Chapter 8.51 - Sartorius A200S Electronic Analytical Balance

Chapter 8.51 - Sartorius A200S Electronic Analytical Balance
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Chapter 8.51
Sartorius A200S Electronic Analytical Balance
(sartorius - )
1.0
T it le
Sartorius A200S Electronic Analytical Balance
2.0
Pu rp ose
The Sartorius A200S is a sophisticated, benchtop sized, top-loading electronic balance with auto tare
and auto calibration capabilities. Technical specifications are summarized as follows:
3.0
Weighing Range
202 g
Readability
0.0001 g
Tare Range
202 g
Standard Deviation
± 0.0001 g
Stabilization Time (typical)
3s
Display Update Rate
0.1 – 0.8 s (selectable)
Sensitivity Drift (283 to 313K)
± 2 × 10-6 K
Pan Dimension
90 mm radius
Sc ope
This document outlines the proper procedure for the use of this balance to measure the weight of
samples weighing up to 202 g.
4 .0 Ap p lic ab le Do cu me nts
Revision History
5 .0 De f in it ions & Proc es s T er mino log y
6.0
5.1
Pan: The location on the balance where the sample (and its vessel) sits to be weighed.
5.2
Zero: To define the empty pan as the zero point of the balance’s measurement scale.
5.3
Tare: To zero the balance when the pan is not empty. This is a standard weighing method
whereby the weight of the vessel holding a sample is automatically subtracted from the total
weight of vessel and sample together, by first zeroing the balance while the empty vessel sits
on the pan. After such an operation, a balance may display a negative number when the pan is
empty of both vessel and sample. When the sample is subsequently weighed in the vessel on
the pan, the balance will display the weight of the sample only.
Saf ety
There are no safety concerns associated with this instrument.
7 . 0 S t a t i st ic a l/ P r oce ss D a t a
N/A
sartorius
Chapter 8.51
8 .0 Pr oc ess No tes
Anything weighing up to 202 g which can fit inside the balance enclosure and sit stably on the pan may
be weighed on the Sartorius A200S. The enclosure doors should be closed before taking
measurements, in order to minimize error from air currents.
9 .0
O pe rat ing Pr oc edu re
9.1
9.2
9.3
9.4
Clean the Chamber and Pan
9.1.1
Open the chamber door and clear the chamber of any residue left behind by irresponsible
users. Be very careful not to hit the pan.
9.1.2
Use a soft brush or cleanroom wipe to gently brush the pan free of loose particles. This
is a sensitive area – be careful not to damage the sensors with excessive force to the
pan.
Level the Balance
9.2.1
In order to obtain accurate results, the unit must be level. Observe the leveling bubble at
the rear right of the chamber. If the bubble is not resting entirely within the black circle,
then the unit is not level.
9.2.2
To level the balance, change the height of the two rear feet of the unit by adjusting the
knurled black ring around each foot. Each foot is simply a threaded screw, so height is
adjusted by screwing into or out of the base. There is only one other (stationary) foot at
the front of the unit, so keep in mind while watching the bubble move that you are
adjusting two points of a three point arrangement.
9.2.3
If the ring around a foot will not turn, it may be screwed all the way in or out. Try turning it
the other way a few turns to give more room for adjustments. If this is not possible, do
not force it. Contact lab staff for assistance.
9.2.4
If the balance cannot be leveled within the range of adjustments of the feet, the unit may
be resting on a part of the benchtop which is too uneven. Slide the unit an inch or two
over to the side, and try leveling again.
Turn Power On
9.3.1
When the power is off and the unit is plugged into the wall power socket, the display
should show STANDBY.
9.3.2
Confirm that the pan is empty and the doors are shut. If the unit is set for auto-zero, it will
zero the balance at the time power is switched on. This should be done with an empty
pan. Tare should be done after zeroing, as it is not generally the same process.
9.3.3
Push the ON/OFF button. There is an automatic test of all electronic functions. The
display will blink, run through some numbers very quickly, and then show BUSY for a few
moments.
9.3.4
When it is done starting up, the display will show 0.0000 and the current measurement
unit (see Section 9.8 to change units).
Tare the Balance (optional)
9.4.1
If you wish to tare the balance, place your empty vessel on the pan.
9.4.2
Be sure all the enclosure doors are shut.
9.4.3
Press the T bar. Wait for the display to read 0.0000.
9.4.4
Remove the vessel. The display should show a negative number equal to the weight of
the vessel.
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sartorius
9.5
9.6
9.7
9.8
Chapter 8.51
Measure the Samples
9.5.1
Open one of the sliding doors of the enclosure.
9.5.2
Place your sample on the pan (to tare the balance, see Section 9.4).
9.5.3
Close all the doors of the enclosure.
9.5.4
Wait for the displayed value to settle. You do not need to press any buttons.
9.5.5
Record the measurement.
9.5.6
Open a sliding door and remove your sample.
9.5.7
If you have more samples go back to 9.5.2, otherwise close the door.
Turn Power Off
9.6.1
Push the ON/OFF button.
9.6.2
The display should read STANDBY.
Clean the Chamber and Pan
9.7.1
When you are finished, be courteous. Clean out the pan and chamber of any spills or
residue
9.7.2
Close all chamber doors.
Change Parameters (optional)
9.8.1
Certain parameters of the operation of the unit are easily changeable by the user. These
parameters are summarized in the table below.
Code
Environment
C111
C112
C113
C114
Very stable
Stable
Unstable
Very unstable
Code
Stability Range
Factory Setting
C121
C122
C123
C124
C125
C126
C127
C128
C129
0.25 digit
0.5 digit
1 digit
2 digits
54 digits
8 digits
16 digits
32 digits
64 digits
x
Code
Display Format
Factory Setting
C131
C132
C133
C134
last decimal on
last decimal off
last decimal at stability
all decimals at stability
x
Code
Tare Mode
Factory Setting
C141
without stability
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Factory Setting
x
sartorius
Chapter 8.51
C142
at stability
x
Code
Auto-Zero
Factory Setting
C151
C152
On
Off
x
Code
External Calibration
Factory Setting
C161
C162
Accessible
Inaccessible
x
Code
Internal Calibration
Factory Setting
C171
C172
Accessible
Inaccessible
x
Special Information
9.8.2
Code
Program Lock
Factory Setting
C411
C412
Off
On
x
Code
Beeper
Factory Setting
C431
C432
On
Off
x
Code
Weight Units
Factory Setting
C511
C512
C513
C514
C515
C516
C517
C521
C522
C523
C524
C525
C526
C527
C528
Grams
Kilograms
Carats
Pounds
Ounces
Troy Ounces
Parts/Pound
Taels Hong Kong
Taels Singapore
Taels Taiwan
Grains
Pennyweights
Momnes
Milligrams
Karats
Code
Function
Cxx0
Cx0
C0
Back up to second level
Back up to first level
End parameter change
To change any of these parameters, the instrument must be put into a special mode.
9.8.2.1 Start with the instrument turned off (see Section 9.3.1).
9.8.2.2 Push T and do not release.
9.8.2.3 Push and release ON/OFF. Keep holding T.
9.8.2.4 Wait a few moments for the display to read CH 5.
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sartorius
Chapter 8.51
9.8.2.5 Release T. The display should now read C 0, and will change about every
second to cycle through C 1, C 2, etc.
9.8.3
Parameters are set by specifying the code, one digit at a time. Available digits cycle
through each place at a rate of about one per second.
9.8.3.1 Allow the digit to change to the value desired.
9.8.3.2 Set the digit by pressing T when the correct digit is displayed.
9.8.3.3 When the 0 digit is displayed, pressing T will back the code up one place.
9.8.3.4 When any other digit is displayed, pressing T will select that digit and advance
the code to the next place.
9.8.3.5 When three digits have been selected, the parameter will be set and the display
will go back to C 0 (as in Section 9.8.2.5).
9.8.3.6 Current parameter settings are marked by a ° symbol in the upper right of the
display.
9.8.4
When finished changing parameters and the display goes back to C 0, press T while the
display reads C 0.
9.8.5
The display will read BUSY while it saves the settings. When it shows 0.0000 and the
unit of measurement (as in Section 9.3.4), the balance is ready with the new settings.
1 0 .0 T ro ub l es ho ot i ng G u id e l in es
10.1
The instrument will not turn on.
10.1.1 If the screen is totally blank, the unit may not be plugged in. Check the power cord.
10.1.2 If the screen says STANDBY, but cannot be turned on, consult lab staff.
10.2
The leveling rings won’t turn.
10.2.1 See Section 9.2.3. Do not force the rings. Turn the rings the other direction a few times
and try leveling again.
10.3
The instrument cannot be leveled (the bubble won’t go in the circle).
10.3.1 See Section 9.2.4. Slide the instrument over an inch or two and try again.
10.4
The balance is using the wrong measurement units.
10.4.1 The unit of measurement is a user-changeable parameter. See Section 9.8 about
changing parameters.
10.5
The pan is empty but the balance does not read zero.
10.5.1 Clean the pan. See Section 9.1.2.
10.5.2 Close the chamber doors to prevent error from air currents.
10.5.3 Turn the instrument off, and back on again. Unless the setting has been changed (see
Section 9.8.1), the balance automatically zeroes at startup.
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Chapter 8.51
1 1 .0 F i gu re s & S c he mat i cs
11.1 Sartorius A200S Electronic Balance
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sartorius
Chapter 8.51
11.2 Close-up of Control Panel
July 2005 - D. Bucher
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