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.
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