By TypeOptical Rotary Encoders Magnetic Rotary
Encoders
Hall Effect Sensors PotentiometersDraw Wire Solutions Inclinometers Electronic Modules SwiftComm Wireless
Encoder Interface
Sensor Support Products Encoder Model
Comparison
Crossover Library
By CertificationATEX and UL Hazardous
Area Certified
PL and SIL Functional
Safety
By ModelModel or Series

Hazardous Area Encoder Products

Encoders for hazardous locations

Hazardous locations require encoders, position sensors and other motion control equipment to be designed and certified to operate safely in potentially explosive environments. Flammable gas, vapor, dust or fiber can be ignited by internal electronics in the equipment if it is not properly protected.

Encoder Products for Hazardous area industrial conditions BEI Sensors offers a complete selection of UL and ATEX certified encoders for hazardous areas. Certifications include UL Class I Division 1 and 2, and Class II Division 1 and 2, as well as ATEX Zone 1 and Zone 2. Encoder products with this icon have hazardous area certification for one of the following: explosion-proof, flame proof, intrinsically safe, or non-incendive.

The tables on this page provide details on BEI Sensors products' certifications. A variety of protection methods is available. The four most common are described below.

Explosion Proof

  • The enclosure of the encoder is designed to withstand internal ignition and contain the explosion without damage to the enclosure.
  • Heated gases from an explosion that pass through gaps or joints in the assembly will be cooled sufficiently to prevent ignition of gases outside the housing
  • Must be connected using gas-tight conduit
  • Rated for Division 1 or Zone 1 installations

Flame Proof

  • The enclosure of the encoder can withstand internal ignition of volatile gas-to-air mixtures without damage to the enclosure
  • Allows for termination using a certified cable glandand cable

Intrinsic Safety

  • Limits the maximum energy that can be delivered into the hazardous location
  • Has limitations on the amount of energy that can be stored within the body of the device
  • Ensures that - even in double fault condition - the energy that is supplied to or stored in the encoder will not create a spark or heat the surface in a way that would ignite gas, vapor, dust or fiber in the hazardous area
  • Must be used with Intrinsically Safe (IS) barrier. NOTE: An IS encoder installed without an IS barrier is not an IS system; in other words, an Intrinsically Safe encoder requires the concomitant use of an Intrinsically Safe barrier.

Nonincendive

  • Assures no sparking or hot surfaces will occur in the encoder under normal operating conditions
  • Acceptable in Division 2 and Zone 2 installations where explosive agents are present only in abnormal operating conditions

back to top

ATEX and UL Hazardous Area Certified

North American "Explosion Proof" & European "FlameProof" Approvals

North American and European "Intrinsic Safety" Approvals

North American and European "Nonincendive" Approvals

Hazardous Environment Groups

Gas Groups Dust Groups
Class I Class II
Division 1 & 2 Zone 0, 1 & 2 Division 1 & 2
A (acetylene) IIC (acetylene &
hydrogen)
E (metals)
(Div 1 only)
B (hydrogen)   F (coal)
C (ethylene) IIB (ethylene) G (grain)
D (propane) IIA (propane)  

North American "Explosion Proof" & European "Flameproof" Approvals

 
Encoder Type Encoder ATEX certified
CENELEC/ATEX
Encoders cUL and UL certified
U.S./Canada Class I, Div 1, Group:
Encoders cUL and UL certified
U.S./Canada Class II, Div 1, Group:
IECEX
IECEx

H38

D

   
H38
(w/ Labyrinth Seal)
II 2 G Ex d IIB T4
C, D E, F, G
Ex d IIB T4

H40

D

   
HH-X, AH-X
II 2 G Ex d IIB T4 Gb
IP66
C, D  
Ex d IIB T4 Gb
IP66

CAMXCAUX, CEMX
CEUX, GAMX, GAUX,
GEMX, GEUX, PAUX,
PEUX, NAUX, NEUX, PAMX, PEMX, SAUX, SEUX

II 2
Ex d IIC T6 Gb
Ex tb IIIC T80 °C
Db IP 6x

    Ex d IIC T(*) Gb
Ex tb IIIC T(*)°C Db
CEUX, GEUX, NEUX, PEUX

I M2
Ex d I Mb

   
Ex tb IIIC T(*)°C Db
Ex d I Mb

North American and European "Intrinsic Safety" Approvals

Encoder Type Encoder ATEX certified
CENELEC/ATEX
Encoders cUL and UL certified
Class I, Group:
Encoders cUL and UL certified
Class II, Group:
IECEX
IECEx

H20, H25, HS20,
HS25, HS35,
HS45, HH-9,

II 1 G Ex ia IIB/IIC T4 Ga

A, B, C, D

E, F, G

Ex ia IIB/IIC T4
IBM5, IHM5, IHO5, IBO5,
IHK5, IBK5, IHM9, IBM9
II 1 G
Ex ia IIC T4 Ga
or EX ia IIB T4 Ga
   
Ex ia IIC T4 Ga
Ex ia IIB T4 Ga

IXM5, IXO5

I M1
Ex ia I Ma

     
Approved Associated Apparatus
Intrinsic Safety Barrier II (1) G [EX ia] IIC A, B, C, D   Ex nA [ia Ga] IIc T4 Gc

North American and European "Nonincendive & Non-Sparking" Approvals

Encoder Type Encoders Division 2 certified
Division 2, Groups:
Encoder ATEX certified
CENELEC/ATEX
Zone 2/22
IECEX
IECEx

H20, H25, H25X, HS20, HS25, HS35, HS45, HH_9, HH_B, AH_9, AH_B

A, B, C, D, F & G

II 3 G
Ex nA IIB T3 Gc
Ex nA IIB T4 Gc

Ex nA IIB T3 Gc
Ex nA IIB T4 Gc
PHU9, PBU9   II 3 G Ex nA
Ex nA IIC T6 Gc
 

DHM5, DHK5, DHO5, KHM5, KHO5, KHK5

 

II 3 G D
Ex nA IIC T6...T4 Gc
Ex tc IIIC T120°C...T80°C Dc

Ex nA IIC T6...T4 Gc
Ex tc IIIC T120°C...T80°C Dc
*Certifications Pending

Additional Resources

 Article: Drilling deeper — can position sensors take the heat?

 Article: Specifying Encoders for Hazardous Locations

 Article: Nonincendive and non-sparking encoders for Division 2 and Zone 2

back to top

Get Adobe Reader

Web Analytics