Powerful Cavity Ring-Down Gas Analyzer
Trace Level Gas Analyzer HALO3 series

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Trace Level Gas Analyzer HALO3 series Trace Level Gas Analyzer HALO3 series


Based on Cavity Ring-Down Spectroscopy (CRDS), TigerOptics HALO3 series can measure the sub-ppb level of gas species with absolute accuracy, proven reliability, and fast response in one compact and easy-to-use device.


  • Quality control for laboratory analysis
  • Gas and chemical manufacturing
  • R&D of moisture analysis and moisture standard


  • NIST traceable
  • High sensitivity, high accuracy, high reliability, high speed of response
  • Compact, ease of operation, no periodic replacement/maintenance
  • Analyte: H2O, CO, CO2, CH4, HF, etc.
  • Gas analysis over a vast range, H2O in N2 : 400ppt~20ppm (HALO KA H2O)
  • Ethernet, isolated 4-20 mA and RS-232 connectivity

Cavity Ring-Down Spectroscopy(CRDS)

1.A Continuous Wave (CW) diode laser emits a directed beam of light energy through an ultra-high reflective mirror into the absorption cell (cavity).

2.The light reflects back and forth between two ultra-high reflective mirrors multiple times, up to a total path length of 100 kilometers.

3.Once the photodiode detector “sees” a preset level of light energy, the light source is shuttered or diverted from the cavity.

4.On each successive pass, a small amount of light or ring-down signal emits through the second mirror and is sensed by the light detector.

5.Once the light "rings down", the detector achieves a point of zero light energy in milliseconds, and the measurement is complete.

Ring-Down Cavity Cell

Fig 1. Ring-Down Cavity Cell

Ring-Down Time

Fig 2. Ring-Down Time


Operating range See table below
Detection limit(LDL,24h peak-to-peak variation) See table below
Sensitivity(3σ) See table below
Precision(1σ,greater of) ± 0.75 % or 1/3 of Sensitivity
Accuracy(greater of) ± 4 % or 1/2 of LDL
Speed of response See table below
Environmental conditions 10℃~40℃
30%~80% RH(non-condensing)
Storage temperature -10℃~50℃

Gas Handling System and Conditions

Wetted materials 316L stainless steel (Optional Hastelloy)
10 Ra surface finish
Gas connections 1/4” male VCR inlet and outlet
Inlet pressure 10~125 psig (1.7~9.6 bara)
Flow rate 0.05~1.8 slpm (gas dependent)
Sample gases Most inert、toxic、and、passive matrices
Gas temperature Up to 60 ℃

Dimensions and Weight

Standard sensor
H×W×D [in (mm)]
8.75×8.5×23.6 (222×216×599)
Sensor rack
H x W x D [in (mm)]
8.75×19×23.6 (222×483×599)
(fits up to two sensors)
Weight,Standard sensor 28 lbs (12.7 kg)


Alarm indicators 2 user programmable
1 system fault
Form C relays
Power requirements 90~240VAC
Power consumption 40 Watts max.
Signal output Isolated 4-20mA persensor
User interfaces 5.7"LCD touchscreen


Analyte Range LDL Sensitivity Speed of response
H2O in N2 0~20ppm 400ppt 300ppt 3 min to 95 %
H2O in He 0~4ppm 200ppt 60ppt
H2O in Ar 0~9ppm 200ppt 130ppt
H2O in O2 0~16ppm 300ppt 200ppt
H2O in H2 0~10ppm 200ppt 150ppt


Analyte Range LDL Sensitivity Speed of response
H2O in N2 0~20ppm 0.8ppb 0.6ppb 3 min to 95 %
H2O in He 0~4ppm 0.25ppb 0.12ppb
H2O in Ar 0~9ppm 0.4ppb 0.3ppb
H2O in O2 0~16ppm 0.6ppb 0.4ppb
H2O in H2 0~10ppm 0.4ppb 0.3ppb


Analyte Range LDL Sensitivity Speed of response
H2O in N2 0~20ppm 1.5ppb 1.2ppb 3 min to 95 %
H2O in He 0~4ppm 0.3ppb 0.25ppb
H2O in Ar 0~9ppm 0.7ppb 0.6ppb
H2O in O2 0~16ppm 1.2ppb 1.0ppb
H2O in H2 0~10ppm 0.9ppb 0.7ppb

HALO 3 H2O 500

Analyte Range LDL Sensitivity Speed of response
H2O in N2 0~500ppm 10ppb 8ppb 3 min to 95 %
H2O in He 0~125ppm 5ppb 4ppb
H2O in Ar 0~200ppm 8ppb 6ppb
H2O in O2 0~400ppm 8ppb 6ppb
H2O in H2 0~250ppm 10ppb 8ppb

Other HALO3 series

Model/Analyte Range※ LDL※ Sensitivity※ Speed of response
HALO3 CO/CO 0~2000ppm 100ppb 70ppb 1min to 90 %
HALO3 CO2 Low range/CO2 0~12ppm 10ppb 7ppb 3min to 95 %
HALO3 CO2 High range/CO2 0~1500ppm 300ppb 250ppb 1min to 90 %
HALO3 CH4/CH4 0~8ppm 2.0ppb 1.6ppb 3min to 95 %
HALO3 HF/HF 0~5ppm 0.5ppb 0.4ppb 1min to 90 %

※In N2 gas


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