14
FMT230, FMT250
THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
… 3 Use in potentially explosive atmospheres in accordance with FM and CSA
… Temperature data
Measuring medium temperature (Ex data) for model FMT2x0-F1… in Class I Division 1 and Class II Division 1
The table shows the maximum permissible measuring medium temperature as a function of ambient temperature and temperature
class. The permissible measuring medium temperature specified in
Environmental and process conditions for model FMT2xx…
on
page 13 must not be up-scaled!
Temperature class
Ambient temperature T
amb.
T1
T2
T3
T4
T5
T6
−
40 °C to 40 °C
(−40
°F to 104 °F)
280 °C (536 °F)
185 °C (365 °F)
90 °C (194 °F)
90 °C (194 °F)
—
—
−
40 °C to 50 °C
(−40
°F to 122 °F)
280 °C (536 °F)
185 °C (365 °F)
90 °C (194 °F)
90 °C (194 °F)
—
—
−
40 °C to 60 °C
(−40
°F to 140 °F)
280 °C (536 °F)
185 °C (365 °F)
90 °C (194 °F)
90 °C (194 °F)
—
—
−
40 °C to 70 °C
(−40
°F to 158 °F)
280 °C (536 °F)
185 °C (365 °F)
90 °C (194 °F)
90 °C (194 °F)
—
—
Measuring medium temperature (Ex data) for model FMT2x0-F1… in Class I Division 2 and Class II Division 2
The table shows the maximum permissible measuring medium temperature as a function of ambient temperature and temperature
class. The permissible measuring medium temperature specified in
Environmental and process conditions for model FMT2xx…
on
page 13 must not be up-scaled!
Temperature class
Ambient temperature T
amb.
T1
T2
T3
T4
T5
T6
−
40 °C to 40 °C
(−40
°F to 104 °F)
300 °C (572 °F)
290 °C (554 °F)
195 °C (383 °F)
130 °C (266 °F)
95 °C (203 °F)
80 °C (176 °F)
−
40 °C to 50 °C
(−40
°F to 122 °F)
300 °C (572 °F)
290 °C (554 °F)
195 °C (383 °F)
130 °C (266 °F)
95 °C (203 °F)
—
−
40 °C to 60 °C
(−40
°F to 140 °F)
300 °C (572 °F)
290 °C (554 °F)
195 °C (383 °F)
130 °C (266 °F)
—
—
−
40 °C to 70 °C
(−40
°F to 158 °F)
300 °C (572 °F)
290 °C (554 °F)
195 °C (383 °F)
130 °C (266 °F)
—
—
Notice on dust-ignition protection for USA and Canada in accordance with NEC
The surface temperature of the device must not under any circumstances up-scale 85 °C (185 °F) if there is there carbonaceous dust
or dust which can carbonate.
Attention, T-Class for Dust US and Canada information according NEC/CEC:
The maximum temperature cannot exceed 165 °C under any circumstances where a carbonaceous dust or dust likely to carbonize is
present.
• For combustible dusts, less than the lower of either the layer or cloud ignition temperature of the specific combustible dust. For
organic dusts that may dehydrate or carbonize, the temperature marking shall not exceed the lower of either the ignition
temperature or 165 °C (329 °F).
• For ignitible fibers/flyings, less than 165 °C (329 °F) for equipment that is not subject to overloading, or 120°C (248°F) for
equipment (such as motors or power transformers) that may be overloaded.
