wtw pH 315i, Operating Manual

Page: 15 / 44

pH 315i Operation
15
4.2.1 Measuring the pH value
Changing the
pH resolution
The measuring instrument shows the pH measured value with a reso-
lution of 0.01 or 0.001 (default setting is 0.01). To change over the res-
olution, press the <M> key while pressing the <RUN/ENTER> key.
AutoRead AR
(drift control)
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
1 Perform the preparatory activities according to section 4.2.
2 Immerse the pH electrode into the test sample.
3 Press the <M> key until pH appears on the status display. The
pH value appears on the display.
2
%
.
1
S
Time Baud
Day.Month No.
Ident Year
LoBat
CalError TempError
ARng AR RCL
AutoCal DIN
AutoCal TEC ConCal
Auto Store
°F
mg/L
mV/pH
mol/L
% ppm
U ISE
∆
8 4 2
99 6
°C
pH
TP
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with <M>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
3 Start AutoRead with <RUN/ENTER>.
The AR display indicator flashes until a stable signal is
reached.
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate AutoRead: Press the <AR> key.