2
TEMPERATURE LIMITS
20
OPTIFLUX
www.krohne.com
07/2010 - 7309482600 - AD EX IFC 300 R06 en
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")
DN25...150 ("d")
DN200...300 ("qe")
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
T4
130
115
75
T3
150
115
75
Temperature class
Max. process temperature Tp [
°
C]
T
a
≤
40
°
C
40 < T
a
≤
50
°
C
50 < T
a
≤
60
°
C
T6
70
70
70
T5
85
85
85
T4
120
120
120
T3
180
180
180
Use heat resistant
cables for T
p
above:
1
Not needed
155
105
1
Cables must withstand a continuous operating temperature of 85
°
C.
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
T4
130
115
75
T3
150
115
75
