Emec Centurio PRO - Centurio PRO Standard Settings; Calibration Procedures

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“Centurio PRO” standard settings.
Standard settings are: Probes calibration and operating modes (bleed - inhibitor - biocide). To calibrate each channel
select it within main menu. Channels availability is based on modules conguration. The controller will automatically add
the proper channel when a new module is installed and detected.
Conductivity calibration menu.
This menu includes probe choice, conductivity calibration , temperature compensation and manual or automatic temperature
compensation. Conductivity calibration procedure involves a zero calibration (First Point) and a 2nd calibration point (Second
Point) that requires a buffer solution with value near working range. Furthermore Temperature and Automatic Compensation
must be set. Note: This procedure assumes that CONTROLLER is correctly installed and congured, connected
to a working probe. Calibrate using plant’s temperature otherwise unattended results might occur. If something
wrong occurs use RECOVERY CALIBRATION to restore to previous calibration.
First Point & Second Point.
During this procedure probe must be dry and clean and not installed in plant. Tap on “First Point” (zero) and conrm it.
Tap on “Second point”, dip probe’s head into buffer solution and wait until reading value is stable, enter buffer solution
value and conrm it.
Temperature Compensation (if available)
Conductivity measurements are temperature dependent. The degree to which temperature affects conductivity varies
from solution to solution and can be calculated using the following formula: C25 = C / {1+[a/100(t-25)]} where: C25 =
slution conductivity at 25°C, C = conductivity at operating temperature, a = temperature coefcient of solution %/°C.
Probe read value
(uS or ppm)
Alpha
(a)
Temperature
(°C / °F)
Displayed Value
(us or ppm)
5227 1.2 35°C / 95°F 4934
4524 3.5 27°C / 80.6°F 4228
3924 2.1 40°C / 104°F 2984
Samples alphas (a) are listed in the table above. To determine that “a” of other solutions, simply measure conductivity at
a range of temperatures and graphic the change in conductivity versus the change in temperature. “Centurio PRO” has
either xed or adjustable automatic temperature compensation referenced to a standard temperature of 25°C.
Otherwise choose automatic temperature compensation and set % Alpha value.