CheckPoint Pharma and CheckPoint
e
Operation and Maintenance Manual
SUEZ © 2018
82 of 112
DLM 97200-03 EN Rev. A
Performing a Manual Autozero
When the autozero is performed manually, the lamp is turned back on after the autozero is
completed. If analysis is immediately started, the first few measurements may drift as the temperature
inside the Sensor warms up.
1. If the Sensor is taking measurements, press the
button.
2. Press the
button.
3. Press
F1
to select the Mode screen.
4. Press
F1
to select Calibration.
5. Press
F1
to select TOC
6. Press
F2
to select Autozero
7. Press
F2
to select Run Autozero. The Sensor will record conductivity measurements from both
cells with the UV lamp off. Once stable readings are obtained, the offset for Cell 2 is adjusted to
match Cell 1 and the new offset is verified by repeating the conductivity measurements with the
lamp off.
A message is displayed upon completion of the autozero. If stable conductivity readings were not
observed during the calibration, the calibration will be stopped and a warning message displayed.
Scheduling an Autozero
1. Press the
button.
2. Press
F1
to select the Mode screen.
3. Press
F1
to select Calibration.
4. Press
F1
to select TOC
5. Press
F2
to select Autozero
6. Press
F1
to select Set Schedule. Enable Autozero if it is disabled. Then, set the Interval
(1-7 days) and the time.
7. The date and time for the next scheduled autozero will be displayed. When the CheckPoint is first
installed, daily Autozeros are recommended. After a few weeks, the interval can be increased
(such as, once a week). The frequency should be set back to daily if the Sensor is moved to a
different water system or if the composition of the water system changes.
