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| Brand | Thermo Fisher Scientific |
|---|---|
| Origin | USA |
| Model | 55i |
| Detection Principle | Back-Flush Gas Chromatography with Flame Ionization Detection (GC-FID) |
| Measurement Range Options | 0–5 / 50 / 500 ppm, 0–10 / 100 / 1000 ppm, 0–20 / 200 / 2000 ppm, or 0–50 / 500 / 5000 ppm (as propane-equivalent NMHC) |
| LOD (300-s avg) | 0.050 ppm for CH₄ and NMHC |
| Zero Noise | 0.025 ppm RMS |
| Response Time (t₉₀) | ~70 s |
| Precision | ±2.0% of reading or ±50 ppb (whichever is greater) |
| Linearity | ±2% of span (10–100% full scale) |
| Sample Flow Rate | ≥0.5 L/min |
| Carrier Gas | N₂, 25–50 mL/min |
| Hydrogen Fuel Gas | 25–50 mL/min (or 100–150 mL/min H₂/He blend) |
| Air for FID | 275–350 mL/min |
| Operating Temperature | 15–35 °C |
| Power | 100–240 VAC ±10%, 50/60 Hz, 420 W |
| Dimensions | 42.5 × 21.9 × 58.4 cm (W×H×D) |
| Weight | 27.2 kg |
| Data Output | Analog (0–20/4–20 mA), RS232/RS485, TCP/IP, 10 relay status channels, power-fail indicator |
| Digital Inputs | 16-bit standard |
| Analog Inputs | 8–10 V (optional) |
| Internal Storage | Flash memory |
| Connectivity | Ethernet port for remote control, data export, and firmware updates |
| Brand | Thermo Fisher |
|---|---|
| Origin | USA |
| Model | 5900-A |
| Detection Principle | Gas Chromatography with Flame Ionization Detection (GC-FID) |
| Detection Limit | ≤30 ppb (as methane) |
| Compliance | ASTM D6348, EPA Method 25A, HJ 1012-2018, HJ 38-2017 |
| Installation Form | 19-inch rack-mountable chassis |
| Control System | Integrated EPC (Electronic Pressure Control) for carrier gas and sample flow |
| Data Output | Modbus TCP, RS-232/485, Analog 4–20 mA |
| Software | Thermo Scientific Chromeleon™ CDS (with 21 CFR Part 11 compliance option) |
| Operating Environment | 5–40 °C, <90% RH non-condensing |
| Power Supply | 100–240 VAC, 50/60 Hz |
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