Summary
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.
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
- 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.
Fig 1. Ring-Down Cavity Cell
Fig 2. Ring-Down Time
Performance
| 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) |
Electrical
| Alarm indicators | 2 user programmable 1 system fault Form C relays |
| Power requirements | 90～240VAC 50/60Hz |
| Power consumption | 40 Watts max. |
| Signal output | Isolated 4-20mA persensor |
| User interfaces | 5.7"LCD touchscreen 10/100Base-TEthernet 802.11gWireless(optional) RS-232 |
HALO KA H2O
| 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 |
HALO 3Q H2O
| 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 |
HALO 3 H2O
| 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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