Calibration, Measurement And Print; Calibration; Buffer Group - OHAUS STARTER 5000 Manual De Instrucciones

EN-10
4

CALIBRATION, MEASUREMENT AND PRINT

The meter display will turn off automatically according to the time set in the menu System Setting
►Screen Protection ►LCD Auto-off. To turn on the screen again, tap the screen.(See 3.1)
A complete pH measurement process should follow the procedure:
a) Rinse the pH electrode and connect to meter
b) Prepare the buffer and calibrate the pH electrode
c) Prepare the sample
d) Conduct pH measurement of the sample
e) Record measurement data
f) Rinse the pH electrode and store
Prepare the pH electrode: the pH electrode should be rinsed with pure water before and after
usage. Check if the electrode is physically damaged. (Be careful with the glass bulb)
The pH electrode should be stored in the storage bottle. After the pH electrode has been put into
the sample or buffer solution, stir several seconds then wait 30 to 60 seconds for the signal to be
stable, and then press the button to operate (Calibration or measurement).
WARNING Do not operate the equipment in hazardous environments. The equipment
is not explosion protected.
CAUTION When using chemicals and solvents, comply with the instructions of the
chemical producer and the general lab safety rules.
4.1

Calibration

4.1.1

Buffer group

STARTER 5000 can perform 1-5 point calibrations for predefined buffer groups. For self-defined
buffer group, it can do 1-9 point calibration.
Before calibration, make sure the current buffer group is the group wanted.
When using a new pH electrode, a calibration should be performed before any measurement. If a
pH electrode is not used for a few days, a calibration should be performed before next usage.
Calibration is to display the right pH value when the meter receive the mV value signal from the
pH electrode.
Slope: the linear coefficient between mV and pH according to theoretical value (e.g. -
59.16mV/pH @ 25° C means 100% slope);
Offset: the mV value when the pH value is 7.00. (Theoretical value is 0 mV)
STARTER 5000 Bench pH Meter