88. . Devices and Manual Operation
Devices and Manual Operation
726 Titroprocessor, Short Introduction
23
23
Calibration
pH sensors at the measuring inputs A1, A2, Adiff, B1, B2, Bdiff can be cali-
brated. Calibration data remain until changed even when the 726 is
switched off. The softkey [Calibr.] opens the calibration window.
ÚÄÄÄ Calibration ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ ³
³ Meas. parameters A1: # Buffer pH val. T[øC] pH cor. Val.[mV] ³
³ ---------- ------- ----- ------- -------- ³
³ Signal drift 2 mV/min 1 Metrohm 4.000 ³
³ Equilibr.time 110 s 2 Metrohm 7.000 ³
³ Temperature 25.0 øC 3 Metrohm 9.000 ³
³ Buffer type Metrohm 4.00 ..9.00 ³
³ ³
³ Buffer 1 pH 4.000 ³
³ ³
³ ³
³ ³
³ ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Quit ÄÙ
The calibration parameters ‘
Signal drift
’, ‘
Equilibration time
’ and
‘
Temperature
’ can be modified.
Buffers can be defined one by one or a preset buffer series can be used.
Select a buffer type or manufacturer first and add a buffer set to the buffer
table by pressing the softkey [Preset series] or [Add series]. Press the [Start
Stop] softkey to start the calibration process. Each buffer listed in the buffer
table will be requested and measured after the [Start Stop] softkey is
pressed. The measured values will be displayed in the buffer table.
It is also possible to calibrate without a preset buffer table.
You can define the buffers (type and value) one by one.
Select a buffer type, enter a pH value and press the softkey [Start Stop]. The
potential will be measured and the results added to the buffer table. After
you have done this at least twice the calibration curve may be viewed by
pressing the [Show curve] softkey. With the calibration curve the resulting
values for ‘slope’ and asymmetry potential pH
as
will be shown too.
Calibration data are assigned to the measuring input (e.g. A1) and are
stored in the Titroprocessor. The calibration data can be viewed at any time.
Before recalibrating a sensor, clear the previous calibration with the [Clear
calibr.] softkey. An incorrect calibration can be deleted with the [Cancel
calibr.] softkey. The previous calibration data will be restored.
The ‘
Devices & Manual Control
’ page will always show the current calibra-
tion data for each measuring input, including the name of the calibrated
sensor, the calibration method (calibrations can be done automatically
within a method sequence) and date and time of calibration. The calibration
results pH
as
and slope may be edited manually, if necessary. This will over-
write any existing calibration.
³ Sensors at interface A
³
³ Meas. input A1 A2
³ Sensor 6.0238.000 6.0203.100
³ Cal. sensor 6.0238.000 comb. glass
³ Cal. method manually * by edit *
³ Cal. date 96-10-28 96-10-28
³ Cal. time 10:08:14 10:12:48
³ pH(as) 6.987 7.000
³ Slope 0.958 1.000
