Tree MRW series User manual

Professional Weighing Equipment
MRW SERIES intelligent weighing scale
WASHDOWN WEIGHING SCALE - Dust and Waterproof Scale IP65
WITH PIECE COUNTING FUNCTION
Operation Manual

MRW Operation Manual
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Table of Contents
Section Page
Declaration of Conformity 3
Customer Service 4
Introduction 5
Safety 6
IP65 Protection 7
Weight Scale 8
Functions 9-10
Features 10-11
Application & Conformity 12
Getting Started 13
Delivery 13
Assembly & Installation 14
Application Menu 15
Program Options 15
Calibration 16
Maintenance & Service 17
Transport & Storage 17
Warranty 18

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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
Mark applied
EU Directive
Standards
2004/108/EC
EN 61326-1: 2006
Signature:
Boon Lim, R & D Manager
Date: 14. 11. 2012
LW Measurements LLC, 3510 Industrial Drive, Unit H Santa Rosa, CA 95403
Imperial version
Metric version
MRW-3
MRW-1500
MRW-7
MRW-3000
MRW-15
MRW-7500
MRW-33
MRW-15k

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Customer Service
USA
LW Measurements LLC, 3510 Industrial Drive,
Unit H Santa Rosa, CA 95403
USA
Tel: [phone]
FAX: [phone]
http://lwmeasurements.com
EUROPE
LW Measurements Europe Ltd
Chalkwell Park House 700 London Road
Westcliff-on-Sea Essex SS0 9HQ
United Kingdom
Tel: [phone]
Fax: [phone]
http://lwmeasurements.com

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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 scale 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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Safety
Representations and symbols
Important instructions, which involve safety, are highlighted with the appropriate mark:
Safety recommendations
When using the weighing equipment in surroundings with increased safety
requirements, the corresponding regulations must be observed.
The weighing scale may only be used with the power adapter supplied.
Before connecting the power adapter to the scale, the user must ensure that the
operating voltage stated on the power adapter is compliant 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 scale must immediately be
disconnected from the electricity supply (pull out the power adapter).
If the power adapter or its cable is damaged, the weighing scale must immediately be
disconnected from the electricity supply (pull out the power adapter).
If there should be any reason to believe that it is no longer safe to operate the scale, it
should 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 set out
in maintenance and servicing.
The weighing scale must not be operated in an area subject to explosion risks.
Care must be taken when weighing liquids to ensure that no liquid is spilled into the
inside of the scale or into connections on the rear of the equipment or the power
adapter. If liquid is spilled on the scale, it must immediately be unplugged from the main
electricity supply (pull out power adapter).
The weighing scale may be operated after it has first been inspected by a service
technician.
These operating instructions must be read by each user and should be easily
accessible at the workplace at all times

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IP65 protection
Your MRW weighing scale 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)
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

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Weight Scale
Construction & Functions
The weighing scale consists of the following parts;
The scale body (1)
The scale-pan (2)
The adapter (3)
Operation Manual.
Figure 2.1 Your weighing machine
2
3
2
1

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Functions
The MRW Series are high-quality electronic precision weighing scales designed to
function as counting scales and check-weights with the following specifications
Imperial weight unit version
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

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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
scales 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

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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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Application & Conformity
The Following are instructions of how to correctly use the weight scale:
The weighing scale may only be used for the weighing of solid-materials and of liquids
filled into secure containers.
The maximum capacity load of the weighing scale must never be exceeded, otherwise
the weighing scale may be damaged.
In using the weighing scale in combination with other devices as well as with devices
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.
The weighing scale has been manufactured and tested in accordance with the
standards and recommendations set out in the declaration of conformity.
The power adapter supplied for the weighing scale complies with the appropriate
electrical protection class.
The following applies to all MRW series weighing scales
Power supply:
Input: 110V or 230V AC (+/-15-20%); 50Hz 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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Getting Started
The scale is packaged in an environmentally-friendly carton, which provides optimum
protection for the balance during transportation.
We suggest that you keep the original packaging in order to avoid damage if you are
shipping or transporting the scale to a different location. It is also the best way to keep it
in the best conditions if it will not be used for an extended period of time.
In order to avoid damage, please follow the instructions provided below, when
unpacking the scale:
Unpack the scale carefully.
When outside temperatures are very low, the scale should be stored for a couple
hours and kept in its box in a dry room at normal temperature, so that no
condensation settles on the unit when opening the box.
Check the scale immediately after unpacking for any external visual damage. If
there is any damage on scale, contact customer service immediately.
If the scale is not to be used immediately after purchase, it should be stored in a
dry place where fluctuations in temperature are low. (Reference pg.).
Read through these operating instruction, before you work with the unit and pay
attention to the Safety recommendations (reference Safety)
Delivery
Inspect delivery for completeness immediately on unpacking all components.
Checklist for complete delivery
Component delivered present yes / no
Weighing unit body
Weighing pan
Power adapter
Operating manual

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Assembly & Installation
The weighing scale is delivered in a partly dismantled condition. Assemble the individual
components in the following sequence:
Place your machine on a level, clean, and dry surface to obtain accurate
readings.
Place the plastic platter on top of the scale, flat side facing up so the platter
sits firmly on the machine with the four “legs” inserted into the corresponding
four receptacles.
Place the stainless steel platter on top of the plastic platter with the flat side
facing up.
Unwrap and place the clear plastic bowl, open side facing up, on top of the
stainless platter.
Connecting the AC Adapter
The following Safety recommendations must be observed when connecting the balance:
The Scale should only be connected to the mains voltage socket with the power adapter
supplied. Check before connecting the power adapter to the mains socket, that the
operating voltage stated on the power adapter complies with the local mains voltage.
If the operating voltage is not the same as the mains voltage, the power adapter must
not be connected to the mains socket and contact customer service.
Placement of Scale
The location in which the scale is placed is very important in order for the scale to work
to its full potential. Certain conditions can affect the capabilities of the scale, conditions
like: the presence of air flow, variations in temperature, and direct sunlight. Please
follow the recommendations given below in choosing a location to place your scale.
Place the scale 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
Avoid placing the scale near or on any magnetic surfaces

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Application Menu
Display messages & Key functions
Display messages
The STABLE icon indicates when the readings stabled.
The ZERO icon indicates when the weights tared to zero.
The LO-BAT icon indicates when running out of battery.
Key functions
ON/OFF key turns the weighing scale on or off
UNIT key changes the weight units, kg, g, lb., oz, lb:oz
ZERO key sets display to zero or subtract the container weight
PCS key for pieces counting function
Program Options
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”).
Take the item sample you will be counting and place them on the platform.
Press the “PCS” key and enter the number of units you place on the platform.
Press “Unit” key to select XX value (10, 20, 50, or 100).
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.

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Auto shut off setting
Press and hold the “PCS”key, and then press the “On/Off” key to turn on the scale, the display will
show A_ON or A_OFF. Press the “Zero” key to select A _ON (this will activate the auto shut off
function) or A_OFF (this will deactivate the auto shut off function). Turn off the scale to confirm the
function.
Auto backlight setting
Press and hold the “PCS” key, and then press the “On/Off” key to turn on the scale, the display will
show A_ON or A_OFF. Press the “PCS”key, and the display will show L_ON, L_OFF or L_Au, press
the “Zero” key to select L_ON, L_OFF or L_AU (auto). Turn off the scale to confirm the function.
Calibration
Using an External Calibration Weight:
Calibration is required when the weighing scale is initially installed or if the scale is
moved to a substantial distance from the original location.
Turn the scale on and let it warm up for about 10 minute and then turn it off.
Press and hold the “Zero” key, and the “On/Off” key to turn on the scale and
bring up the calibration menu, the display will show “CAPu=”.
Select a unit of measure (kg. or lb.) by pressing the “Unit” key and then confirm
by pressing the “PCS” key. Press the “PCS” key again to move on to the next
menu
Press the “PCS”key, the 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 the “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 the steps above.

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Maintenance and service
The weighing scale is a precision instrument and must be treated carefully and cleaned
regularly.
For maintenance-work, the balance must be disconnected from the power supply
(remove power adapter plug from socket). Also, ensure that the balance cannot be
connected 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, these substances cause damage to the surfaces of
the scale housing.
Transport & Storage
Your weighing machine is a precision instrument, treat it carefully. Avoid shaking,
severe impacts and vibration during the transportation. Make sure that there are no
marked temperature fluctuations during the transportation and that the weighing
machine does not become damp (condensation).
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 (refer to Maintenance &
Service) 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

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Warranty
The products are under warranty against factory defects for a period of two (2) years
from the date of shipment.
For Customers within the lower 48 states of the continental United States. LW
Measurements will pay for fright both ways for the first 30 days after purchase. After 30
days expire the customer is responsible for shipping the product back to us. After the
product is received we will inspect it and as necessary we will repair or replace and will
ship the product back to the customer at our expense.
Any new scales returned for warranty must be properly packaged in the original box. If
they are not properly packed an in the original box, the customer pays for shipping cost.
If we determine there is a factory defect, we will pay for the shipping back. If we
determine that it is not a factory defect, the customer will pay shipping.
For Customers outside the lower 48 States, including Mexico, Canada, Puerto Rico,
Hawaii, Alaska and all other countries, customers must pay for shipping.
Our warranty does not cover misuse or neglect including but not limited to battery or
water damage, overloading, and chewed or cut wires. If the product is found to have
been misused or damaged by the customer, LW measurements is not responsible for
the cost of return.
For warranty claims please go online to lwmeasurements.com and fill out the warranty
submission form or call your customer service representative.