MIK-DM2800 Membrane dissolved oxygen meter

The MIK-DM2800 is an online dissolved oxygen (DO) meter for membrane-type (polarographic) DO sensors. It uses a liquid crystal display to show DO and medium temperature, and provides 4–20 mA, RS485 and relay outputs with control functions.

Oxygen from the water diffuses through a gas-permeable membrane into the sensor, where it is reduced at the cathode. The resulting current is proportional to the oxygen partial pressure, which the meter converts into a DO value. Because oxygen solubility depends on temperature, pressure and salinity, these factors affect the reading.

• Dissolved oxygen: 0–20 mg/L
• Saturation: 0–200%
• Oxygen partial pressure: 0–400 hPa
• Temperature: -10 to 60 °C

• Resolution: 0.01 mg/L, 0.1%, 1 hPa; temperature 0.1 °C
• Accuracy: ±1.5% FS
• Repeatability: ±0.5% FS
• Temperature correction accuracy: ±0.5 °C

The meter supports NTC10K or PT1000 temperature sensors, with automatic or manual temperature compensation from -10 to 60 °C.

Oxygen solubility depends on salinity and pressure as well as temperature. Please tell us your water salinity and site altitude so we can confirm the compensation settings for your application.

• Analog output: 4–20 mA, maximum loop resistance 750 Ω
• Digital output: RS485, standard Modbus-RTU (customizable)
• Alarm relay: AC 250 V, 3 A

Yes. The alarm relay can switch a blower or aerator at set points, and the 4–20 mA output can be used by a PLC or VFD for continuous aeration control, which helps save energy in wastewater treatment.

AC 220 V ±10%, 50/60 Hz, 5 W max.

• Dimensions: 100 × 100 × 150 mm (H × W × D)
• Weight: 0.65 kg
• Ingress protection: IP54

• Operating temperature: 0–60 °C
• Relative humidity: 10%–85% RH
• Storage: 15–65 °C, 5%–95% RH

The MIK-DM2800 is designed for membrane-type DO sensors, such as the MIK-DO7011 membrane dissolved oxygen sensor. Please confirm sensor compatibility with us before ordering.

A membrane (polarographic) system is a proven, cost-effective technology, but requires periodic membrane and electrolyte maintenance and a minimum water flow at the membrane. An optical system such as the MIK-DO700 consumes no oxygen, has no flow requirement and needs less maintenance.

• Clean the membrane regularly and replace the membrane and electrolyte as needed.
• Allow a polarization period after installation or maintenance before taking readings.
• Recalibrate after maintenance, for example in air or a zero-oxygen solution.
• Make sure there is sufficient water movement across the membrane.

DO systems are generally calibrated in water-saturated air (100% saturation) and, if required, in a zero-oxygen solution. Please follow the calibration procedure in the manual.

Typical applications include aeration tanks and effluent monitoring in wastewater treatment, water plants, aquaculture and industrial water.

To help us select the correct configuration, please provide:

• Application and installation point
• DO range, water temperature and salinity
• Whether a sensor is required
• Output and relay requirements
• Installation environment
• Quantity

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