Switching On The Measuring Instrument; Measuring - wtw 315i Operating Manual

pH 315i
Selecting the pH
resolution
AutoRead
(drift control)
Temperature
probe

Switching on the measuring instrument

l Press the <
> key.
Display test appears briefly on the display.
Subsequently, the slope and asymmetry used appear for approx. one
second one after the other. In addition, the calibration procedure of the
last calibration is shown (AutoCal TEC or AutoCal DIN or no display in
the delivery state or following initialization).

Measuring

Overview of the measuring modes:
pH value
Special functions:
If you press <M> while pressing the <RUN/ENTER> key, the resolution
swaps between 0.01 and 0.001.
The AutoRead function checks the stability of the measurement signal. Acti-
vate AutoRead with <AR>. The current measured value is frozen. Thus, the
<AR> key can also be used as a "hold function" to freeze the measured val-
ues. Press <RUN/ENTER> to start the AutoRead measurement. During the
AutoRead measurement, AR flashes on the display until a stable measured
value is reached. This can be terminated at any time taking over the current
measured value with <RUN/ENTER>.
Basically, pH measurements should only be performed with a temperature
probe. The temperature probe is shown on the display by TP.
If you nevertheless use an electrode without a temperature probe, the instru-
ment operates with a reference temperature of 25 °C. Thus, the sample and
calibration solution must have their temperatures adjusted to 25 °C in order
to avoid larger measurement errors.
Note
The pH meter automatically recognizes the type of temperature probe used.
This enables electrodes to be connected with NTC30 or Pt1000.
Switching on the measuring instrument
Redox-
voltage
<M>
mV
5