DR4900 Laboratory Spectrophotometer
The new benchtop spectrophotometer that succeeds the DR3900, with a 10-inch screen and built-in test diagnostics.
- New
- DR3900 successor
- 10"
- touchscreen
- Auto
- test diagnostics
Parameter
COD Testing: Reactors, Cuvette Tests & Online COD
Chemical oxygen demand (COD) measures the organic load in wastewater and is used for plant loading, permit compliance and trade-effluent charges.
Measurement options
Laboratory, portable and online COD measurement
Laboratory
Pre-dosed dichromate cuvette tests digested at 150 °C for two hours, read on a spectrophotometer with barcode recognition.
Portable & field
Portable spectrophotometers read cuvette tests on site once digestion is complete.
Online & process
UV-VIS spectral probes estimate COD continuously after correlation with laboratory results.
Products
Products for COD
DR3900 Laboratory Spectrophotometer
Proven benchtop VIS spectrophotometer with over 220 pre-programmed methods. Being replaced by the DR4900.
- 320–1 100
- nm range
- 220+
- methods
- Auto
- data logging
DR6000 UV-VIS Spectrophotometer
HACH's most advanced laboratory spectrophotometer, with high-speed UV-VIS scanning and 250 pre-programmed methods.
- UV-VIS
- high-speed scan
- 250
- methods
- 190–1 100
- nm range
DRB200 Digital Reactor Block
Digestion reactor for COD, total nitrogen and total phosphorus cuvette tests.
- COD
- TN · TP
- Pre-set
- programmes
- Dry
- block
LCK 314 COD Cuvette Test, 15–150 mg/L
Part no. LCK314Pre-dosed COD cuvette test for final effluent and low-load samples.
- 15–150
- mg/L O₂
- 25
- tests
- Barcode
- read
LCK 514 COD Cuvette Test, 100–2 000 mg/L
Part no. LCK514Pre-dosed COD cuvette test for influent and high-load samples.
- 100–2 000
- mg/L O₂
- 25
- tests
- Barcode
- read
Rocker CR 25 COD Reactor
Compact COD digestion reactor from Rocker.
- COD
- digestion
- Compact
- block
- Value
- alternative
Common questions
Which COD range should I order?
Choose a range that places your typical sample in the middle: low range (for example 15–150 mg/L) for final effluent and higher ranges (for example 100–2 000 mg/L) for influent. Dilute samples above the range.
How do I dispose of used COD vials?
Used vials contain chromium and mercury and must be handled as hazardous waste through a licensed contractor.
Need to measure COD?
Tell us your sample type, range and whether you need lab, portable or online measurement. We will recommend the right option.