Powerful Cavity Ring-Down Moisture Analyzer
Trace Level Moisture Analyzer Spark H2O

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Trace Level Moisture Analyzer Spark H2O Trace Level Moisture Analyzer Spark H2O


Based on Cavity Ring-Down Spectroscopy (CRDS), TigerOptics Spark H2O can measure the few ppb level of moisture 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
  • Ease of operation, no periodic replacement/maintenance
  • Compact and extremely low cost
  • H2O analysis over a vast range, H2O in N2 : 15ppb~2000ppm
  • Ethernet, isolated 4-20 mA and RS-232 connectivity

Cavity Ring-Down Spectroscopy(CRDS)

  1. 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. 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. 3.Once the photodiode detector “sees” a preset level of light energy, the light source is shuttered or diverted from the cavity.
  4. 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. 5.Once the light "rings down", the detector achieves a point of zero light energy in milliseconds, and the measurement is complete.

Fig 1. Ring-Down Cavity Cell


Fig 2. Ring-Down Time


Operating range See table below
Detection limit (LDL, 24 h 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 the LDL
Speed of response < 3 minutes to 90 %
Environmental conditions 10 ℃~40 ℃
30 %~80 % RH (non-condensing)
Storage temperature -10 ℃~50 ℃

Gas Handling System and Conditions

Wetted materials 316L stainless steel,
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 <1.4 slpm
Sample gases Most inert, toxic, and passive matrices
Gas temperature Up to 60 ℃

Dimensions and Weight

Electronics unit and sensor, H×W×D [in (mm)] 8.75×8.5×23.6 (222×216×599)
Sensor rack, H×W×D [in (mm)] 8.75×19×23.6 (222×483×599)
(fits up to two sensors)
Weight, standard sensor 32 lbs (14.5 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,
802.11g Wireless (optional),

Environmental Molecular Contaminant Monitor Tiger-i series

Trace Level Moisture Analyzer Spark H2O

Sample Gas, H2O Range LDL Sensitivity
In N2 0~2000 ppm 15 ppb 12 ppb
In O2 0~1000 ppm 7 ppb 6 ppb
In Ar 0~900 ppm 6 ppb 4.5 ppb
In He 0~450 ppm 4 ppb 3 ppb
In H2 0~1750 ppm 10 ppb 7.5 ppb
In Dry Air (CDA) 0~1800 ppm 14 ppb 10 ppb
In Ne 0~450 ppm 40 ppb 30 ppb
In Kr 0~1100 ppm 7 ppb 5.5 ppb
In Xe 0~1300 ppm 10 ppb 7.5 ppb

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