NIVELCO MicroTREK HB, User And Programming Manual, Page: 15 / 68

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3.1.5. Temperature data for ex certified models
Temperature limit data for ATEX and IECEx approvals
Temperature data
Explosive gas atmosphere Explosive dust atmosphere
Aluminium and stainless-steel housing
H  –  –8Ex
Aluminium and stainless-steel housing
H  –  –5, –6Ex
High temperature High temperature
HH  –  –8Ex
HP  –  –8Ex
HH  –  –6Ex
HP  –  –6Ex
Ex ia IIC, Ex ia IIB Ex ia IIIC, Ex ta/tb IIIC
Maximum permissible medium temperature
+80 °C
(+176 °F)
+90 °C
(+194 °F)
+100 °C
(+212 °F)
+180 °C
(+356 °F)
+80 °C
(+176 °F)
+90 °C
(+194 °F)
+100 °C
(+212 °F)
+180 °C
(+356 °F)
Maximum permissible surface temperature at
the process connection
+70 °C
(+158 °F)
+90 °C
(+194 °F)
+100 °C
(+212 °F)
+175 °C
(+347 °F)
+75 °C
(+167 °F)
+90 °C
(+194 °F)
+100 °C
(+212 °F)
+175 °C
(+347 °F)
Maximum permissible ambient temperature
≤ 60 °C ( ≤ 140 °F)
Temperature class
T6 T5 T4 T3 T85°C T100°C T110°C T180°C
Temperature limit data for IECEx and INMETRO approvals
Temperature data
Explosive gas atmosphere Explosive dust atmosphere
Aluminium housing
H

–4

–8Ex
Aluminium housing
High temperature
HT  –4  –6Ex
HB

–4

–6Ex
HH  –4  –8Ex
HP  –4  –8Ex
Ex ia IIC, Ex ia IIB Ex ia IIIC
Maximum permissible medium temperature
≤ 85 °C
( ≤ 185 °F)
≤ 100 °C
( ≤ 212 °F)
≤ 135 °C
( ≤ 275°F)
≤ 200 °C
( ≤ 392 °F)
+90 °C
(+194 °F)
Maximum permissible ambient temperature
≤ 60 °C ( ≤ 140 °F)
Temperature class
T6 T5 T4 T3 T100°C