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Ionix DO50 Handheld DO Meter with Data Logging

Quick Overview

Advanced fluorescence based optical sensor:

  • Memory, 500 data points with time & date

  • Automatic Salinity compensation 

  • USB data output

  • Realtime clock, Timing store

  • No oxygen consumption, stable display in both static water and dynamic water

  • Simple to use, No need to warm-up or frequently calibrate

  • Maintenance free, No electrode membranes or electrolyte, service life of fluoresence cap >8000 hours

  • Oxygen cap head has lightproof coating and is not affected by light and chemicals

  • Equipped with electrode calibration sheath, for easy storage and calibration

Availability: In Stock.




Measuring Range 0-200%; 0-20.0mg/L
Resolution 0.1%, 0.01mg/L (ppm)
Accuracy ±0.1 mg/L (0~8mg/L); ±0.2 mg/L (8~20mg/L)
Calibration Point Zero oxygen & oxygen saturation
Temp. Compensation Automatic
Air-pressure Compensation Automatic
Salinity Compensation Manual or Automatic
Measuring Range 0 ~ 50.0℃
Resolution 0.1 ℃
Data Logging 500 Points (with time & date)
Accuracy ±0.5℃
Reading Stability Display Yes
Auto lock on Yes
Display Backlit LCD
IP Rating IP57
Signal Output USB
Power AA Batteries x 3  
Battery life > 200 hours

Kit Contents

  • DO50 Meter
  • DO electrode (3m)
  • Salinity Electrode (3m)
  • Combination probe cap
  • USB Cable & CD & Carry Case

The main reasons why an Optical DO sensor is a better choice for measuring dissolved oxygen

  • Stability, sensitivity, speed of response, accuracy in low DO conditions and minimal maintenance requirements.
  • Oxygen is not consumed as part of an electrochemical reaction and optical sensors do not require sample flow or stirring for accurate readings.
  • Results demonstrated excellent correlation between the optical sensor and the Winkler titration method.
  • Optical sensors respond faster than membrane-based sensors to changing temperature and DO
  • Readings are stable and drift is minimal over long-term deployments.
  • Durable sensing element offers a longer operational life than an oxygen-permeable membrane.
  • Maintenance and calibration requirements are drastically reduced, minimizing site visits and operational costs.
  • Material costs are reduced. Clark-cell sensors require frequent replacement of membranes and filling solution. The optical sensor Cap is replaced annually. 

Additional Information

Part Number ST-DO50