wtw pH 1970i, Руководство по эксплуатации

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Operation pH 1970i
30 ba75690e01 01/2007
4.3.3 ConCal
Single-point calibration Use any buffer solution for this rapid method.
The calibration will be the more exact the nearer the pH value of the
buffer solution is to that of the test sample.
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
sensor.
1 Press the <CAL> key repeatedly until the ASY display indicator
and the Cal function display appear. The sensor symbol dis-
plays the evaluation of the last calibration (or no sensor symbol
in the delivery state or after the measuring parameters have
been reset).
2 If necessary, enter the temperature of the first buffer solution
with
<
▲
> <
▼
> .
3 Immerse the pH electrode in the first buffer solution (pH 7.0 ±
0.5 in two-point calibration).
4 Press the <RUN/ENTER> key.
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 Press the <RUN/ENTER> key. The value of the asymmetry
(mV) and the sensor symbol appear on the display.
7 Press the <RUN/ENTER> key. SLO appears on the display.
Auto REL1
TEC
Store
AR
1
LoBat nLF Lin Oxi
Tref25 Tref20
ARng
8
Time
Year Ident
No. Day.Month
Baud
Sal cm 1/
K /
%
RCL
REL2
pH / mV
m
cm
S/
% mg/ l
Sal
O
S pH
A
2 4 8
S Y
°
C
TP
Cal