- Back-flush GC system separates methane (CH₄) from NMHCs using a stripper column for distinct measurements
- Direct, real-time measurement of CH₄ and NMHCs
- High-accuracy readings even at low ppm levels for total hydrocarbons (THC)
- Automated operations including auto-flame sensing/ignition, auto-calibration, and span checks
- iSeries platform with enhanced electronics, intuitive interface, large display, and Ethernet connectivity for remote management
- Flash memory for extensive data storage with downloadable software support
55i Direct Methane & Non-Methane Hydrocarbon Analyzer
Make automated measurements of methane and non-methane hydrocarbons with the Thermo Scientific™ Direct Methane & Non-Methane Hydrocarbon Analyzer, Model 55i. Unlike instruments that measure only methane and total hydrocarbons, this back-flush gas chromatography (GC) system provides a direct measurement of non-methane concentrations.
- Ambient Air Quality Monitoring: Measuring low levels of hydrocarbons in the surrounding atmosphere to assess general air quality and track pollutants.
- Industrial Hygiene: Monitoring air in industrial settings to ensure workplace safety standards are met by detecting potentially harmful hydrocarbon concentrations.
- Environmental Research: Used by researchers and scientists to study atmospheric composition, track greenhouse gas emissions (specifically methane), and understand air pollution sources.
- Compliance and Regulatory Reporting: Providing accurate data for industries to comply with environmental regulations regarding volatile organic compound (VOC) emissions and air quality standards.
- Continuous Emissions Monitoring Systems (CEMS): While more general, the technology is robust enough to be incorporated into CEMS for continuous monitoring of specific industrial processes and emissions.
| Preset ranges | 0-5, 50, 500 ppm, or 0-10, 100, 1000 ppm, or 0-20, 200, 2000 ppm, or 0-50, 500, 5000 ppm Group selectable at time of order |
| Zero noise | 0.025 ppm RMS (300 second averaging time) |
| Minimum detectable | 0.050 ppm CH4-0.050 NMHC as propane (300 second averaging time) |
| Zero drift (24 hour) | Auto-zero each cycle |
| Span drift (24 hour) | < 2% Span value (without auto calibration) |
| Response time (90%) | ~ 70 seconds |
| Precision | 2.0% of reading or 50 ppb (whichever is larger) |
| Linearity | +/-2.0% of span (at concentrations of 10% to 100% of span |
| Sample flow rate | 0.5 lpm, minimum |
| Makeup air flow rate | 275 cm3 to 350 cm3 hydrocarbon free air |
| Fuel flow rate | 25 cm3 to 50 cm3 Hydrogen or ~100-150cm3 H2/He mixture |
| Carrier gas flow rate | 35 cm3 to 70 cm3 nitrogen |
| Operating temperature | 15°C to 35°C |
| Power requirements | 100 VAC, 115 VAC, 220-240 VAC +/-10%, 50/60Hz, 420W |
| Size and weight | 16.75″ (W) × 8.62″ (H) × 23″ (D), 60 lbs. (17.7 kg) |
| Outputs | Selectable voltage, RS232/RS485, TCP/IP, 10 status relays, and power fail Indication (standard). 0-20 or 4-20 mA isolated current output (optional) |
| Inputs | 16 digital inputs (standard), 8 0-10Vdc analog inputs (optional) |
