Non-Methane Hydrocarbon Analyzer – Series 9000 NMHC

Constant non-methane, methane and total hydrocarbons analysis based on a non-methane/methane calibration in noncondensing gases

The MOCON - Baeline Series 9000 NMHC is considered to be a microprocessor, flame ionization detector (FID)-based instrument that has been designed for constantly measuring the total content of hydrocarbons, methane and non-methane hydrocarbon in non-condensing gas samples in industrial or environmental settings. The analyzer is available in a wide range of configurations with internal components for multipoint or single sampling (without or with a sample pump) for pre-filtered (< 0.1 microns) non-condensing samples.

Detection limit down to < 60 ppb. User-programmable ranges from 1–1000 ppm (as methane, CH4) are factory-configured per the customer’s application in order to enable installation and setup.

MOCON, Inc. - Baseline’s FlowGuard electronic control is capable of regulating the delivery of air, fuel and a small portion of the sample gas, to the FID. A catalytic oxidizer is switched into and then out of a portion of the sample stream. The catalyst is responsible for oxidizing all hydrocarbons except methane, for a methane measurement. This is followed by automatically subtracting the methane value from the total hydrocarbon concentration in order to determine the non-methane hydrocarbon reading. The non-methane signal, referring to the difference of the two measured quantities, is considered to be more stable, decreasing systemic zero drift of the non-methane value.


  • Clean Rooms
  • VOC Continuous Emissions Monitoring Systems (CEMS)
  • Source Emissions Monitoring - Abatement System Efficiency
  • Inlet/Outlet VOC Abatement Process Equipment
  • Ambient Air Monitoring Networks (AQM)
  • Air and Oxygen Purity in Air Separation plants

Features and Benefits

  • Automatic FID ignition
  • Sleek rack mountable profile
  • Flame ionization detector (FID)
  • Automatic calibration at user-defined intervals
  • Internal multi-point sampling option
  • FlowGuard electronic control of fuel, sample and air
  • Electronic back-pressure regulator with sample bypass system
  • Discrete, multilevel concentration and fault alarms
  • Programmable analog output ranges
  • Graphical LCD display with simple to use menu system
  • Hydrocarbon detection from sub-ppm to 1000 ppm (methane)
  • Programmable relays for diagnostics, concentration, events and alarms
  • Remote operation through RS-232 and Ethernet
  • Automatic shut-off of fuel, sample and combustion air

All instrument parameters are clearly reported and continually refreshed on a large, graphical LCD display. Using analog, logic and digital output communication capabilities, analytical information from the analyzer can be attained using an external PC and a simple communications program such as Windows® HyperTerminal or the analyzer will be able to output ASCII or binary formats directly to a data acquisition system or PLC. Every Series 9000 analyzer comprises of MOCON, Inc. - Baseline's free PC utility 9000 Keeper used for storing and uploading multiple methods, and also for directly sending configuration settings to the analyzer.


Detector Flame Ionization (FID)
Oxidizer Oxidizes non-methane hydrocarbons
Ranges User definable based upon calibration within:
• 0.06 ppm to 200 ppm (Air balance)
• 0.10 ppm to 1,000 ppm (Air balance)
• 0.30 ppm to 200 ppm (O2 balance)

Accuracy ± 1%, full-scale
Accuracy ± 1%, full-scale
Accuracy ± 1%, full-scale
• Analyzer range configured at the factory
Repeatability ± 1% full-scale response
Drift, Zero ± 0.01% of full-scale over 24 hours
Drift, Span ± 1% of full-scale over 24 hours
Response Time T90 < 30 seconds
Sampling Internal single or multipoint modules for pre-filtered (< 0.1 microns) non-condensing samples, with or without sample pump
Alarms Multilevel concentration and fault alarms that result in an audible and visually displayed alarm
Alarms may also be mapped to relays to control external equipment
Calibration Programmable automatic or manual calibration
Support Gases Hydrogen (H2) — 35 cc/min (H2/He blend — 100 cc/min). Hydrocarbon content must be < 1 ppm.
Air — 175 cc/min (typical)
Fuel blend options available, consult MOCON - Baseline
Display Graphical LCD display, 3.4” x 4.5” (8.64 x 11.43 cm)
Outputs Digital
Standard: RS-232 LAN
Standard: 1 programmable 0–20 mA or 4–20 mA isolated output
Optional: 3 programmable analog outputs


Standard: 5 programmable Form A relays rated to 3 A @ 230 V AC
Optional: 9 programmable relays

Operating Temperature 32 to 104 °F (0 to 40 °C)
Operating Humidity 0 to 95% (non-condensing)
Configuration Bench-top or 19” (48.3 cm) rack-mount, 3U
Connections 1/4” (6.35 mm) tube fitting connectors
Power 100 – 240 V AC, 50/60 Hz, 3 A
Weight < 20 lb (9.07 kg)

MOCON - Baeline Series 9000 NMHC

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