Surface Temperature For Equipment Protection Level Db; Electrical Data - KROHNE DK37/M8 Series Supplementary Instructions Manual

DEVICE DESCRIPTION
2
The permissible ambient temperature range is indicated on the nameplate; depending on the
device version it is
T = -40...+65°C / -40...+149°F or T
amb
The permissible minimum product temperature is -40°C / -40°F.
Type
DK37/M8E/../..
DK37/M8M/../..
DK37/M8M/../..
DK37/M8M/../..
Table 2-4: Minimum permissible ambient temperature depending on electrical built-ins

2.8 Surface temperature for equipment protection level Db

For use in areas with flammable dust it should be noted that the indicated maximum surface
temperature of T75°C at an ambient temperature of +65°C / +149°F and a product temperature
of +75°C / +167°F is valid without a dust coating.
For higher product temperatures the maximum surface temperature is defined by the product.

2.9 Electrical data

Built-in equipment for the variable area flowmeter may only be connected to separate
intrinsically safe circuits with the following maximum values:
Device version
DK37/M8E/../..
DK37/M8M/../..
SC2-N0...
DK37/M8M/../..
SJ2-SN
DK37/M8M/../..
I7S2002-N
Table 2-5: Maximum values for intrinsically safe circuits
WARNING!
Also, when operating the variable area flowmeter outside of the hazardous area, the connection
must be made to an intrinsically safe circuit.
When connecting to non-intrinsically safe circuits, there is a risk of damage to the safety-
defining components.
12
= -25...+65°C / -13...+149°F.
amb
Electrical built-ins
Signal output 4...20 mA
SC2-N0
I7S2002-N
SJ2-SN
Without electrical built-ins
Maximum values
U [V]
i
30
16
16
16
www.krohne.com
Min. ambient temperature
-40°C / -40°F
-25°C / -13°F
-40°C / -40°F
-40°C / -40°F
I [mA] P [mW]
i i
120 1000
25 64
52 169
25 64
52 169
25 64
52 169
03/2019 - 4007510401 - AD DK37/M8 Exi INMETRO R01 en
DK37/M8
C [nF] L [μH]
i i
0 ~ 0
165 150
45 100
165 120