Performing 1-Point Calibration; Performing 2-Point Calibration - OHAUS STARTER2200 Manual De Instrucciones

STARTER 2200 Bench pH Meter
o
After powering the meter on, be sure the top of the screen shows
the meter is in Auto End point Mode.
Mode Switch
o
Press and hold
4.1.3

Performing 1-point calibration

Calibration: pH electrodes need to be calibrated with pH standard buffer solutions before a
proper pH measurement can be made. Calibration is to display the correct pH value when the
meter receives 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 which means 100% slope);
Offset: the mV value when pH value is 7.00. (Theoretical value is 0 mV);

Begin by ensuring the meter is plugged in, the electrode is properly attached and the meter is
powered on by pressing

Place the pH electrode in the prepared buffer solution, stir for approximately 5 seconds and
wait for an additional 30-60 seconds.

Press button-
measurement icon

When the reading is stable (normally the reading does not change in 5s), press button-
to lock the reading and finish 1 point calibration. The buffer value (e.g. pH 7.00)
with the temperature is displayed on the screen; the meter can recognize the buffer
automatically (auto buffer recognition).
The 1-point calibration is finished; now we have 3 options:

Press button-
are shown on the display for 3 seconds then returns to the measurement screen.

Press button-

Press button-
Note: With the 1-point calibration only the offset is adjusted. If the pH electrode was previously
calibrated with 2-point calibration the previously stored slope will remain. Otherwise theoretical
100% slope (-59.16 mV / pH @25° C) will be used.
4.1.4

Performing 2-point calibration


Perform 1-point calibration as described above.

Rinse the pH electrode with pure water and wipe off water with a tissue.
to change the End Point Mode.
.
, "Cal 1" displays on the top left of the screen and is blinking. The
appears on the top of the screen,
to store the 1-point calibration data and exit, the offset and the slope
to reject the calibration and return to the measurement screen.
to do the 2-point calibration.
is blinking during calibration.
EN-11
to ensure