840 Dissolved Oxygen Transmitter

The 840 Transmitter has been designed to provide accurate, highly reliable measurements in difficult highly fouling applications. The specifically designed sensor utilises a rugged, 100 micron membrane, in combination with a unique electrolyte to provide excellent long term stability, without the need for sensor replenishment or replacement.

The result is amazing - the 840 is so stable that it can measure accurately for years with practically no attention. Service intervals of five years have been reported! Maintenance is as simple as wiping the membrane clean and checking the calibration from time to time. If it should ever be necessary to replace the membrane, this can be done quickly, easily and at very little cost.

When combined with the EasyCal calibration is carried out in 2 minutes with the probe in water. As the sensor does not need to acclimatise in air, errors do not occur by hurried calibrations. As with all aspects of the 840 Transmitter the calibration routine is extremely simple and involves no tables or complicated software features.

To make installation as easy as possible and to help achieve the best possible results we recommend using the Pioneer Probe holder. This places the sensor approximately 300 mm below the surface away from the surface effects of rain, sunshine and fouling. The flexible joint in the mounting shaft allows the sensor to move, providing an anti-fouling and anti-ragging action.

Applications

• Activated Sludge Plant
  

• River Monitoring
  

• Aquaculture
  

Features

• Long Sensor Life
  

• Low Maintenance
  

• Easy to use
  

Physical

Electrical

Environmental Data

Measurement Principle

Measurement Characteristics

User Interface