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Molecular Property Spectrometer (MPSTM) Flammable Gas Sensor

A leading gas detection program begins with leading and reliable gas sensor technology.

Proven, reliable sensor technology that can accurately detect and identify over 14 hazardous combustible gases.

Blackline Safety’s G7 connected gas detectors use industry leading Molecular Property Spectrometer (MPS™) Flammable Gas Sensor by NevadaNano for the detection of combustible gases. The MPS sensor’s innovative technology delivers TrueLEL™, offering the most accurate readings in the market for over 14 of the most common combustible gases and gas mixes — including hydrogen — while eliminating common issues found with traditional sensors.

MPS sensors can be used in complex industrial environments such as those in Oil & Gas, Petrochemical, Industrial Manufacturing, Water and Wastewater, Hazmat and Fire Response.

MPS combustible gas sensor
Key Features:
  • Poison immune
  • Multi-gas protection – including hydrogen
  • Accurate, automatic readings without correction factors
  • Automatic gas classification
  • Extended Lifetime (5+ years)
  • Reduced false alarms
Reliable and accurate flammable gas detection

The MPS sensor is intrinsically safe, stable, poison-resistant and can accurately detect over 14 combustible gases from one calibration with no false alarms or non-alarms due to a wide environmental operating range.

TrueLELTM Gas Detection

Butane C4H10
Ethane C2H6
Hydrogen H2
Isobutane HC(CH3)3
Isobutylene C4H8
Isopropanol C3H8O
Methane CH4
Methyl Ethyl Ketone C4H8O
Octane C8H18
Pentane C5H12
Propane C3H8
Propylene C3H6
Toluene C7H8
Xylene C8H10
* MPS may underreport when oxygen levels decrease. It is not recommended for use in SCBA/IDLH environments.
Resolution 1 %LEL
Response time (T90) < 20 seconds
Calibration Factory calibrated
Temperature -40 to 75 °C
Humidity 0 to 100 %RH
Pressure 80 to 120 kPa

Gain better visibility into your worksite with automated gas classification

The MPS sensor can analyze gas properties and classify gases based on their molecular weight and density into one of six gas categories. This important data is streamed directly to the Blackline Live cloud-based platform providing important insights into the location, frequency, and types of gases being encountered by a workforce.

The six classifications of gases are as follows:

Hydrogen gas detection


  • Average Molecular Weight: 2.0 [g/mol]
  • Density: 0.09 [kg/m3]
  • Typical # Carbons: 0
Hydrogen Mixture Gas Detection

Hydrogen Mixture

  • Average Molecular Weight: 1-14 [g/mol]
  • Density: 0.1-0.6 [kg/m3]
  • Typical # Carbons: varies
Methane and Natural Gas Detection

Methane/Natural Gas

  • Average Molecular Weight: 16-19 [g/mol]
  • Density: 0.6-0.9 [kg/m3]
  • Typical # Carbons: 1-2
Light Gas Hydrocarbon gas detection

Light Gas (or Light Gas Mixture)

  • Average Molecular Weight: 25-75 [g/mol]
  • Density: 1.2-2.5 [kg/m3]
  • Typical # Carbons: 1-4
  • Likely Gases: Ethane, Propane, Butane, Isopropanol
Medium Gas flammable hydrocarbon gas detection

Medium Gas (or Medium Gas Mixture)

  • Average Molecular Weight: 50-120 [g/mol]
  • Density: 1.5-4.0 [kg/m3]
  • Typical # Carbons: 2-8
  • Likely Gases: Pentane, Hexane
Heavy Gas combustible hydrocarbon gas detection

Heavy Gas (or Heavy Gas Mixture)

  • Average Molecular Weight: 80+ [g/mol]
  • Density: 3.5+ [kg/m3]
  • Typical # Carbons: 6+
  • Likely Gases: Octane, Toluene, Xylenes (aromatic hydrocarbons)

Sensor Technology

When deciding what type of gas detector you need, it's important to consider the application it will be used for. Each type of sensor has both advantages and disadvantages. The MPS sensor provides the reliability you need so you can be confident with the safety of your team.

Key Advantages
Key Limitations
MPSTM Sensor
Key Advantages
  • Immune to poisoning
  • Extended Lifetime (5+ years)
  • Detects full range of flammable gases
  • Accurately detects mixed gases
  • Classifies gases into one of six categories
  • Reduced false alarms due to built-in environmental compensation
  • Fail-safe, self-diagnostic capability
Key Limitations
  • Requires an oxygen atmosphere for accurate readings
Pellistor (Cat Bead) Sensor
Key Advantages
  • Detects full range of flammable gases
  • Predictable sensitivity and correction factors
  • Simple to operate
  • Long-lasting
Key Limitations
  • Susceptible to poisoning and inhibition
  • Requires an oxygen atmosphere for accurate readings
  • Sensor failures default to fail-to-unsafe
  • Significant variation in response to different gases
  • Readings are accurate for the target gas or when using correction factors. Other gases will be detected, but readings can be inaccurate.
Non-Dispersive Infrared (NDIR) Sensor
Key Advantages
  • Fail-to-safe failure modes
  • Immune to poisoning and inhibition
  • Low power consumption
  • Operates in oxygen-depleted and enriched environments
Key Limitations
  • Unable to detect hydrogen and acetylene
  • Readings are only accurate for the target gas. Other gases can be detected, but readings will be inaccurate

Additional Sensors:

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Information on Additional Sensors

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