Online BOD Water Analyzer

Vasthi Instruments are global leaders in manufacturing of Online BOD Water Analyzer and have been supplying instruments to customers worldwide, Our multidisciplinary team of scientists, physicians, engineers, and regulatory consultants with decades of global experience brings you the quintessential mechanism that provides complete safety accuracy and durability. Vasthi Instruments was formed with visionary thinking and innovative ideas resulting in innovative products and solutions. We enhance our product quality by the continuous process of research and development. We have WIDE range of models to suite various site conditions and processes.



Online BOD Water Analyzer is a new type of automatic on-line analyzer for measuring bio-chemical oxygen demand (BOD) of sewage. The Online BOD Water Analyzer uses the latest photoelectric measurement, high temperature and high pressure digestion, digestion and color integration technology, with measurement accuracy, low detection limit, high reliability, strong adaptability and so on. It is in line with national ring Protection Agency released chromium standard test method to obtain a measurement certificate relevant state departments. Reagent used by the instrument can by relevant national standard quasi-self-preparation.

Online BOD Water Analyzer can be widely used in water pollution detection / industrial production process water / industrial and municipal waste water treatment and other fields.


  • It Requires no reagents, so it can save operating costs and will cause no secondary pollution .
  • The Response is quick (about 2 seconds ). It is suitable for the occasion where high real time performance is required , such as industrial process analysis .
  • Free from the interference of chloride ion .
  • It Adopts full-spectrum measurement and chemo metric algorithm analysis ,Which in comparison with the simple dual wave length background subtraction technology, can measure more parameters and is less likely to be influenced by the compositional change of waste water.
  • All Components are independently researched and developed
  • It adopts pulse blowing method to clean the pollutants on the two window surfaces. The Instrument probe in the water measures organics in the water by means of xenon lamp . The calculation of the spectrum obtained after each measurement will produce a measured value, which will be transmitted to the control box and displayed.
  • Optical Fiber on the main Interface . One measurement only takes several dozens of seconds . Mean While ,in the interval of measurement , the instrument will be automatically cleaned to prevent contaminants from being deposited on the surface of the lens .



Measuring Parameters



Measuring Rang

As Customer required


Uv/Visible differential optical absorption spectroscopy, wavelength range   200-800nm


230V  AC, 30w



Zero Gravity


Range (COD)

0~50~200mg/l,greater range can be customized


The shortest 60 seconds, the cycle can be set

Probes Depth


Optical Path

Can be adjusted according to the site condition

Working Temp


Enclosure Rating

Ip65(secondary instrument)

Auto -Cleaning



RS232/RS485(Baud rate can be set),2×4-20ma output

Probe Size


Probe Weight


Interace digital

Ethernet (TCP/IP),RS-232 or RS-485 (Modbus RTU)

Power Supply

12-24VDC (±10%)

Output Data


Power Consumption

Power Consumption

Environmental Conditions


Sample Temperature


Ambient Temperature


Inflow velocity


Performance Characteristics


Maintence effort

Typically <0.5h/month

Calibration/maintenance interval

24 months

System compatibility

Modbus RTU


1 year (EU:2year)



Max. pressure with sub Conn

30 bar

Max. Pressure with fixed cable

3 bar

Max .pressure in flow cell

1 ber,2-4 L/min

Protection type

IP 68

Structural design


Housing material

Stainless steel (1.4571/1.4404)or titanium(3.7035)

Weight Stainless steel

~3kg (with 10mm path)

Weight titanium

~2kg (with 10mm path)