Online Escherichia coli automatic monitoring instrumentThe culture medium used in this system can generate colored compounds with the specific enzyme for continuous spectrophotometric determination. Based on the color change of the water sample to be tested and its relationship with the number of coliform bacteria in the water, relevant mathematical models can be established to obtain the concentration of coliform bacteria. The heat-resistant coliforms and total coliforms can utilize lactose fermentation to produce acid and gas at 44.5 ℃ and 36.5 ℃, respectively, including β - D-galactosidase (E.C.3.2.1.23). β - D-galactosidase can hydrolyze different substrates to produce colored substances.

Online Escherichia coli automatic monitoring instrumentReference standards:

Microbial indicators for standard testing methods of drinking water (GBJ/T 5750.12-2006)

Determination of fecal coliforms in water quality (HJ/T 347-2007)

Application scope:

Drinking water source area

Automatic monitoring station for surface water quality

Sewage treatment plant outlet, etc

FEATURES

♦ Easy to operate, suitable for unmanned online continuous monitoring, and can remotely upload detection data results.

♦ The volume of water sample collected for testing reaches 100mL, which can achieve low detection of 1/100mL.

♦ The relative error of comparison with laboratory methods should be less than 35%.

♦ On site testing output results to solve the problem of microbial characteristics easily changing during water sample collection and transportation, ensuring the accuracy of data results.

♦ According to the characteristics of the actual water sample being tested, a portable calibration module (based on national standard methods) can be used for on-site calibration. Reduce detection errors caused by differences between laboratory strains and strains in the environment.

♦ Built in turbidity correction function can reduce the impact of increased turbidity during microbial cultivation on detection results.

♦ The concentration range of the test water sample is wide to avoid the occurrence of fully positive results.

♦ Automatic pipeline disinfection and cleaning to eliminate cross interference of water samples.

♦ Equipped with a microcomputer communication structure, it has networking functions with the manufacturer's DCS and local environmental government departments.

Technical parameters:

♦Detection parameters: total coliform bacteria, heat-resistant (fecal) coliform bacteria, and Escherichia coli
♦Detection method: Enzyme substrate method
♦Sampling volume: 100mL

♦Testing time: less than 12 hours
♦Measurement range: 1 piece/100ml -1.0 × 109 pieces/100ml
♦Detection limit: 1/100ml
♦Cultivation temperature: 44.5 ℃± 1 ℃ (heat-resistant (fecal) coliforms and Escherichia coli)
36.5 ℃± 1 ℃ (total coliforms)
♦Zero point calibration: before each measurement
♦Reagent: Sodium hypochlorite culture medium
♦Pipeline cleaning: before and after each measurement
♦Pipeline disinfection: before and after each measurement
♦Alarm signals: temperature alarm, instrument malfunction alarm, etc
♦Communication interface: RS232/RS485
♦Power supply: 220VAC 50Hz
♦Power consumption: 200W
♦Environment: moisture-proof, dustproof, temperature 10-30 ℃
♦Dimensions: 420mm x 520mm x 1500mm (length x width x height)
♦Weight: 60kg