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SUP-DM3000 Digital Dissolved Oxygen Meter

SUP-DM3000 Digital Dissolved Oxygen Meter

A dissolved oxygen meter measures the amount of oxygen dissolved within an aqueous solution. Oxygen is dissolved in water through the surrounding air, air movement and photosynthesis.

Comparative Advantages of Fluorescence Digital Dissolved Oxygen Sensor:

1. No oxygen consumption
This equipment does not consume oxygen, has no requirements for flow rate and agitation, and can better meet the demand for oxygen measurement.
2. High-precision probe
The equipment has higher resolution and measurement accuracy and is fast and sensitive.
3. Wide voltage power supply
The equipment adopts a wide voltage power supply, which can be 10~30V DC and can adapt to various DC power supplies on site.
4. RS485 communication interface
The equipment adopts MODBUS RTU communication protocol, which can be easily connected to the computer for monitoring and communication.
5. Temperature compensation
The device has a built-in temperature transmitter and automatic temperature compensation function, which can reduce measurement error and increase accuracy.
6. Long term maintenance free
The equipment does not need to replace the diaphragm and electrolyte, and is basically maintenance-free, with a service life of up to one year.
7. High protective housing
The equipment has a highly protective and corrosion-resistant shell, with a waterproof grade of IP68 and stronger stability; The bottom is made of 316 stainless steel, which is resistant to salt and alkali corrosion for a long time.
Installation mode of fluorescence dissolved oxygen sensor:
The equipment adopts the sinking installation method, that is, it is fixed and installed below the liquid level. During installation and use, avoid colliding or scratching the surface of the fluorescent film head, and avoid the fluorescent film head being attached to the sediment at the bottom. Remove the rubber protective sleeve when using.


The BOD test is generally used in wastewater treatment plants, where it is important to know the amount of oxygen consumed from the water by microorganisms as they break down organic matter. This test allows the water treatment plant to determine the effectiveness of the water treatment or the amount of contamination still present. The relative oxygen demand of wastewater, effluent and sewage can be determined by measuring the amount of oxygen dissolved in the sample at the beginning and end of a specific incubation period. BOD can be calculated by measuring the dissolved oxygen at time 1 (T1) and subtracting the dissolved oxygen at time 2 (T2); multiplying this value by the final sample volume (VF) and dividing by the initial sample volume (V).

BOD (mg/L) = (T1 - T2)VF/V


  Product  Digital Dissolved Oxygen Meter
  Model SUP-DM3000
  Measure Range 0-40mg/L, 0-130%
  Accuracy ±0.5%FS
 Temperature Accuracy 0.5℃
 Output Type 1 4-20mA output
 Max.loop Resistance 750Ω
 Repeatblitiy ±0.5%FS
 Output Type 2 RS485 digital signal output
 Communication Protocol Standard MODBUS-RTU(customizable)
 Power Supply

AC220V±10%, 5W Max, 50Hz

 Alarm Relay AC250V, 3A

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