Campbell OXYGUARD TYPE III CS512 Manual de usuario descargar pdf (Pagina 9)

Campbell Scientific CS512 Oxyguard

Type III Dissolved Oxygen Sensor

An accurate and reliable sensor is a critical element in any measurement system. The

Oxyguard Stationary Sensor meets these criteria for the measurement of dissolved oxygen.

1. General Information

The Oxyguard Stationary Sensor is a galvanic sensor which produces a millivolt

signal proportional to the amount of oxygen present in the measured medium.

Oxygen diffuses through the membrane onto the cathode, reacts chemically, and

combines with the anode. An electrical current is produced by this chemical reaction

which is converted from microamps to millivolts by an in-line resistor. An in-line

thermistor also conditions the signal providing automatic temperature compensation.

With these features, the sensor produces a millivolt output proportional to the oxygen

present in the medium in which it is placed. The sensor consists of two parts, an

upper part with cathode, anode and cable, and a lower part comprising a screw on

membrane cap with fitted membrane. The cap is filled with electrolyte and simply

screwed onto the top component.

The sensor is self-polarizing and requires no external power source. There are two

wires to connect.

Because the sensor's output is linear, it is possible to connect it directly to a data

acquisition system capable of handling the small millivolt signal.

The sensor's robust construction and simple design make maintenance and servicing it

straightforward. There is no need to send the sensor back to the factory for servicing.

It utilizes a strong, easy-to-clean and easy-to-change membrane in a screw-on

membrane cap. Regular servicing is not required. When necessary the sensor can be

fully overhauled in five minutes.

Figure 1-1. CS512

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Campbell OXYGUARD TYPE III CS512 Manual de usuario Pagina 9