KROHNE OPTIFLUX 2000-4000-5000-6000-7300-IFC 300 Ex EN - Manual (Page 18)

2
TEMPERATURE LIMITS
18
OPTIFLUX
www.krohne.com 07/2010 - 7309482600 - AD EX IFC 300 R06 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 2300 C / 4300 C is suitable for an ambient temperature range of
-40…+60°C.
• For dust hazardous areas, the maximum surface temperature is equal to the process
temperature with a minimum of 85°C.
• The minimum process temperature for all DN sizes is -40°C.
• The maximum process temperature is determined by the temperature class T6/T5...T3 of the
gas hazardous area of concern, the maximum ambient temperature (T
a
), and the nominal
diameter. The temperature range is often limited further by the liner type used (refer to the
Quick Start).
DN2.5...15 ("me")
DN10...20 ("me")
Temperature class Max. process temperature Tp [°C]
T
a
≤ 40°C 40 < T
a
≤ 50°C 50 < T
a
≤ 60°C
T6 70 70 60
T5 85 85 60
T4 120 120 60
T3 150 140 60
Temperature class Max. process temperature Tp [°C]
T
a
≤ 40°C 40 < T
a
≤ 50°C 50 < T
a
≤ 60°C
T6 70 60 -
T5 95 85 60
T4 130 130 60
T3 150 150 1 60
1 140°C for versions with stainless steel converter housing