Xi'an Kacise Optronics Co.,Ltd.
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The Yokogawa SMART optical dissolved oxygen sensors DO71 and DO72 have a high degree of durability and stability and require limited maintenance.
Key features of the smart optical DO sensors are fast response time, no warm-up time, and exceptional long-term stability. Qualities that support a high degree of process and cost optimization.
Because of their flat sensor surface and stainless-steel body, the DO71 and DO72 SMART sensors are robust and easy to clean. They are suitable for measurements ranging from low ppb levels to saturated oxygen levels in the water. Ideal for W&WW applications or industrial oxygen monitoring when the sensor needs to be able to withstand challenging measurement environments.
The DO71 and DO72 are digital dissolved oxygen SMART sensors with RS-485-based communication. This feature enables easy calibration in the field, workshop, or laboratory when using the FREE commissioning software "SENCOM ct”.
The sensors' smart functionality enables communication with any other Modbus HOST, such as a PLC, data acquisition system, or other intelligent device, in addition to the Yokogawa FLXA402 analyzer series.
The DO71/DO72 use a fluorescence phase-shift method, which is less susceptible to contamination than the fluorescence intensity method and allows more accurate measurement.
Maintenance is done only by replacing the sensor cap at the tip, and it can be easily replaced without using any tools.
Because of no electrolyte, it can be used continuously for a long time without maintenance.
DO71 and DO72-W for 0 to 22.5 mg/L can be used for wide range applications such as waste water treatment and process control, and DO72-T for 0 to 2 mg/L can be used for low concentration applications such as SWAS. In addition, a variety of cleaning options are available and it is suitable for difficult applications and for strict water quality control.
The 4-wire liquid analyzer FLXA402 can connect a pH sensor, conductivity sensor, galvanic or polarographic method dissolved oxygen sensor to the second module of FLXA. You can easily customize analyzer according to your process requirements.
With a 90% response time of less than 90 seconds, it can quickly follow the oxygen concentration change of the process.
| Parameter | DO71 |
| Sensor type | Optical Dissolved oxygen sensor |
| Measuring range | 0 to 22.5 mg/L O₂ |
| Accuracy | ± 0.05 mg/L + 1% of reading |
| Repeatability | ± 0.05 mg/L + 0.5% of reading |
| Temperature accuracy | ≤ 1.0 °C |
| Operating temperature | 0 to 50 °C |
| Mechanical pressure | 0 to 3 Bar(g) (overpressure); 0 to 0.999 Barg (underpressure) |
| Response time t90 | ≤ 90 sec |
| Insertion lengths | 106 mm |
| Area classification | General purpose |
| Connection type | Permanent cable with 3, 5, 10 or 20m length |
| Parameter | DO72-W |
| Sensor type | Wide measuring range optical dissolved oxygen sensor |
| Measuring range | 0 – 22.5 mg/L O₂ |
| Accuracy | ± 0.05 mg/L + 1% of reading |
| Repeatability | ± 0.05 mg/L + 0.5% of reading |
| Temperature accuracy | ≤ 1.0 °C |
| Insertion lengths | 120 mm |
| Area classification | General purpose |
| Connection type | VariPin connector |
| Operating temperature | 0 °C to +50 °C |
| Pressure | 0-12 Barg (overpressure); 0-0.990 Barg (underpressure) |
| Response time t90 | ≤ 120 sec |
| Parameter | DO72-T |
| Sensor type | Trace measuring range optical dissolved oxygen sensor |
| Measuring range | 0 – 2 mg/L O₂ |
| Accuracy | ± 3 ppb + 3% of reading |
| Repeatability | ± 3 ppb + 3% of reading |
| Temperature accuracy | ≤ 1.0 °C |
| Insertion lengths | 120 mm |
| Area classification | General purpose |
| Connection type | VariPin connector |
| Operating temperature | 0 °C to +50 °C |
| Pressure | 0-12 Barg (overpressure); 0-0.990 Barg (underpressure) |
| Response time t90 | ≤ 120 sec |