CheckPoint Pharma and CheckPoint
e
Operation and Maintenance Manual
SUEZ © 2018
83 of 112
DLM 97200-03 EN Rev. A
Conductivity Match
The conductivity match is an adjustment of the offsets for both conductivity cells to match the
conductivity/resistivity of a reference meter. To perform this calibration, we recommended that the
CheckPoint be installed and operated on the water system equipped with a reference
conductivity/resistivity meter for at least 24 hours.
1. Press the
button.
2. Press
F1
to select the Mode screen.
3. Press
F1
to select Calibration.
4. Press
F2
to select Conductivity.
5. Press
F3
to select Conductivity Match.
6. Record the average Conductivity/resistivity values from the reference meter and enter this value
in the TOC match screen.
7. Press
F1
to accept the new offsets.
It may be necessary repeat the conductivity match periodically.
TOC Match
The TOC calibration described previously is a high level adjustment of the TOC gain. For low-level
TOC measurements (< 5 ppb) a more critical calibration is the TOC offset or TOC match. For this
calibration, CheckPoint Sensor is installed on a water system along with a reference analyzer. After
stable TOC measurements are obtained from both the Sensor and the reference analyzer, an offset is
applied to Sensor’s TOC measurements to match the reference analyzer. To perform this calibration,
we recommend that the Sensor be installed and operated on the water system for at least 24 hours
and that a TOC autozero be either scheduled or performed manually. After the autozero, allow the
CheckPoint to operate for 2-3 hours prior to performing the match.
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
F3
to select TOC Match.
