B&C Electronics OD 8525

This submersible DO probe provides a 4-20 mA current loop or a RS485 and Modbus (function 03) outputs.
It is equipped with an optical DO sensing element and an internal Pt1000 temperature compensator.

The configuration of the scale, the pressure, the relative humidity, the salinity and the calibration is performed in the digital mode through the hyperteminal of the PC.

The autoclean of the sensing element is performed by the injection of clean air pressure, provided by the user.

The measuring is provided in ppm or % of air with automatic temperature compensation. Through commands from the Personal Computer hyperterminal, the serial interface allows the d.oxygen and temperature data transmission, the ppm or % of air scale selection, the configuration of pressure, salinity and R.H compensation, the zero and sensitivity calibration. Thanks to its 4/20 mA isolated output, the probe can be directly connected to a PLC or data logger. The probe can be connected to B&C Electronics controller BC 7335, BC 7635, BC 7635.010, BC 7687 or BC 6587, which provide the power, the measuring readout, 2 set-points, alarm relay and the holding function for an external cleaning cycle. The most common applications of this probe include: water quality monitoring, municipal and industrial water treatment and aquaculture.
FeaturesTechnical DataApplications

These unique probes have been designed to measure
dissolved oxygen based on fluorescent technology.
The probes are available for submersible and in-pipe installations.

The measuring system consists of:
• optical device complete of fluorescent material,
• d.oxygen and temperature measuring circuit,
• 2-wire 4/20 mA analog output,
• RS 485 digital output,
• nozzle for the autoclean by external pressure air (OD 8325).

Scale 0/20 ppm – 0/200 % air
Sensitivity ± 0,5 % of the scale
Response time 95% in < 60 seconds
Power supply 9/36 Vdc
Analog output 4/20 mA isolated current Loop
Load 600 Ω max. at 24 Vdc
Digital output RS 485
Temperature compensation automatic
Secondary parameters pressure, salinity, RH
Room temperature -5/50 °C
Max. pressure 1 bar at 25 °C (OD 8325); 6 bar at 25 °C
Autoclean by pressure air 3 bar max
Dimensions OD 8325

Dimensions OD 8525

L=165 mm total, D= 60 mm

L=143 mm total, D= 40 mm

Body PVC
Cable 10 m (100 m max.)
Protection IP 68
  • Aquaculture
  • Water treatment