User Manual
Portable Balances
PL-E
u www.mt.com/pl-e-OI
u www.mt.com/library
Portable Balances
3
Overview components
4
5
3
2
1
6
7
8
7
11
10
9
Components overview legend
1
Operation keys
2
Display
3
Adapter ring
4
Weighing pan
5
Level indicator
6
Bottom of balance:
•
•
4
Battery compartment
Hanger opening for weighing below the
balance
7
Leveling feet
8
Model sticker
9
Socket for AC/DC Adapter
10
RS232C serial interface
11
Lug for optional antitheft device
Portable Balances
Overview operation keys
1
2
3
4
5
Terminal keys legend
No.
1
Key
Press briefly (less than 1.5 s)
•
•
•
•
2
•
Press and hold (longer than 1.5 s)
Printout display value
Transmit data
To navigate backward in the menu or
menu selection
Decrease parameters in menu or applications
•
Zero setting
•
•
•
Cancel and leave menu without saving
One step back in the menu
Cancel or leave application setting
•
Switch off
•
3
•
•
4
•
•
•
•
5
•
•
•
Portable Balances
Tare
Switch on
Open the application list and scroll
among the weighing applications in
certain sequence for selecting an application
Exits an active application and returns
to the selection for weighing mode
With entries, scroll down
•
To navigate forward menu topics or
menu selections
To toggle between unit 1, recall value (if
selected), unit 2 (if different from unit 1)
and the application unit (if any)
Increase parameters in menu or applications
Execute predefined adjustment
(calibration) procedure
Enter or leave menu selection
To enter application parameter and
switch to next parameter
To store parameter
Enter or leave menu (parameter
settings)
•
5
1 Safety Information
Two documents named "User Manual" and "Operating Instructions" are available for this instrument.
The User Manual shows you how to start using the instrument.
The Operating Instructions contain a full description of the instrument and its use.
• Keep both documents for future reference.
• Include both documents if you transfer the instrument to other parties.
Only use the instrument according to the User Manual and the Operating Instructions. If you do not use the
instrument according to these documents or if the instrument is modified, the safety of the instrument may
be impaired and Mettler-Toledo GmbH assumes no liability.
•
•
Additional information about this balance can be found in the Operating Instructions on the CDROM or online.
u www.mt.com/pl-e-OI
1.1 Definitions of signal words and warning symbols
Safety notes contain important information on safety issues. Ignoring the safety notes may lead to personal
injury, damage to the instrument, malfunctions and false results. Safety notes are marked with the following
signal words and warning symbols:
Signal words
WARNING
A hazardous situation with medium risk, possibly resulting in death or severe injury if
not avoided.
CAUTION
A hazardous situation with low risk, resulting in minor or moderate injury if not
avoided.
NOTICE
A hazardous situation with low risk, resulting in damage to the instrument, other
material damage, malfunctions and erroneous results, or loss of data.
Warning symbols
Electrical shock
General hazard: read the Operating Instructions for information about the hazards and the
resulting measures.
1.2 Product specific safety notes
Intended use
This instrument is designed to be used in laboratories by trained staff. The instrument is intended for
weighing purposes.
Any other type of use and operation beyond the limits of technical specifications without written consent from
Mettler-Toledo GmbH is considered as not intended.
Responsibilities of the instrument owner
The instrument owner is the person holding the legal title to the instrument and who uses the instrument or
authorizes any person to use it, or the person who is deemed by law to be the operator of the instrument.
The instrument owner is responsible for the safety of all users of the instrument and third parties.
METTLER TOLEDO assumes that the instrument owner trains users to safely use the instrument in their
workplace and deal with potential hazards. METTLER TOLEDO assumes that the instrument owner provides
the necessary protective gear.
6
Portable Balances
Safety notes
WARNING
Danger of death or serious injury due to electric shock!
Contact with parts that carry a live current can lead to death or injury.
1 Only use the METTLER TOLEDO power supply cable and AC/DC adapter designed for your
instrument.
2 Connect the power cable to a grounded power outlet.
3 Keep all electrical cables and connections away from liquids and moisture.
4 Check the cables and power plug for damage and replace damaged cables and power
plugs.
NOTICE
Risk of damage to the instrument due to the use of unsuitable parts!
Using unsuitable parts with the instrument can damage the Instrument or cause it to
malfunction.
− Only use parts from METTLER TOLEDO that are intended to be used with your instrument.
2 Design and Function
2.1 Display
Application Icons
Weighing-in aid
Status Icons
Weight Value Field
Unit Field
Application icons
Application weighing
Application totaling
Application piece counting
Application dynamic weighing
Application percent weighing
Application multiplication factor
Application check weighing
Application division factor
Application statistics
Application density
Application formulation / Net total
Menu locked
While an application is running, the corresponding application icon appears at the top of the display.
Status icons
Indicates stored value (Memory)
Feedback for pressed keys
Indicates net weight values
Service reminder
Adjustments (calibration) started
Portable Balances
7
Weight value field and weighing-in aid
Brackets to indicate uncertified digits
(approved models only)
SmartTrack (weighing-in aid)
shows how much of the entire weighing
range has been used.
Indicates negative values
Marking of nominal or target weight
Indicates unstable values
Marking of tolerance limit T+
Indicates calculated values
Marking of tolerance limit T-
Unit field
g
gram
ozt
troy ounce
tls
Singapore taels
kg
kilogram
GN
grain
tlt
Taiwan taels
mg
milligram
dwt
pennyweight
ct
carat
mom momme
lb
pound
msg
oz
ounce
tlh
tola
tola
baht
baht
mesghal
Hong Kong taels
3 Installation and Putting into Operation
Finding more information
Additional information about this balance can be found in the Operating Instructions on the CDROM or online.
u www.mt.com/pl-e-OI
Search for documents.
u www.mt.com/library
WARNING
Danger of death or serious injury due to electric shock!
The instrument must be disconnected from the power supply before performing all setup and
assembly work.
3.1 Unpacking and delivery inspection
NOTICE
Risk of damage to the instrument due to the use of unsuitable parts!
Using unsuitable parts with the instrument can damage the Instrument or cause it to
malfunction.
− Only use parts from METTLER TOLEDO that are intended to be used with your instrument.
1 Open the packaging and carefully remove all components.
2 Check the delivered items.
The standard scope of delivery contains the following items
•
•
•
8
Balance
Weighing pan and weighing pan support
Protective cover for load cell cone (mounted)
Portable Balances
•
•
•
•
•
Protective cover (mounted)
Stackable cover
Universal AC/DC adapter (country specific)
Operating Instructions or User Manual; printed or on CD-ROM, depending on country of use
Declaration of conformity
3.2 Selecting the location
A good location will enable the balance to work accurately and reliably. The surface must be able to safely
take the weight of the balance when fully loaded. The following local conditions must be observed:
If the balance is not horizontal at the outset, it must be leveled during commissioning.
•
•
•
•
•
•
•
•
•
Operate the balance in indoor environments only and at an altitude of less than 4000 m above sea
level.
Before switching on the balance, leave the parts to reach room temperature (+5 to 40°C).
Ensure that the relative humidity is between 10% and 80% and non-condensing conditions are met.
The power plug must be easily accessible.
No powerful vibrations
No direct sunlight
No excessive temperature fluctuations.
No powerful drafts.
No powerful electric or magnetic fields
Ensure that the surroundings as free from dust as
possible.
3.3 Installing the components
1 Remove the protective cover for weighing cone (1).
Keep it for later use.
2 Place the following components on the balance in the
specified order:
• Pan support (2)
• Weighing pan (3)
3
2
1
Portable Balances
9
3.4 Installation of the protective cover
− Install the protective cover according to the illustration
on, using a screwdriver.
3.5 Connecting the balance
WARNING
Danger of death or serious injury due to electric shock!
Contact with parts that carry a live current can lead to death or injury.
1 Only use the METTLER TOLEDO power supply cable and AC/DC adapter designed for your
instrument.
2 Connect the power cable to a grounded power outlet.
3 Keep all electrical cables and connections away from liquids and moisture.
4 Check the cables and power plug for damage and replace damaged cables and power
plugs.
NOTICE
Danger of damage to the AC/DC adapter due to overheating!
If the AC/DC adapter is covered or in a container, it is not sufficiently cooled and will overheat.
1 Do not cover the AC/DC adapter.
2 Do not put the AC/DC adapter in a container.
The balance is supplied with an universal AC/DC adapter.
•
•
10
Install the cables so that they cannot be damaged or interfere with operation.
Insert the power cable in a grounded power outlet that is easily accessible.
Portable Balances
− Connect the AC/DC adapter to the connection socket
on the back of your balance (see figure) and to the
power line.
ð The balance is ready for use.
3.5.1 Battery operation
The balance can also operate with batteries. Under normal operation conditions, the balance works independently of the AC power line for about 8 to 15 hours (using alkaline batteries).
It is also possible to use rechargeable batteries. Charging batteries inside the balance is not possible.
Your balance uses 4 standard AA (LR6) batteries (alkaline batteries preferred).
Inserting / replacing batteries
WARNING
Danger of death or serious injury due to electric shock!
Contact with parts that contain a live current can lead to injury and death.
− Disconnect the instrument from the power supply when replacing batteries.
NOTICE
Risk of damage to the balance
Do not place the balance on the pan support location bolt.
•
•
•
•
Read and follow all warnings and instructions supplied by the battery manufacturer.
Do not mix different types or brands of batteries. Performance of batteries varies depending on the
manufacturer.
Remove the batteries from the balance if the balance is not used for a long period of time.
Batteries must be disposed of properly, according to local regulations.
§ Make sure that the balance is off before removing or inserting batteries.
1 Remove weighing pan and pan support.
2 Turn the balance carefully on its side.
Portable Balances
11
3 Open and remove the battery-chamber cover.
4 Insert / replace the batteries with the correct polarity as
shown in the battery holder.
5 Insert and close the battery-chamber cover.
6 Turn the balance carefully to its normal position.
7 Reinstall all components in the reverse order.
+
-
+
+
-
-
-
+
3.6 Setting up the balance
3.6.1 Switching on the balance
Before using the balance, it must be warmed up in order to obtain accurate weighing results. To reach
operating temperature, the balance must be acclimatized and connected to the power supply for at least 30
minutes.
Mains operated (standby mode)
§ The balance is connected to the power supply.
− Press .
ð The balance performs a display test. All segments
in the display light up briefly, WELCOME, Software
version. Maximum load and Readability appears
briefly.
ð The balance is ready for weighing or for operation with
the last active application.
MT.GREEN
0.00
g
Battery operated
1 Remove any load from weighing pan.
2 Press .
ð The balance performs a display test (all segments in the display light up briefly), WELCOME,
Software version, Maximum load and Readability appears briefly.
ð After the warm-up time, the balance is ready for weighing or for operation with the last active application.
Legal-for-trade
Approved balances will execute an initial zero.
3.6.2 Leveling the balance
The balances have a level indicator and two or four adjustable leveling feet to compensate for slight irregularities in the surface of the weighing bench. The balance is exactly horizontal when the air bubble is in the
middle of the level glass.
The balance must be leveled and adjusted each time it is moved to a new location.
12
Portable Balances
1 Align the balance horizontally.
2 Turning the leveling feet of the balance housing until
the air bubble is in the inner circle of the level
indicator.
3.6.3 Adjusting the balance
To obtain accurate weighing results, the balance must be adjusted to match the gravitational acceleration at
its location and depending on the ambient conditions. After reaching the operation temperature, adjusting is
necessary.
•
•
•
before the balance is used for the first time.
after a change of the location.
at regular intervals during weighing service.
See also
2
Adjustment with external weight } Page 13
3.7 Adjustment with external weight
Legal-for-trade
Approved models must be adjusted at the place of operation. Before putting in operation, and depending on
particular country certification legislation, the balance will then have to be checked and sealed by authorized
personnel. See the detailed information delivered with this balance.
§ In the menu topic CAL (Adjustment) of advanced menu ADJ.EXT must be selected.
§ Required adjustment weight is ready.
§ Weighing pan is unloaded.
1 Press and hold CAL to execute external adjustment.
ð The required (predefined) adjustment weight value
flashes on the display.
2 Place adjustment weight in center of pan.
ð The balance adjusts itself automatically.
3 Remove adjustment weight, when 0.00 g flashes.
ð The adjusting is finished when the message ADJ
DONE appears briefly on the display. The balance
returns to the last active application and is ready for
operation.
Cal
ADJ.EXT
2000.00
g
-----0.00
g
------
ADJ.DONE
0.00
Portable Balances
g
13
3.8 Performing a simple weighing
The weighing application allows you to perform simple weighings and how you can
accelerate the weighing process.
If your balance is not in the weighing mode, press and hold the
display. Press
. Your balance is in the weighing mode.
key down until WEIGH appears in the
1 Press
to zero the balance.
2 Place the sample on the weighing pan.
3 Wait until the instability detector disappears and the
stability beep sounds.
4 Read the result.
0.00
g
0.00
g
1182.03
g
1250.38
g
121.01
g
0.01
g
0.00
g
Zeroing
Use the
zeroing key before you start with a weighing.
1 Unload the balance.
2 Press
to zero the balance.
ð All weight values are measured in relation to this
zero point.
Taring
If you are working with a weighing container, first set the balance to zero.
14
Portable Balances
1 Place empty container on the weighing pan.
ð The weight is displayed.
2 Press
to tare the balance.
ð 0.00 g and Net appears in the display. Net
indicates that all weight values displayed are net
values.
3 Place the sample in the container.
ð The result appears in the display.
If the container is removed from the balance, the tare
weight will be shown as a negative value.
0.00
g
121.01
g
0.00
Net
95.97
Net
- 121 .01
Net
g
g
g
Switching weight units
The
key can be used at any time to toggle between weight unit UNIT 1, RECALL value (if selected) and
weight unit UNIT 2 (if different from weight unit 1) and the application unit (if any).
− Press
to set weight unit or recall value.
22. 00
*
22. 00
0.78
g
M
g
oz
Recall / recall weight value
Recall stores stable weights with an absolute display value bigger than 10d.
Portable Balances
15
§ Function RECALL is in the menu activated.
1 Load weighing sample.
ð The display shows weight value and stores stable
value.
2 Remove weighing sample.
ð The display shows zero.
3 Press
.
ð The display shows last stored stable weight value
for 5 seconds together with asterisk (*) and
memory (M) symbols. After 5 seconds the display
goes back to zero. This can be repeated unlimited
times.
0.00
g
121.01
g
0.00
g
121.01
0.00
M
g
g
Delete last weight value
As soon a new stable weight value is displayed, the old recall value becomes replaced by the new weight
value.
− Press
.
ð The recall value is set to 0.
If the power is switched off, the recall value is lost. The recall value can not be printed.
Weighing with the weighing-in aid
The weighing-in aid is a dynamic graphic indicator which shows the used amount of the total weighing
range. You can thus recognize at a glance when the load on the balance approaches the maximum load.
100%
0%
Print / transmit data
Press the
key to transmit the weighing results over the interface e.g. to a printer or a PC.
4 Maintenance
4.1 Cleaning and service
Every now and then, clean the weighing pan, draft shield element, bottom plate, draft shield (depending on
the model) and housing of your balance. Your balance is made from high-quality, durable materials and
can therefore be cleaned using a damp cloth or with a standard, mild cleaning agent.
16
Portable Balances
Please observe the following notes
WARNING
Danger of death or serious injury due to electric shock!
Contact with parts carrying a live current can lead to injury and death.
1 Disconnect the balance from the power supply prior to cleaning and maintenance.
2 Only use METTLER TOLEDO power cables if they need to be replaced.
3 Prevent liquid from entering the balance, terminal or AC/DC adapter.
4 Do not open the balance, terminal or AC/DC adapter.
They do not contain any parts that can be serviced by the user.
NOTICE
Risk of damage to balance due to inappropriate cleaning methods
The balance is made from high quality, resistant materials and can be damaged by certain
cleaning agents, solvents or abrasives. Any liquid that enters the housing may damage the
balance.
1 Use water and a mild detergent to clean the balance or terminal.
2 Wipe off any spills immediately.
3 Prevent liquid from entering the interior of the balance.
Contact a METTLER TOLEDO representative to find about the service options available – regular maintenance
by an authorized service engineer will ensure consistent weighing accuracy over the long term and extend
the service life of the balance.
5 Technical Data
5.1 General data
WARNING
Danger of death or serious injury due to electric shock!
Contact with parts that contain a live current can lead to injury and death.
1 Only use an approved AC/DC adapter with a current-limited SELV output.
2 Ensure correct polarity
Standard power supply
AC/DC adapter:
Balance power supply:
Battery operation:
Primary: 100 – 240 V, ±10%, 50/60Hz, 0.3 A
Secondary: 12 V DC, 0.84 A (with electronic overload
protection)
12 V DC, 0.84 A
Can be used up to 2000 m above mean sea level.
4 standard AA (LR6) batteries (alkaline) for 8–15 hours of use
NOTICE
If the balance is used above 2000 m mean sea level, the optional power supply must be
used.
Optional power supply
AC/DC adapter:
Portable Balances
Primary: 100 – 240 V, ±10%, 50/60Hz
Secondary: 12 V DC ±3%, 2.5 A (with electronic overload
protection)
17
Cable for AC/DC adapter:
Balance power supply:
3-core, with country-specific plug
12 V DC ±3%, 2.25 A, maximum ripple: 80 mVpp
Can be used up to 4000 m above mean sea level.
Protection and standards
Overvoltage category:
Degree of pollution:
Protection:
Standards for safety and EMC:
Range of application:
II
2
Protected against dust and water
See Declaration of Conformity
For use in closed interior rooms only
Environmental conditions
Height above mean sea level:
Ambient temperature:
Relative air humidity:
Warm-up time:
Depending on the power adapter (2000 - 4000 m)
Except for China: max. 2000 m
Operating conditions for ordinary lab application: +10 to 30°C
(operability guaranteed between +5 and 40°C)
10% up to 80% at 31°C with a linear decrease to 50% at
40°C, non-condensing
At least 30 minutes (60 minutes for 0.1 mg models) after
connecting the balance to the power supply. When switched on
from standby, the instrument is ready for operation
immediately.
Materials
Housing:
Weighing pan:
18
Housing: Plastic (ABS/PC)
ø 160 mm: Stainless steel X5CrNi 18-10 (1.4301)
Portable Balances
www.mt.com/ple-precision
For more information
Mettler-Toledo GmbH
Im Langacher 44
8606 Greifensee, Switzerland
www.mt.com/contact
Subject to technical changes.
© Mettler-Toledo GmbH 11/2017
30357040E en
30357040
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