Total Hydrocarbon Analyzer

Measure total hydrocarbons in emissions from a source using the Thermo Scientific™ Model 51i Total Hydrocarbon Analyzer. The Model 51i utilizes Flame Ionization Detector (FID) technology to provide a wide linear range and sensitive detection of organic compounds. Available in both high-temperature and low-temperature versions.


The Model 51i uses a flame ionization detector, or FID, to measure organic gases and vapors. Flame ionization is a well-known and highly efficient technology used in laboratories and industry for many years.

Key Features:

  • Adjustable ranges
  • Real-time correction of THC readings
  • Temperature controlled detector oven and sampling system
  • Reporting of alarm conditions

iSeries Advantage:

  • Ethernet connectivity for efficient remote access
  • Enhanced user interface with one-button programming and large display screen
  • Flash memory for increased data storage and user downloadable software
  • Enhanced electronic design for optimized product commonality
  • Improved layout for easier accessibility to components
Detection Limits 0.050 ppm (10 sec. averaging time)
Flow Rate 0.75 to 1.5 L/min.
Inputs 16 Digital Inputs (Standard), 8 0 to 10 VDC Analog
Linearity ±2% of span (at concentrations of 10 to 150% of span)
Response Time 15 sec. (1 sec. average time)
Span Drift <2% of range or 0.20 ppm (24 hr.)
Temperature (English) Operating 59°F to 95°F
Temperature (Metric) Operating 15°C to 35°C
Zero Noise 0.025 ppmc RMS
Certifications/Compliance ETL, CSA, UL, CE, UKCA
Depth (English) 23 in.
Depth (Metric) 584 mm
Description High Temperature
Height (English) 8.62 in.
Measurement Range Preset Ranges: 0 to 1, 10, 100, 1,000, 5000, and 10000ppmc; Custom Ranges: 0 to 1 to 10000ppmc
Mounting Options Bench mounting (standard); Ears and handles, EIA;
Outputs Selectable Voltage, RS232/RS485, TCP/IP, 10 Status Relays, Power Fail Indication; 0 to 20 or 4 to 20mA Isolated Current Output (optional)
Precision 2.0% of reading or 0.1 ppm (whichever is larger)
Weight (English) 50 lb.
Weight (Metric) 22.7 kg
Width (English) 16.75 in.
Width (Metric) 425 mm
Zero Drift <0.50ppm/day
Unit Size Each