TL – 2800 Single Channel/TL-2900 Dual Channel Analyzer

The TL-2800 Single Channel/2900 Dual Channel Analyzer is a low maintenance continuous flow system for analysis of inorganic nitrogen (ammonia, nitrate/nitrite) in aqueous solutions.

  • Patented gas diffusion / conductivity principle provides results generally unaffected by sample turbidity, color, or pH.  
  • Commonly used in water, wastewater, and agricultural applications.  
  • Optional activated zinc reduction cartridge allows the user to add the analysis of TIN and nitrate/nitrite in addition to ammonia.  
  • TKN and TN can be analyzed directly after digestion without further sample preparation (distillation).


The TL-2800 is a bench top laboratory instrument with integrated data acquisition software. Our instrument is designed with the user in mind providing them with an intuitive user interface and operational simplicity unmatched by our competitors. Ultra-sensitive ammonia detection down to the ppb level is easily achieved with a cycle time of 1.5-2.5 minute per sample. A dual channel version, the TL-2900, is available for users requiring higher sample throughput when measuring ammonia and nitrate/nitrite. For pricing info, click here. To request a Live Video Demo, click here. 

Software & Automated Operation
  • Built in Windows computer with preloaded data acquisition software
  • Easy connection to networks, printers, or external USB drives
  • The TL-2800 is paired with an autosampler to facilitate automated operation. Three autosampler options are available to accommodate a wide range of sample volumes.
Principle of Operation

An 8-roller peristaltic pump directs sample, caustic, and absorbing solutions into a tubular diffusion membrane assembly. Within the assembly, sample is mixed with the caustic solution resulting in a mixture with a pH of 11 or higher. At this pH level, virtually all ammonium ions present in the sample are converted to dissolved ammonia gas.  As the sample & caustic mixture flows over the tubular membrane, dissolved ammonia  gas diffuses through the membrane wall and is absorbed by a buffered solution at pH 6.5 flowing on the inside. The measured change in electrical conductance of the absorbing solution is proportional to the concentration of ammonium ion present in the sample.  Passing the sample/caustic mixture through an optional zinc reduction cartridge reduces nitrate and nitrite ions to ammonium ions, allowing measurement of the total inorganic nitrogen concentration.

1Carlson, R.M.; Anal. Chem., 50(1978) 1528. 2Carlson, R.M.; Anal. Chem., 58(1986) 1590.


  • High sample throughput.
  • Low annual maintenance cost.
  • Results generally unaffected by sample turbidity, color, or pH.
  • Minimal reagent requirements – Click here to find out more
  • Wide analytical range from ppb to %


  • Dimensions: 6.5″H x 18.5″W x 20.5″D
  • Weight: 21 lbs
  • Principles of Operation: Membrane Diffusion / Conductivity detection
  • Concentration Range (Standard Sensitivity Membrane): Standard Sensitivity: 50 ppb to 500 ppm
  • Concentration Range (High Sensitivity Membrane): Standard Sensitivity: 10 ppb to 10 ppm
  • Sample Rate: One sample every 1.5-2.5 minutes
  • Required Reagents: Sodium or Potassium Hydroxide, DTPA, Deionized Water, Boric Acid, Ammonium Hydroxide. Click here to find out more.
  • Flow Path Wetted Parts: Polymers, PVC , SS, Electrodes-gold plated
  • Power Supply: 120 VAC or 240 VAC 50/60Hz


  • Model TL-2800 Single Channel Ammonia and Nitrate Analyzer – Part Number: 2800
  • Model TL-2900 Dual Channel Ammonia and Nitrate Analyzer – Part Number: 2900
  • Zinc Reduction Cartridge, 10/pkg – Part Number: 2001
  • Replacement Peristaltic Pump Cartridge – Part Number: 2004
  • High Sensitivity Membrane – Part Number: 2010
  • Standard Sensitivity Membrane – Part Number: 2050
  • Back Pressure Regulator (Nominal 6 psi) – Part Number: 2070
  • Conductivity Cell – Part Number: 2080
  • Peristaltic Pump Tubing, 1.02mm ID, 12/pkg – Part Number: 2082
  • Peristaltic Pump Tubing, 1.42mm ID, 12/pkg – Part Number: 2083
  • Tubing Kit – 1.14mm ID and 1.42 mm ID Flexible PVC Tubing – Part Number: 2084
  • Fitting Accessory Kit – Part Number: 2085
  • Peristaltic Pump Tubing, 1.6mm ID, 12/pkg – Part Number: 2086
  • Timberline Autosampler Accessory Kit – Part Number: 2087


TL-2800 Brochure
Water Brochure
Agriculture Brochure
Wastewater Brochure
TKN Paper
TL-2800 Instruction Manual
TL-2900 Instruction Manual
EPA Federal Register
EPA ATP Review Letter
EPA R7 Approval for Iowa NPDES Facilities
Timberline Ammonia EPA Method
Single Channel Software Manual
Dual Channel Software Manual
Low Level Detection of Ammonia Webinar


For pricing, information such as your number of samples per day and whether you’re measuring ammonia, nitrate/nitrite, or both, will help us to quote the best system for your application. Please fill out a Request a Quote form, which includes this information, to help us give you an accurate price based off the instrument you want.  You can also contact us directly via or 800.777.5996.