Calibration; About Calibration - Horiba Scientific LAQUAtwin B-771 Instruction Manual

5

Calibration

5.1

About calibration

 Calibration points
The following 2-type calibrations are available.
 One-point calibration: calibration at 1.41 mS/cm
 Two-point calibration: calibration at 1.41 mS/cm and 12.9 mS/cm (sold
separately)
"One-point calibration" is set by default.
Refer to the instructions on page 18 for switching the calibration points.
The calibration point setting and calibration result are saved after the meter
is turned OFF.
 Precautions for calibration
 When using the sensor for the first time or again after several weeks of
disuse, perform electrode surface treatment, as instructed on page 8,
before calibration.
 Put an appropriate amount of the standard solution or a sample into
the measurement cell without bubbles inside. If not, the measurement
may be inaccurate.
Cell
 If remains blinking and Err (error display)
appears, the calibration is failed.
Check that the standard solution conductivity is
correct, and perform calibration again after
cleaning the sensor well.
 If the calibration is failed using correct standard solution(s), the sensor
may be deteriorated. Replace the sensor with new one (part No.:
3200459672).
 In two-point calibration, confirm that the calibration operations are
completed respectively for 1.41 mS/cm and 12.9 mS/cm. The calibra-
tion operation at 12.9 mS/cm cannot start until the calibration at 1.41
mS/cm is completed, and the whole calibration sequence is not com-
pleted until the calibration at 12.9 mS/cm.
Appropriate
Electrode
Cross-section of the measurement cell
9
Too little