Chemitec 423C OPT Dissolved Oxygen SensorOptical Dissolved Oxygen Sensor

Model 423/C/OPT

Low-maintenance D.O. for Aeration Control in Wastewater Treatment

Chemitec's Model S423C OPT Optical Dissolved Oxygen & Temperature probe uses optical luminescence to provide accurate Dissolved Oxygen measurement in a durable, low-maintenance design. Features selectable measuring ranges and sixty-second response time for rapid control of blowers in aeration basins. Available in stainless steel (Model S423 C OPT) or PVC (Model S423 C OPT PVC). The Model 423 provides plug-and-play ease of use, is factory pre-calibrated, and is compatible with the Chemitec Series 50 Digital Controller.

423C OPT Dissolved Oxygen Probe


The S423/C/OPT is a dissolved oxygen measuring sensor with integrated temperature probe.
The measuring technique is based on an optical fluorescent principle:
A diode emits a blue light towards a fluorescent substrate. The substrate reacts by emitting initially a red light (luminescence). Oxygen quenches the substrate, which then returns to its initial state. The intensity of the produced red light and the quench rate to the initial state correlate to the oxygen concentration. This innovative method allows reliable, accurate measurements with no drift over time, so that the system calibration is no longer necessary. No maintenance is required except for the replacement of the luminescent support about every two years. The system does not consume oxygen, therefore it is suitable for the most varied fields of application, including those in which the measuring liquid is almost stationary.

The 423C/OPT is compatible with the Series 50 Digital Controller


Optical Oxygen and Temperature Probe

Measuring Range 0.00 to 20.00 mg/L (0 to 200%)
Measuring method Optical measure by luminescence
Precision ±0.1mg/L or ±1%
Response 90% of the value in less than 60 second
Refresh Time Less than 1 second
Temperature Compensation with internal NTC probe
Operating temperature -10 ÷ 60°C (optional -10÷ 80°C)
Maximum Pressure 5 bar
Maximum pressure 1 bar
Body material AISI 316 (PVC body optional)
Electrode Material Special optical glasses
O-ring NBR and Silicon
Mechanical Protection IP68 Sensor + Cable
Mechanical protection IP68 Sensor+cable
Power supply 12 ÷ 24Vdc
Power Consumption Max. 2W
Cable 10m integral with the sensor (other on request)
Signal Interface RS 485 Modbus RTU Protocol


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