KROHNE DW 181-182-183-184 EN - Manual (Page 27)

Installation and operating instructions DW 181 - 184 27
Special conditions for ATEX applications
Flow indicator DW18* EEx d
Authorized markings:
II 1/2 GD EEx d IIC T…* IP65 T…°C**,***
Temperature Class Process temperature Ambient temperature range
T6 / T80°C or 175°F** T(fluid) ≤60°C or 140°F -40…+50°C or -40…+120°F
T5 / T95°C or 200°F** T(fluid) ≤80°C or 175°F -40…+50°C or -40…+120°F
T4 / T130°C or 265°F** T(fluid) ≤120°C or 250°F -40…+60°C or -40…+140°F
T3 / T195°C or 380°F** T(fluid) ≤150°C or 300°F -40…+80°C or -40…+175°F
Flow indicator DW18* EEx ia
Authorized markings: II 1 GD EEx ia IIC T…* IP65 T…°C**,***
Temperature Class Process temperature Ambient temperature range
T6 / T80°C or 175°F** T(fluid) ≤60°C or 140°F -40…+40°C or -40…+105°F
T5 / T95°C or 200°F** T(fluid) ≤80°C or 175°F -40…+40°C or -40…+105°F
T4 / T130°C or 265°F** T(fluid) ≤120°C or 250°F -40…+50°C or -40…+120°F
T3 / T195°C or 380°F** T(fluid) ≤150°C or 300°F -40…+80°C or -40…+175°F
* Maximum surface temperature of device
** T3, T4, T5 or T6 according to process temperature and ambient temperature
*** T195…80°C according to process temperature and ambient temperature
Viscosity
Standard mPa.s
lb/ft.s
≤30 or
≤20x10
-3
≤30 or
≤20x10
-3
≤30 or
≤20x10
-3
≤30 or
≤20x10
-3
Special version mPa.s
lb/ft.s >30 or
>20x10
-3
>30 or
>20x10
-3
>30 or
>20x10
-3
>30 or
>20x10
-3
Repeatability
(switching point) ±3% ±3% ±3% ±3%
Measuring accuracy
(Indicator A) ±15% ±15% ±15%
( ≤DN100, 4”)
–
Protection category IP 55 (standard version)
to EN 60529 / IEC 529 IP 44 (high-temperature version)
IP 65 (ATEX version)
Electromagnetic
compatibility (EMC) EN 50081-1 and 50082-2
Limit switches
Type
Number and description
K1 1 N/C* or 1 N/O* switch (bistable) or 3-wire SPDT (change over)
K2 1 N/C* or 1 N/O* switch (bistable) or 3-wire SPDT (change over)
2 N/C* or 2 N/O* switches also possible in conjunction with high-
temperature version H3
KV1, KV2 1,2 changeover switches (bistable) with amplifier relay
Type Max. switching capacity rating
K1, K2 (standard) max. 14 VA (max. 350 V AC; max. 0.4 A)
K1, K2 with changeover max. 3 VA (max. 28 V DC; max. 0.25 A)
EEx d characteristics
max. dissipation (Ex d housing): 20 VA; max. 380 V AC; max. 1.5 A
EEx ia safety values Ii < 500 mA, Ci = 0 nF, Li = 0 µH
Reed switch, HT 18 VA (max. 220 V; max. 0.8 A)
KV1, KV2 max. 2000 VA (max. 250 V AC, max. 8 A)
Amplifier relay characteristics
Power supply
240/110/48/24 V AC, 110/48/24 V DC
Response time 5…12 ms
* Refer to section 2: Electrical connections for definition.