Professional Weighing
Equipment
MRW SERIES intelligent weighing machine
WASHDOWN WEIGHING SCALE - Dust and Waterproof Scale IP65
WITH PIECE COUNTING FUNCTION
Operating Manual
1
Mark applied
EU Directive
Standards
2004/108/EC
EN 61326-1: 2006
Imperial version
Metric version
MRW-3 MRW-1500
MRW-7 MRW-3000
MRW-15 MRW-7500
MRW-33 MRW-15k
Declaration of Conformity
Declaration of conformity for apparatus with CE mark
We hereby declare that the product to which this declaration refers conforms to the following
standards.
Electronic scale: MRW Washdown Scales
Date: 14. 11. 2012 Signature:
Boon Lim, R & D Manager
LW Measurements LLC, 3510 Industrial Drive, Unit H Santa Rosa, CA 95403
2
Identification
Customer Service
USA
LW Measurements LLC, 3510 Industrial Drive,
Unit H Santa Rosa, CA 95403
USA
Tel: (707) 542-2185
FAX: (707) 542-3285
EUROPE
LW Measurements Europe Ltd
Chalkwell Park House 700 London Road
Westcliff-on-Sea Essex SS0 9HQ
United Kingdom
Tel: 01702-476700
Fax: 01702-477380
ASIA
LW Measurements PTY Ltd
Block 1004, Toa Payoh North
#03-16 Singapore 318995
Tel: (65) 6458 3438
HP: (65) 8119 3401
http://lwmeasurements.com
Refer to our website for information about local customer service centers and details of their
addresses.
3
Introduction
What you should know about these Operating Instructions:
Tree® Professional Weighing Equipment products are simple to operate.
Nevertheless, you should read through these operating instructions in their entirety, so that you can make
optimum use of the full potential and the diverse possibilities of the weighing machine in your daily work.
These operating instructions contain guidance in the form of pictograms and keyboard diagrams, which
should help you in finding the required information:
For the labelling of potential hazards and advice, please see Safety below.
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Contents
Section
Heading
1
Safety
1.1 Representation and symbols
1.2 Safety recommendations
1.3 IP65 protection
2 Your weighing machine
2.1 Construction and functions
2.1.1 Construction of the weighing machine
2.1.2 Functions of the weighing machine
2.2 Application, conformity
2.2.1 Correct use of the weighing machine
2.2.2 Conformity
2.3 Data and parameters
2.3.1 Technical data
3 Getting started with your weighing machine
3.1 Unpacking the equipment
3.2 Scope of delivery
3.3 Assembling your weighing machine
3.4 Choice of a suitable location
3.5 Checking the mains voltage
3.6 Calibration of the weighing machine
4
Working with the application menu using the intelligent keypad
4.1 Display messages and key functions
4.1.1 Display messages
4.1.2 Key functions
4.2 Program options
4.2.1 Pieces counting
4.2.2 Selectable auto shut off
4.2.3 Selectable auto backlight
5 Calibration - using an external calibration weight
6
Maintenance and service
7
Transport and storage
7.1 Transportation and shipping
7.2 Storage
5
1 Safety
1.1 Representations and symbols
Important instructions, which involve safety, are highlighted with the appropriate mark:
1.2 Safety recommendations
When using the weighing equipment in surroundings with increased safety requirements, the
corresponding regulations must be observed.
The weighing machine may only be used with the power adapter supplied exclusively for use with the
weighing machine.
Before inserting the power adapter, the user must ensure that the operating voltage stated on the power
adapter agrees with the mains voltage.
If not, please contact Customer Service at the address above.
If the power adapter or its cable is damaged, the weighing machine must immediately be disconnected
from the electricity supply (pull out the power adapter).
The weighing machine may only be operated from mains electricity supply with a power adapter which is
in perfect condition.
If there should be any reason to believe that it is no longer possible to operate the weighing machine
without danger, the weighing machine is to be immediately unplugged from the electricity supply (pull out
power adapter) and secured against inadvertent operation.
In carrying out maintenance work, it is essential to follow the recommendations in Chapter 6 Maintenance
and service.
The weighing machine must not be operated in an area subject to explosion risks.
Care must be taken when weighing liquids to ensure that no liquid is spilt into the inside of the weighing
machine or into connections on the rear of the equipment or the power adapter. If liquid is spilt on the
weighing machine, it must immediately be unplugged from the mains electricity supply (pull out power
adapter).
The weighing machine may only be operated again after it has first been re-checked by a service
technician.
These operating instructions must be read by each operator of the equipment and must be available at
the workplace at all times.
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1.3 IP65 protection
Protection against solid objects
1st Digit
Description
Definition
0
Non-protected
No special protection
1
Protected against solid objects greater than
50 mm
A large surface of the body such as the hand (no protection against
deliberate access). Solid objects exceeding 50mm diameter
2
Protected against solid objects greater than
12 mm
Fingers or other objects not exceeding 80 mm in length. Solid objects
exceeding 12 mm diameter
3
Protected against solid objects greater than
2.5 mm
Tools, wires, etc of diameter or thickness greater than 2.5 mm. Solid
objects exceeding 2.5 mm diameter.
4
Protected against solid objects greater than
1.0 mm
Wires or strips of thickness greater than 1.0 mm. Solid objects exceeding
1.0 mm
5
Dust protected
Ingress of dust is not totally prevented but dust does not enter in
sufficient quantity to interfere with satisfactory operation of the equipment
6
Dust-tight
No ingress of dust
Protection against liquids
2nd Digit
Description
Definition
0
Non-protected
No special protection
1
Protected against dripping water
Dripping water (vertically falling drops)
2
Protected against dripping water when tilted
up to 15º
Vertically dripping water shall have no harmful effect when the enclosure
is tilted at any angle up to 15º from its normal position
3
Protected against spraying water
Water falling as spray at an angle up to 60º from the vertical shall have
no harmful effect
4
Protected against splashing water
Water splashed against the enclosure from any direction shall have no
harmful effect
5
Protected against water jets
Water projected from a nozzle against the enclosure from any direction
shall have no harmful effect
6
Protected against heavy seas
Water from heavy seas or water projected in powerful jets shall not enter
the enclosure in harmful quantities
7
Protected against the effects of immersion
Ingress of water in a harmful quantity shall not be possible when the
enclosure is immersed in water under defined conditions of pressure and
time
8
Protected against submersion
The equipment is suitable for continuous submersion in water under
conditions, which shall be specified by the manufacturer
Your MRW weighing machine is rated to IP65.
The IP rating system
IP stands for Ingress Protection
The rating’s first digit e.g. IP65 relates to the ingress protection against dust (6 means dust tight,
see the table below)
The second digit e.g. IP65 relates to the ingress protection against water (5 means protected
against water jets, see the table below)
7
2 Your weighing machine
Figure 2.1 Your weighing machine
3 2 1
2.1 Construction and functions
2.1.1 Construction of the weighing machine
The weighing machine consists of the weighing machine body (1), the scale-pan (2), the adapter (3) and
this operating manual.
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2.1.2 Functions of the weighing machine
Model number
Capacity
Division
Weighing pan Size
MRW-3
3 lb
0.0001 lb
165 x 175mm
MRW-7
7 lb
0.0002 lb
165 x 175mm
MRW-15
15 lb
0.0005 lb
165 x 175mm
MRW-33
33 lb
0.001 lb
165 x 175mm
Package
(Standard carton)
30.5×24×14.5(cm3)
Package
(Master carton)
4 Units in one box: 48.5 x 33 x 31(cm3)
Operating
Temperature
0-40℃(32-104℉)
Power source
6 x AA dry cells or AC/DC
Adapter 9V DC /100mA
The MRW Series are high-quality electronic precision weighing machines designed to function as
counting scales and check-weighers with the following specifications
1. Imperial weight unit version
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2. Metric weight unit version
Model number
Capacity
Division
Weighing pan Size
MRW-1500
1500 g
0.05 g
165 x 175mm
MRW-3000
3000 g
0.1 g
165 x 175mm
MRW-7500
7500 g
0.2 g
165 x 175mm
MRW-15k
15 kg
0.0005 kg
165 x 175mm
Package
(Standard carton)
30.5×24×14.5(cm3)
Package
(Master carton)
4 Units in one box: 48.5 x 33 x 31(cm3)
Operating
Temperature
0-40℃(32-104℉)
Power source
6 x AA dry cells or AC/DC
Adapter 9V DC /100mA
The built-in versatile weighing programs allow the user to use the MRW-Series weighing machines not
only for accurate weighing but also for the counting of components.
FEATURES
Auto zero tracking
Intelligent applications: weight unit conversion, parts counting
Low battery indication
Large bright backlit LCD
Large heavy gauge stainless steel square pan
Stability indication
Auto calibration
Selectable auto back light
Selectable auto shut off
Unit switching kg ,g, lb, oz, lb:oz
Variable kg or lb reference weight calibration software
Washdown model
10
Figure 2.2 Details of your weighing machine
Weighing pan
Bright back-lit display
Battery compartment cover
Battery compartment
(dry cells not included)
Adapter socket
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2.2 Application, conformity
2.2.1 Correct use of the weighing machine
The weighing machine may only be used for the weighing of solid-materials and of liquids filled into
secure containers.
The maximum allowable load of the weighing machine must never be exceeded, otherwise the weighing
machine may be damaged.
In using the weighing machine in combination with other appliances as well as with appliances produced
by other manufacturers, the appropriate regulations for the safe use of the relevant attachments and their
application in accordance with instructions must be observed.
2.2.2 Conformity
The weighing machine has been manufactured and tested in accordance with the standards and
recommendations set out in the declaration of conformity.
The power adapter produced for the operation of the weighing machine and intended exclusively for this
application, complies with the appropriate electrical protection class.
2.3 Data and parameters
2.3.1 Technical data
The following applies to all MRW series weighing machines
Power supply:
. Input: 110 or 230V AC (+/-15-20%); 50 to 60Hz
. Output: 9V DC 100mA
Allowable ambient conditions
Temperature: 0°C - 40°C
Relative humidity: 25% - 85%, non-condensing
If you have any questions on the technical data or require detailed technical information on your balance,
please contact your technical representative.
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3 Getting started with your weighing machine
Component delivered present yes / no
Weighing unit body
Weighing pan
Power adapter
Operating manual
3.1 Unpacking the equipment
The machine is delivered in an environmentally-friendly carton, specifically developed for this precision
instrument, which provides optimum protection for the balance during transportation.
We suggest that you retain the original packaging in order to avoid transportation damage if re-shipping
or transporting the balance and to allow the unit to be stored in the best conditions if it is out of operation
for an extended period.
In order to avoid damage, attention must be given to the following points when unpacking the balance:
Unpack the weighing machine carefully. It is a precision instrument.
When outside temperatures are very low, the balance should first be stored for some hours in the
unopened transport package in a dry room at normal temperature, so that no condensation settles on the
unit when unpacking.
Check the weighing machine immediately after unpacking for externally visible damage. If you should find
transport damage, please inform your service representative immediately.
If the unit is not to be used immediately after purchase but only at a later time, it should be stored in a dry
place where fluctuations in temperature are as small as possible (see Chapter 7 .Transport, storage.).
Read through these operating instructions, even if you already have prior experience with weighing
equipment, before you work with the unit and pay attention to the Safety recommendations (see Chapter
1 .Safety).
3.2 Scope of delivery
Inspect delivery for completeness immediately on unpacking all components.
Checklist for complete delivery
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3.3 Assembling your weighing machine
The weighing machine is delivered in partly dismantled condition. Assemble the individual components in
the following sequence:
Place the unit holder in position and add the weighing pan
Insert the power adapter cable plug into the socket at the rear of the balance.
3.4 Choice of a suitable location
The environment in which your weighing machine is used is very important. Air movement, temperature
changes, vibrations, direct sunlight, etc. all influence the performance of high precision weighing
machines. Therefore, place your weighing machine on a solid, sturdy surface that is free of air currents,
vibration and not in direct sunlight. The surface should not be magnetic and should be located away from
doors, windows, heaters, air conditioners and fans.
To summarize:
Put the weighing machine on a solid, firm and preferably vibration-proof, horizontal base
Make sure that the weighing machine cannot be shaken or knocked over
Protect from direct solar radiation
Avoid drafts and excessive temperature fluctuations
3.5 Checking the mains voltage
The following Safety recommendations must be observed when connecting the balance to the mains:
The balance may only be operated with the power adapter supplied.
Check before connecting the power adapter to the mains supply, that the operating voltage stated on the
power adapter agrees with the local mains voltage.
If the operating voltage is not the same as the mains voltage, the power adapter must on no account be
connected to the mains supply. Contact customer service.
3.6 Calibration of the weighing machine
Since the Earth’s gravity is not the same everywhere, each balance must be adjusted to compensate for
the gravity differences at each location in accordance with the underlying physical weighing principles.
This adjustment process, known as calibration and must be carried out on initial installation and after
each subsequent relocation.
In order to ensure exact measurements, it is recommended that the balance should be calibrated
regularly using a known external calibration weight (see Section 5 below).
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4 Working with the application menu using the Intelligent Key-Pad
4.1 Display messages and key functions
4.1.1 Display messages
1. The STABLE icon indicates when the readings stabled.
2. The ZERO icon indicates when the weights tared to zero.
3. The LO-BAT icon indicates when running out of battery.
4.1.2 key functions
1. ON/OFF key turns the weighing machine on or off
2. UNIT key changes the weight units, kg, g, lb, oz, lb:oz
3. ZERO key sets display to zero or subtract the container weight
4. PCS key for pieces counting function
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4.2 Program options
Besides performing accurate simple weighing, your versatile weighing machine can also perform pieces
counting.
4.2.1 Pieces counting
- Press ON/OFF key to turn on the scale
- Wait for "0" to appear on the display.
- If necessary, press ZERO key to set the display to “0”
- Press PCS key to enter PCS mode, the display will show P=X X
- Press UNIT key to select XX value (10, 20, 50, or 100)
- Place a given number of samples on the pan (Samples should be 10, 20, 50 or 100 pieces)
- Wait for stable indicator showed on display
- Press PCS key to confirm, display will show “PASS” and then the confirmed sample value.
- Start counting by adding more samples on the scale
- Press UNIT key to return to the weighing mode.
.
4.2.2 Selectable auto shut off
Press and hold PCS key, and then press ON/OFF key to turn on the scale, the display will show
A_ON or A_OFF. Press ZERO key to select A _ON (activate the auto shut off function) or
A_OFF(inactivate the auto shut off function). Turn off the scale to confirm and quit setting.
4.2.3 Selectable auto backlight
Press and hold PCS key, and then press ON/OFF key to turn on the scale, the display will show
A_ON or A_OFF. Press PCS key, the display will show L_ON, L_OFF or L_Au, press ZERO key to
select L_ON, L_OFF or L_AU (auto). Turn off the scale to confirm and quit setting.
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5 Calibration - Using an External Calibration Weight:
Calibration is required when the weighing machine is initially installed or if the scale is moved to a
substantial distance from the original location. 10 minutes warm up of scale is always needed before
calibration.
Turn the scale on and then turn it off
Press and hold ZERO key, and then press ON/OFF key to turn on the scale, the display will show
CAPu=
Press PCS key, display will show CAP. Press PCS key again, display will show CALu=, press
UNIT key to choose the calibration unit kg or lb
Press PCS key to confirm and display will show CALu= again
Press PCS key, display will show CAL, press UNIT key to set the calibration weight, display will
show xx.x with a flashing digit
Press UNIT key to move flashing digit to right, press ZERO key to increase the digit number. (We
suggest the calibration weight to be at least 50% or more within the scale capacity to get an
accurate weighing )
Press PCS to confirm the setting, display will show CAL
Press ZERO key to start calibration, the display will show the AD value, and wait for stable
indicator displayed, then press UNIT key, display will show ------, and then the flashing calibration
weight
Place the test weight onto the center of the weighing pan, and wait for stable indicator displayed,
press UNIT key, after stable indicator displayed again, it will show ------ and then the AD value,
and now the calibration is completed
Remove the test weight and press ON/OFF key to turn off the scale. Turn it on again to see if the
weighing is accurate, if not, repeat above steps .
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6 Maintenance and service
The weighing machine must be treated carefully and cleaned regularly. It is a precision instrument.
For maintenance-work, the balance must be separated from the power supply (remove power adapter
plug from socket). Also ensure that the balance cannot be reconnected to the power
supply during the work by a third party.
See Section 1.3 above regarding IP65. The scale may be washed down.
Never use solvents, acids, alkalis, paint thinners, scouring powders or other aggressive or corrosive
chemicals for cleaning, since these substances attack the surfaces of the scale housing and
can cause damage.
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7 Transport, storage
7.1 Transportation and shipping of the weighing machine
Your weighing machine is a precision instrument. Treat it carefully. Avoid shaking, severe impacts and
vibration during the transportation.
Take care that there are no marked temperature fluctuations during the transportation and that the
weighing machine does not become damp (condensation).
7.2 Storage of the weighing machine
If you would like to take the weighing machine out of service for an extended period, disconnect it from
the electricity supply, clean it thoroughly (see Section 6 .Maintenance and servicing.) and store it in a
place which meets the following conditions:
No violent shaking, no vibrations
Minimum temperature fluctuations
No direct solar radiation
Minimum moisture
The weighing machine should preferably be dispatched and transported in the original packaging to avoid
transportation damage.
The weighing machine should preferably be stored in the original packaging, since this provides optimal
protection for the weighing machine.
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