55 i 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.

Preset ranges0-5, 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 noise0.025 ppm RMS (300 second averaging time)
Minimum detectable0.050 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
Precision2.0% of reading or 50 ppb (whichever is larger)
Linearity+/-2.0% of span (at concentrations of 10% to 100% of span
Sample flow rate0.5 lpm, minimum
Makeup air flow rate275 cm3 to 350 cm3 hydrocarbon free air
Fuel flow rate25 cm3 to 50 cm3 Hydrogen or ~100-150cm3 H2/He mixture
Carrier gas flow rate35 cm3 to 70 cm3 nitrogen
Operating temperature15°C to 35°C
Power requirements100 VAC, 115 VAC, 220-240 VAC +/-10%, 50/60Hz, 420W
Size and weight16.75″ (W) × 8.62″ (H) × 23″ (D), 60 lbs. (17.7 kg)
OutputsSelectable voltage, RS232/RS485, TCP/IP, 10 status relays, and power fail Indication (standard). 0-20 or 4-20 mA isolated current output (optional)
Inputs16 digital inputs (standard), 8 0-10Vdc analog inputs (optional)
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