DEVICE DESCRIPTION
2
11
DK37/M8 - H250/M8
www.krohne.com
11/2017 - 4002616802 - AD DK37 NEPSI Ex ia R02 en
2.7 Ambient temperature / temperature classes / product temperature
Due to the influence of the product temperature, variable area flowmeters with built-in electrical
equipment (electric variants) are not assigned to any fixed temperature class. In fact, the
temperature class of these devices is a function of the present product temperature and ambient
temperature, as well as the specific device version.
The classification is outlined in the following tables.
The tables take into account the following parameters:
•
installed equipment
•
Maximum values I
i
and P
i
for K1 and K2
•
Ambient temperature T
amb
•
Product temperature T
m
•
Heat resistance of the connecting cable
When using more than one installed equipment, the data of the most unfavourable equipment
should be used.
For certain device versions, lower values apply due to differing boundary conditions (e.g. liner
materials). Here the user should consult the technical data sheet.
The maximum product temperature is outlined in the following tables.
DK37/M8../../.. permissible product and ambient temperatures
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
•
The measuring device is installed and operated in accordance with the manufacturer's
installation instructions.
•
It must be ensured that the flowmeter is not heated by the effects of additional heat radiation
(sunshine, neighbouring system components) and thus operated above the permissible
ambient temperature range.
•
Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.
Temperature
class
Ambient temperature
up to
Maximum permissible product temperature / maximum value
Type DK37/M8E/..
Type DK37/M8M/..K.
at 64 mW
Type DK37/M8M/..K.
at 169 mW
[
°
C]
[
°
F]
[
°
C]
[
°
F]
[
°
C]
[
°
F]
[
°
C]
[
°
F]
T6
+40
+104
+70
+158
+85
+185
+40
+104
+50
+122
-
-
+85
+185
-
-
+60
+140
-
-
+75
+167
-
-
T5
+40
+104
+100
+212
+100
+212
+90
+194
+50
+122
+95
+203
+100
+212
+65
+149
+60
+140
+75
+167
+100
+212
-
-
+65
+149
-
-
+100
1
+212
2
-
-
