DLS-27 Capacitive Level Switches Riels® Instruments - 7 Pages

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DLS-27 Capacitive Level Switches Riels® Instruments

Catalog excerpts

CAPACITIVE LEVEL SENSOR LEVEL CONTROLS Capacitive level sensors DLS – 27 All data and contents of this card are the exclusive property of Riels Instruments Capacitive level sensors (switches) Riels DLS® are designed for limit level sensing of liquids, bulky solid and powder materials in vessels, containers, silos, tanks, reservoirs, etc. Sensors are made in several modifications of sensing electrodes - short and long rods or rope. The electrodes can be coated what has important sense in case of adhesive, aggressive or electrically conductive media sensing. The process coupling at the housing can be with thread M27x2, M30x1.5, G3/4" or with Tri-clamp coupling. Electric connection is provided by means of permanent cable lead (variant B) or by means of connector (variant C). Output performances - transistor outputs with open collector (NPN, PNP) - or NAMUR output. There are next performances available: N – for normal atmospheres, Xd – for use in flammable dust atmospheres, Xi – explosion proof - intrinsically safe for hazardous (explosive) areas, XiM – explosion proof - intrinsically safe for use in mines with methane or flammable dust presence danger (see technical specifications). • For limit level sensing of liquid, and bulk-solid and powder materials • Xi version for usage in explosive areas • Direct mounting into various containers, silos, vessels, tanks, filling inlets, reservoirs, etc. • Sensitivity and hysteresis fluently adjustable • NPN, PNP, NAMUR output (EN 60947-5-6) • Material of housing and electrode from stainless steel Uncoated short bar electrode for sensing non-adhesive bulk-solid (powder) materials (sand, sugar) and electrically non-conductive liquids (oils, diesel, petrol), horizontal mounting. Electrode length 50 mm or 100 mm. Fully coated short bar electrode for sensing electrically conductive liquids (water). Assembly into a side wall of vessel or into a pipe. Electrode length 30 mm. Semi-coated rod electrode for sensing light-bulk solid or powder materials (plastic granulates, flour, cement) and non-conductive liquids (plant oils), horizontal, slant or vertical mounting. Electrode length from 0.1 m to 1 m. Fully coated rod electrode for sensing electrically conductive liquids (water solutions, water), adhesive and aggressive materials, horizontal or vertical mounting. Electrode length from 0.1 m to 1 m. Dismountable rod uncoated electrode for sensing bulk-solid (powder) materials and conductive or non-conductive liquids. Mounting from the top (vertically) or slant from the side. Electrode length from 0.1 m to 3 m. Fully coated rod electrode for sensing aggressive electrically conductive liquids (water, solutions of chemicals), vertical mounting. Electrode length from 0.1 m to 2 m. Uncoated stainless steel rope electrode and weight for general purpose in deeper silos (bulk-solid and powder materials sensing - sand, gravel, cement) or hoppers (liquids sensing), vertical mounting. Electrode length from 1 m to 6 m. Accessories Standard – included in the level sensors price Optional – for extra charge • 1 pcs. Seal (asbestos free) • 1 pcs. Screwdriver for adjustment (each 5 pcs.) • Extra cables (over the standard length 2 m) • Connector plug (type ELWIKA or ELKA) • Normal steel welding flange ON–27 x 2 • Stainless steel welding flange NN–27 x 2 • Stainless steel fixing nut UM–27 x 2 • Other seals (PTFE, Al, etc.) Safety, protections, compatibility and explosion proof Level sensor DLS–27 is equipped with protection against electric shock on electrode, reverse polarity, output current overload, short circuit and short time over voltages. Electromagnetic compatibility is provided by conformity with standards EN 55022 / B, EN 61326-1, EN 61000-4-2, -3 ,-4, -5 and -6. Explosion proof DLS–27Xi, XiM and Xd is examined by FTZÚ - AO210 Ostrava - Radvanice, certifi cate No. FTZÚ 02 ATEX 0234X and FTZÚ 10 ATEX 0092X.

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All data and contents of this card are the exclusive property of Riels Instruments Dimensions drawings

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Technical specifications (variants N, NT, Xd) Supply voltage Current supply (state OFF / ON) Switching current (NPN, PNP output) Output time delay Input resistance / Electric strength Coupling capacity / Electric strength Protection class Cable (version with cable outlets) Weight (exclude electrode) Electrical parameters (variants Xi, XiT, XiM) Current supply (state OFF / ON) - NAMUR    < 1 mA / > 2.2 mA Max. internal values    Ui = 12 V DC; li = 15 mA; Pi = 45 mW; Ci = 60 nF; Li = 10 pH Coupling capacity / Electric strength    2.7 nF / 500 V AC Process connection Output    Variants Type...

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Mounting recommendation All vertically mounted sensors All vertically mounted sensors In the case of vertical mounting it is recommended to keep the mentioned distances applied to the length of the electrode (the longer one). All data and contents of this card are the exclusive property of Riels Instruments All from side mounted sensors In the case of vertical mounting it is necessary to avoid long fitting tubes, where could the vapours condense or some rests sediment. Right figure - wrong, left figure - appropriate. The similar situation is when the sensing electrode goes through the...

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In the case of mounting in the pipe it is necessary to provide the minimum distance of the inner walls from the electrode at 5 mm. In some cases (sticky fluids, low permittivity liquids) it is better to mount the sensor to pipe bend. In the case of vertical mounting it is possible to use hysteresis setting for simple two state regulation (pump control) . The height of the controlled level is done by sensitivity setting, the gap between the min. and max. is defined by hysteresis. In the case of vertical mounting in outer areas or in the case of high mechanical exertion we recommend to...

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