El CerexMS Shepherd es un analizador multi-gas FTIR portable. Detecta hasta 385 especies gaseosas, 100+ USEPA HAPs, incorpora una celda interna de 22 metros de paso óptico y detector Cryo-cooled MCT. Estas características permiten niveles de detección del orden de las ppb.
| Shepherd FTIR Specifications (Portable FTIR Multi-gas Analyzer) | |
| General parameters | |
| Measuring principle | FTIR |
| Performance | Simultaneous analysis of up to 50 gas compounds |
| Response time, T90 | Typically < 120s, depending on the gas flow and measurement time. |
| Operating temperature | Short term 0-40⁰C, long term 5-30⁰C, non-condensing |
| Storage temperature | -20⁰C-60⁰C non-condensing |
| Power supply | 100 to 240 VAC/50-60Hz |
| Run Time | 3.5 Hour Battery, Continuous AC |
| Power consumption | Average 120W; Max 300W |
| Spectrometer | |
| Resolution | User configurable: 0.5cm-1, 2cm-1, 4cm-1, 8cm-1, 16cm-1, 32cm-1 |
| Scan frequency | 6 scans/s (@ 32wn resolution) |
| Detector | Standard: Sterling Cooled MCT, (Optional Application Dependent: 2 stage Peltier cooled MCT) |
| Source | SiC, 1550K |
| Beamsplitter | ZnSe |
| Window material | ZnSe |
| Wave number range | 600-4200 cm-1 |
| Sample cell | |
| Structure | Multi-pass: 16.8 meters to 21.6 meters. |
| Standard materials | Aluminum; Aluminum Oxide, PTFE, Rhodium, Nickel coatings available |
| Mirrors | Protected gold coating |
| Volume | 3.4 liters |
| Connectors | Standard inlet 18mm Parket Quick Connect, Standard outlet 18mm; Inlet adapter to Swagelok 6mm |
| Gaskets | Viton |
| Temperature | 50⁰C maximum |
| Window material | AR coated ZnSe |
| Measuring parameters | |
| Zero point calibration | 24 hours typical, N2 or Zero-Air (Not required if using synthetic background func- tionality) |
| Zero point drift | < 2% of measuring range per zero point calibration interval |
| Sensitivity drift | None |
| Linearity deviation | < 2% of measuring range |
| Temperature drifts | < 2% of measuring range per 10K temperature change |
| Pressure influence | < 1% change of measuring value for 1% sample pressure change. Ambient pressure changes measured and compensated |
| Additional Specifications | |
| Additional Specifications | Maximum signal to noise ratio (root mean square, 60s, 4 cm-1, at peak response): 50,000: 1 |
| Signal sampling: 24-bit ADC | |
| Short-term stability: < 0.09 % | |
| Temperature stability: < 1 % per C˚ | |
| Frequency repeatability (@ 1918 cm-1): < 0.001 cm-1 | |
| Frequency accuracy (@ 1918 cm-1): < 0.06 cm-1 | |
| Electrical connectors | |
| Digital interface | Direct control through touchscreen interface. Type A USB for data retrieval and ac- cessories. WiFi, RJ45 LAN, and RJ45 WAN Ports for local or internet based remote control using MODBUS TCP or VNC. |
| Power connection | MIL-C-26482 environment resistant circular Amphenol PT series. |
| PSS (Portable Sampling System) connection | Parker ST high flow quick connect. |
| Gas inlet and outlet conditions | |
| Gas temperature | 50C Maximum |
| Flow rate | 1-100 LPM, 6 LPM Typ. |
| Gas filtration | Internal 5 micron filter |
| Sample gas pressure | Ambient: Temperature and Pressure Correction |
| Sample pump | Internal |
| Electronics | |
| A/D converter | Dynamic range 109 dB |
| Signal processor | Dedicated FPGA and 32-bit floating point 1500MFLOPS CPU |
| computer | Integrated Touchscreen PC |
| Post Collection Analysis Software (for external PC) | |
| Operating system | Windows 7,8,10 |
| Analysis software | Cerex Data Processor |
| Enclosure | |
| Material | Polypropylene Pelican Case |
| Dimensions (cm) | 66.675 x 58.42 x 40.9575 cm (26.25x 23.0 x 16.125) |
| Weight | 39.5 Kg |