Low Calibration Value Setting - Horiba Scientific LAQUAtwin B-74 Series Manual

7.7

Low calibration value setting

Used to change calibration value for low concentration. The setting range
and the initial setting depend on the meter model, as shown the table below.
If you prepare a calibration solution originally, change this setting as neces-
sary.
Meter model
B-741
B-742
B-743
Note
If this setting is changed from the default value, measurement results
may not meet the specified reproducibility. Perform calibration at a
concentration near the sample to be measured.
1.
Press and hold the MEAS switch for over 3
seconds in the measurement mode to
enter the special setting mode.
All items appear on the LCD, and then the dis-
play changes as shown right.
2.
Press the CAL switch until Lo.ch appears.
3.
Press the MEAS switch for 0.5 seconds.
The current setting is displayed.
4.
Press the CAL switch for 0.5 seconds to increase the value.
Pressing the CAL switch continuously increases the value in turn.
Pressing the CAL switch with the upper limit value of the setting range
displayed returns the value to the lower limit value.
5.
Press the MEAS switch to apply the setting.
The measurement mode is returned.
Setting range
100 ppm to 4900 ppm
30 ppm to 290 ppm
62ppm to 1900 ppm
25
Initial setting
300 ppm
30 ppm
150 ppm