Gravity: Analog Dissolved Oxygen Sensor / Meter Kit For Arduino (Pre-Order)

Measure dissolved oxygen in water for aquaculture, environmental monitoring, natural science projects and general water-quality work. This DFRobot Gravity kit pairs a galvanic dissolved oxygen probe with an analogue signal converter board for easy use with Arduino and other microcontrollers that have an ADC input.

The galvanic probe does not need a polarisation warm-up time, so it is ready to use when prepared. The probe uses a replaceable membrane cap and filling solution to help keep maintenance costs down, while the converter board provides a plug-and-play Gravity analogue interface.

Open-source code and a detailed tutorial are provided by DFRobot to help you build your own dissolved oxygen detector. Please note that the filling solution is not included due to air transport restrictions; the sensor cannot operate without 0.5 mol/L NaOH filling solution in the membrane cap, and appropriate gloves and care should be used when handling it.

Features:

• Dissolved Oxygen Probe: Galvanic probe, no need polarization time
• Dissolved Oxygen Probe: Filling solution and membrane cap is replaceable, low maintenance cost
• Signal Converter Board: 3.3~5.5V wide-range power supply, compatible with most Arduino microcontroller
• Signal Converter Board: 0~3.0V analog output, compatible with all microcontrollers with ADC function.
• Signal Converter Board: Gravity interface, plug and play, easy to use

Specifications:

• Type: Galvanic Probe
• Detection Range: 0~20mg/L
• Response Time: Up to 98% full response, within 90 seconds (25℃)
• Pressure Range: 0~50PSI
• Electrode Service Life: 1 year (normal use)
• Membrane Cap Replacement Period: 1~2 months (in muddy water); 4~5 months (in clean water)
• Filling Solution Replacement Period: Once every month
• Cable Length: 2 meters
• Probe Connector: BNC
• Operating Voltage: 3.3~5.5V
• Output Signal: 0~3.0V
• Cable Connector: BNC
• Signal Connector: Gravity Analog Interface (PH2.0-3P)
• Dimension: 42mm * 32mm

During measurement, gently stir the water so oxygen is evenly distributed. Avoid touching the oxygen-permeable membrane with fingernails or sharp objects, as it is sensitive and fragile.