KROHNE OPTIFLUX 2000-4000-5000-6000 -IFC 100 Ex EN - Manual (Page 12)

2
TEMPERATURE LIMITS
12
OPTIFLUX
www.krohne.com 04/2009 - 7.30685.22.00 - EX IFC 100 en
The temperature limits apply under the following conditions:
• The instrument is installed and operated in accordance with the installation directions given
in the installation and operating instructions.
• The instrument is not heated up by any additional heat radiation (direct solar radiation, heat
from adjacent plant parts) so causing it to operate above the permissible ambient
temperature range.
• Insulation is not hindering free ventilation of the signal converter housing.
2.1 OPTIFLUX 2000 / 4000
2.1.1 Compact versions
• The OPTIFLUX 2100 C / 4100 C is suitable for an ambient temperature range of -20…+40°C.
• For dust hazardous areas, the maximum surface temperature is 120°C.
• The minimum process temperature for all DN sizes is -20°C.
• The maximum process temperature is determined by the temperature class T4 or T3 of the
gas hazardous area of concern and the type of protection of the coil housing. The
temperature range is often limited further by the liner type used (refer to the Quick Start).
DN10...20 ("mb"), DN25...150 ("d"), DN200...300 ("q") and DN350...3000 ("e")
DN25...150 ("q")
2.1.2 Field versions
• In general the OPTIFLUX 2000 F / 4000 F flow sensors are suitable for an ambient
temperature range of -40...+60°C.
• For dust hazardous areas the maximum surface temperature is equal to the process
temperature T
p
with a minimum of 85°C.
• The minimum process temperature is -40°C.
• The maximum process temperature Tp is dependent on the required temperature class
T6/T5...T3, the diameter and the maximum ambient temperature T
a
. The temperature range
is often limited further by the liner type used (refer to the Quick Start).
DN10...20 ("me")
Temperature class Max. process temperature Tp [°C]
T
a
≤ 40°C
T4 120
Temperature class Max. process temperature Tp [°C]
T
a
≤ 40°C
T4 100
T3 120
Temperature class Max. process temperature Tp [°C]
T
a
≤ 40°C 40 < T
a
≤ 50°C 50 < T
a
≤ 60°C
T6 75 70 70
T5 95 90 75