3 concal, Concal, S y a – Xylem handylab pH LF 12 User Manual
Page 32
Operation
handylab pH/LF 12
32
ba75370e03
11/2009
4.3.3
ConCal
Two-point
calibration
For this procedure, use two buffer solutions:
z pH 7.0 ± 0.5
z any other buffer solution
Note
Skip the steps 2 and 9 if you use a pH electrode with a temperature probe or
the temperature probe of a conductivity measuring cell.
Note
At this point, the ConCal calibration can be broken off with
sponds to a single-point calibration. When doing so, the instrument uses
the Nernst slope (-59,2 mV/pH at 25 °C) and the fixed asymmetry of the elec-
trode.
1
Press the
Cal function display appears. The sensor symbol displays the
evaluation of the last calibration (or no sensor symbol in the de-
livery state or after the measurement parameter has been re-
set).
2
If required, enter the temperature of the first buffer solution with
<
▲> <▼> while keeping the
3
Immerse the pH electrode in the first buffer solution (pH 7.0 ±
0.5 in two-point calibration).
4
Press the
The measured pH value appears on the display.
5
Set the measured value to the nominal pH value of the buffer
solution (at the current temperature) with <
▲> <▼>.
6
When the measured value is stable, press the
key. The value of the asymmetry appears.
7
Press the
/
K
cm
Sal
1
S
O
U
8
°
F
%
1/cm
mV/pH
S/
m
cm
M
%
mg/l
mbar
Lin
Tref25
nLF
Time
Baud
Day.Month No.
Ident
Year
LoBat
AutoCal DIN
AutoCal TEC
RCL
Auto
Store
ARng
AR
TDS
Sal
Tref20
8
4
2
S Y
A
pH
Cal
°
C
TP