Meggitt (Sensorex) offers a wide range of Intrinsically Safe (IS) LVDT & RVDT sensors, signal conditioners and inertial systems, ATEX certified, for explosive atmosphere applications.

Introduction to ATEX regulations

The European directive applied by Meggitt (Sensorex) is the 94/9/CE directive for equipments which are intended for ATEX zone applications.

These ATEX zones are subdivided into 6 specific zones, dependent on the product exposure degree to gaseous or dusty atmosphere:

  • Zone 0 : permanent presence of the explosive gaseous atmosphere (> 1000h / year)
  • Zone 1 : occasional presence of the explosive gaseous atmosphere (10h<x<1000h / year)
  • Zone 2 : rare presence of the explosive gaseous atmosphere (< 10h / year)
  • Zone 20 : permanent presence of the explosive dusty atmosphere (> 1000h / year)
  • Zone 21 : occasional presence of the explosive dusty atmosphere (10h<x<1000h / year)
  • Zone 22 : rare presence of the explosive dusty atmosphere (< 10h / year)

Marking specifying equipment conformity is broken down into three parts:

  • First part indicates the using place (II for surface industries)
  • The second part indicates the category (1 for devices used in 0/20 zones, 2 for devices used in 1/21 zones and 3 for devices used in 2/22 zones)
  • The third part indicates the zone type (G for gaseous zones (0,1,2), D for dusty zones (20,21,22))

Meggitt (Sensorex) intrinsically safe products have an additional marking enabling the protection mode identification:

  • The first part confirms that the device is in accordance with the European standard (Ex code corresponds to the explosive protection standard)
  • The second part is made up of « ib » or « ia » letters, for the intrinsically safe. Meggitt (Sensorex) devices are “ia” qualified (type a intrinsically safe)
  • The third part indicates the gas group :

I = methane

IIA= propane

IIB= ethylene

IIC= dihydrogen and acetylene

Note: Meggitt (Sensorex) products are not qualified for gas I group as this is not applicable for surface industries.

  • The fourth part is the maximal surface temperature :

T1= 450°C

T2= 300°C

T3= 200°C

T4= 135°C

T5= 100°C

T6= 85°C

Meggitt (Sensorex) intrinsically safe products

  • LVDT sensors, 12mm diameter and cable output
  • Rugged LVDT sensors, with swivel joints
  • RVDT sensors, 36mm diameter
  • Signal conditioners for LVDT and RVDT sensors
  • Inclinometers and accelerometers