Carrying Out The Tec And Nist/Din Calibration; Procedures - wtw pHotoFlex pH Operating Manual

®
pHotoFlex pH
Preparatory activities
ba75975e05 10/2017
Perform the following preparatory activities when you want to calibrate:
1 Connect the pH electrode to the meter.
The pH measured value display is displayed on the screen.
2 Keep the buffer solutions ready. Adjust the temperature of the
buffer solutions, or measure the current temperature if you
measure without a temperature sensor.
4.6.6 Carrying out the TEC and NIST/DIN calibration procedures
The two calibration procedures only differ in the usage of different buf-
fer sets (see section 4.6.5). Make sure the Cal. type is correctly set in
the pH & ORP / Calibration menu (see section 4.6.4).
For this procedure, use any one, two or three WTW technical buffer so-
lutions in ascending or descending order.
The TEC calibration is described below. With the NIST/DIN calibration,
the NIST/DIN buffer recognition and different nominal buffer values are
displayed. Apart from that, the procedure is identical.
The TEC 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 on the Internet.
1 Press the <M> key (short pressure) repeatedly until the mea-
sured parameter, pH or ORP is selected.
2 Start the calibration with <CAL/ZERO>.
The calibration display appears.
pH & ORP \ Calibration
i Buffer recognition TEC
i Immerse sensor in buffer 1
Continue
3 Immerse the electrode in buffer solution 1.
4 If the Set temperature menu item appears, measure and enter
the temperature of the buffer manually (measurement without
temperature sensor).
Operation
57