2-Point Calibration (Calibration Mode: Auto) - Optex SE-pH-D Instruction Manual

2-point calibration (Calibration mode: Auto)

The 2-point calibration corrects for errors in both the offset and span of the
pH sensor. Because both the offset and span change over time, the 2-point
method takes precedence.
For the 0 point, select the pH7 calibration solution (standard solution), and
select the 2nd calibration solution (standard solution) that is close to the
normal operating range (pH4.01 or pH10.00).
・ The 2-point calibration is for pH measurement. It does not affect
ORP measurement.
・ In 2-point calibration, the span error can be minimized by
Caution
using a calibration solution (standard solution) that is close to
the value expected from the measurement water for the 2nd
calibration solution (standard solution).
Clean the sensor body and electrode surface.
1
Prepare the calibration solution (standard solution) of the selected
2
pH for the 1st calibration solution (standard solution) and immerse
the sensor.
Allow the sensor to settle to the temperature of the calibration
3
solution (standard solution) for about 5 minutes with little change
in temperature, then check that there are no bubbles on the
electrode surface.
Press
4
The sensor selection display is displayed.
Select a channel connected to
5
SE-pH-D using
press
The calibration menu is displayed.
.
, and
.
Sensor model
Measurement item
Sensor channel
33