KROHNE OPTITEMP TCA Ex EN - Manual (Page 10)

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DEVICE DESCRIPTION
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OPTITEMP TRA/TCA
www.krohne.com 10/2010 - 4001087001 - Ex AD OPTITEMP TRA/TCA R02 en
2.6.3 Type of protection for dust hazard areas
In protection type "Protection through instrinsic safety" the industrial thermometer meets the
requirements of EN 61241-11. The dust protection is guaranteed by housing which provides
appropriate protection against penetration by dust. Current and voltage are also limited so that
ignitable energy cannot occur. All thermometers with these features have the following
marking:
II 1D Ex iaD 20 IP65 T140 II 1D Ex iaD 20 IP65 T140 II 1D Ex iaD 20 IP65 T140 II 1D Ex iaD 20 IP65 T140°C C C C
Components of the Ex marking and what they mean
II 1D Ex iaD 20 IP65 T175 II 1D Ex iaD 20 IP65 T175 II 1D Ex iaD 20 IP65 T175 II 1D Ex iaD 20 IP65 T175°C C C C
Components of the Ex marking and what they mean (TxA-P14)
II IIII II Group II explosion protection
1111 Equipment category 1
D D D D Dust explosion protection
Ex ia D Ex ia D Ex ia D Ex ia D Dust protection type intrinsic safety "iaD"
20 20 20 20 Use in zone 20
IP65 IP65 IP65 IP65 Foreign bodies and water pollution control
T140 T140 T140 T140°C C C C Maximum surface temperature of industrial thermometer without dust coating at ambient
temperature 100°C / 212°F and product temperature 100°C / 212°F
DANGER!
As the TxA-P14 model does not have a thermowell, you must allow for a higher maximum
surface temperature! The marking is therefore:
II IIII II Group II explosion protection
1111 Equipment category 1
D D D D Dust explosion protection
Ex ia D Ex ia D Ex ia D Ex ia D Dust protection type intrinsic safety "iaD"
20 20 20 20 Use in zone 20
IP65 IP65 IP65 IP65 Foreign bodies and water pollution control
T175 T175 T175 T175°C C C C Maximum surface temperature of industrial thermometer without dust coating at ambient
temperature 100°C / 212°F and product temperature 100°C / 212°F
.book Page 10 Friday, November 19, 2010 2:23 PM