Dissolved Oxygen Transmitter which generates a 4-20mA output signal proportional to the measured dissolved oxygen value

Fluorescent Optical Dissolved Oxygen Transmitter Range

Our dissolved oxygen transmitters are unique devices designed to measure the Dissolved Oxygen and then transmit a 4-20mA current signal corresponding to the dissolved oxygen range.

The 4-20mA current signal can be transmitted over a distance of up to 1000m away (or can be viewed anywhere in the world using our online data logger), and the device is powered from the same two wires that receive the signal.

Our dissolved oxygen transmitter range is unique in that the electronics are integrated into the sensor providing a neat IP68 rated submersible sensor.

Fluorescent Optical Dissolved Oxygen Sensor

The dissolved oxygen transmitters do not use either a traditional polarographic membrane type sensor or the galvanic methodology.

They do use Fluorescent Technology to provide the dissolved oxygen signal. Fluorescent technology involves transmitting a light beam of a specific wavelength which is sent to a fluorescent layer in contact with the sample. The energy within the light beam is absorbed by the fluorescent layer and then a proportion of this is released back as light. This phenomenon is called fluoresce.

If oxygen molecules are present on the fluorescent layer then the amount of light returned by the fluorescent layer is diminished. This is referred to as quenching. By measuring the amount of quenching we can very accurately determine the dissolved oxygen concentration.

Fluorescent Optical Dissolved Oxygen Vs. Polarographic Clarke Sensors

Polarographic dissolved oxygen sensors, sometimes referred to as Clarke sensors use a Silver-Silver Chloride anode and a platinum cathode arrangement combined with an oxygen permeable teflon membrane and a filling solution. Dissolved oxygen reacts with the arrangement and causes an electrochemical change which is amplified in a suitable dissolved oxygen instrument.

The oxygen is consumed when it reacts with the anode and cathode which means that they require a steady flow to provide continuously accurately measurement. Due to the methodology the accuracy of membrane dissolved oxygen sensors is reduced when low levels of dissolved oxygen are present.

The fluorescent sensor emits light across more than a single wavelength to ensure that the readings at low DO levels are very accurate as well as at higher concentrations of dissolved oxygen. In addition - the fluorescent measurement technique and monitoring of quenching does not consume the dissolved oxygen. They also do not require a steady flow to operate.

Fluorescent Optical Dissolved Oxygen

Fluorescent Optical dissolved oxygen provides precision dissolved oxygen concentration and saturation measurements with little periodic maintenance. They don't require a flow to operate, and do not consume oxygen when making the measurements.

Our range of optical fluorescent dissolved oxygen sensors are microprocessor driven with configurable parameters for pressure, salinity, and R.H. compensation.

Fluorescent Optical Dissolved Oxygen Transmitter Range


OD8325 Submersible Optical Dissolved Oxygen Transmitter

OD8325 Submersible Optical Dissolved Oxygen Transmitter

The OD8325 is a submersible dissolved oxygen transmitter designed for use in tanks, streams, pits or weirs. The OD8325 includes an autoclean nozzle for use with a suitable auto-clean system.

The OD8325 offers continous dissolved oxygen measurements with a 4-20mA output signal corresponding to either concentration dissolved oxygen with a range of 0 - 20ppm or percentage saturation of dissolved oxygen with a scale of 0 - 200%.

The OD8325 uses fluorescent technology to reduce the amount of time spent on maintenance and calibration and offers very accurate dissolved oxygen readings even when low levels of DO2 are present.

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OD8525 Inline Optical Dissolved Oxygen Transmitter

OD8525 Inline Optical Dissolved Oxygen Transmitter

The OD8525 is an inline dissovled oxygen transmitter designed to be mounted in line or in the flow of a process to deliver continuous dissolved oxygen measurements.

The OD8525 offers continous dissolved oxygen measurements with a 4-20mA output signal corresponding to either concentration dissolved oxygen with a range of 0 - 20ppm or percentage saturation of dissolved oxygen with a scale of 0 - 200%.

The OD8525 uses fluorescent technology to reduce the amount of time spent on maintenance and calibration and offers very accurate dissolved oxygen readings even when low levels of DO2 are present.

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