Automatic Buffer Mode; Relay States For Various Analyzer Conditions & Alarm/Default Config. 28 4-4 Buffer Standards - Emerson Rosemount 1054B Instruction Manual

MODEL 1054B pH/ORP
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.
Buffer Value Standards Referenced
at 25°C
1.68 NBS, DIN 19266, JIS 8802
3.56
3.78
4.01 NBS, DIN 19266, BSM, JIS 8802
4.64
6.86 NBS, DIN 19266, BSM, JIS 8802
7.41
9.18 NBS, DIN 19266, BSM, JIS 8802
10.01
12.45
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TABLE 4-4. Buffer Standards
NBS, BSM
NBS
BSM
NBS, JIS, 8802
NBS, BSM, JIS, 8802
NBS, DIN 19266
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.
SCROLL (é) until AbF appears on the display.
2.
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 Composition
0.05M K tetroxalate
KH tartrate (sat'd @ 25°C)
0.05M KH citrate
2
0.05M KH Phthalate
0.1M HOAc
0.1M NaOAc
0.025M KH PO
2
0.025M Na HPO
2
0.0087M KH PO
2
0.0302M KH HPO
2
0.01M Na B O
2 4 7
0.025M NaHCO
0.025M Na CO
2
Ca (OH) (sat'd @ 25°C)
2
SECTION 4.0
CONFIGURATION
Factory
Selection
*
*
4
4
4
4
*
3
3
29