MIK-DO7018 Optical dissolved oxygen sensor

The MIK-DO7018 is a digital fluorescent dissolved oxygen (DO) sensor with a titanium body, based on fluorescence lifetime technology and self-developed fluorescent materials. It has a built-in temperature sensor with automatic compensation and a Modbus RS-485 output, so it can be networked without a separate controller.

A fluorescent material on the sensor cap is excited by light and then emits fluorescence. Oxygen molecules shorten the fluorescence lifetime, so the sensor calculates the DO concentration by measuring this lifetime, which provides stable long-term measurement.

• No oxygen consumption and no flow rate limitation
• No membrane and no electrolyte required
• No hydrogen sulfide interference
• Excellent stability and ±1% accuracy
• Fast 10-second response
• Built-in temperature sensor with automatic compensation
• RS-485 output for direct networking

• Dissolved oxygen: 0–20 mg/L or 0–200% saturation
• Temperature: 0–50 °C

• DO accuracy: ±1%
• Temperature accuracy: ±0.2 °C

The response time is 10 seconds.

The sensor operates on 6–24 VDC ±5% with a current consumption below 50 mA, which suits low-voltage and battery- or solar-powered monitoring systems.

It provides Modbus RS-485 communication for direct connection to a PLC, data logger, SCADA system or IoT gateway. Please contact us for the communication settings and register map.

The maximum water depth is 10 m.

The body is made of titanium (grade 2). Titanium offers excellent corrosion resistance, which makes the sensor suitable for demanding water such as seawater and aggressive wastewater.

• Process connection: 3/4" NPT
• Ingress protection: IP68

A 10 m cable is standard, and 5 m, 15 m and 30 m cables are optional.

The fluorescence lifetime design greatly reduces calibration needs. When required, one-point and two-point calibrations are supported. Periodic checks against a reference are recommended.

The fluorescent cap lasts about one year under normal use. No membrane or electrolyte replacement is needed; routine maintenance consists of cleaning the cap and replacing it about once a year.

• MIK-DO7018: accuracy ±1%; response 10 s; titanium body; 3/4" NPT; 6–24 VDC; temperature accuracy ±0.2 °C.
• MIK-DO7019: accuracy ±3% FS; response 60 s; SS316L/titanium alloy/POM; M22×1.5 thread; 9–24 VDC; temperature accuracy ±0.5 °C.

It can be networked directly with any Modbus RS-485 master. For local display and relay outputs, it can be used with the MIK-DC2000 controller for Asmik digital sensors; please confirm compatibility with us.

Typical applications include aquaculture, wastewater treatment, environmental water monitoring and seawater applications, where accurate DO data is essential for water quality and the safety of aquatic life.

To help us select the correct configuration, please provide:

• Application and water type (fresh water, wastewater, seawater)
• DO range, water temperature and installation depth
• Cable length (5, 10, 15 or 30 m)
• Available power supply
• Host system (PLC, IoT gateway or Asmik controller)
• Quantity

Send your requirements to info@asmik.com or contact us via WhatsApp at +86 13325716921.