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causes the alarm to turn off at a value that is less than the alarm value. For a
low alarm, hysterisis causes the alarm to turn off at a value greater than the
alarm value.
4.3.2 Calibration
Calibration Intervals
The CDTX-111 Monitor and Sensor combination once calibrated will require
calibration checking/recalibration at 3-6 monthly intervals, however this does
depend on the application. The calibration of the instrument can be effected
by seasonal variations in the measured effluent, however only knowledge of
the application can determine the re-calibration interval required.
4.3.2.1 CAL—conductivity sensor manual calibration
Preparing For Calibration
Value known conductivity buffer 100ml;
Pure water 300~500ml;
Use pure water to wash the sensor, and then make it dry;
Use thermometer to measure the temperature of buffer;
Select manual temperature compensation in the instrument menu and
input the temperature value of buffer, set the temperature
compensation
coefficient is 0.
Figure 6 alarm with hysterisis
