Chemical oxygen demand (COD) is a chemical method for measuring the amount of oxidized reducing substances in water samples need.Water samples under certain conditions, the amount of oxidant to oxidize the sample in 1 liter of water consumed reducing substances as an index, converted into a liter of water sample is oxidized after all, the number of milligrams of oxygen required for in mg / L.It reflects the degree of water contamination reducing substances.This indicator also serves as one of the comprehensive index Relative organic content.

Features
Instruments complete digestion than one color, simple and reliable structure, reducing potential errors.
Imported modified PTFE transparent hose, diameter greater than 1.5mm, reducing the chances of blockage of water-like particles.
Can automatically clean sampling pipes to prevent algae or biofilm formation.
Error reset and power off the call, the instrument automatically discharge the residual reactants instrument automatically return to work status.
Low failure rate, maintenance, less reagent consumption.
Intelligent self-diagnostics, alarm, equipment management and maintenance very convenient.
Imported PLC control devices to reduce environmental interference and equipment failure.
Multi-channel valve, strong corrosion resistance, long life, safe and reliable.

Applications
Adapted COD in 10 ~ 2000mg / L range, and the chloride concentration of less than 2.5g / L Cl¯ waste water, according to the actual requirements, can be applied to a chloride concentration of less than 20g / L Cl¯ wastewater.
Online monitoring of industrial wastewater pollution
Online monitoring of industrial process water
Water treatment plant Municipal Sewage Water Online Monitoring & Exports

Technical Parameters
Type No .: DH310C1
Methods based on: the national standard GB11914-89 "Water Quality - Determination of the chemical oxygen demand - dichromate method"
Measuring range: 10 ~ 2000mg / L COD
Accuracy: Indication error ≤ ± 10%
Repeatability error: ≤ ± 10%
Measuring cycle: the minimum measurement period of 40min, according to the actual water samples can be arbitrarily modified 5 ~ 120min digestion time.
Sampling period: time interval (20 ~ 9999min adjustable) and the whole point measurement mode
Correction: timing instrument sensitivity and zero correction
Calibration cycle: 1 to 99 days at any arbitrary time interval adjustable
Maintenance cycle: Usually once a month, each about 30min
Analog output: 4 ~ 20mA
Signal Interface:. RS232 / RS485
The actual water samples Contrast: Error ≤ ± 10%
MTBF: ≥720h / times
Environmental requirements: Recommended temperature + 5 ~ 28 ℃; humidity ≤90% (non-condensing)
Dimensions: 1500 × 550 × depth width 450 (mm)
Power: AC220 ± 10% V, 50 ± 10% Hz, 5A
Other: abnormal alarm and power without losing data; touch-screen display and command input; abnormal reset and power off the call, the instrument automatically discharge the residual reactants is automatically return to work status.

Workstation installation (recommended) a schematic plan