Measuring The Ph Value - wtw pH 315i Operating Manual

pH 315i
Changing the
pH resolution
AutoRead AR
(drift control)

4.2.1 Measuring the pH value

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.
∆
ISE U pH
S
1 6 9 9
Time Baud
. 2 4
Day.Month No.
Year Ident
Auto Store
AutoCal DIN
LoBat
AutoCal TEC ConCal
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.
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:
Reproducibility
Better than 0.02
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.
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
mol/L
2
mV/pH
% ppm
mg/L
°F
8
%
TP
°C
CalError TempError
ARng AR RCL
Response time
> 30 seconds
Operation
15