Versatile, sensitive and hassle-free trace ammonia analysis

Ammonia (NH3) is a key impurity in many applications, ranging from industrial process control to the analysis of fuel cell hydrogen. Tiger Optics delivers a powerful analytical tool for the measurement of NH3, based on Continuous-Wave Cavity Ring-Down Spectroscopy (CW-CRDS). The HALO 3’s low detection limit, drift-free operation, and compatibility with many different sample gases make it an ideal tool for monitoring trace amounts of ammonia, for example, to ensure compliance with SAE J2719, ISO 14687 or similar purity standards for hydrogen used for fuel cell electric vehicles (FCEVs)*.

Highly specific to the target molecule, CW-CRDS also prevents cross-interferences from distorting your measurement. Plus, there is no need to perform costly and time-consuming zero and span calibrations, saving both time and money with continuous, online service.

Designed for ammonia analysis in laboratory and process applications:

  • Accuracy traceable to the world’s major national reference labs
  • Industry-proven technology
  • Freedom from the need for span calibrations
  • No periodic sensor replacement/maintenance
  • Sub-part-per-billion (ppb) detection limit
  • Wide dynamic range and no drift

*For fuel-cell hydrogen analysis according to ASTM Standard Test Method D7941, the method detection limit (MDL) is 1 ppb, as determined via U.S. EPA 40 CFR Part 136 Appendix B (95% Confidence Limit).


  • Gaseous CRMs & Calibration Gas Mixtures
  • High-Purity Gases & Systems
  • Hydrogen Fuel Cells
  • Research & Development
  • Syngas & Fuel Gas Production

Learn More


Laboratory & Scientific

Stack, Process & CEMS

Detection Capability

Detection and Matrix Range LDL (3σ) Precision (1σ) @ zero
Standard Model
NH3 in N2 (Low Range) 0 – 7 ppm 0.4 ppb 0.15 ppb
NH3 in N2 (Mid Range) 0 – 35 ppm 2.5 ppb 0.8 ppb
NH3 in N2 (High Range) 0 – 130 ppm 9 ppb 3 ppb
NH3 in H2 (Low Range) 0 – 6 ppm 0.3 ppb 0.10 ppb
NH3 in H2 (Mid Range) 0 – 30 ppm 2.0 ppb 0.7 ppb
NH3 in H2 (High Range) 0 – 110 ppm 7 ppb 2.5 ppb
NH3 in CO2 0 – 30 ppm 2.5 ppb 0.8 ppb
N2O Model
NH3 in N2 0 – 150 ppm 7 ppb 2.5 ppb
NH3 in N2O 0 – 200 ppm 8 ppb / 40 ppb 3 ppb / 15 ppb
Dry vacuum pump required


Operating range See Detection Capability table
Detection limit (LDL, 3σ/24h) See Detection Capability table
Precision (1σ, greater of) ± 0.75% or 1/3 of LDL
Accuracy (greater of) ± 4% or LDL
Speed of response < 3 minutes to 95%
Environmental conditions 10°C to 40°C, 30% to 80% RH (non-condensing)
Storage temperature -10°C to 50°C
Gas Handling System and Conditions*
Wetted materials 316L stainless steel, 10 Ra surface finish
Gas connections 1/4″ male VCR inlet and outlet
Leak tested to 1 x 10-9 mbar l / sec
Inlet pressure 10 – 125 psig (1.7 – 9.6 bara)
Flow rate ∼1 slpm
Sample gases Most inert, toxic, passive and corrosive matrices
Gas temperature Up to 60°C
Dimensions, H x W x D
Standard sensor 8.73″ x 8.57″ x 23.6″ (222 mm x 218 mm x 599 mm)
Sensor rack (fits up to two sensors) 8.73″ x 19.0″ x 23.6″ (222 mm x 483 mm x 599 mm)
Standard sensor 34 lbs (15.4 kg)
Alarm indicators 2 user programmable, 1 system fault, Form C relays
Power requirements 90 − 240 VAC, 50/60 Hz
Power consumption 40 Watts max.
Signal output Isolated 4−20 mA per sensor
User interfaces 5.7” LCD touchscreen, 10/100 Base-T Ethernet, RS-232
802.11g Wireless (optional), Modbus TCP (optional)
Certification CE Mark
U.S. Patent #7,277,177
*Analysis in some specialty gases and certain
applications may require a vacuum pump for operation.
Please contact us to discuss your specific requirements.

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