DW 18 SERIES
28Pages

Catalog excerpts

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 / 570°F

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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. • Proven technology - for more than thirty years • Bistable reed switches, SPDT switches and relays • Optional second limit switch • Switch position can be adjusted under process • High-temperature version (without indicator) for • Housing is removable under process conditions • Optional...

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The DW 181 inline flow controller is suitable for horizontal orvertical pipes. It can have G or NPT threaded connections, sizes ranging from %...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 tables. The DW 182 inline...

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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 21/4...8". The measuring tube and connection is made of eitherXC 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 • a dial (as shown) which has been made specifically for this instrument and tested on a For...

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Indicator options Standard and intrinsically-safe flow switches are equipped with a local indicator. There are two types: O The type G linear indicator is supplied as standard for all vari- ants. 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. 0 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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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 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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Technical data: inline instruments Installation type Inline connection Measurement accuracy Operating conditions

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Installation conditions Process connections

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© Not available for EEx d and HT options. For connection sizes DN <100 or <4" only. © With type A dial only 0 With type A dial only © See flow range tables 0 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 © no indicator available for the EEx d version. EEx approval not available for the high-temperature option. Refer also to the "Switch op- tions" page.

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Technical data: insertion-type instruments Installation type Insertion-type connection for pipe diameters >DN250 or 10" Measurement accuracy Operating conditions

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Installation conditions Process connections Power supply Instrument terminal Refer to the "Switch options" page O No indicator available for the EEx d version. EEx approval not available for the high-temperature option. Refer also to the "Switch op- tions" page.

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Switch options The DW 18 series has a large number of switch and relay options. The DW 18 series can be equipped with either: 1 or 2 SPST (single pole, single throw) switches for standard applications, 1 or 2 SPST switches for high-temperature (HT) applications, 1 SPDT (single pole, double throw) switch, or 1 or 2 DPDT (double pole, double throw) relay amplifiers for higher switching capacities. The normal state of an SPST switch is either N/C, normally closed, or N/0, normally open. N/C switches are closed during operation (closed when flow increases). N/0 switches are open during...

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Power supply O With high-temperature (HT) option. EEx approvals are not available.

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Flow range tables Use the tables that follow for the selection of devices and their flow range. Quote the code given. O only with indicator G

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O only with indicator G

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DW 184 flow velocity ranges O mounting flange size for insertion-type flow controller. For process pipes diameters >250 mm/10" in diameter.

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DW181 non-Ex/Exi side view • The customer must supply cable glands for EEx d-approved flow controllers with Aluminium housings. The standard size for the cable entry is M20 x 1.5. M25 x 1.5 and NPT VA cable entries are also available • Standard and EEx i-approved flow controllers have PG 13.5 cable glands. • High-temperature flow controllers have PG 9 cable glands.

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DW 182 non-Ex / Exi side view

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DW 184 non-Ex/Exi side view O mounting flange size for DW 184 insertion-type flow controller. For process pipe diameters O mounting flange size for DW 184 insertion-type flow controller. For process pipe diameters

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