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Hazardous area sensors
The following products or series are intrinsically safe or have an intrinsically safe option.

General purpose sensors

786A general purpose accelerometer  
787A standard accelerometer, side exit  
793 premium accelerometer  
797 premium accelerometer, side exit  
786F accelerometer with integral cable  
780A compact accelerometers  
786A-M12 general purpose accelerometer  

Low-frequency sensors

793L premium filtered accelerometer  
799M premium, high-sensitivity, filtered accelerometer  
786-500-D2 high output accelerometer  
797L premium accelerometer, side exit  
793L-33 premium, low frequency accelerometer  

High-temperature sensors

376E/CC726E intrinsically safe accelerometer and charge amplifier system  

Dual vibration and temperature sensors

786T affordable dual-output sensors  

Triaxial sensors

993B-7-M12 triaxial sensor  

Acceleration output, top-exit

PC420A-EX loop powered sensors  
PC420A-IS series  

Velocity sensors

793V/793V-5 velocity output sensor  
797V premium side exit velocity sensor  
893V general purpose velocity output sensor  

Acceleration output, side-exit

PC421A-IS series  
PC423A-IS series  

Velocity output, top-exit

PC420V-EX series  
PC420V-IS series  

Velocity output, side-exit

PC423V-Dz series  
PC423V-IS series  

Low-power, low-voltage

LPA100T low-power, low-voltage sensor  

Standard certified sensors

Class I Div 1 (Zone 0) certified sensors

786A-M12-IS certified accelerometer with M12-style connector  
376  
376E/CC726E intrinsically safe accelerometer and charge amplifier system  
712E/CC712E  
766 certified high frequency sensors  
780A-IS compact accelerometer  

Standard certified sensors

Class I Div 2 (Zone 2) certified sensors

376E/CC726E Intrinsically safe accelerometer and charge amplifier system  
786A-D2 general purpose accelerometer  

 


UNITED STATES — FACTORY MUTUAL (FM)
Division 1, Classes I, II, III, Groups A, B, C, D, E, F, and G

In the United States, Article 500 of the National Electrical Code (NFPA 70) defines the following divisions:

Division 1 Hazardous concentrations of flammable gases, vapors—or combustible dusts in suspension—continuously, intermittently, or periodically present under normal conditions.

Divsion 2 Volatile flammable liquids or gases are present, but are normally confined within closed containers or the flammable vapors are normally prevented by positive mechanical ventilation and from which they can escape only under abnormal operating or fault conditions. Combustible dusts are not normally, nor likely, to be thrown into suspension.

Following are typical flammable gases, vapors, mists and ignitable dusts, fibers and filings. They are classified according to the spark energy required to ignite the most easily ignitable mixture with air.

  • Class I
    • Group A Acetylene
    • Group B Hydrogen
    • Group C Ethylene
    • Group D Propane
  • Class II
    • Group E Conductive Dust (metal dusts)
    • Group F Carbonaceous Dust (coal dusts)
    • Group G Non-Conductive Dust (grain dusts)
  • Class III
    • Fibers
    • Flyings (material larger than dust that are not normally in suspension in air)

CANADA — CANADIAN STANDARDS ASSOCIATION (CSA)
Division 1, Class I, Groups A, B, C, and D

In Canada, Section 18 of the Canadian Electrical (Code C22.1), the standards are similar in concept to the United States standards although different procedures are used to match a barrier to a hazardous area instrument.


UNITED KINGDOM & EUROPE
Zones 0-2, Groups I, IIA, IIB, IIC

In Europe, CENELEC standard EN 50 014 defines the following zones:

  • Zone 0 Hazardous gas atmosphere is continuously present or is present for long periods of time (ia apparatus only)
  • Zone 1 Hazardous gas atmosphere is likely to occur during normal operation (ia or ib apparatus only)
  • Zone 2 Hazardous gas atmosphere is not likely to occur during normal operatings, or will only occur for short periods of time (ia or ib apparatus only)

Following are typical flammable gases, vapors, and mists. They are classified according to the spark energy required to ignite the most easily ignitable mixture with air.

  • Group IIC Acetylene, Hydrogen
  • Group IIA Propane
  • Group IIB Ethylene
  • Group I Methane (firedamp)

AUSTRALIA—SAFETY IN MINE TESTING & RESEARCH STATION
Zones 0-2, Groups I, IIA, IIB, IIC

In Australia, the standards are similar in concept to the European CENELEC standard EN 50 014, which defines the following zones:

  • Zone 0 Hazardous gas atmosphere is continuously present or is present for long periods of time (ia apparatus only)
  • Zone 1 Hazardous gas atmosphere is likely to occur during normal operation (ia or ib apparatus only)
  • Zone 2 Hazardous gas atmosphere is not likely to occur during normal operatings, or will only occur for short periods of time (ia or ib apparatus only)

Following are typical flammable gases, vapors, and mists. They are classified according to the spark energy required to ignite the most easily ignitable mixture with air.

  • Group IIC Acetylene, Hydrogen Group IIA Propane
  • Group IIB Ethylene Group I Methane (firedamp)

FRANCE—INSTITUT NATIONAL DE L’ENVIRONNEMENT INDUSTRIEL ET DES RISQUES
Zones 0-2, Groups I, IIA, IIB, IIC

In Europe, CENELEC standard EN 50 014 defines the following zones:

  • Zone 0 Hazardous gas atmosphere is continuously present or is present for long periods of time (ia apparatus only)
  • Zone 1 Hazardous gas atmosphere is likely to occur during normal operation (ia or ib apparatus only)
  • Zone 2 Hazardous gas atmosphere is not likely to occur during normal operatings, or will only occur for short periods of time (ia or ib apparatus only)

Following are typical flammable gases, vapors, and mists. They are classified according to the spark energy required to ignite the most easily ignitable mixture with air.

  • Group IIC Acetylene, Hydrogen Group IIA Propane
  • Group IIB Ethylene Group I Methane (firedamp)