Replacement Intervals
Unlike membrane sensors, optical sensors:
Do not have electrolyte to refill
Do not require membrane replacement
However, they may have:
Optical sensing cap (luminophore coating)
Lifetime: 1–2 years typical
Depends on:
Ozone concentration levels
UV exposure
Fouling
Temperature
Gradual signal weakening indicates aging
O-rings / seals
Replace during maintenance if worn
Calibration Interval
Optical dissolved ozone sensors (luminescent / fluorescence-based) drift much less than electrochemical or membrane types, but they still require periodic calibration.
Typical calibration frequency:
Every 3–6 months in clean water
Every 1–3 months in wastewater or dirty process water
Immediately after:
Harsh cleaning
Sensor storage
Suspected drift
Replacement of optical cap (if applicable)
Most systems support:
One-point calibration (against known ozone concentration)
Two-point calibration (zero + known standard)
Zero calibration is often done with ozone-free water (e.g., sodium sulfite treated).
Cleaning Interval
More important than calibration in many cases.
Cleaning frequency:
Clean water: every 1–3 months
Wastewater: every 2–4 weeks
Heavy fouling: as needed
Use:
Soft cloth
Mild acid cleaning (if scale)
Avoid abrasive materials (damages optical surface)
Supmea
LH-DZ900
Measures dissolved ozone in water up to 20 mg/L
Item | Specification |
|---|---|
Ozone Measuring range | 0.00 mg/L ~ 20.00 mg/L |
Ozone Resolution | 0.01 mg/L |
Ozone Accuracy | 5% FS |
Temperature Measuring range | -10.0 ~ 110.0 ℃ |
Temperature Resolution | 0.1 ℃ |
Temperature Accuracy | ± 0.5 ℃ |
Temperature type | Thermistor |
Temperature compensation | Manual / Auto |
RS485 output | MODBUS-RTU protocol |
Power supply | 9 ~ 27 VDC |
Isolation strength | 2500 Vrms |
Power | About 0.5 W |
Material | POM shell |
Installation | PG13.5 / 20×1.5 Thread |