Sartorius MC 410 S, MC 210 S, MC 210 P, MC 21S, MC 5 Installation And Operating Instructions Manual
...
98648-004-81
Sartorius Micro
Analytical, Semi-micro- and Microbalances
Installation and Operating Instructions
0–0
Contents
Page
General Views of the Balances:
MC 210 S, MC 210 P and
MC 410 S (-0CE) 1– 0
General Views of the Balances
MC 5 (-0CE) and SC 2 (-0CE) 1– 2
Warranty 1– 4
Storage and Shipping Conditions 1– 4
Transporting the Balance 1– 5
Equipment Supplied 1– 7
Installation Instructions 1– 8
Using Verified Balances
Approved as Legal Measuring
Instruments in the EU 1– 9
Getting Started 1–10
General Instructions for
“Analytical Weighing” 1–16
Weighing Electrostatically
Charged Samples
and Containers 1–16
Weighing Magnetic
or Magnetizable Samples 1–17
General Instructions for Handling
Samples and Containers 1–18
Operating the Balance 1–19
Balance Display 1–19
Turning the Display On and Off 1–20
Self-Test 1–20
Opening and Closing the
Draft Shield 1–21
Simple Weighing 1–26
Taring 1–26
Weighing Range Structure 1–27
Weighing in the IQ-Mode 1–28
Mass Unit Conversion by Toggling
1–29
Displaying the Balance Model
and the Serial Number 1–29
Page
Calibration/Adjustment and
Linearization Functions 1–30
Data Interface 1–36
Below-Balance Weighing 1–37
Fastening an Antitheft
Locking Device 1–37
Troubleshooting Guide 1–38
Care and Maintenance 1–40
Servicing 1–40
Cleaning the Balance Housing 1–40
Cleaning the Weighing Chamber 1–40
Safety Precautions 1–41
Balance Operating Menu 2– 1
Weighing in Three Ranges
on Standard Balances 2– 7
Weighing in Two Ranges
on Verified Balances Approved
for Use as Legal
Measuring Instruments 2–10
Display Modes for
Standard Balances 2–11
Display Modes for Verified
Balances Approved for Use
As Legal Measuring Instruments 2–13
Calibration Functions on
Standard Balances 2–14
Calibration Functions on Verified
Balances Approved for Use
as Legal Measuring Instruments 2–16
Utilities for Printouts
or Data Transfer 2–18
Additional Functions 2–21
ISO/GLP-compliant Printout
or Record 2–25
Setting the ID No./Date/Time 2–30
0–1
Page
Application Programs 3– 1
Functions Common to
All Programs 3– 3
c Key 3– 3
Information and Printouts
or Data Transfer 3– 4
Data ID Code K* or NUM 3– 4
“EUREKA” Air Buoyancy
Correction Program 3– 5
Differential Weighing and
Backweighing 3–14
Weighing Sequence 3–15
Selecting the Memories 3–17
Key Functions 3–18
Clearing the Memory 3–31
Density 3–34
Diameter Determination 3–42
Tare Memory 3–44
Weighing in Percent 3–47
Over/Under Checkweighing 3–51
Counting 3–55
Error Codes 3–59
Page
Interface Description 4– 1
Pin Assignment Chart 4–19
Cabling Diagrams 4–20
Specifications 5– 1
English Translation of the
EC Type-Approval Certificate
for MC 5-0CE 5– 6
Accessories (Options) 5– 7
Declarations of Conformity 6– 1
Index 7– 1
Supplement:
Brief Operating Instructions
General View of the Balances:
MC 210 S, MC 210 P and MC 410 S (-0CE)
1–0
1–1
1 Large draft shield cover
2 Small draft shield cover
3 Exterior draft shield element,
semicylindrical
(can be moved by hand)
4 Interior draft shield door,
semicylindrical (can be moved by
motor control or by hand)
5 Interior weighing chamber
draft shield only on MC 210 S,
MC 210 P (-0CE)
6 Protective ring
7 Weighing pan
8 Protective disk
9 Leveling foot
10 Level indicator
11 Display unit
12 AC jack/power socket
13 Menu access switch
14 Data interface port
15 Terminal for connecting an
equipotential bonding conductor
16 Lug for attaching an antitheft
locking device
17 Metrological ID label for verified
balances approved for use as legal
measuring instruments
18 Manufacturer’s label
19 Application display
20 Numeric keys
21 f function key
22 F function key
23 r and l draft shield
function keys
24 p Print key (data transfer)
25 Function display for the
f and F keys
26 t Tare key
27 Application program display
28 Weight display
29 w toggle key
30 Info key
31 ON/OFF key e
32 c key
33 Bar graph (range indicator)
34 Verification ID label with
metrological data for verified
balances approved for use
as legal measuring instruments
General View of the Balances:
MC 5 (-0CE) and SC 2 (-0CE)
1–2
34
35
36
10
7
9
8
37
1–3
7 Weighing pan
8 Protective disk
9 Leveling foot
10 Level indicator
11 Display and control unit
12 AC jack
13 Menu access switch
14 Data interface port
15 Terminal for connecting an
equipotential bonding conductor
16 Lug for attaching an antitheft
locking device
17 Metrological ID label for verified
balances approved for use as legal
measuring instruments
18 Manufacturer’s label
(on bottom of balance)
19 Application display
20 Numeric keys
21 f function key
22 F function key
23 r and l draft shield function keys
(for opening and closing)
24 p Print key (data transfer)
25 Function display for
the f and F keys
26 t Tare key
27 Application program display
28 Weight display
29 w toggle key
30 Info key
31 ON/OFF key e
32 c key
33 Bar graph (range indicator)
34 Draft shield
35 Weighing cell
36 Inner draft shield
37 Below-balance weighing port
38 Male connector on weighing cell
39 Male connector on computing
device
40 Electronic computing device
Please read these installation and operating
instructions carefully before you begin to operate your
new balance.
Warranty
Do not miss out on the benefits of our full warranty.
Please contact your local Sartorius office or
dealer for further information. If available, complete
the warranty registration card, indicating the date
of installation, and return the card to your Sartorius
office or dealer.
Storage and Shipping Conditions
Allowable storage temperature: +5°C ... +40°C
+41°F to +104°F
The complete packaging has been designed to ensure
that the balance will not be damaged even if it is
dropped from a height of 80 cm (about 31 inches).
After unpacking the balance, please check
it immediately for any visible damage as a result
of rough handling during shipment.
If this is the case, proceed as directed in the section
entitled “Safety Inspection.”
Save all parts of the packaging and the box for
your balance to avoid damage during
transportation. Ship your balance only in the
complete original standard packaging supplied.
The packaging consists of the following:
– 2 boxes
– 3 polystyrene inserts
– 2 polypropylene pads
The inner packaging is not suitable for shipping
because it provides the balance little protection from
blows. Before packing your balance for shipment,
unplug all connected cables to prevent damage.
Do not expose the balance unnecessarily to extreme
temperatures, moisture, shocks, blows or vibrations.
1–4
Transporting the Balance
To transport the balance, lift it by the housing base
using both hands. Never lift your balance by grasping
the display unit or the draft shield!
Transport Arrestment
Before unplugging the balance from the power
supply or unplugging the connecting cable, turn off
the balance using the e key (31).
For MC5 (-0CE) and SC 2 (-0CE):
After approximately 10 seconds, the balance will
be arrested, or locked, for transportation.
While the balance is raising the weights after you
have turned it off, the symbol “Mot” from a calibration
or linearization procedure is displayed.
Warmup Time
Condition your balance for 12 hours to the temperature
of a new location. After initially connecting the
balance to AC power (or after a relatively long power
outage), allow it to warm up for at least 2 hours.
Each time you move your balance to another location,
you must condition it for at least 12 hours to the
new location.
After initially connecting the balance to AC power
(or after a relatively long power outage), allow the
balance to warm up for at least 2 hours.
1–5
Note to Users of Verified Balances Approved for Use
as Legal Measuring Instruments:
Linearization after Transport
After transport, the linearity and calibration of your
balance may be out of the permissible tolerances
(see the “Specifications”). Always carry out internal
linearization of the balance after transport.
Repeating this procedure – several times, if necessary –
enhances the linearization. This procedure is described
on page 1–35.
Preparing a Verified Balance for Use as a Legal
Measuring Instrument:
After initially connecting the balance to AC power
(or after a relatively long power outage), allow
it to warm up for at least 24 hours.
1–6
Equipment Supplied
The equipment supplied includes the components
listed below:
MC 210 S, MC 210 P and MC 410 S (-0CE)
– Weighing cell
– AC adapter
– Weighing pan
– Protective disk
– Protective ring
– Interior weighing chamber draft shield
– 2 draft shield covers
– Dust cover for the draft shield and the
balance housing
– Dust cover for the display unit
MC 5 (-0CE) and SC 2 (-0CE)
– Weighing cell
– Draft shield
– Electronic computing device
– Connecting cable
– Power supply
– Kit of standard accessories
– Inner draft shield (models SC 2 and SC 2-0CE only)
The kit of standard accessories contains
the following:
– Weighing pan
– Protective disk
– Brush
– Forceps
– Lint-free cloth
MC 21 S
– Weighing cell
– Electronic computing device
– Connecting cable
– Power supply
– Protective disk
– Protective ring
– Weighing pan
1–7
Installation Instructions
Ambient Conditions
Before you set up your balance, choose a suitable
place which meets the following requirements:
– level, low-vibration weighing table
or a wall console;
– no direct exposure to sunlight, heaters, or similar
sources of heat. This can considerably
increase the temperature inside the draft shield
(greenhouse effect), resulting in incorrect readouts
due to convection currents, turbulence and
buoyancy effects;
– no drafts from open windows or doors;
– avoid brief fluctuations in room temperature.
The balance is not allowed to be used in hazardous
areas/locations where there is danger of explosion.
Do not expose the balance to extreme moisture
over long periods. Moisture in the air can condense
on the surfaces of a cold balance whenever it
is brought to a substantially warmer place.
If you transfer the balance to a warmer area, make
sure to condition it for about 2 hours at room
temperature, leaving it unplugged.
1–8
Using Verified Balances Approved as
Legal Measuring Instruments in Europe
(only applies to MC5-0CE)
Using Verified Balances as Legal Measuring
Instruments
You must calibrate the balance at the place
of installation before using it as a legal measuring
instrument (see the section entitled “Calibration/
Adjustment” starting on page 1–31).
This balance is not allowed to be used for weighing
goods intended for direct sale to the public. The
type-approval certificate for verification applies only
to non-automatic weighing instruments; for
automatic operation with or without auxiliary
measuring devices, you must comply with the
regulations of your country applicable to the place
of installation of your balance. A suitable
thermometer and barometer are recommended for
monitoring ambient conditions.
For balances of accuracy class k, a thermometer
and barometer are recommended for monitoring
ambient conditions. The temperature range
indicated on the verification ID label must not be
exceeded during operation.
The balance must warm up for at least 24 hours
after initial connection to AC power or after
a relatively long power outage.
The legal background for using Sartorius balances
in legal metrology is the EC Council Directive
No. 90/384/EEC for non-automatic weighing
instruments, which has been in effect since
January 1,1993, within the Internal European
Market, as well as the accreditation of the
Quality Management System of Sartorius AG
by Lower Saxony’s Regional Administrative
Department of Legal Metrology (Niedersächsische
Landesverwaltungsamt – Eichwesen) from
February 15, 1993.
1–9
Getting Started
MC 210 S, MC 210 P and MC 410 S (-0CE):
Place the components listed below inside the
weighing
chamber one at a time in the order given:
– Shield disk (8)
– Weighing pan (7)
– Protective ring (6)
– Interior weighing chamber draft shield (5)
(only on MC 210 S, MC 210 P (-0CE))
– Place the small draft shield cover (2) on top of the
semicylindrical interior draft shield door (4).
Then place the large draft shield cover (1) on top
of the semicylindrical exterior draft shield element (3).
Secure the draft shield cover in place using the
fastener (see arrow).
Important Note Concerning Verified Balances
Approved for Use as Legal Measuring Instruments:
Provided that an official lead seal is required for the
verified balance, a control seal is affixed to the
balance. Unauthorized attempts to remove this seal
will irreversibly damage it. If you break the seal,
the validity of the verification will become void, and
you must have your balance subsequently verified.
1–10
Adjusting the Exterior Draft Shield Element
Turn the exterior draft shield element (3) by the riffled
part on the bottom to the position you desire.
Depending on your application, you can define
the menu code so that the interior draft shield door (4)
is operated by motor or by hand (see section
starting on page 1–21).
Adjusting the Swivel-Mounted Display Unit
Move the swivel-mounted display unit (11) around
the base of the draft shield to adjust it to the position
you desire (+/– 85°).
MC 21S:
Installing the Components
§ Place the following components on the balance in
the order given below:
– Shield plate
– Weighing pan
Note: To position the weighing pan, rotate it back
and forth while pressing down gently.
– Protective ring
– Glass plate
1–11
MC 5 (-0CE) and SC 2 (-0CE):
Assembling the Components
§ Place the components listed below on the
weighing cell (35) one at a time in the order given:
– Protective disk (8)
– Weighing pan (7)
Important Note: After placing the weighing pan
on the weighing cell, press down on it gently while
turning it slightly to the left and right.
– Inner draft shield (36) (models SC 2 and
SC 2-0CE only)
Installing and Adjusting the Draft Shield
– Place the small draft shield (34) on the weighing cell
and adjust it so that the gap fits over the projection
on the weighing cell (see arrows).
Connecting the Weighing Cell
to the Computing Device
Connect these two units so that the two points
where the connecting cable is attached to the female
connectors face each other (see arrows).
Tighten the screws on the female connectors by hand.
1–12
Connecting the Balance to AC Power
The balance is energized by a power supply/AC
adapter. Make sure that the voltage rating printed
on this unit is identical to your local line voltage.
If the voltage specified on the label or the plug design
of the power supply/AC adapter does not match
the rating or standard you use, please contact your
Sartorius office or dealer.
Important Note:
Use only original Sartorius power supplies/AC
adapters. Use of power supplies/AC adapters from
other manufacturers, even if these units have
an approval identification marking from a national
testing laboratory, requires the consent
of an authorized Sartorius service technician.
Detailed information on additional options
for powering the balance is available in our service
information bulletin, no.15/88 (for example,
using local extra-low voltage).
Plug the cord of the AC adapter/power supply into
the DC jack on the rear panel of the
balance/computing device. Then insert the plug
of
the power supply or the AC adapter into a wall outlet.
1–13
Voltage Selection
You can select the voltage if you use our portable
power supply (6971172) that has a European-type
plug (rounded prongs).
Safety Precautions
The power supply/AC adapter rated to Class 2 can
be plugged into a wall outlet without taking any
additional safety precautions. The pole of the output
voltage is connected to the balance housing, which
can be grounded for operation.
The data interface (see also “Interfacing Devices”
on page 1–36) is also electrically connected to the
balance housing (ground).
Information on Radio Frequency Interference
Warning!
This equipment generates, uses and can radiate radio
frequency energy and,if not installed and used in
accordance with the instruction manual, may cause
interference to radio communications. It has been
tested and found to comply with the limits for a Class A
computing device pursuant to Subpart J of Part 15 of
FCC rules, which are designed to provide reasonable
protection against such interference, when operated
in a commercial environment. Operation of this
equipment in a residential area is likely to cause
interference, in which case the user at his own
expense will be required to take whatever measures
may be required to correct the interference.
Connecting Electronic Devices (Peripherals)
Make sure to unplug the balance from the power
supply/AC adapter before you connect or disconnect
a peripheral device (printer or PC) to or from the
interface port.
1–14
230 V~ 115 V~
Leveling the Weighing Cell Using the Level Indicator
At the point of use, level the weighing cell using the
leveling feet (9) so that the air bubble is centered
within the circle of the level indicator (10).
To level the weighing cell using the level indicator
as a guide:
Extend the leveling feet (turn clockwise) to lift the
weighing cell.
Retract the feet (turn counterclockwise) to lower the
weighing cell.
1–15
General Instructions for
“Analytical Weighing”
Weighing Electrostatically Charged Samples
and Containers
Major measuring errors can occur when
electrostatically charged samples and containers are
weighed. This problem particularly involves samples
that have an extremely poor electrical conductivity
(glass, plastic, filters) since they can discharge
electrostatic – i.e., friction-induced – charges only
over a relatively long period of time. The result
is an interaction of forces among the charges
adhering to the sample and the stationary components
of the balance (base plate of the weighing chamber,
draft shield construction, balance housing). This
is noticeable when the weight readout drifts. At a
high humidity, this effect is not so pronounced or does
not even occur at all due to the thin layer of water that
condenses on the sample and, through conductive
discharge, counteracts interfering static electricity.
In addition to taking purely mechanical counteractive
measures (protecting the sample using a special
antistatic weighing pan – see the “Accessories”), you
can neutralize the surface charges by “bombarding”
them with ions of the opposite polarity. This
is an extremely effective method of eliminating static
electricity on surfaces (antistatic ionizing blower,
order no. YIB01).
The balance’s environment, including the operator,
can considerably interfere with weighing on account
of static electricity. The balances of the MC Series
have been designed to counteract this phenomenon:
the glass surfaces of the draft shield have a special
metallic coating.
The rear panel of the balance/weighing cell
has a terminal (15) for connecting an equipotential
grounding conductor. It is used for additionally
grounding a peripheral device (for example,
a vibrating spatula). This terminal is designed for
single grounding wires up to .25” standard gauge
or 6 mm2and for .18” standard gauge or 4 mm
2
stranded wires.
1–16
Weighing Magnetic or Magnetizable Samples
It is technically impossible to avoid the use
of magnetizable materials in the manufacture
of balances. Ultimately, the operating principle
of high-resolution balances is based
on electromagnetic force compensation of the load
placed on the weighing pan.
When magnetic or magnetizable samples
or containers (e.g., beaker with a stirrer) are weighed,
interactions among the above-mentioned
components of the balance may occur, distorting
weight readouts.
Unlike deviations caused by electrostatic charges,
magnetic interference is usually constant over
time. However, it is sensitive to and depends on the
position of the sample or container on the
weighing pan and is also characterized by poor
reproducibility.
To reduce the effect described above, we recommend
increasing the distance between the sample and
the weighing pan by using a non-magnetizable
material (the reduction in force is proportional to the
quadrate of the distance). In special cases,
soft-magnetic plates should be used to shield against
interfering magnetic effects.
In the presence of extremely strong magnetic fields –
for instance, when measuring the susceptibility
of a sample in an electromagnet – you should use
the below-balance weighing port which comes
standard on your balance.
1–17
1–18
General Instructions for Handling Samples
and Containers
As a general rule, the sample to be weighed should
be conditioned to the temperature of the balance.
This is the only way to avoid air buoyancy errors and
deviations caused by convection currents at the
surface of the sample. Since these effects increase
proportionally to the volume and surface of the
sample, make sure that the size of the tare vessel
selected is in the appropriate proportion to the size
of the sample to be weighed.
Never use your bare hands to touch samples
to be weighed. In addition to the effect on the
temperature, the extremely hygroscopic behavior
of fingerprints left on the sample will cause
considerable interference during weight measurement.
Use forceps or other suitable utensils to place your
sample carefully on the pan.
Working with your balance requires a steady hand
and a smooth, uninterrupted technique.
Perform a few trial weighing operations before you
begin with the actual weighing of your sample
because the temperature in the weighing chamber
may
differ from that of the balance’s surrounding
environment, if the weighing chamber has not been
opened for a relatively long period.
When you open the weighing chamber, a change
in temperature will inevitably occur, due to the
laws of physics, and may show up as a change
in the weight readout. In this case, we recommend
that before you begin
the actual weighing series you
open and close the
weighing chamber at the same
rate as you will be doing during weighing.
After the weighing chamber has been closed, the
weight readout will usually stabilize after about
10 seconds. The accuracy of the weight readout will
increase as you perform successive weighing
procedures with greater consistency.
Operating the Balance
Balance Display
The display shows the following special codes
for your information:
OFF
The balance was disconnected from AC power
(power failure or outage; the balance was reconnected
to AC power).
O (standby)
The display has been turned off by the e key (31).
The balance is now in the ready-to-operate mode.
b (busy)
Once you have turned on the balance, the b symbol
will be displayed until you press a key.
During operation, this symbol indicates that the
balance processor is still busy processing a function
and will not accept commands to perform any other
functions at this time.
CAL I
The balance has internal calibration weights and
can be calibrated using the f key.
R1 W or R2 W
The number in the R code identifies the particular
weighing range you have selected.
W
Symbol for the application selected (in this case,
the weighing mode and toggling among the
weighing ranges).
Important Note:
If the W symbol flashes, this means that the balance
wants to self-calibrate (see pp.1–30).
1–19
Turning the Display On and Off (Standby Mode)
Press the e key (31) to turn the display on or off.
Self-Test
After the balance has been turned on, an automatic
self-test of the balance’s electronic circuitry
is performed, and the draft shield closes automatically.
When a zero readout is displayed, the balance
is ready for operation.
Automatic Warmup of the Balance Electronics in
MC 210 S, MC 210 P and MC 410 S (-0CE), MC 21 S
Once you have connected the balance to AC power
and turned on the power, the balance’s electronics
automatically begin to warmup. The timer for
warmup is set to 4 minutes. The remaining warmup
time in minutes and seconds is displayed in
a countdown mode.
When the remaining time displayed is less
than one minute, you can interrupt this warmup
procedure by pressing the e key to turn the
balance off and back on again. Following
the self-test and display of a zero readout,
the balance is ready to operate again.
After 4 minutes have elapsed, the balance displays
a zero readout and is then ready to operate.
* = including the Signatories of the Agreement on
the European Economic Area
Important Note Concerning Verified Balances
Approved for Use as Legal Measuring Instruments
in the E.U.*
For verified balances that have a verification
scale interval “e” which is greater than the scale
interval “d,” and a scale interval “d” ≥0.1 mg,
the last digit on the display is bordered.
1–20
Opening and Closing the Draft Shield
MC 210 S, MC 210 P or MC 410 S (-0CE):
To load small objects, open the draft shield only
as far as is absolutely necessary for your application.
This reduces the amount of draft so your balance
will stabilize faster than it normally does when the draft
shield is wide open.
You have several options for operating the interior
draft shield door (4):
– Semi-automatically using the l or r key (23)
(max. aperature angle: 170°)
– Using an external foot or hand switch
(see part 5, “Accessories”)
– By a command from an on-line computer
(see part 4, “Interface Description”)
– Fully automatically, e.g., for the functions tare,
calibration, print, etc. (see part 2, “Balance
Operating Menu”)
– With a special display mode while the draft shield
is open (see part 2, “Balance Operating Menu”)
– Manually
Semi-automatic Mode with an Aperture
Angle of 10° to 140°
By a “self-teaching” function, the draft shield door
can “learn” to open automatically to a user-defined
aperture angle between 10° and 140°:
To define this angle, manually move the interior draft
shield door (4) to the desired position.
1–21
Press either l or r to close the draft shield
automatically by motor. While closing, the interior
draft shield door moves slowly. The previously
adjusted aperture angle is stored.
If you press either l or r once again, the draft
shield door will open at a faster speed to the position
you have selected. Press l or r for approx.
2 seconds to open the draft shield door
automatically
as far as it will go (170°).
You can always change the aperture angle
by manually adjusting the position of the draft
shield door.
Important Note
The aperture angle remains stored even after you
have turned off the display by pressing e.
A stored aperture setting will not be erased until
you unplug the balance from AC power.
Manual Mode
Of course, you can also open and close the draft
shield door by hand.
1–22
MC 5, SC 2 (-0CE):
You can operate the motorized draft shield (34) in one
of the following ways:
– Semiautomatically using the l or r key (23)
(aperature angle approx.100°)
– Using an external foot or hand switch
(see part 5, “Accessories”)
– By a command from an on-line computer
(see part 4, “Interface Description”)
– Fully automatically, e.g., for the functions tare,
calibration, print, etc. (see part 2, “Balance
Operating Menu”)
– With a special display mode while the draft shield
is open (see part 2, “Balance Operating Menu”)
– Manually
1–23
Semi-automatic Mode with the Aperture Angle
of Your Choice
To define the aperture angle and the direction in
which the draft shield opens, move the draft shield to
the desired position manually (aperture angle 45°
to 315°).
Press either the l or r key (23) to have the
draft shield closed by motor. The previously adjusted
aperture angle and the direction are stored in
the
process.
You can always change the aperture angle by
manually adjusting the position of the draft shield.
You can clear the aperture angle by either
– entering an aperture < 45° using the numeric keys
(e.g., “0”) and confirming this entry by pressing
the l or r key
or
– by closing the draft shield manually
Important Note:
The aperture angle and the direction in which the
draft shield opens remain stored even after you have
turned off the display using the e key.
This information will not be erased until you unplug
the balance from AC power.
1–24
Numeric Entry of an Aperture Angle
The numeric entry of an aperture angle corresponds to
a fixed position. The aperture is measured counterclockwise starting from the closed draft shield position:
– Enter an aperture angle between 45° and 315°
using the numeric keys (20); e.g., 210
– Confirm this entry by pressing either the
l or r key (23), depending on the direction
you wish the draft shield to open
– The aperture angle and the direction are now
stored for further operation
You can clear the aperture angle by either
– entering an aperture < 45° using the numeric
keys (e.g., “0”) and storing this entry by pressing
the l or r key
or
– by closing the draft shield manually
Important Note:
The aperture angle and the direction in which the
draft shield opens remain stored even after you have
turned off the display using the e key. This
information will not be erased until you unplug the
balance from AC power.
Opening and Closing the Draft Shield Manually
Of course, you can also open and close the draft
shield by hand.
Important Note:
An open draft shield will always close automatically
if you have not operated the balance for 1 minute.
!
Exception:
– It will not close automatically if you have set menu
code 8 8 1 “Automatic draft shield function off”
(see part 2, “Balance Operating Menu”)
1–25
Simple Weighing
Place your sample on the weighing pan (7), and close
the draft shield door. Read off the weight indicated
on the display (28) only after the weight unit (“g”, or a
different
unit selected – see part 2, “Balance
Operating Menu”)
appears as the stability symbol.
Taring
If you wish to use a container or if the weight display
does not indicate 0.000 mg (depending on the
display mode or weight unit selected), zero the display
before you weigh.
To do so, press t key (26).
During taring, you can have the fully automatic draft
shield function either on or off.
For more information on turning this fully automatic
draft shield function on or off by menu code, refer to
part 2, “Balance Operating Menu.”
Important Note for Verified Balances Approved for
Use as Legal Measuring Instruments:
The small circle in the weight display (on the left)
shows that the balance is exactly tared to “0”
(± 0.25 of a scale interval).
Important Note Concerning Verified Balances
of Accuracy Class k
To avoid measuring errors, the respective air density
must be allowed for. The following formula is used to
calculate the mass of the sample:
1– ρL/8000 kg m
–3
m = n
w
1– ρL/ρ
m = mass of the sample
nw= weight readout
ρ
L
= air density during weighing
ρ = density of the sample
1–26
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