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The new Model 201 Non Methane Hydrocarbon Analyzer (NMHC) is a reliable, rugged, flexible and versatile FID based monitoring system. The design is based on the catalytic oxidation of all hydrocarbons except methane. This provides the methane concentration, the reading without the converted is the total and the difference between the two readings is the non methane hydrocarbons (NMHC).

This instrument has a wide dynamic range (sub ppm to ppm) and can be used for ambient air or stack monitoring applications. This extends the applications and versatility of our Ambient Air Monitoring products. These Ambient Air instruments are used primarily for the measurement of BTX, and hydrocarbons.

The instrument is reliable and will easily interface with process control computers or Air Monitoring Data systems through 4-20 mA, RS232, MODBUS ...

Features

• Fast response -2 minute cycle
• Readings Available
• Total Hydrocarbons
• Methane
• Non Methane HC
• Zero & Span values stored in micro processor
• Automatic calibration system– zero & span
• Wide dynamic range low to high ppm ranges
• Excellent stability (zero & span)
• Durable & rugged design

Controls

• The Microprocessor based Smart meter stores the values for the zero and span that are set from the program key on the front panel
• Calibrate switch- select zero or span gas– the rest is automatic

Options

• 19" Enclosed rack unit
• (Z purged unit meets class I division II NEC requirements- wall mount only
• X purged unit meets class I division I NEC requirements- wall mount only.

Specifications

• Model: 201-NMHC
• Measurement technique: Catalytic combustion–FID
• Species measured: Total HC, Methane, Non Methane Hydrocarbons
• Ambient Humidity: < 95%
• Electrical classification: General purpose
• Response cycle: < two minutes
• Sample flow rate: >1 LPM
• Reproducibility: +/- 1-2 %
• Zero drift: <2% over 1 week
• Span drift: <2% over 1 week
• Temperature range: -5-45°C
• Temperature range of sample: 0-50°C
• Range: sub ppm to low ppm
• Readout: Digital- 5 digit bright LED Display
• Power requirements: 100V, 115V, 220V, 240V- Universal power supplies
• Dimensions:
• Enclosed rack: 19" W x 11"H x 23"D
• Weight: 25 pounds
• Power consumption: 200 watts max.
• Instrument operating conditions: 5-40 oC, dewpoint of the gas must be 10oC below the measuring temperature
• Outputs: 0-1V,4-20 mA, RS232, RS485, MODBUS

Applications

• Non methane Hydrocarbons in ambient air
• Non methane hydrocarbons in compressed gases or breathing air
• Stack gas measurement (Non Methane Hydrocarbons) in refineries or chemical plants
• Methane leaks in natural gas transmission EPA requires the measurement of Non methane hydrocarbons not total hydrocarbons from refineries and chemical plants. This is also an ideal instrument for ambient air monitoring because of its simplicity & response.

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