Overview
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.
Application
- Quality control for laboratory analysis
- Gas and chemical manufacturing
- R&D of moisture analysis and moisture standard
Features
- 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．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.
Fig 1. Ring-Down Cavity Cell
Fig 2. Ring-Down Time
Performance
| 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) |
Electrical
| 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), RS-232 |
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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