Mettler Toledo PL-L Operating Instructions Manual
Operating Instructions
METTLER TOLEDO
PL-L Line of Classic Light Balances
www.mt.com/classic
Operating instructions in a nutshell
Press key briefly
Press and hold key down until the desired display appears
automatic sequence
▼
Switching on
On
88888888
▼
0.00 g
Switching off
Off
OFF
▼
Simple weighing
0.00 g
• 1182.03 g
1250.00 g
Adjusting (calibration) external
Cal
CAL
▼
Cal
2000.00
Cal
------
▼
Cal
0.00
Cal
------
▼
Cal
CAL donE
▼
0.00 g
Recall weight / Recall weight
value*
0.00 g
26.72 g
0.00 g
F
*
26.72 g
#
0.00 g
Piece counting*
#
0.00 g
12.07 g
SEt 10
F
SEt 20
“
20
±
PCS
PCS
PCS
Percent weighing*
0.00 g
12.07 g
SEt100
F
100.00
±
101.60
Taring
0.00 g
#
0.00 g
95.97 g
-121.01 g
Unit switching*
22.00 g
±
0.78
%
%
%
121.01 g
oz
“
244
147.25 g
PCS
* These functions must be activated
in the menu (section 4.3.2)
Contents
Contents
3
1 Getting to know PL-L balances line ..............4
1.1 General .............................................................. 4
1.2 Layout of balances ............................................... 4
1.3 Overview of key functions ...................................... 5
2 Startup ......................................................6
2.1 Unpacking / standard equipment ............................ 6
2.2 Cautionary notes ................................................. 6
2.3 Setting up, leveling, preparations for weighing below
the balance ......................................................... 6
2.4 Adjusting (calibration) .......................................... 8
3 Weighing ...................................................9
3.1 On/Off switching ................................................... 9
3.2 Simple weighing .................................................. 9
3.3 Faster weighing with reduced readability ................. 9
3.4 Taring ................................................................. 9
4 Menu .......................................................10
4.1 Overview ........................................................... 10
4.2 Menu operation .................................................. 11
4.3 Description of menu options ................................ 11
5 Functions .................................................15
5.1 Recall weight / Recall weight value ....................... 15
5.2 Piece counting ................................................... 16
5.3 Percent weighing ................................................ 17
5.4 Switching weight units ........................................ 17
6 Technical data, options,
optional equipment ..................................18
6.1 Technical data ................................................... 18
6.2 RS232C interface ............................................... 20
6.3 MT-SICS Interface commands and functions .......... 20
6.4 Optional equipment ............................................ 22
6.5 Dimensional drawing (in mm) ............................. 23
7 Appendix .................................................24
7.1 Typical printouts from METTLER TOLEDO
RS-P26 and LC-P45 printers ............................... 24
7.2 What if ...? ........................................................ 25
7.3 Maintenance and cleaning .................................. 26
7.4 Declaration of conformity .................................... 27
Getting to know PL-L balances line
4
1 Getting to know PL-L balances line
1.1 General
1.2 Layout of balances
4
5
3
2
11
1
11
6
10
9
4
5
6
7
6
12
8
Balance features
• The PL-L balance line comprises portable balances with a readability of 0.01 g
to 1 g. The weighing ranges extend from 210 g to 6.1 kg.
• In addition to basic operations such as weighing, taring and adjusting (calibra-
tion) miscellaneous functions such as “Recall weight”,“Piece counting weigh-
ing” or “Percent weighing” can be activated.
1 Keys
2 Display
3 Model plate with the following data:
“Max”: maximum capacity
“d”: readability
“Min”: minimum capacity (recommended minimum load, only relevant for
certified balances)
“e”: verification scale interval (smallest display increment tested during
certification, only relevant for certified balances)
4 Weighing pan
5 Draft shield element (not all models)
6 Leveling feet (not all models)
7 Hanger opening for weighing below the balance (underside of balance)
8 AC adapter socket
9 RS232C interface (optional)
10 Lug for optional antitheft device
11 Leveling control (not all models)
12 Compartment for batteries
Getting to know PL-L balancees line
1.3 Overview of key functions
The balances have two operator control levels: the weighing mode and the menu. The function of each individual key depends
on the operator control level and how long the key is pressed.
Key functions in weighing mode
5
Weighing mode
Menu
0.00
▼
ŸÖENV
Press briefly Press and hold down
1/10d • Reduce readability Cal • Adjust (calibrate)
On • Switch on Off • Switch off
g
# • Zero/tare
C • Cancel function
“ • Switch F • Call function;
• Change settings A function must be
activated in the menu,
otherwise “F nonE”
appears in the display
± • Transfer weighing data via Menu • Show menu (hold key
interface with activated down until MENU
printer appears)
• Confirm settings
Key functions in menu mode
Press briefly Press and hold down
1/10d • Change settings 1/10d • Reduce value
• Reduce value by 1 step rapidly
C • Close menu (without –
saving changes)
“ • Change settings “ • Increase value rapidly
• Increase value by 1 step
± • Select next menu item Menu • Save changes and close
menu
a)
b)
Startup
6
2 Startup
2.1 Unpacking / standard equipment
1)
2.2 Cautionary notes
The standard equipment for every balance comprises:
• AC adapter, to national standard
• Weighing pan, Weighing pan support, draft shield element (depending on
model)
• Operating Instructions
• Protective cover (placed on the balance over the weighing cell cone) with instruction sheet. This protective cover must not mislaid. It will be needed again
later to protect the cone when changing batteries (underside of balance).
1) In-use covers are available as optional extras (Section 6.4). In the case of
models having the large weighing pan (ø 160 mm) the antistatic plate a)
(secured by two screws) and the adapter ring b) must also be removed in order
to fit the in-use cover.
• PL-L balances must not be operated in hazardous areas with the standardsupply AC adapter.
• Before connecting the AC adapter, verify that the voltage printed on it corresponds
to the local AC power supply voltage. If this is not the case, please contact your
local METTLER TOLEDO dealer.
• PL-L balances may only be used indoors in a dry environment.
• For use with CSA Certified (or equivalent approved) power source, which must
have a limited and SELV circuit output.
2.3 Setting up, leveling, preparations for weighing below the balance
The optimum location
The correct location makes an important contribution to the accuracy of the weighing
results of high-resolution analytical and precision balances.
• Stable, vibration-free position as horizontal as possible
• No direct sunlight
• No excessive temperature fluctuations
• No drafts
The best location is on a stable bench in a corner protected against drafts, as far
away as possible from doors, windows, radiators or the louvers of air conditioners.
Leveling
Some models are equipped with a level glass and two or four leveling feet to compensate for minor irregularities in the surface on which the balance stands. The balance
is exactly horizontal when the air bubble is in the middle of the level glass.
Note: The balance should be leveled each time it is moved to a new location.
Preparations for weighing below the balance
To carry out weighing operations below the balance, get rid of the special cover on
the underside of the balance. (Note: never put the balance without the protective
cover over its cone down on its head, only on its side!). This exposes the opening
for the hanger, making weighing below the balance possible.
Startup
Antitheft device
All models are provided with a lug for attaching an antitheft device (see optional
equipment in Section 6.4).
Power supply
➞ Plug the AC adapter into the AC adapter socket on the balance, and connect to
the power supply.
➞ The balance performs a self-test. This test is finished when “OFF” appears.
➞ Press the «On» key briefly: the balance is in operational readiness. Before any
work is performed with the balance, it must be adjusted (Section 2.4).
Battery operation
Models in the PL-L line of balances can also be operated independently of the AC
power supply by using their batteries. To do this, always fit the protective cover
over the weighing cell cone first, then open the cover of the battery compartment
on the underside of the balance and insert the batteries.
Caution: ensure correct polarity (as specified inside the battery compartment).
Close battery compartment again.
When the balance is operating on its batteries, the border around the battery symbol
in the display lights up. The number of segments that are lit is an indicator of battery condition (3 = fully charged, 0 = discharged). When the batteries are almost
completely discharged, the last segment flashes.
Recommended battery type: AA (LR6) 1.5 V alkali-manganese.
NiMH (nickel-metal hydride) rechargeable batteries, which are recharged in an
external battery charger, can be also be used. The intervals between recharging are
not as long as the service life of a nonrechargeable battery.
Notes
• Batteries are not included in the standard supply.
• Battery operation is automatically overridden when the AC adapter is connected
to the AC power supply.
• To prolong battery (disposable or rechargeable) life, it is advisable to activate
«Auto shut» in the menu (see Section 4.3.7).
• All discharged batteries must be disposed of in an environmentally responsible
manner. No attempt must be made to incinerate or disassemble them.
7
Startup
8
2.4 Adjusting (calibration)
Cal
CAL
▼
Cal
2000.00
Cal
------
▼
Cal
0.00
Cal
------
▼
Cal
CAL donE
▼
0.00 g
To obtain accurate weighing results, the balance must be adjusted to match the
gravitational acceleration at its location.
Adjusting is necessary
• before the balance is used for the first time
• at regular intervals during weighing service
• after a change of location
To obtain accurate results, the balance must be left switched on for 30 minutes to
reach operating temperature before starting the adjustment procedure.
Adjusting with external weight
➞ Have required adjusting weight ready.
➞ Unload weighing pan.
➞ Press and hold the «Cal» key down until “CAL” appears in the display. Release
key.
The required adjustment weight value flashes in the display.
➞ Place adjustment weight in centre of pan. The balance adjusts itself auto-mati-
cally.
➞ When “0.00 g” flashes, remove adjustment weight.
The adjusting is finished when the message “CAL done” appears briefly in the
display, followed by “0.00 g”. The balance is again in weighing mode and ready
for operation.
Notes
• Certified PL-L models cannot be adjusted by the user, because of weights and
measures legislation.
• This adjustment procedure can be terminated at any time with the «C» (“Cancel”)
key. The balance reverts to weighing mode.
3 Weighing
3.1 On/Off switching
On
0.00 g
88888888
▼
Weighing
9
Switching on
➞ Remove any load from weighing pan and press «On» key briefly.
The balance performs a display test (all segments in the display light up
briefly).
When zero is displayed, the balance is ready for operation.
Off
3.2 Simple weighing
3.3 Faster weighing with reduced readability
The balance has the facility for speeding up the weighing operation by reducing its readablity (number of decimal places):
1/10d
3.4 Taring
#
OFF
▼
0.00 g
• 1182.03 g
1250.00 g
1.24 g
1.2 g
0.00 g
121.01 g
0.00 g
Switching off
➞ Press and hold the «Off» key down until “OFF” appears in the display. Release
the key.
➞ Place weighing sample on the weighing pan.
➞ Wait until the stability detector “•” disappears.
➞ Read the result.
➞ The balance is operating with its normal readability and speed.
➞ Press the «1/10d» key and …
➞ … the balance operates with reduced readability (one decimal place less), but
displays the weighing result quicker. Pressing the «1/10d» key briefly again
toggles the balance back to its full readability.
➞ Place empty container on the balance.
➞ The weight is displayed.
➞ Press the «#» key briefly.
95.97 g
-121.01 g
➞ Add weighing sample to container. The net weight is now displayed.
If the container is removed from the balance, the tare weight will be shown as a
negative value.
The tare weight remains stored until the «#» key is pressed again or the
balance is switched off.
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