Ph Calibration - wtw Multi 1970i Bedienungsanleitung

Multi 1970i
Salt content
correction in
O measurements
2
Reference
temperature of the
conductivity, Tref
AutoCal TEC
Calibration
evaluation
Display
Asymmetry
[mV]
Slope
[mV/pH]
A salt content correction is required in the oxygen concentration
measurement of samples with a salt content of more than 1 g/l. To do so,
press the <CAL> repeatedly until Sal appears on the display. Then enter the
salt content with <▲> <▼>. Switch on the salt content correction with <▲>
while pressing the <RUN/ENTER> key (display SAL). To switch it off, press
<▼> while pressing the <RUN/ENTER> key.
The reference temperature can be switched between 20 °C and 25 °C. It
appears on the display as Tref20 or Tref25. To switch over the reference
temperature, see C
ONFIGURING

pH calibration

This process is specially adapted to the WTW technical buffer solutions as a
fully automatic single or two-point calibration. The buffer solutions are
automatically recognized by the measuring instrument. Depending on the
instrument setting, the instrument displays the relevant buffer nominal value
or the current electrode voltage in mV.
Valid buffers (values at 25 °C): 2.00 / 4.01 / 7.00 / 10.01
Note
The calibration for pH 10.01 is optimized for the WTW technical buffer
solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an
erroneous calibration. The correct buffer solutions are given in the WTW
catalog or in the Internet.
After calibrating, the measuring instrument automatically evaluates the
calibration. The asymmetry and slope are evaluated separately. The worst
evaluation appears on the display.
-15 ... +15 -20 ... +20
-60.5 ... -58 -58 ... -57
Note
If a printer is connected to the interface, a calibration protocol is automatically
printed after a valid calibration.
.
-25 ... +25 -30 ... +30
-61 ... -60.5 -62 ... -61
or or
-57 ... -56 -56 ... -50
pH calibration
E3
Invalid
calibration
< -30 or
> 30
< -62 or
> -50
21