29
MODEL 1054B pH/ORP
SECTION 4.0
CONFIGURATION
4.9 AUTOMATIC BUFFER MODE (1054B pH only).
Display Mnemonic
AbF
. Software selectable
on
or
oFF
.
Factory setting is
on
. With the
oFF
setting, calibration
is performed according to Section 5.3.2, without auto-
matic recognition and temperature compensation of
the buffers.
The automatic buffer calibration feature (
on
setting)
provides automatic recognition of up to three of the
buffers listed below (selectable in Section 5.3.1). In
addition, each buffer selection incorporates a temper-
ature curve from 0-50°C so that the user does not
need to determine the correct buffer pH which corre-
sponds to the buffer temperature (for best accuracy in
extreme temperature environments).
The stored buffer-temperature curves were generated
from reference data according to NBS (National
Bureau of Standards - U.S.), DIN 19266 (Germany),
BSM (British Standards Method), and JIS 8802
(Japan) standards. The buffers are supplied by a wide
variety of vendors.
NOTE
If any buffers other than those listed here
will be used (such as some Fisher or Ingold
buffers), the
AbF
setting should be
oFF
and
calibration instructions followed in Section
5.3.2.
4.9.1 Automatic Calibration Setup.
1.
Enter the Set mode by pressing the
ACCESS
key
twice.
2.
SCROLL
(
é
) until
AbF
appears on the display.
3.
Press
SELECT.
on
or
off
will be displayed.
4.
Press
SCROLL
(
é
) if the desired item is not dis-
played. Then press
ENTER
. You will be returned
to the set menu.
Buffer Value
Standards Referenced
Buffer Composition
Factory
at 25°C
Selection
1.68
NBS, DIN 19266, JIS 8802
0.05M K tetroxalate
3.56
NBS, BSM
KH tartrate (sat'd @ 25°C)
3.78
NBS
0.05M KH
2
citrate
4.01
NBS, DIN 19266, BSM, JIS 8802
0.05M KH Phthalate
*
4.64
BSM
0.1M HOAc
0.1M NaOAc
6.86
NBS, DIN 19266, BSM, JIS 8802
0.025M KH
2
PO
4
*
0.025M Na
2
HPO
4
7.41
NBS, JIS, 8802
0.0087M KH
2
PO
4
0.0302M KH
2
HPO
4
9.18
NBS, DIN 19266, BSM, JIS 8802
0.01M Na
2
B
4
O
7
*
10.01
NBS, BSM, JIS, 8802
0.025M NaHCO
3
0.025M Na
2
CO
3
12.45
NBS, DIN 19266
Ca (OH)
2
(sat'd @ 25°C)
TABLE 4-4. Buffer Standards
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