Issues With Conductivity Controllers; Probe Cleaning And Calibration; Bleed Set Point; Dead Band Control - EcoWater CHC Series Service And Troubleshooting Manual

5.6

Issues with Conductivity Controllers-

CHC systems have utilized may brands of conductivity meters. The gray Walchem units, the yellow
LMI units and most recently the CHC Control Stations. Each conductivity meter utilizes a temperature
compensated probe as well as controls the Blow down Valve through the use of an on-board relay
(bleed NO). The following information reflects each model:

5.6.1 Probe Cleaning and Calibration-

Always verify that the probe is clean first, do not just look and decide it is clean, always clean it with a
Rydlyme like product. Some scale on the tip may be clear, and so you will not be able to see it. If
there is any exposed metal on the probe tip, replace the probe. Always refer to the manual or
Conductivity Reference found within this manual before you clean a probe. Some probes can only be
cleaned in one direction.

5.6.2 Bleed Set Point-

The Bleed Set Point has been chosen ahead of time and will not reflect the current COC. This set point
has been chosen against the worst case water analysis given for that customer. DO NOT adjust it each
time to control the COC. If water quality is better this month, than the COC will increase, if it is worse
than the original bleed set point chosen the COCs may decline, however this set point was chosen to
ensure that the system does not scale up, so Adjustments to the set point must be cleared with
EcoWater CHC Service Personnel.

5.6.3 Dead Band Control-

The Dead Band should be adjusted to achieve 10% difference from the Bleed Set Point. If the Bleed
Set Point is 2000, then the Dead Band should be 200, however if the Bleed Set Point is 500 then a Dead
Band of 50 will suffice.
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