620DuN
Watson-Marlow 620DuN, 620Du, 620UN, 620U, 620S User Manual
...
Watson-Marlow 620DuN and 620Du User Manual 1
WATSON-MARLOW BREDEL MANUALS
Watson-Marlow
620DuN / 620Du pumps
m-620dun-du-gb-02
1 Declaration of conformity 3
2 Declaration of incorporation 3
3 Five-year warranty 3
4 When you unpack your pump 4
5 Information for returning pumps 5
6 Peristaltic pumps - an overview 5
7 Safety notes 6
8 Pump specifications 8
8.1 Pressure capability 12
8.2 Dimensions 13
9 Good pump installation practice 14
9.1 General recommendations 14
9.2 Do’s and do not’s 15
10 Connecting this product to a
power supply 16
11 Start-up check list 17
12 Switching the pump on for the
first time 17
13 Switching the pump on in
subsequent power cycles
(if not in auto-restart mode) 19
14 Manual operation 20
14.1 Keypad functions 20
14.2 Speed 22
14.3 Direction 22
14.4 Keypad lock 23
14.5 Keypad beep 23
14.6 Manual operation and
remote digital inputs
and outputs 23
14.7 Backlight 24
14.8 Auto-restart 24
15 Main menu 25
15.1 Keypad functions in
menu screens 25
15.2 Main menu entry 25
16 Pin-secure process protection 27
17 Head and tubing calibration 28
18 Setup 31
18.1 Trim 32
18.2 Analogue 33
18.2.1 Input 1: speed 34
18.2.2 Scaling - stroke 35
18.2.3 Trim 36
18.2.4 Exit 36
18.3 Display 36
18.4 Pump I/D 37
18.5 Baud 38
18.6 Stop bits 38
18.7 Xon/Xoff 38
18.8 Flow units 39
18.9 Run time 40
18.10 Outputs 40
18.11 Remote stop 42
18.12 Auto-restart 43
18.13 Set maximum allowed
speed 44
18.14 Set minimum allowed
speed 44
18.15 Scrolling 45
18.16 Date and time 45
18.17 Backlight 46
18.18 ROM 46
18.19 Language 47
18.20 Defaults 47
18.21 Beep 48
18.22 Security code 49
18.23 Exit 50
19 Pin out details 50
20 MemoDose 52
20.1 Changing dosing speed 53
20.2 Footswitch operation and
other remote inputs and
outputs with MemoDose 54
21 Exit 54
22 Automatic control wiring using the
620N module 55
22.1 620N module removal and
replacement 55
22.2 Wiring up 56
22.3 Speed: analogue input 59
22.4 Scaling: analogue input 60
22.5 Speed: analogue output 61
22.6 Tachometer frequency
output 61
22.7 Run/stop input 62
22.8 Direction input 62
22.9 Auto / manual toggle
input 63
22.10 MemoDose input 63
22.11 Leak detection input 63
22.12 Outputs 1, 2, 3, 4 64
Contents
Watson-Marlow 620DuN and 620Du User Manual 2
22.13 Supply voltages 64
22.14 RS485 input 65
23 Automatic control wiring
without the 620N module 66
23.1 Speed: analogue input 1 68
23.2 Scaling: analogue input 2 69
23.3 Speed: analogue output 70
23.4 Tachometer frequency
output 70
23.5 Run/stop input 71
23.6 Direction input 71
23.7 Auto / manual toggle
input 72
23.8 MemoDose input 72
23.9 Leak detection input 73
23.10 Pump status outputs 74
23.10.1 Logic output 1 74
23.10.2 Logic output 2 75
23.10.3 Logic output 3 76
23.10.4 Logic output 4 76
23.11 Supply voltages 77
24 Automatic control and operation 78
25 Network control and operation 80
25.1 RS232 and RS485
command strings 82
26 Troubleshooting 83
26.1 Error codes 84
27 Drive maintenance 85
28 Drive spares 85
29 620RE, 620RE4 and 620R
pumpheads 86
29.1 620RE, 620RE4 and 620R
Key safety information 86
29.2 620RE, 620RE4 and 620R
safe-guarding 86
29.3 620RE, 620RE4 and 620R
pumping conditions 87
29.4 620RE, 620RE4 and 620R
pump installation 87
29.5 620RE, 620RE4 and 620R
general operation 88
29.6 620RE and 620RE4
tube element loading 89
29.7 620R continuous
tube loading 90
29.8 620RE, 620RE4 and 620R
tube element or
continuous tube removal 91
29.9 620RE, 620RE4 and 620R
maintenance 91
29.10 620RE, 620RE4 and 620R
CIP and SIP 94
29.11 620RE, 620RE4 and 620R
pumphead spares 95
30 620RE, 620RE4 and 620R
performance data 97
30.1 620RE, 620RE4 and 620R
flow rates 98
31 620R continuous tubing
product codes 100
32 620RE and 620RE4 LoadSure
tube element product codes 101
33 620L and 620LG pumpheads 102
33.1 620L and 620LG key
safety information 102
33.2 620L and 620LG guarding102
33.3 620L and 620LG pumping
conditions 103
33.4 620L and 620LG
removal and installation 103
33.5 620L and 620LG
tube loading 105
33.6 620L and 620LG care
and maintenance 106
33.7 620L and 620LG
track adjustment 106
33.8 620L and 620LG
pumphead spares 107
34 620L and 620LG
performance data 108
34.1 620L and 620LG
flow rates 108
34.2 620L tubing codes 109
34.3 620LG element codes 110
35 Pumping accessories 110
36 Trademarks 111
37 Warning not to use pumps in
patient-connected applications 111
38 Publication history 111
39 Decontamination certificate 112
Watson-Marlow 620DuN and 620Du User Manual 3
1 Declaration of conformity
This declaration was issued for Watson-Marlow 620DuN and 620Du pumps
on September 19, 2005. When this pump unit is used as a stand-alone
pump it complies with: Machinery Directive 98/37/EC, Low Voltage
Directive 73/23/EC, EMC Directive 89/336/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 98/37/EC
BS EN 60204-1.
Responsible person: Christopher Gadsden, Managing Director, Watson-Marlow
Limited, Falmouth, Cornwall TR11 4RU, England. Telephone +44 (0) 1326 370370
Fax +44 (0) 1326 376009.
The information in this user guide is believed to be correct at the time of publication. However, Watson-Marlow Limited accepts no liability for errors or omissions.
Watson-Marlow Bredel has a policy of continuous product improvement, and
reserves the right to alter specifications without notice. This manual is intended for
use only with the pump it was issued with. Earlier or later models may differ. The
most up-to-date manuals appear on the Watson-Marlow website:
http://www.watson-marlow.com
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.
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Watson-Marlow 620DuN and 620Du User Manual 4
Conditions of and specific exceptions to the above warranty are:
Conditions
Products must be returned by pre-arrangement, carriage-paid, to WatsonMarlow, 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.
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 list, below.
Packaging disposal
Dispose of packaging materials safely, and in accordance with regulations in your
area. 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
620Du and 620DuN pumps are available in two forms, dedicated to either 620R
series pumpheads or 620L series pumpheads. Pumps are supplied as:
Dedicated 620R pump drive unit fitted with 620R, 620RE or 620RE4 pumphead
(see 8. Pump specifications); OR: Dedicated 620L pump drive unit fitted with
620L or 620LG pumphead (see 8. Pump specifications)
A 620N module providing pump ingress protection to IP66, NEMA 4X, if a
620DuN.
Note: the module is attached for transit, but must be removed to allow wiring
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Watson-Marlow 620DuN and 620Du User Manual 5
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.
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.
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.
6 Peristaltic pumps - an overview
Peristaltic pumps are the simplest 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
run dry.
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
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Watson-Marlow 620DuN and 620Du User Manual 6
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.
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 Limited, the protection provided by the pump may be
impaired.
Any person who is involved in the installation or periodic maintenance of this equipment should be suitably skilled or instructed and supervised using a safe system of
This symbol, used on the pump and in this manual,
means: Caution, risk of electric shock.
This symbol, used on the pump and in this manual,
means: Caution, refer to accompanying documents.
This symbol, used on the pump and in this manual,
means: Do not allow fingers to contact moving parts.
There is a user-replaceable type T5A H
250V fuse in the fuseholder in the centre of
the switchplate at the back of the pump.
The 620N module must be removed, if a 620DuN, to allow
access to the switchplate. See 22.1 620N module removal and
replacement. There are thermal fuses within the pump which
self-reset within 60 seconds; if they trip an error code is displayed. This pump contains no user-serviceable fuses or parts.
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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.
Watson-Marlow 620DuN and 620Du User Manual 7
work. In the UK this person should also be familiar with the Health and Safety at
Work Act 1974.
There are moving parts inside the pumphead. Before opening the toolunlockable fixed guard (620R) or tool-unlockable track (620L), ensure that
the following safety directions are followed.
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 fixed guard. Note that guards differ, depending on the type of
pumphead. See the pumphead sections of this manual: 29 and 33.
Secondary operator protection from rotating parts of the pump is provided by
indicator-only switching of the pumphead guard. This function will stop the
pump if the guard is inadvertently opened while the pump is running. For
details of permissible pumphead orientations, see the pumphead sections of
this manual: 29 and 33.
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. The pump’s mains plug is the disconnecting device (for iso-
lating the motor drive from the mains supply in an emergency). Do not position the
pump so that it is difficult to disconnect the mains plug. 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.
No attempt should be made to run the drive without a pumphead fitted.
The pump weighs more than 18kg (the exact weight depends on model and pumphead—see 8 Pump specifications). Lifting should be performed according to standard
Health and Safety guidelines. Finger recesses are built into the sides of the lower
shell for convenience in lifting; in addition, the pump can conveniently be lifted by
grasping the pumphead and (where fitted) the 620N module at the rear of the pump.
This product does not comply with the ATEX directive
and must not be used in explosive atmospheres.
Fundamental work with regard to lifting,
transportation, installation, starting-up,
maintenance and repair should be performed by qualified personnel only. The unit must be isolated
from mains power while work is being carried out.
Watson-Marlow 620DuN and 620Du User Manual 8
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 620N
module is removed. The picture below is how a 620Du looks from the box. The number of connectors varies according to the model.
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620DuN, IP66 NEMA 4X model and 620Du, IP31 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.
Analogue control
The pump speed can be controlled through an analogue signal input in the
ranges 0-10V, 1-5V or 4-20mA. Scaling can be controlled similarly using
Analogue signal input 2.
Watson-Marlow 620DuN and 620Du User Manual 9
Outputs
A 0-10V, 4-20mA or 0-1478Hz 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 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.
Serial communications
Full pump control from a PC or other controller with the ability to network up to
16 pumps (620Du) or 32 pumps (620DuN).
Guard switch
Primary operator protection from rotating parts of the pump is provided by the
fixed guard. Secondary operator protection from rotating parts of the pump is
provided by indicator-only switching of the pumphead guard.
PIN-secure process protection
Two levels of control protection: main PIN code and user PIN code.
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 of 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)
IP (Ingress Protection) and NEMA definitions
* 620 cased pumps are rated to NEMA 4X (indoor use) only.
Watson-Marlow 620DuN and 620Du User Manual 10
Control range (turndown ratio) 0.1-265rpm (2650:1)
Supply voltage/frequency Filtered 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
conforming to the best practice of noise
immunity
Installation category
(overvoltage category)
II
Power consumption 250VA
Full load current <1.1A at 230V; <2.2A at 115V
Eprom version Accessible through pump software
Enclosure rating - 620DuN
IP66 to BS EN 60529; Equivalent to
NEMA 4X to NEMA 250* (indoor use).
Suitable for heavy industrial, process
and filthy environments. The drive uses
a Gore membrane vent to equalise the
pressure inside the enclosure and to
prevent ingress of water and corrosive
vapours.
Enclosure rating - 620Du
IP31 to BS EN 60529. Equivalent to
NEMA 2, suitable for indoor use.
Protected against dripping water and
falling dirt. May be wiped with a damp
cloth, but should not be immersed.
Pumphead options (620R models) 620R, 620RE, 620RE4
Pumphead options (620L models) 620L, 620LG
Operating temperature range 5C to 40C, 41F to 104F
Storage temperature range -25C to 65C, -13F to 149F
Maximum altitude 2,000m, 6,560ft
Humidity (non-condensing)
(620Du)
80% up to 31C, 88F, decreasing
linearly to 50% at 40C, 104F
Humidity (condensing) (620DuN) 10% - 100% RH
Weight See table on previous page
Noise <70dB(A) at 1m
Pump specifications
* Protect from prolonged UV exposure.
Watson-Marlow 620DuN and 620Du User Manual 11
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 EN 61000-6-4
Radiated emissions:
BS EN 55011 A1 and A2, Class A, called by BS EN 61000-6-4
Electrostatic discharge: BS EN 61000-4-2 A1 and A2
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 testing:
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 Ed 2
Safety of machinery—basic concepts, general principles of
design: BS EN 292-1 and BS EN 292-2
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
Standards
Watson-Marlow 620DuN and 620Du User Manual 12
8.1 Pressure capability
0-4 bar higher pressure pumping
This pump’s default running speed is 165rpm. It can be run at any speed up to
265rpm. Please note, however:
The 620RE and 620RE4 rotor warranty is limited to 2 bar from 165rpm
to 265rpm.
A warning is displayed when the user sets the speed above 165rpm.
Note: Applies to 620RE MarkII and 620RE4 MarkII pumpheads only. (The
620LG is not limited).
The pump’s software records the duration of operation above 165rpm.
0-2 bar pressure pumping
Watson-Marlow 620DuN and 620Du User Manual 13
Drive only + 620R, 620RE + 620RE4 + 620L, 620LG
IP31 16.5kg, 36lb 6oz 19.6kg, 43lb 3oz 20.1kg, 44lb 5oz 24.3kg, 53lb 9oz
IP66 NEMA 4X 17.4kg, 38lb 6oz 20.5kg, 45lb 3oz 21.0kg, 46lb 5oz 25.2kg, 55lb 9oz
Unit weights
8.2 Dimensions
Watson-Marlow 620DuN and 620Du User Manual 14
9 Good pump installation practice
9.1 General recommendations
Position
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 flow of air around the pump to ensure that heat can
be dissipated. Ensure that the temperature around the pump does not exceed 40C.
Do not stack other 620 pumps on top of this pump. It is, however, acceptable to
stack other equipment on the upper surface of the 620 (as long as the ambient temperature does not exceed 40C).
Emergency disconnection
The pump’s mains plug is the disconnecting device (for isolating the motor drive
from the mains supply in an emergency). Do not position the pump so that it is difficult to disconnect the mains plug. 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.
Valves
Peristaltic pumps are self-priming and self-sealing against backflow. No valves are
required in inlet or discharge lines. 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.
The pump may be set up so that the direction of rotor rotation is clockwise or counter-clockwise, whichever is convenient.
Tubing materials: run-in advice
Sta-Pure and Marprene TM tubing are hard to compress when new. When using
tubing made of these materials, the first five pumphead revolutions should be at a
speed of 10rpm or greater. If the pump is run slower, the safety system built into
pump drive’s software may cause it to stop and display an over-current error
message.
Pressure advice
In most circumstances, rotor and tube life are maximised if the pumphead is run
slowly, particularly when pumping at high pressure. However, to maintain
performance at pressures above 2 bar, avoid running the pumphead below 50rpm.
If low-flow, high-pressure operation is necessary, switching to a smaller tube is
recommended.
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Watson-Marlow 620DuN and 620Du User Manual 15
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 620N watertight module is fitted the seals are intact and
properly located. Ensure that the holes for cable glands are properly sealed to maintain the IP66 / NEMA 4X rating.
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) 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 (though see Pressure advice in
9.1 General recommendations). 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.
IP31 models may be wiped with a damp cloth, but should not be hosed or
immersed. The front of IP31 models is further protected against light spillages onto
the pump.
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 620DuN and 620Du User Manual 16
The voltage selector is mounted in the switchplate at
the rear of the pump, protected from water by the
620N module (620DuN). The module must be
removed to allow access to the switchplate. See 22.1
620N module removal and replacement. 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.
We recommend using commercially available supply voltage
surge suppression where there
is excessive electrical noise.
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Power cable: The pump is supplied fitted with either of two cable glands and
approximately 2.8m of power cable. The European cable is to Harmonised code
H05RN-F3G0.75, used with our gland part number SL0128 which is suitable for an
outside cable sheath diameter of 4-7mm. The north American cable is to type
SJTOW 105C 3-18AWG VW-1 used with our gland part number SL0123 which is suitable for an outside cable sheath diameter of 7-9mm.
Power cables of NEMA 4X specification pumps are fitted with a standard US mains
power plug. IP66 specification pumps are supplied with no plug. Wiring a mains plug
must only be undertaken by suitably skilled, qualified personnel.
DuN, Du 10 Connecting this product
to a power supply
A well regulated electrical mains supply is required along with cable connections
conforming to the best practice of noise immunity. It is not recommended to site
these drives alongside “dirty” electrical mains supplies such as 3-phase
contactors and inductive heaters without special attention being paid to
unacceptable mains-borne noise.
If the mains power cable is inappropriate for your installation, it can be changed.
Please contact your local Watson-Marlow Bredel service centre.
The voltage selector switch is not visible while the
620N module is in place. Do not switch 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 620N
module removal and replacement.
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European North American
line brown black
neutral blue white
ground green/yellow green
Conductor coding
Watson-Marlow 620DuN and 620Du User Manual 17
Input line fusing: type T5A H 250V
20mm time-delayed cartridge 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 number of starts is required.
11 Start-up check list
Note: See also 29.6, 29.7, 29.8 and 33.5, Tube loading.
Ensure that proper connections are achieved between the pump tube and
suction and discharge piping.
Ensure proper connection has been made to a suitable power supply.
Ensure that the recommendations in section 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 26.1 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.
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Watson-Marlow 620DuN and 620Du User Manual 18
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 18.19 Language.)
The pump displays the Watson-Marlow start-up screen for four seconds,
followed 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 default
speed setting is 165rpm, but 265rpm is available (see 18.13 Set maximum
allowed speed). Other initial start-up operational parameters are listed in the
table below.
First-time start-up defaults
Language Not set Analogue input 4-20mA
Speed 165rpm User trim None
Direction Clockwise Remote stop Open=run
Pumphead 620R Pump number 1
Tube size 15.9mm Baud rate 9600
Calibration 620R 15.9mm tube 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 changed 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 620DuN and 620Du User Manual 19
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 26.1 Error codes.
The pump displays the Watson-Marlow start-up screen for four seconds
followed by the pump model identity screen for four seconds, and then the
manual mode main screen.
Note: Once in the manual mode main screen, keys assume their normal func-
tions - see 15.1 Keypad in menu screens 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 below.
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Watson-Marlow 620DuN and 620Du User Manual 20
14 Manual operation
14.1 Keypad functions
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. If a padlock icon
( ) shows, it indicates that
Keypad lock is on.
Note: A number of the controls
listed below are shortcuts to commands which are also available
through the Main menu. See 15
Main menu.
Note: SHIFT gives access to functions which appear on the upper
part of numeric keys. To access the
MAX function, for example, press
SHIFT once and release it. A sym-
bol appears in the bottom left of the display to indicate that the next keypress will
be SHIFTed. Press 4 (MAX).
A brief single press on each key triggers a beep sound (if enabled - see 14.5 Keypad
beep) and causes the pump to function as follows:
START: starts the pump at the speed and in the direction shown on the display. The rotation symbol will become animated to confirm that the pump is
operating.
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. The default can be altered from within the
Setup menu (see 18.3 Display).
MAX (SHIFT, 4): while pressed, MAX (SHIFT, 4) 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 MAX (SHIFT, 4) until fluid flows
through the pump and reaches the point of discharge, and then releasing MAX
(SHIFT, 4).
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Watson-Marlow 620DuN and 620Du User Manual 21
AUTO (SHIFT, 9): has no effect if the pump is running in auto mode. Stops
the pump if it is running in Manual mode and displays a screen offering three
choices: manual control, analogue control or network 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 serial communications signal applied to the pump, and
in the direction shown in the display.
MAN (SHIFT, 6): stops the pump if it is running in an auto mode and displays
the manual mode main screen. Has no effect if the pump is already running in
manual mode.
STOP: if the pump is running, pressing 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 0.1rpm, or
other steps as pre-selected in the Scrolling section of Setup (18.15), (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: If the pump’s flow rate has been calibrated (see 17 Calibration), 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
0.1rpm, or other steps as pre-selected in the Scrolling section of Setup
(18.15). If the pump is then started by pressing the START key, it operates at
the new speed. The minimum speed possible is 0.1rpm. If the pump is running
when DOWN is pressed, the change takes effect immediately.
Note: If the pump’s flow rate has been calibrated (see 17 Calibration), 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 0.1rpm (or any other minimum
displayed unit of speed as selected in the Scrolling section of Setup (18.15)) to
0rpm 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.
Note: If a minimum allowed speed has been set in the Set Min Speed section
of the Setup menu, the above note on speed reduction to 0rpm does not apply.
DIRECTION (SHIFT, 1): 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.
ENTER: is used to enter/confirm numeric and menu selections. Also cycles the
information shown on the manual mode main screen exactly as START does,
whether the pump is running or not. See START, above.
MENU (SHIFT, 7): causes the main menu to be displayed, from which all
aspects of pump setup can be controlled. See 15 Main menu.
CLEAR (SHIFT, 5): clears numeric entries so that they can be entered again.
CAL (SHIFT, 8): takes the user to the calibrate sequence.
. (decimal point, period) (SHIFT, 0): used in numeric expressions as a
decimal point. To enter 5.3, press 5, SHIFT, 0, 3. (Some languages use ,
(comma) to represent a decimal point. This pump uses .)
Watson-Marlow 620DuN and 620Du User Manual 22
Keypress combinations cause the pump to function as follows:
Note: A number of the controls listed below are shortcuts to commands which are
also available through the Main menu. See 15 Main menu.
UP and 1 (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 UP while the pump is stopped: turns the display backlight on.
STOP and DOWN while the pump is stopped: turns the display backlight off.
SHIFT and UP: sets the pump to maximum allowed speed. Note: Unlike its
action elsewhere, SHIFT must be pressed and held. Note: The MAX key has a
similar function, but causes the pump to run at maximum allowed speed only
while the key is pressed.
SHIFT and DOWN: sets the pump to minimum allowed speed. Note: Unlike its
action elsewhere, SHIFT must be pressed and held.
1 (DIRECTION) and DOWN, pressed simultaneously: interrupts the display to
show the pump’s ROM version for four seconds.
START pressed and held for four 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.
14.2 Speed
To change the running speed:
Use the UP and DOWN keys to change the pump’s running speed within limits
of 0.1 rpm or other minimum allowed speed and the maximum allowed speed.
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.
Note: The maximum allowed speed of the drive defaults to 165rpm. It is possible
to set this limit at any speed up to 265rpm. See 18.13 Set maximum allowed speed,
and section 3 Three-year warranty.
14.3 Direction
To toggle the pump’s rotation sense:
Press DIRECTION (SHIFT, 1) to toggle the pump between clockwise and
counter-clockwise rotation.
Note: Direction control is available subject to access not being limited by security
code. See 18.22 Security code.
Watson-Marlow 620DuN and 620Du User Manual 23
14.4 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.
Note: Keypad lock is available subject to access not being limited by security
code. See 18.22 Security code.
14.5 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 1 (DIRECTION) keys while switching on the mains power
switch at the rear of the pump.
See 18.21 Beep.
14.6 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 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.
(620DuN) 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. See 22.7
Run/stop input.
(620Du) If you invert the operation of the remote run/stop switch to operate as
open=stop, you must connect pin 7 to pin 19, lower D-connector, to be able to start
the pump from the keypad. See 22.7 Run/stop input.
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 620DuN and 620Du User Manual 24
14.7 Backlight
To turn the display backlight on:
Depress the STOP and UP keys together.
To turn the display backlight off:
Depress the STOP and DOWN keys together.
See 18.17 Backlight.
14.8 Auto-restart
This pump offers an auto-restart feature. When active on power loss, it will restore
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.
To turn the auto-restart facility on:
Turn off the mains power switch at the rear of the pump.
Depress the START key while switching on the mains power switch at the rear
of the pump.
To turn the auto-restart facility off:
Turn off the mains power switch at the rear of the pump.
Depress the STOP key while switching on the mains power switch at the rear
of the pump.
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 620DuN and 620Du User Manual 25
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 per-
sonal 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.
15.2 Main menu entry
MENU (SHIFT, 7) displays the main menu and stops the pump if it is running in
Manual mode. It operates at any point in the pump’s activity except where error
screens are displayed, where UP and DOWN keys are used to enter values, or
where a PIN is requested.
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 23 headings:
Trim, Analogue, Display, Pump I/D, Baud, Stop bits, Xon/Xoff, Flow units, Run time,
Outputs, Remote stop, Auto-restart, Set max speed, Set min speed, Scrolling,
Date/time, Backlight, ROM, Language, Defaults, Beep, Security code and Exit.
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Watson-Marlow 620DuN and 620Du User Manual 26
Pin out details
Selecting Pin out details causes the pump to display an information screen and
then its preset pin and voltage details under 19 headings: Analogue input 1,
Analogue input 2, Analogue output, Tacho output, Direction enable, Direction input,
Run/Stop input, Leak input, Auto/Man toggle, Dose input, Output 1, Output 2,
Output 3, Output 4, Supply, 0 volts, Earth, Others and Exit.
Pin out information is not relevant to the 620DuN IP66/NEMA 4X pumps. 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 previously dispensed 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.
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Watson-Marlow 620DuN and 620Du User Manual 27
16 PIN-secure process protection
The 620DuN and 620Du 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.
The main code gives access to Calibrate, Setup, Direction change 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 18.22 Security code.
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 (SHIFT, 7) 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
Cal (SHIFT, 8) Available Available Not available
Accept Available Available Not available
Change Main PIN needed
Main PIN or User
PIN needed
Not available
Max (SHIFT, 4) Available Available Not available
Dir (SHIFT,1) Main PIN needed
Main PIN or User
PIN needed
Not available
Auto (SHIFT, 9) Available Available Not available
Man (SHIFT, 6) Available Available Not available
Up Available Available Not available
Down Available Available Not available
SHIFT and Up Available Available Not available
SHIFT and Down Available Available Not available
Start Available Available Available
Stop Available Available Available
Enter Available Available Not available
MemoDose Available Available Available
Keypad lock Main PIN needed
Main PIN or User
PIN needed
Main PIN or User
PIN needed
Auto-restart Available Available Available
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Watson-Marlow 620DuN and 620Du User Manual 28
17 Head and tubing calibration
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 18.22 Security code. 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.
Alternatively ...
Press CAL (SHIFT, 8) to enter the calibration screen from the main running
screen, and return there after calibrating.
Then:
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. The pump displays the main running screen.
If Change is selected with a security code in place, the pump starts its security
code entry sequence. See 18.22 Security code. 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.
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Watson-Marlow 620DuN and 620Du User Manual 29
Head and tube
If Head and tube is selected, the pump displays a list of standard pumpheads
that can be fitted to the pump.
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 620DuN and 620Du User Manual 30
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 (SHIFT, 1) key, and to change the speed of rotation using the
numeric keys (followed by ENTER), or the UP and DOWN keys, within the
minimum and maximum limits that have been set. See 18.13 Set maximum
speed and 18.14 Set minimum 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.
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