See the light by using precise low maintenance SMART optical
dissolved oxygen technology
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.
Features
Easy to clean and long-time stability for a long time
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.
Excellent maintainability
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.
Supports a wide range of measurement environments
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.
Simple measurement system and easy installation
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.
Control delicate process measurement processes
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 |
