Campbell OXYGUARD TYPE III CS512 User Manual download pdf (Page 5)

Campbell Scientific CS512 Oxyguard

Type III Dissolved Oxygen Probe

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

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

1. General Information

The Oxyguard Stationary Probe is a galvanic probe 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 probe produces a millivolt output

proportional to the oxygen present in the medium in which it is placed. The probe

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

wires to connect.

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

acquisition system capable of handling the small millivolt signal.

The probe's robust construction and simple design make maintenance and

servicing it straightforward. There is no need to send the probe 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

probe can be fully overhauled in five minutes.

FIGURE 1-1. CS512

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Campbell OXYGUARD TYPE III CS512 User Manual Page 5