Bei Sensors DHO5S14/E2 Incremental Encoder

Sensors for Extreme Environments
Hazardous Area Products
BEI understands the challenges posed by extreme environments and has developed an extensive line of
products designed to operate in the harshest conditions imaginable. The icons below each represent a
particular environmental extreme. They are used in the product selection pages of this guide (pages 8–25) as
a quick visual indicator of which products are designed to operate in which extreme environment condition.
BEI Sensors offers a complete selection of UL and ATEX certified position sensing products. 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. The
tables on this page provide details on BEI Sensors products’ certifications. A variety of protection methods
are available. The four most common are described below.
Wet If a sensor has to operate in a liquid environment, it must have adequate sealing and the appropriate IP rating (as
Explosion Proof Construction
Intrinsic Safety
a measure of ingress protection) to guard against contamination. Products rated IPX5 are protected from “water jet” liquid
ingress. An IPX6 rating indicates protection from “powerful water jets.” An IPX7 rating means the product can be immersed
in water up to 1 meter for 30 second durations. BEI products with this icon are rated IPX6 or above.
•
Enclosure can 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 not ignite
gases outside the housing
• Must be connected using gas-tight conduit
•
Dirty/Dusty
BEI products with this icon are rated IP6X and are considered “dust tight,” meaning that they will
operate in the constant presence of dust. The majority of BEI products are rated to this level and this icon represents this
rating. Products with the lower IP5X rating are considered as only “dust protected,” which means that dust ingress is still
possible. IP5X rated products are recommended for environments where dust is only occasionally present.
Extended Temperatures
The majority of BEI Sensors products are rated to operate over a wide temperature range—typically 0 to +70°C. If your application requires operation in extreme temperatures (above or below
these ranges), BEI offers extended temperature options. Products with this icon have extended temperature ratings (beyond
their stated operating temperature) as a standard option.
High Shaft Load
For applications with shaft loading conditions it is best to use encoders over Hall effect
sensors or potentiometers. Encoders have internal bearing structures that can carry some load. In applications that use
gears or drive belts, excessive radial (side) loading of the shaft can shorten bearing life. Encoders should be specified in
accordance with the anticipated radial loading. Typical maximum loads for industrial encoders are 5 to 40 lbs (22 to 178 N).
Ultra heavy-duty encoders are available to withstand heavier loads. Encoders with this icon can withstand high shaft loads
in the range of 40 to 300 lbs (178 to 1335 N). See individual product data sheets to determine actual maximum load.
Corrosive or Washdown
A hard anodized finish is recommended for sensors intended to operate in
a corrosive environment. In food or medical-grade applications, where washdown may occur, an electroless nickel coating
or stainless steel housing is recommended. Products with this icon incorporate special finishes or housing material as a
standard option.
Hazardous Areas
Hazardous locations require equipment designed and certified to operate safely in
potentially explosive environments. Products with this icon have certification for one of the following: explosion-proof, flame
proof, intrinsically safe, or non-incendive. Refer to the next page for complete information on hazardous area certifications.
Shock and Vibration
The use of position sensors in high shock or vibration environments that are
not properly rated can result in output errors, reduced accuracy, or component failure. It is important to be aware of an
application’s expected shock and vibration and select a sensor rated for that environment. Products with this icon can
withstand greater than 100 g’s of shock or over 10 g’s of vibration. See individual product data sheets for maximum shock
and vibration ratings.
•
Rated for Division 1 or Zone 1 installations
Flame Proof Construction Enclosure can withstand internal ignition of volatile
gas-to-air mixtures without damage to the enclosure
• Allows for termination using a certified cable gland and cable
• Cannot be used for Division 1 hazardous areas
•
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) C (ethylene)
IIB (ethylene)
D (propane)
IIA (propane)
Nonincendive Assures no sparking or hot surfaces will occur in the device under
normal operating conditions (unlike intrinsically safe encoders which are evaluated under fault conditions)
• Acceptable in Division 2 and Zone 2 installations where explosive agents are present only in abnormal operating conditions
•
North American “Explosion Proof” & European “Flame Proof” Approvals C
F (coal)
Encoder Type
G (grain)
H38 (Standard) H38 (w/ Labyrinth Seal)
European “Flame Proof” Approvals
Encoder Type
CENELEC/ATEX Category 2, Zone 1 and 21
GAMX, GEMX, CAMX, CEMX
Ex d IIC T6
GAUX, GEUX, CAUX, CEUX, PAUX, PEUX
Ex d IIC T6
Encoder Type
Division 2, Groups:
H20, H25, HS25, ES20, ES25, HS35, HS45
A, B, C, D, F & G Ex nA II T4
US
NEMA 7 U.S., Canadian Standards Class II, Div 1, Group:
D
II 2 G Ex d IIB T4
C, D
H40
E, F, G
D
HS52
II 2 G Ex d IIB T4 Gb
C, D (US only)
SwiftComm
Ex d IIC
B, C, D
E, F, G
Encoders with metal connector or ­conduit terminations are rated to EN 55011 and EN 61000-6-2.
For ­plastic ­connector, ­pigtail or ­shielded/jacketed cable terminations, ­consult factory
North American and European "Intrinsic Safety" Approvals C
CENELEC/ATEX Zone 2
C
US
NEMA 7 U.S., Canadian Standards Class I, Div 1, Group:
CENELEC/ ATEX
North American and European “Nonincendive” Approvals
PHU9
8 | BEI Sensors | Product Selection Guide
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, not enough energy is supplied to or stored in the encoder which could create a spark or heated
surface to ignite gas, vapor, dust or fiber in the hazardous area
• Must be used with Intrinsically Safe (IS) barrier. An IS encoder installed
without an IS barrier is not an IS system.
US
Encoder Type
CENELEC/ATEX
U.S.,Canadian Standards Class I, Div1, Group:
H20, H25, ES20, ES25, H38, H40, HS20, HS25, HS35, HS45
Ex ia IIC T4
A, B, C, D
IBM5, IHM5, IHO5, IBO5, IHK5, IBK5, IHM9
Ex ia IIC T4
C
US
C
US
U.S., Canadian Standards Class II, Div 1, Group:
Canadian Standards Class I, Zone 0, Group:
E, F, G
IIC
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