DW 181
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Catalog excerpts

DW 181 - 1

Technical Datasheet Mechanical Flow Controller • Mechanical, autonomous flow switches - no power supply needed • For horizontal and vertical pipes from DN 15 up to DN 3000 - and higher • High reliability and repeatability up to 300°C / 5

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DW 181 - 2

The Mechanical Flow Controller The DW 18 series of flow controller is ideal for locally indicating the flow of homogenous clean liquids. Adjustable switches generate alarms once switching points are reached. The units are robust. Several variants are available to suit a wide variety of applications. Highlights • Proven technology - for more than thirty years • Bistable reed switches, SPDT switches and relays available • Optional second limit switch • Switch position can be adjusted under process conditions diameter High-temperature version (without indicator) for operating conditions up to...

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DW 181 - 3

DW 181 flow controller The DW 181 inline flow controller is suitable for horizontal or vertical pipes. It can have G or NPT threaded connections, sizes ranging from ¾...2". The measuring tube and connection are made of either bronze or 316 L (1.4404) stainless steel. There are two types of indicator available for this variant: • a linear scale with up to two alarm positions at the top and bottom of the indicator (as shown) or • a dial which has been made specifically for this instrument and tested on a calibration rig. For information on DW 181 flow ranges, please refer to the flow range...

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DW 181 - 4

DW 183 flow controller The DW 183 inline flow controller is suitable for horizontal or vertical pipes. It has with flanged connections , sizes ranging from DN 65...DN 200 and 2½...8". The measuring tube and connection is made of either XC 18 (1020) carbon steel or 316 L (1.4404) stainless steel. Carbon steel flanges with nominal diameters bigger than 100 or 4" can have 316 L stainless steel cladding. There are two types of indicator available for this variant: • a linear scale with up to two alarm positions at • the top and bottom of the indicator or a dial (as shown) which has been made...

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DW 181 - 5

Indicator options Standard and intrinsically-safe flow switches are equipped with a local indicator. There are two types: 1 The type G linear indicator is supplied as standard for all variants. Up to two switching points (alarm positions) are indicated at the top and the bottom of the indicator. The switching points are set according to customer order and tested on a calibration rig. Switching points can be changed during operation. 2 The type A dial indicator is optional for the DW 181, DW 182 and DW 183. It has been made specifically for the instrument and tested on a calibration rig....

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DW 181 - 6

ATEX approval: explosion-proof devices The DW 18 explosion-proof (EEx d) flow switch has an aluminium housing without an indicator. It is suitable for use in potentially explosive atmospheres. It is possible to change the switch position under process conditions. A DW 18 with this option is in equipment category 1/2 GD. High-temperature (HT) option The DW 18 high-temperature (HT) flow switch is suitable for operating conditions up to 300°C / 570°F. It does not have an indicator. The switch is sheathed in a PTFE cartridge. It is possible to change the switch position under process conditions.

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DW 181 - 7

Technical data: inline instruments DW 181 Functions Description Flow switch Monitors flow in horizontal or vertical pipes User interface options Linear scale (type G) 1 Dial (type A) 1 Scale marking options Design Installation type Inline connection Measurement accuracy Repeatability Reference temperature Reference pressure 1013 mbar abs. ±20 mbar / 14.69 psig ±0.29 psig Reference relative humidity Reference product Measuring range Operating conditions Ambient temperature Standard housing -40…+80°C / -40…+175°F (EEx: see supplementary operating instructions or approval certificates) EEx:...

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DW 181 - 8

DW 181 Dangerous fluids (Group 1, Regulation (EC) No 1272/2008) DW 183 with DN150 PN16 flanges: <13 bar or 190 psig with DN80 PN40 flanges: <25 bar or 362 psig Viscosity, standard variants Viscosity, special variants Protection category acc. to EN 60529 Standard variants High-temperature option Installation conditions Minimum inlet run 5 x nominal diameter, depending on the flow profile 2 x nominal diameter, depending on the flow profile Materials Measuring tube Measuring system assembly Housing - non-Ex/Ex I versions Switch sheath - HT version Electric cable sheath - HT version XC 18...

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DW 181 - 9

Power supply Instrument terminal Refer to the "Switch options" page Input and output Parameter Flow rate Output signal Refer to the "Switch options" page Not available for EEx d and HT options Not available for EEx d and HT options. For connection sizes DN 100 or 4" only. With type A dial only With type A dial only See flow range tables NPT connections: 316 L (1.4404) stainless steel only Carbon steel flanges with nominal diameters bigger than 100 mm or 4" can have stainless steel cladding PN16 on request no indicator available for the EEx d version. EEx approval not available for the...

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DW 181 - 10

Technical data: insertion-type instruments DW 184 Functions Description Flow switch Monitors flow in horizontal or vertical pipes User interface options Linear scale (type G) - not available for EEx d and HT options Design Installation type Insertion-type connection for pipe diameters DN250 or 10" Measurement accuracy Repeatability Reference temperature Reference pressure 1013 mbar abs. ±20 mbar / 14.69 psig ±0.29 psig Reference relative humidity Reference product Measuring range 0.2…4 m/s / 0.66…1.31 ft/s, see flow range tables Operating conditions Ambient temperature Standard housing...

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DW 181 - 11

Installation conditions Minimum inlet run 5 x nominal diameter, depending on the flow profile 2 x nominal diameter, depending on the flow profile Mounting flange clearance above pipeline Materials Measuring tube Measuring system assembly Connection XC 18 (1020) steel; SS 316 L (1.4404); SS 316 L (1.4404)-clad carbon steel Housing - non-Ex/Ex I versions Wiring box - HT version Switch sheath - HT version Electric cable sheath - HT version Fibre glass Gasket Standard Perbunan; FKM/FPM; Silicone; Klingerit Process connections Flange, DIN 2526 - PN40 - Form C Flange, DIN 2526 - PN16 - Form C...

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