Omega Engineering CDE-45P - Manual (Page 4)

Omega CDE-45P
Conductivity Sensor Part 1– Introduction
O&M Manual
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Part 1 - Introduction
1.1 General
The Model CDE-45P Conductivity Sensor measures the
conductivity of aqueous solutions in industrial and municipal
process applications. It is designed to perform in the
harshest of environments. All seals are dual o-ring using
multiple sealing materials. The sensor is designed for use
with the Omega CDTX-45 Monitor/Analyzer.
1.2
Sensor Features
• 4-Electrode measurement system. Two of the
electrodes are used to establish the sensor drive
potential, while the other two sense the flow of current
between the drive electrodes and maintain proper
drive potential. In conventional 2-electrode sensors,
as the process solution coats the electrode surfaces,
the sensor output signal begins to decrease,
producing an artificially low conductivity
measurement. The Omega 4-Electrode system thus
offers a high degree of accuracy for a longer period of
time. The four electrodes are made of titanium for
greater chemical resistance.
• The Omega 4-Electrode system compensates for the
Effects of electrode fouling. As the electrodes
become coated by the process solution, a feedback
Mechanism detects the decrease in drive potential
and automatically re-establishes the proper levels.
When coating is such that compensation is no longer
possible, and alarm signals the user that the sensor
requires cleaning. The system also alerts the user in
the event of integral temperature element failure.
• The Omega 4-Electrode system allows a single
Sensor configuration to be used reliably over a wide
Conductivity range. There is no need for multiple
sensors with varying cell constants that are restricted
to narrow operating ranges.
• Pt1000 RTD. The temperature element used in this
Sensor is highly accurate and provides a highly linear
output.