KROHNE OPTITEMP TCA Ex EN - Manual (Page 9)

DEVICE DESCRIPTION
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OPTITEMP TRA/TCA
www.krohne.com 10/2010 - 4001087001 - Ex AD OPTITEMP TRA/TCA R02 en
2.6 Protection types
2.6.1 Protection type with zone separator for gas hazard areas
In protection type "intrinsic safety" the industrial thermometer meets the requirements of
EN 60079-11. The explosion protection is guaranteed because the current and voltage are
limited so that ignitable energy cannot occur.
If zone 0 and zone 1 are separated as per EN 60079-26, this will ensure that a thermowell is
fitted properly. In such cases the thermometer marking is:
II 1/2G Ex ia IIC T6 II 1/2G Ex ia IIC T6 II 1/2G Ex ia IIC T6 II 1/2G Ex ia IIC T6
Components of the Ex marking and what they mean
2.6.2 Type of protection for gas hazard areas
In protection type "intrinsic safety" the industrial thermometer meets the requirements of
EN 60079-11. The explosion protection is guaranteed because the current and voltage are
limited so that ignitable energy cannot occur. In such cases the thermometer marking is:
II 1G Ex ia IIC T6 II 1G Ex ia IIC T6 II 1G Ex ia IIC T6 II 1G Ex ia IIC T6
Components of the Ex marking and what they mean
II IIII II Group II explosion protection
1/2 1/2 1/2 1/2 Equipment category 1/2
G G G G Gas explosion protection
Ex ia Ex ia Ex ia Ex ia Intrinsically safe equipment
IIC IIC IIC IIC Gas groups IIA, IIB, IIC
T6 T6 T6 T6 Temperature classes T6...T1
II IIII II Group II explosion protection
1111 Equipment category 1
G G G G Gas explosion protection
Ex ia Ex ia Ex ia Ex ia Intrinsically safe equipment
IIC IIC IIC IIC Gas groups IIA, IIB, IIC
T6 T6 T6 T6 Temperature classes T6...T1
.book Page 9 Friday, November 19, 2010 2:23 PM