Performing 2-Point Calibration - OHAUS ST300 Instruction Manual

STARTER 300 Portable pH Meter
When STARTER 300 is in pH measurement mode (see 4.2) and Auto End point Mode.; place
the pH electrode in your chosen calibration buffer, stir for 10 seconds, and wait 30-60 seconds,
then:
Press button-

and appear on the top of the screen,
The meter reaches the calibration (e.g. 7.00) value with the temperature display on the

screen.
The 1-point calibration is finished. There are now 3 options (OHAUS recommends conducting at
least a 2 point calibration);
1. Press button-
slope are shown on the display for 3 seconds then return to the measurement
screen.
2. Press button-
measurement screen.
3. Rinse pH electrode then put into another buffer, press button-
point calibration.(see 4.1.3)
4.1.3

Performing 2-point calibration

Perform 1-point calibration as described above.

Rinse the pH electrode with pure water.

Place the electrode in the next calibration buffer, stir and wait, then press button-

2" displays on the bottom left of the screen and "Cal " is blinking.
top of the screen,
The meter reaches the calibration (e.g. 4.01) with the temperature display on the screen.

The 2 point calibration is finished. There are now 3 options :
1. Press button-
2. Press button-
measurement screen.
3. Press button-
slope are shown on the display for 3 seconds then return to the measurement
screen.
Note: To perform a 3 point calibration, follow the instructions for performing a 2 point calibration
using a third buffer.
. "Cal 1" displays on the bottom left of the screen and "Cal " is blinking.
to store the 1-point calibration and exit, the offset and the
to reject the calibration, the meter then returns to the
is blinking during calibration.
to do the 3-point calibration.
to reject the calibration, the meter then returns to the
to store the 2-point calibration and exit, the offset and the
is blinking during calibration.
EN-11
to do the 2-
, "Cal
and appear on the