BOD5 Measurements are internationally standardised, and the method is widely used in laboratories.  Due to the long incubation times required to perform this classic method, using BOD5 for timely control and monitoring of waste water, is not practical. 

With our LAR BioMonitor Analyser system, it will detect rapid changes in oxygen demand and with a response time of 3 - 4 minutes.  This Analyser system rapidly measure the total BOD including the oxygen demand for the nitrification as well as the activated sludge respiration (ASR). 

Measurement Principle Explained:

Biomonitor Method

1) Measurement results are displayed on the Analyser screen (human interface). 

2) The aerated mixture of activated sludge and sample is pumped through the four reactors.  The O2 sensor determines the oxygen consumed during decomposition. 

3) The activated sludge is aerated and its respiration is determined (ASR). 



  • Measurement Range: BOD: 1 - 50 mg/L ; 1 - 200 000 mg/L and ASR: 0 - 5 mg/L/min
  • Method: Continuous 2 stream respiration measurement
  • Response Time: 3 - 4 minutes
  • Individually programmable user levels
  • Serial Interface: RS232
  • Analog Output: 0/4 - 20mA
  • Remote Control: Through TCP/IP Protocol
  • High resolution and back lit TFT touchscreen graphic display