protection, shielded control cable should be used. The shielding should be
terminated to one of the pcb mounting screws or to the adjacent spade connection
(where fitted).

For improved EMC protection in extremely noisy environments, shielded cable may
be used in conjunction with watertight EMC metal cable glands. These must be
earthed to the module by adding an M16x1.5 nut with serrated edges to ensure
proper contact with the inside of the module. It is necessary to remove the module’s
circuit board to access the interior of the module: it is held in place by two fixing
screws which can be removed and replaced with a cross-point screwdriver. Take nor­mal anti-static precautions when handling printed circuit boards.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 62

Suitable cables for general-purpose use: 300V with extra premium grade PVC jack­et with good flame and moisture resistance.

Suitable cables for industrial use: 300V extra-rugged polyurethane grade jacket with
resistance to oils, fuels, solvents and water.

For convenience of wiring more than 8 conductors per cable may be awkward to
handle. Only two appear in the illustrations here, for clarity.

 Use a 19mm spanner to unscrew the sealing plug. Discard the nylon sealing

washer.

 Screw in one of the supplied M16x1.5 cable glands in place of the plug, using

the new nylon sealing washer supplied. Tighten the gland to 2.5Nm to ensure a
seal, using a 21mm spanner. If a different gland is used, it must be watertight
to IP66.

 Loosen the gland cap (do not remove it) and pass the cable in through the

gland. When it has passed through the gland, continue to push the cable
through.

 The inside of the module is shaped to guide the cable past the printed circuit

board inside. Continued pushing will feed in enough cable to grip inside the
module with the fingers.

 Pull through sufficient cable to reach the connectors required. Leave a little slack.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 63

 Strip the outer sheath as necessary and remove 5mm of insulation from the

conductors. No tinning or ferrule is required. Note: If very stiff or large-diame­ter cable is used, it may be convenient to strip the outer sheath before passing
the cable’s conductors through the gland. However, to ensure a seal, cable with
an undamaged sheath must be present within the gland when it is tightened.

 Twist a suitable length of the cable screen. Loosen one of the pcb retaining

screws and wind the shielding round it. Secure the screen by refastening the
screw. Alternatively, secure the cable screen to the adjacent spade connection
(where fitted).

 Push the bared conductor into the square hole in the connector. When the con-

ductor is fully in, tighten the retaining screw to hold it in place.

 When all conductors are in position, use a 21mm spanner to tighten the gland

cap to 2.5Nm to ensure a seal. Alternatively, tighten the gland by hand until it
is finger-tight and use a spanner to tighten it further by one-half a turn.

Do not strap the control and mains power cables together.

520N watertight module pcb connectors:

Never apply mains power to the terminals within the
520N module. Apply the correct signals to the terminals
shown below. Limit signals to the maximum values

shown. Do not apply voltage across other terminals.
Permanent damage, not covered by warranty, may result. The
maximum rating on the relay contacts of this pump is 30V DC;
maximum load 30W.
Note: Also suitable for low power: ie, 1mA at 5VDC minimum.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 64

22.3 Speed: analogue input

It is possible to control the speed of the pump remotely by
one of these methods: a voltage analogue signal within the
range 0-10V; or a current analogue signal within the range
4-20mA; or a remote potentiometer using the 10V supply at
J7.

The analogue process signal must be applied to the i/p ter-
minal of the Analogue 1 connector (J5). Ground to the 0V
terminal of the same connector. The pump will provide an
increasing flow rate for a rising control signal (non-inverted
response) or an increasing flow rate for a falling control sig­nal (inverted response). See 16.2 Analogue in the Setup
menu.

4-20mA circuit impedance: 250Ω.

For voltage mode, 0-10V, a stable, reliable voltage source can be used with a DC
voltmeter. Circuit impedance: 22kΩ.

Inverting the response is set up in software. Do not invert the polarity of the termi­nals.

A remote potentiometer with a
nominal value of between 1k and
2k with a minimum of 0.25W
should be wired between the ter­minals of the Rem-pot connector
(J7) and the i/p terminal of the

Analogue 1 connector (J5). When
using a remote potentiometer, do not apply a voltage or cur­rent control input signal at the same time. The speed control
signal will require calibration relative to the minimum and
maximum settings of the potentiometer. This is done in soft­ware - see 18.1 Trim in the Setup section.

When using a remote potentiometer, it is important to set the analogue input to volt­age in the Setup menu. Otherwise the reference voltage supply from the Rem-pot
connector will be overloaded and will not provide a full 10V.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 65

22.4 Scaling: analogue input

It is possible to scale the speed of the pump remotely by one
of these methods: a voltage analogue signal within the range
0-10V; or a current analogue signal within the range
4-20mA; or a remote potentiometer using the 10V supply at
J7.

The analogue process signal must be applied to the i/p ter-
minal of the Analogue 2 connector (J8). Ground to the 0V
terminal of the same connector.

4-20mA circuit impedance: 250Ω.

For voltage mode, 0-10V, a stable, reliable voltage source can be used with a DC
voltmeter. Circuit impedance: 22kΩ.

Inverting the response is set up in software. Do not invert the polarity of the termi­nals.

A remote potentiometer with a

nominal value of between 1k and

2k with a minimum of 0.25W

should be wired between the ter-

minals of the Rem-pot connector

(J7) and the i/p terminal of the

Analogue 2 connector (J8). When
using a remote potentiometer, do not apply a voltage or cur­rent control input signal at the same time. The scaling con­trol signal will require calibration relative to the minimum
and maximum settings of the potentiometer. This is done in
software - see 18.1 Trim in the Setup section.

When using a remote potentiometer, it is important to set the analogue input to
voltage in the Setup menu. Otherwise the reference voltage supply from the Rem­pot connector will be overloaded and will not provide a full 10V.

The speed of the pump as set by Analogue 1 is scaled in proportion to the signal
from Analogue 2 according to the formula y=as, where a is the speed set by
Analogue 1, s is the scaling set by Analogue 2 (0V or 4mA = 0, increasing linearly
to 10V or 20mA = 1), and y is the scaled rotation speed. If Analogue 2 has been set
for an inverted response, the reverse is true. See 18.2 Analogue in the Setup menu.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 66

22.5 Speed: analogue output

An analogue voltage output signal is available on
the Tacho output connector (J11), between the V
terminal and the 0V terminal. The voltage is fixed
and directly proportional to the pumphead rotation
speed. 0V = zero speed; 10V = maximum allowed
speed.

A current analogue signal within the range 4-20mA
is available between the mA terminal and the 0V
terminal. The current is fixed and directly propor­tional to the pumphead rotation speed. 4mA = zero
speed; 20mA = maximum speed.

Note: If the mA output is to be used for reading
from a multimeter, a 250Ω resistor is required in
series.

22.6 Tachometer frequency output

A tachometer frequency output is available on the Tacho output connector (J11),
between the freq terminal and the 0V terminal. It provides a +5V square wave
pulse, maximum 0.5mA, the frequency of which is directly proportional to pumphead
rotation speed. It provides 5.717 Hz/rpm - 343 pulses per output shaft revolution.
The pulse train from the pump can be used to calculate the speed of rotation or to
determine the number of pumphead revolutions. This output has the required
strength to be effective up to 3m from the pump. Longer cable runs require signal
amplification.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 67

Important: general instructions for remote control inputs

All remote control inputs can be wired in two ways:

Logic

A logic voltage between 5V TTL and 24V industrial logic may be wired
to the input. The pump is configured to operate without modification
anywhere in this range. Any of the 0V terminals - though preferably
the 0V terminal associated with the desired input - is connected to the
control device’s 0V to make the circuit. Low is equivalent to 0V. High is
equivalent to 5V

24V.

Switch

A remote switch may be connected between the input and any positive
voltage supply from the pump - though preferably the associated sup­ply terminal. Do not use the 10V supply from the Rem-pot connector,
however.

22.7 Run / stop input

Remote run / stop: connect a remote switch between the i/p
terminal and the +5V terminal of the Run/stop i/p connector
(J4). Alternatively a logic input may be applied to the i/p ter-
minal, ground to the 0V terminal. High input stops the pump,
low input runs the pump. With no connection or with the
switch open, the pump will default to running. To change or
set the sense of the run / stop input, see 18.11 Remote stop
in the Setup menu.

22.8 Direction input

To enable remote direction control and
disable the DIRECTION key on the
keypad, link the terminals of the
Direction enable link connector (J6).

Important: Apply no voltage what­ever to the Direction enable link.

Connect a remote switch between the
+5V terminal and the i/p terminal of
the Direction i/p connector (J2). Open
switch for clockwise rotation, closed
switch for counter-clockwise rotation.
Alterna tively a logic signal may be
applied to the i/p terminal and the 0V terminal of the Direction i/p connector (J2).
Low input for clockwise rotation, high input for counter-clockwise rotation. With no
connection the pump defaults to clockwise rotation.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 68

22.9 Auto / manual toggle input

Connect a remote switch between the +5V terminal and
the i/p terminal of the Auto-man i/p connector (J1).
Closed switch for automatic control; open switch for man­ual control. Alternatively a logic input may be applied to
the i/p terminal of the Auto-man i/p connector, ground to
the 0V terminal. High input for automatic control; low
input for manual control.

22.10 MemoDose input

Connect a momentary contact switch such as a footswitch

or a handswitch between the 5V terminal and the i/p ter-

minal of the Dose i/p connector (J3). Close the switch to

begin a dose. This input is software-debounced and func-

tions in a similar way to the other remote inputs, such as

with 5V to 24V logic as shown above, using the i/p ter-

minal and the 0V terminal. Note: This input is software-

debounced, so the signal can be either momentary or

maintained during the dose. If maintained, the signal

must be removed before the next dose.

22.11 Leak detection input

Connect a remote leak-detection device between the +12V
terminal and the i/p terminal on the Tube monitor connec­tor (J9). Closed circuit indicates a leak. Alternatively a logic
input may be applied to the i/p terminal, ground to the 0V
terminal. High input indicates a leak. Connect the cable of a
Watson-Marlow Tube monitor leak detector as follows:

Note: Use only Watson-Marlow 520 series tube monitors.

Tube monitor
wire colour

520N module

Blue J9 0V terminal

Yellow J9 i/p terminal

Red J9 +12V terminal

Terminate the screen in the 520N module with a 360°
EMC gland if required. See 22.2 Wiring up.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 69

Important: pump status outputs

Outputs 1-4 are available as single-pole change-over relay contacts:
Relay 1, 2, 3 and 4. Connect to the normally open or normally closed
contacts of the relay as required and configure the pump’s software
accordingly. See 18.10 Outputs.

Note: The maximum rating on the relay contacts of this pump is 30V
DC; maximum load 30W.

Note: Also suitable for low power: ie, 1mA at 5VDC minimum.

22.12 Outputs 1, 2, 3, 4

Note: Relay 1 (J14) is represented here. Relay 2, Relay 3

and Relay 4 (J15, J16 and J17) function identically.

Connect your output device to the c (common) terminal
of your chosen relay connector and either the n/c termi-
nal or the n/o terminal (normally closed or normally
open) as required. Configure the pump’s software accord­ingly. See 18.10 Outputs.

By default, Relay 1 is configured to indicate Run/Stop sta­tus; Relay 2 is configured to indicate Direction status;
Relay 3 is configured to indicate Auto/man status; Relay
4 is configured to indicate General alarm status. See 12
Switching the pump on for the first time.

22.13 Supply voltages

An appropriate voltage supply is available where required
on each connector. In addition, supplies may be drawn
from the Spare supplies connector (J12).

In the table below, “Max load” is the maximum total load
on each supply, irrespective of the number of connections.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 70

DC Voltage Max load Typical use

+5V 10mA

Voltage supply for inputs using remote
switch.
Possible voltage supply for outputs if only 5V
is required.

+12V 10mA

Possible voltage supply for inputs using
remote switch.
Possible voltage supply for outputs. Voltage
supply for Watson-Marlow Tube Monitor leak
detector.
Part voltage supply (-12V also needed) for
the Watson-Marlow proximity switch.

-12V 10mA

Part voltage supply (+12V also needed) for
the Watson-Marlow proximity switch.

+10V
(from J7)

Reference voltage for remote potentiometer
speed control. Do not use as a general sup­ply voltage.

Note: All DC supplies are stabilised.

22.14 RS485 input

Connect your network link to J10 using
a screened twisted pair: A to A, B to B,
screen to 0V. Ensure that the pump is
configured to operate under Network
control. More than one pump may be
controlled with the same RS485 signal:
connect all pumps in parallel. See 24
Network control and operation.

The shorting link at J20 must be cor­rectly positioned to allow RS485 control
to function properly. Fit the shorting
link of a single pump or of the last
pump on a network line in the position marked INT on the three-pin header; fit the
shorting link of all other pumps on the network line in the position marked EXT on
the three-pin header.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 71

23 Automatic control and operation

Check that the pump is ready to run before selecting automatic operation. Remote
control signals may start the pump without warning.

How to get into auto operation

 While the maunal mode main screen is displayed, press the AUTO/MAN key,

or apply a high signal (5V to 24V) to the remote auto / manual input.

 If auto entry was triggered remotely, the pump responds to the analogue signal

as soon as this is done and shows the “AUTO” icon.

 If auto entry was triggered using the AUTO/MAN key, the pump offers three

choices: Analogue, Manual and Network. Use the UP and DOWN keys to
choose and press ENTER to confirm.

 Selecting Manual returns the user to the manual mode main screen. See 14

Manual operation.

 Selecting Network puts the pump into network (RS485) mode. See 24

Network control and operation.

 Selecting Analogue puts the pump into analogue mode. It responds to the

analogue signal as soon as this is done and shows the “AUTO” icon.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 72

 The pump is automatically switched into auto-restart mode and displays the !

icon. The only keys active are STOP, AUTO/MAN, DIRECTION and START
(available only as an extended keypress to toggle keypad lock). UP and DOWN
keys are available if manual scaling has been set (see below).

 If the remote direction input is active and the direction-enable link is applied,

the DIRECTION key is disabled. If keypad lock is set, only STOP and START
(available as an extended keypress to toggle keypad lock) are active.

 The pump displays whichever of four auto running screens is appropriate

according to the previously selected auto mode - 4-20mA or 0-10V with or
without scaling in place.

 The auto running screens display four pieces of information: the speed at which

the pump rotates after receiving a low signal on Analogue 1 (4mA or 0V); the
speed at which the pump rotates after receiving a high signal on Analogue 1
(20mA or 10V); the set speed (that is: the speed at which the pump is current­ly rotating according to the analogue speed signal and the analogue scaling sig­nal if scaling is set); and the flowrate in the units selected (see 18.8 Flow
units). The scaling percentage is also displayed if it is set.

 If manual scaling is enabled using the Setup menu (see 18 Setup), the scaling

percentage can be adjusted between 0% and 100% using the UP and DOWN
keys.

 The pump responds to remote digital inputs. If the run / stop input stops the

pump, the bottom line of the auto running screen shows “Remote stop”. When
it starts the pump again, this will disappear and the pump returns to normal
running mode.

 If the pump is stopped because a leak is detected, the screen displays “LEAK

DETECTED. Check and reset, then press Stop”. See 25.1 Error codes.

 The remote status outputs operate fully.

How to get out of auto operation

 Pressing the AUTO/MAN key displays three options: Analogue, Manual and

Network. Use the UP and DOWN keys to choose and press ENTER to con-

firm.

 Selecting Manual returns the pump to manual operation. Using this method

of changing from AUTO/MAN, the pump retains the set speed from its pre­vious operation in manual mode in a stopped condition. See 14 Manual
operation.

 Selecting Network puts the pump into network (RS485) mode. See 24

Network control and operation.

 Selecting Analogue returns the pump to analogue mode. It responds to the

analogue signal as soon as this is done and shows the “AUTO” icon.

 Alternatively, make the remote auto / manual input go low (0V). The pump

returns to manual operation and retains the set speed and run status from its
previous operation in analogue mode.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 73

Emergency stop



In an emergency press the STOP key. The pump stops and displays an inter­ruption screen.

 If keypad lock is in place when STOP is pressed, or if the pump is in auto

mode via the digital input, the interruption screen offers one key-press: press
START to continue auto operation.

 If keypad lock was not in place when STOP was pressed, the interruption

screen offers a choice: Continue to continue auto operation, or Manual to
switch to manual mode. Use the UP and DOWN keys to choose and press
ENTER to confirm.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 74

24 Network control and operation

Check that the pump is ready to run before selecting network operation. Remote
control signals may start the pump without warning.

How to get into network operation

 While the maunal mode main screen is displayed, press the AUTO/MAN key.
 The pump offers three choices: Analogue, Manual and Network. Use the UP

and DOWN keys to choose and press ENTER to confirm.

 Selecting Manual returns the user to the manual mode main screen. See

14 Manual operation.

 Selecting Network puts the pump into network (RS485) mode.
 Selecting Analogue puts the pump into analogue mode. See 23 Automatic

control and operation.

 The pump is automatically switched into auto-restart mode and displays the !

icon. The only keys active are STOP, AUTO/MAN and MENU.

 Remote stop, auto/man, dose, direction enable and direction inputs are inac-

tive. Leak input is active. See 25.1 Error codes.

 All pump status outputs are active.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 75

How to get out of network operation



Pressing the AUTO/MAN key displays three options: Analogue, Manual and
Network. Use the UP and DOWN keys to choose and press ENTER to con-

firm.

 Selecting Manual sets the pump to manual operation and retains the set

speed and run status from its previous operation in network mode. See 14
Manual operation.

 Selecting Network returns the pump to network (RS485) mode.
 Selecting Analogue sets the pump to analogue mode. See 23 Automatic

control and operation.

Emergency stop

 In an emergency press the STOP key. The pump stops and displays an inter-

ruption screen, from which select Continue to return to network control,
Manual to set the pump to manual control (see 14 Manual operation), or
Menu to display the main menu (see 15 Main menu). Use the UP and DOWN
keys to choose and press ENTER to confirm.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 76

24.1 RS485 command strings

Command Parameters Meaning

nCA - Clear LCD display

nCH - Home the cursor

nDO xxxxxxxxxx<,yyyyy>

Set and run one dose of xxxxxxxxxx
tacho pulses, with optional drip of yyyyy
(maximum 11,000) tacho pulses. See
note 1

nTC - Clear the cumulative tachometer count

nSP xxx.x Set speed to xxx.x rpm

nSI - Increment speed by 1rpm

nSD - Decrement speed by 1rpm

nGO - Start running

nST - Stop running

nRC - Change direction

nRR - Set direction to clockwise

nRL - Set direction to counter-clockwise

nRS - Return status. See note 2

nRT - Return the cumulative tachometer count

nW

[line 1]~[line 2]~
[line 3]~[line 4]@

Display text on 1 to 4 lines with ~ as
the line delimiter. Terminated by the @
character. See note 3

nZY - Return 0 for stopped or 1 for running

Note 1: The correlation between tachometer pulses and motor rotation is fixed
and provides a measurable and absolute way of monitoring the number of rev­olutions of the gearbox output shaft - 10,982 pulses per revolution. This in turn
allows the count to be equated to the amount of material dispensed - assuming
that the pumphead type and tube size are known.

Note 2: The status is returned to the sender in the following format: [pump
type] [ml/rev] [pumphead] [tube size] [speed] [CW/CCW] P/N [pump number]
[tacho count] [0/1 (stopped/running)] !

For example: 520Du 15.84 520R 9.6MM 220.0 CW P/N 1 123456789 1 !

Note 3: If the pump speed is changed subsequently, the pump must display the
screen shown here (example figures only) for 4 seconds before reverting to the
custom display. 1 to 4 lines of text can be written with ~
as the line delimiter and @ as the message end.

i.e., 1W520Du@ and 1W520Du~@ are both valid commands.

Note 4: In all cases 'n' can be any number from 1 to 32 inclusive, and by excep­tion the # symbol can be used as an all-drives command; but not with the RS,
RT or ZY commands, as the results would be indeterminate.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 77

25 Troubleshooting

If the pump display remains blank when the pump is on, make the following checks:

 Check the position of the voltage selector switch. The voltage selector is

mounted in the switchplate at the rear of the pump, protected from water by
the 520N module. The module must be removed to allow access to the switch­plate. See 22.1 520N module removal and replacement.

 Check the mains power switch at the rear of the pump.
 Check that mains power is available to the pump.
 Check the fuse in the fuseholder in the centre of the switchplate at the rear of

the pump.

 Check the fuse in the mains power plug if one is present.

If the pump runs but there is little or no flow, make the following checks:

 Check that the tube and rotor are in the pumphead.
 Check that fluid is supplied to the pump.
 Check that the tube is not split or burst.
 Check for any kinks or blockages in the lines.
 Check that any valves in the lines are open.
 Check that the correct wall-thickness tube is being used.
 Check direction of rotation.
 Check that the rotor is not slipping on the drive shaft.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 78

25.1 Error codes

If an internal error occurs, a flashing error screen is displayed. Note: Signal out of
range, Over signal, No signal and Leak detected error screens report the nature

of an external signal. They do not flash.

Error condition Suggested action

RAM write error

Attempt to reset by switching power OFF / ON. Or seek
support

RAM corruption

Attempt to reset by switching power OFF / ON. Or seek
support

OTP ROM error /
corruption

Attempt to reset by switching power OFF / ON. Or seek
support

OTP ROM read
error

Attempt to reset by switching power OFF / ON. Or seek
support

Unknown pump
type

Check the interface card and cables. Attempt to reset by
switching power OFF / ON. Or seek support

Display failure Seek support

Wrong key-press

Attempt key-press again. Attempt to reset by switching OFF
/ ON

Motor stalled

Stop pump immediately. Check pumphead and tube. Power
OFF/ON may reset. Or seek support

Tacho fault

Stop pump immediately. Power OFF/ON may reset. Or seek
support

Speed error

Stop pump immediately. Power OFF/ON may reset. Or seek
support

Over current

Stop pump immediately. Check system. Power OFF/ON may
reset. Or seek support

Over voltage

Stop pump immediately. Check mains voltage selector
switch. Check supply. Power OFF/ON may reset. Or seek
support

Under voltage

Stop pump immediately. Check mains voltage selector
switch. Check supply. ON/OFF may reset. Or seek support

Watchdog error

Attempt to reset by switching power OFF / ON. Or seek

support
Over temperature Stop pump immediately. Turn OFF. Seek support
Signal out of

range

Check analogue control signal range. Trim signal as

required. Or seek support
Over signal Reduce the analogue control signal
No signal Connect analogue control signal or return to manual control
Leak detected.

Check and reset

Remove the cause of any leak. The STOP key resets

Unrecognised
key-press

Attempt key-press again. Attempt to reset by switching

power OFF/ON. Or seek support

Work overload

Turn OFF. Check power supply. Check pumphead and

tubing. Wait 30 minutes. Power ON may reset. Or seek

support
Network not
detected

Turn OFF. Check network and connections. Or seek support

RS485 fault Turn OFF. Check network and connections. Or seek support

RS485 lost Turn OFF. Check network and connections. Or seek support

General error
condition

Turn OFF. Seek support

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 79

26 Drive maintenance

There are no user serviceable parts inside the pump (except the power cable:
see 10 Connecting this product to a power supply). The unit should be
returned to Watson-Marlow or its appointed agents or distributors for service.

27 Drive spares

Replaceable main fuse, type T2,5A H 250V
20mm: FS0064

Foot: MN2507M

Module seal: MN2507M

Module pcb: MNA2066A

Module switch cover:
MN2505M

Glands: GR0056 Blanking plugs: GR0057

Sealing washer for blanking plug and gland:
GR0058

Snap-fit vent: MN2513B

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 80

28 The 520R, 520R2 and 520RE
pumpheads

Identification of parts

1 Guard latch 5 Rotor cap 9 Pumping roller

2 Guard (520R, 520R2) 6 Tube guide roller

10 Tube clamp slider

(520R, 520R2)

3 Track 7 Rotor

11 Tube clamp

(520R, 520R2)

4 Clutch button cover 8 Follower roller

12 Guard with seal

(520RE)

13 Drain port (520RE)

520R/520R2 520REL/520REM/520REH

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 81

28.1 Pumphead position, removal and
replacement

The pumphead track can be fitted in one of three orientations to provide right, up
or down input/output port positions, whichever is convenient. Position the pump­head so that the tube ports face up or down only where the drive is placed on the
bench edge - otherwise the pump tube or the hinged guard will impact the bench.
Do not position the pumphead so that the tube ports face the keypad. Doing so may
result in a safety risk.

The pump can be configured for clockwise or counter-clockwise rotor rotation. Please
note, however, that tube life will be greater if the rotor rotates clockwise; and that
performance against pressure will be maximized if the rotor rotates counter-clock­wise.

To reposition the track

 Open the pumphead guard as described under 27.1 Opening the pumphead

guard, below.

 Remove the rotor as described under Rotor removal, below.

 Undo and withdraw the four track-retaining screws using a slotted screwdriver.
 Remove the track.
 Relocate the track in the desired position. Replace and tighten the track-retain-

ing screws.

 Replace the rotor as described under Rotor replacement below.
 Close the guard, pushing it fully home until the latch engages.

Always isolate the pump from the mains power sup­ply before opening the guard or performing any posi­tioning, removal or maintenance activity.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 82

Rotor removal



Remove any tubing from the pumphead.

 Open the flexible rotor cap in the centre of the rotor.
 Undo and withdraw the central locating screw using a slotted screwdriver.
 Pull the rotor hub off its dogged shaft.
 Between the hub and the shaft is a split collet. If the collet is retained by the

shaft, pull it off, loosening it if necessary by tapping it lightly. Avoid levering it
off using a screwdriver or other tool. If the collet is retained within the hub,
remove it, loosening it if necessary by reinserting the central locating screw a
turn or two and tapping the screw head lightly.

Rotor replacement

 Re-locate the split collet onto the drive shaft, rotating it until it fully engages

the dog. Fit the rotor body over the drive shaft.

 Open the flexible rotor cap in the centre of the rotor. Use a slotted screwdriver

to tighten the central locating screw to a torque of 3Nm (2.2 lb-ft) to prevent
collet slip during operation. When fitted correctly, the tube guide rollers should
align with the outer face of the track. Close the flexible rotor cap.

 Close the guard and ensure that the rotor is clear of the guard by observing

the first few rotor rotations.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 83

29 520R, 520R2 and 520RE
installation

29.1 Opening the pumphead guard

 Unlock the pumphead guard by turning the guard fastener

1

⁄4 turn anticlockwise

with a slotted screwdriver.

 Open the guard to its full extent to create maximum clearance for the tube

ports.

 Ensure that the rollers rotate freely and that the tube clamps are clean.

Always isolate the pump from the mains power supply
before opening the guard or performing any positioning,
removal or maintenance activity.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 84

29.2 520R and 520R2 tube loading

520R continuous tubing pumpheads are factory-set to accept Watson-Marlow

1.6mm-wall tubing. 520R2 continuous tubing pumpheads are factory set to accept
Watson-Marlow 2.4mm-wall tubing. Pumping performance may be adversely affect­ed if Watson-Marlow tubing is not used.

 Mark a 225mm (8

7

⁄8 in) length onto the section of the tubing which is to be

located into the pumphead. Caution: Placing more than 225mm (8

7

⁄8 in) of

tube inside the pumphead may result in reduced tube life.

 Open the lower spring-loaded tube clamp and locate the tubing, with the first

225mm (8

7

⁄8 in) length mark aligned to the inside face of the spring-loaded

part of the tube clamp. Release the clamp.

 Disengage the rotor clutch by fully depressing the yellow clutch button on the

side of the rotor hub and turning the hub a few degrees while the clutch button
is still depressed. The rotor can now rotate independently of the gearbox and
motor for one full revolution. If the clutch re-engages before tube fitting is
complete, depress the clutch button again and turn the rotor a few degrees.

 Feed the tubing around the pumphead track, turning the rotor as necessary.

Make sure the tubing is not twisted or pinched between the guide rollers and
the track. Ensure that the second 225mm (8

7

⁄8 in) mark is adjacent to the

inner edge of the upper tube clamp.

 Open the upper spring-loaded tube clamp and locate the tubing into it, making

sure there is no residual twist in the tubing, and that the tube sits centrally
between the tube guide rollers. Release the clamp.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 85

 The spring-loaded tube clamps must grip the tubing tightly enough to stop it

moving in and out of the pumphead but must not over-squeeze the tube and
throttle fluid flow. The tubing clamps are fitted with yellow sliders which can be
clicked into two positions while the clamps are held open: the outer position
will allow the clamps to grip the tube tightly; the inner will grip the tube loose­ly. Adjust the sliders to prevent tube movement during a few trial rotations of
the rotor.

 Close the guard, pushing it fully home until the latch engages.
 Connect suitable pipework to the pumphead tubing using appropriate connec-

tors.

 Remember, when using Marprene or Bioprene tubing, re-tension the tubing

after 30 minutes of running, as it may grow in length as it beds in. Re-tension
so that 225mm (8

7

⁄8 in) of tubing sits between the inside faces of the spring-

loaded parts of the tube clamps.

29.3 520RE: fitting the drain port

The drain port is an optional extra, supplied with the pumphead. It is strongly rec­ommended that users fit it before the pump is operated. It may be done with the
rotor in position or removed.

 Remove the drain plug from the bottom of the pumphead. The drain plug is

flexible. It may be removed using finger pressure from within the pumphead,
or by accessing its flange from outside with a fingernail.

 Drop the port into position from inside the pumphead.
 Fit the supplied port retaining nut (

3

⁄8 in BSP) and finger-tighten.

 Fit drainage pipework as required (not supplied).

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 86

29.4 520RE Element loading

520RE tubing element pumpheads are factory-set to accept Watson-Marlow 2.4mm­wall tubing elements. Elements fitted with either quick-release industrial connectors
or Tri-clamp sanitary connectors may be used; however, it is vital to match the
pressure rating of the element with the pressure rating of the pumphead so
that the correct roller-spring rate and occlusion settings are used. The pressure rat­ing of the pumphead appears on the flexible rotor cap in the centre of the rotor. The
pressure rating of the element appears on the connector sleeve.

Note that the rotor cap and the element connector sleeve are colour-coded.

Note: To achieve 4 bar and 7 bar pressures using a 520RE pump and the appropri­ate rotor and element, the pump must rotate counter-clockwise.

Element and rotor pressure ratings

Colour of flexible rotor cap and element connector sleeve

Grey Beige Blue

520REL

Pressures

up to 2 bar (30 psi)

Bore sizes

3.2mm, 6.4mm and

9.6mm

520REM

Pressures

up to 4 bar (60 psi)

Bore sizes

3.2mm and 6.4mm

520REH

Pressures

up to 7 bar (100 psi)

Bore size

3.2mm

Industrial

Marprene

TL

Pumpsil

Neoprene

Chem-Sure

Sanitary

Bioprene

TL

Pumpsil

Sta-Pure

Chem-Sure

Industrial

Marprene

TM

Chem-Sure

Sanitary

Bioprene

TM

Sta-Pure

Industrial

Marprene

TH

Sta-Pure

Sanitary

Bioprene

TH

Sta-Pure

Element connectors for industrial and sanitary use

Industrial Sanitary

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 87

Check that the conical connector sleeve of the element
to be fitted is the same colour as the pumphead rotor
cap

520RE element loading procedure

Note: The element loading procedure is the same for industrial (pictured) and san-

itary elements.

 Select an appropriate Watson-Marlow 520RE tubing element, paying attention

to pressure capability, bore size, tubing material and type of connector. See the
table above for pressure ratings. Check that the connector sleeve of the
element to be fitted is the same colour as the pumphead rotor cap.

 Slide the connector D-flange at one end of the element into the lower connec-

tor D-slot.

 Disengage the rotor clutch by fully depressing the yellow clutch button on the

side of the rotor hub and turning the hub a few degrees while the clutch button
is still depressed. The rotor can now rotate independently of the gearbox and
motor for one full revolution. If the clutch re-engages before tube fitting is
complete, depress the clutch button again and turn the rotor a few degrees.

 Feed the tubing element around the pumphead track, turning the rotor as nec-

essary. Make sure the tubing is not twisted or pinched between the guide
rollers and the track.

 Slide the second connector D-flange into the upper connector D-slot.
 Check that the element lies in the middle of the track and that the connectior

flanges are pushed fully home.

 Close the guard, pushing it fully home until the latch engages.
 Connect suitable pipework to the pumphead tubing using appropriate connec-

tors. See below.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 88

29.5 520RE Element connection

Select suitable tubing to connect to the tubing element supply and discharge con­nectors. Check that its pressure rating is appropriate to the application.

Sanitary 3⁄4in mini-Tri-clamp connectors

Sanitary connectors are connected to a tubing system using mini-Tri-clamps and
gaskets.

 Hold the connector end of the supply or discharge tube against the element

connector, with a gasket between them.

 Use a Tri-clamp to engage both flanges squarely, close it and tighten.

Industrial quick-release connectors

Industrial connectors are connected to a tubing system using quick-release fittings.

 Hold the pump securely and push the female fitting (available from Watson-

Marlow Bredel) over the element until it clicks into place.

 To disconnect, hold the pump securely and pull the connector outer sleeve and

twist counter-clockwise while pulling the female connector away.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 89

30 520R, 520R2 and 520RE
maintenance

 As part of regular cleaning and maintenance (and at least every three months),

lubricate the pivot points, the follower rollers and the tube guide rollers with
Ultra Lube (PA 1240), which is a non-toxic perfluoroether-based grease.

 The stainless steel pumping rollers run on externally-sealed bearings and are

lubricated for life.

 Check that the pumphead track, rotor, rollers and spring-loaded tube clamps (if

fitted) are clean and operating properly.

 If fluid is spilled inside the pumphead it should be cleaned as soon as possible,

as reducing exposure time to contamination will prolong pumphead service life.

 To clean the pumphead, remove the rotor as described under Rotor removal,

above. Flush the pumphead out with water and mild detergent, or suitable
cleaning agent. Clean the rotor and rollers in the same way. If specific cleaning
agents are required to clean the spillage, consult the general guide to cleaning
with solvents below or Watson-Marlow after-sales office before proceeding, in
order to confirm chemical compatibility. Note: the pumphead guard, rotor cap
and clutch boot should be removed in advance of some cleaning regimes. See
the table below. These components are available as spares if damaged.

 Replace the rotor as described under Rotor replacement, above.

Always isolate the pump from the mains power supply
before opening the guard or performing any positioning,
removal or maintenance activity.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 90

General guide to cleaning with solvents

31 520R, 520R2 and 520RE rotor
settings

520R, 520R2 and 520RE pumpheads are factory-set to give optimum tube life with
Watson-Marlow tubing and elements. Radial roller positions should not be adjusted
in any circumstances as this will adversely affect pumphead performance and inval­idate warranty. Tamper-proof rotor arm occlusion setting screws are fitted to warn
operators from occlusion adjustment. Tubing with a wall thickness other than 1.6mm
or 2.4mm can be used only with a pumphead set up for that purpose during manu­facture. Contact Watson-Marlow after-sales.

Chemical Cleaning precautions

Aliphatic hydrocarbons

Remove guard. Minimize rotor cap and clutch
boot exposure to less than one minute
(risk of attack).
Re-lubricate follower and tube guide rollers.

Aromatic hydrocarbons

Remove guard. Minimize rotor cap and clutch
boot exposure to less than one minute
(risk of attack).
Re-lubricate follower and tube guide rollers.

Ketone solvents

Remove guard. Minimize rotor cap and clutch
boot exposure to less than one minute
(risk of attack).
Re-lubricate follower and tube guide rollers.

Halogenated/chlorinated
solvents

Not recommended: possible risk to
polycarbonate tube clamp adjusters and
polypropylene tube clamp locators.

Alcohols, general

No precaution necessary.
Re-lubricate follower and tube guide rollers.

Glycols

Minimize rotor cap and clutch boot exposure to
less than one minute (risk of attack).
Re-lubricate follower and tube guide rollers.

Ester solvents

Remove guard. Minimize rotor cap and tube
clamp location cap exposure to less than one
minute (risk of attack).
Re-lubricate follower and tube guide rollers.

Ether solvents

Not recommended: possible risk to
polycarbonate tube clamp adjusters and
polypropylene tube clamp locators.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 91

32 Pumphead spares

Parts may be ordered individually.

053.1011.100 520R

053.1011.2L0 520R2

053.1011.EL0 520REL

053.1011.EM0 520REM

053.1011.EH0 520REH

1 MNA2050A (520R, 520R2) Pumphead guard complete with

tool-unlockable latch

2 MNA2045A (520R, 520R2) Track assembly for cased

pumps complete with spring­loaded tube clamps

3 MNA2076A (520R - 1.6mm wall tube)

MNA2077A (520R2 - 2.4mm wall tube)
MNA2148A (grey) (520REL)
MNA2149A (beige) (520REM)
MNA2150A (blue) (520REH)

Rotor cover, rotor cap and
clutch button

4 MN2011M

S60022

Clutch
Clutch spring

5 MNA2043A (520R - 1.6mm wall tube)

MNA2001A (520R2 - 2.4mm wall tube)
MNA2138A (520REL - 0-2 bar, 0-30 psi)
MNA2139A (520REM - 2-4 bar, 30-60 psi)
MNA2140A (520REH - 4-7 bar, 60-100 psi)

Rotor assembly complete with
pumping rollers, follower rollers
and tube guide rollers

6 MNA2006A (520R, 520R2)

MN2002M (520R, 520R2)
MN2131M (520RE)

Bottom (LH) tube clamp
Tube clamp location plug
Drain plug

7 MNA2005A (520R, 520R2)

MN2002M (520R, 520R2)

Top (RH) tube clamp
Tube clamp location plug

8 MN2034B

MN2005M

Guard latch spring
Guard latch spring cartridge

9 MNA2147A (520RE) Pumphead guard complete with

seal and tool-unlockable latch

10 MNA2144A (520RE) Track assembly for cased

pumps

11 MN2023T and MN2003T (520RE) Drain port and nut

520R/520R2 520REL/520REM/520REH

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 92

33 Flow rates

Pumping conditions

For precise and repeatable performance it is important to determine flow
rates under operating conditions for each new piece of tubing.

When rotating counter-clockwise, 520R, 520R2 and 520RE pumpheads’
flow rates are directly proportional to rotor speed. When rotating clock­wise, 520R, 520R2 and 520RE pumpheads’ flow rates are directly propor­tional to rotor speed up to 1.5 bar; their performance above 1.5 bar should
be determined empirically.

Note: 520RE pumpheads should be used rotating counter-clockwise if pres­sures above 1.5 bar are required.

If you wish to run the pump at a speed not shown in the tables below, flow
figures can be reached by dividing the maximum flow shown in the tables
below by the maximum rpm figure, and multiplying the result by your
required speed in rpm.

Actual flow rates achieved may vary because of changes in temperature, viscosity,
inlet and discharge pressures, system configuration and tubing performance against
time. Flow rates may also vary due to normal manufacturing tolerances of the tub­ing. These tolerances will make flow rate variance more pronounced at smaller bore
sizes.

520R and 520R2

All performance figures for the 520R and 520R2 pumpheads have been recorded
against peak pipeline pressures.

Although rated to 2bar (30psi) peak pressure, this pump will generate in excess of
2bar (30psi) peak pressure if the pipeline is restricted. Where it is important that
2bar (30psi) is not exceeded, pressure relief valves should be installed in the
pipeline.

Viscosity handling is maximised by using 2.4mm wall tubing with the 520R2 pumphead.

Flow rates are normalised test values obtained using 225mm (8

7

⁄8 in) of new tubing
(measured from the inside faces of the tube clamps), and the pumphead rotating
clockwise pumping water at 20C with negligible inlet and discharge pressures.

Note: Flow rates quoted are for 1.6mm and 2.4mm wall tubes. Tubes of 0.5mm and

0.8mm bore are only available in 1.6mm wall thickness except for platinum-cured
silicone. Tubes of 9.6mm bore are only available in 2.4mm wall thickness.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 93

520RE

Performance figures for the 520REL and 520REM have been recorded against 2bar
peak pressure and 4bar peak pressure respectively.

Performance figures for the 520REH have been recorded against 7bar constant pressure.

Although the 520REL is rated to 2bar (30psi) peak pressure, the 520REM is rated to
4bar (60psi) peak pressure and the 520REH is rated to 7bar (100psi) constant pres­sure, the pumps will generate in excess of these pressures if the system pressures
exceed this. Where it is important that these rated pressures are not exceeded,
pressure relief valves should be installed in the pipeline.

Flow rates are normalised test values obtained using 520 elements and the pump­head rotating anticlockwise pumping water at 20C with negligible inlet and discharge
pressures.

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 94

520R Fluorel (ml/min)

Speed

range

1.6mm 3.2mm 4.8mm 6.4mm 8.0mm

520DuN/R, 520DuN/R2

0.1-

220rpm

0.03­70

0.13­280

0.29­630

0.51­1100

0.80­1800

520R Fluorel (USGPH)

Speed

range

1.6mm 3.2mm 4.8mm 6.4mm 8.0mm

520DuN/R, 520DuN/R2

0.1-

220rpm

0.0005-

1.1

0.002-

4.5

0.005­10

0.01­18

0.01­28

520R Neoprene, Sta-Pure, Chem-Sure, PVC, Pumpsil (USGPH)

Speed
range

0.5mm 0.8mm 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm 9.6mm

520DuN/R, 520DuN/R2

0.1-

220rpm

0.0001-

0.14

0.0002-

0.35

0.001-

1.4

0.003-

5.6

0.006-130.01-220.02-350.03­50

520R Marprene / Bioprene 64 shore tubing (USGPH)

Speed

range

0.5mm 0.8mm 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm 9.6mm

520DuN/R, 520DuN/R2

0.1-

220rpm

0.0001-

0.14

0.0002-

0.37

0.001-

1.5

0.003-

5.9

0.01-130.01-230.02-370.02­53

520R Neoprene, Sta-Pure, Chem-Sure, PVC, Pumpsil (ml/min)

Speed

range

0.5mm 0.8mm 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm 9.6mm

520DuN/R, 520DuN/R2

0.1-

220rpm

0.004-

9.5

0.01-240.04-970.18­390

0.40­870

0.70­1500

1.1-

2400

1.6-

3500

520R Marprene / Bioprene 64 shore tubing (ml/min)

Speed

range

0.5mm 0.8mm 1.6mm 3.2mm 4.8mm 6.4mm 8.0mm 9.6mm

520DuN/R, 520DuN/R2

0.1-

220rpm

0.004-

9.0

0.01-230.04-920.17­370

0.38­830

0.67­1500

1.1-

2300

1.5-

3300

Continuous tubing

Elements

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 95

520REL Neoprene,

Sta-Pure, Chem-Sure, Pumpsil

(ml/min)

520REL Marprene /

Bioprene TL

(ml/min)

Speed

range

3.2mm 6.4mm 9.6mm 3.2mm 6.4mm 9.6mm

520DuN/REL

0.1-

220rpm

0.18­390

0.70­1500

1.6-

3500

0.17­370

0.67­1500

1.5-

3300

520REM Sta-Pure, Chem-Sure

(ml/min)

520REM Marprene / Bioprene

TM (ml/min)

Speed

range

3.2mm 6.4mm 3.2mm 6.4mm

520DuN/REM

0.1-220rpm 0.18-390 0.70-1500 0.17-370 0.67-1500

520REM Sta-Pure, Chem-Sure

(USGPH)

520REM Marprene / Bioprene

TM (USGPH)

Speed

range

3.2mm 6.4mm 3.2mm 6.4mm

520DuN/REM

0.1-220rpm 0.003-6.1 0.01-25 0.003-5.9 0.01-23

520REH Marprene / Bioprene

TH, Sta-Pure (ml/min)

520REH Marprene / Bioprene

TH, Sta-Pure (USGPH)

Speed

range

3.2mm 3.2mm

520DuN/REH

0.1-220rpm 0.20-450 0.003-7.1

520REL Neoprene, Sta-Pure,

Chem-Sure, Pumpsil

(USGPH)

520REL Marprene /

Bioprene TL

(USGPH)

Speed

range

3.2mm 6.4mm 9.6mm 3.2mm 6.4mm 9.6mm

520DuN/REL

0.1-

220rpm

0.003-

6.1

0.01­25

0.03­55

0.003-

5.9

0.01­23

0.02­53

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 96

Performance curves

Marprene continuous tubing, 1.6mm wall, 200rpm, clockwise rotation

Marprene continuous tubing, 1.6mm wall, 200rpm, counter-clockwise rotation

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 97

Marprene continuous tubing, 2.4mm wall, 200rpm, clockwise rotation

Marprene continuous tubing, 2.4mm wall, 200rpm, counter-clockwise rotation

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 98

Marprene TL element, 0-2 bar (0-30psi), 200rpm, counter-clockwise rotation

Sta-Pure element, 0-2 bar (0-30psi), 200rpm, counter-clockwise rotation

Marprene TM element, 2-4 bar (30-60psi), 200rpm, counter-clockwise rotation

Sta-Pure element, 2-4 bar (30-60psi), 200rpm, counter-clockwise rotation

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 99

Marprene TH element, 4-7 bar (60-100psi), 200rpm, counter-clockwise rotation

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 100

34 Tubing and element part numbers

1.6mm wall tubing for 520R pumpheads

mm inch # Marprene Bioprene Chem-Sure

0.5

1

/50 112 902.0005.016 903.0005.016

0.8

1

/32 13 902.0008.016 903.0008.016

1.6

1

/16 14 902.0016.016 903.0016.016 965.0016.016

3.2

1

/8 16 902.0032.016 903.0032.016 965.0032.016

4.8

3

/16 25 902.0048.016 903.0048.016 965.0048.016

6.4

1

/4 17 902.0064.016 903.0064.016 965.0064.016

8.0

5

/16 18 902.0080.016 903.0080.016 965.0080.016

mm inch # PVC Fluorel Neoprene

0.8

1

/32 13 920.0008.016

1.6

1

/16 14 950.0016.016 970.0016.016 920.0016.016

3.2

1

/8 16 950.0032.016 970.0032.016 920.0032.016

4.8

3

/16 25 950.0048.016 970.0048.016 920.0048.016

6.4

1

/4 17 950.0064.016 970.0064.016 920.0064.016

8.0

5

/16 18 950.0080.016 970.0080.016 920.0080.016

mm inch # Pumpsil Sta-Pure

0.5

1

/50 112 913.A005.016

0.8

1

/32 13 913.A008.016

1.6

1

/16 14 913.A016.016 960.0016.016

3.2

1

/8 16 913.A032.016 960.0032.016

4.8

3

/16 25 913.A048.016 960.0048.016

6.4

1

/4 17 913.A064.016 960.0064.016

8.0

5

/16 18 913.A080.016 960.0080.016

Note: 1.6mm wall Chem-Sure and Sta-Pure tubing are supplied in 305mm
lengths.