by PAGS Gonçalves · 2011 — Belt scales help maximize the use of raw materials, control in- ventories, and aid in the manufacturing of a consistent product.
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Siemens WT 10 · 20104/2Milltronics Belt Scales 4/2Introduction 4/5Milltronics MLC 4/9Milltronics MBS 4/12Milltronics MUS 4/16Milltronics MCS 4/20Milltronics MSI and MMI 4/28Milltronics WD600 4/31Speed Sensors 4/31Milltronics TASS 4/33Milltronics RBSS 4/36SITRANS WS1004/40SITRANS WS3004/45Milltronics Bend Pulleys 4/48Belt Scales Accessories4/48Milltronics MWL Weight Lifter 4/52Milltronics Flat Bar Calibration Weights 4/53Milltronics Test Chains 4/56Milltronics Test Chain Storage Reels 4/59Milltronics Belt Scale Peripherals Belt Weighing
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Belt Weighing Milltronics Belt ScalesIntroduction 4/2Siemens WT 10 · 20104Overview Belt scales help maximize the use of raw materials, control in- ventories, and aid in the manufacturing of a consistent product. Milltronics belt scales from Siemens are easy to install, and re- quire little maintenance. They produce repeatable, accurate results. These belt scales show minimal hysteresis and superior linearity, and ignore side loading. Load cell overload protection is a feature of the belt scale design. With use of approved intrin- sically safe barrier strips, all belt scales can be used in hazard- ous locations.Typical System A typical belt scale system has a weigh bridge structure sup- ported on load cells, an electronic integrator, and a belt speed sensor. The load cells measure the material weight on the belt, and send a signal to the integrator. The integrator also receives input in the form of electrical pulses from a belt speed sensor connected to a tail or bend pulley. Using these two sources of data, the integrator calculates the rate of material transferred along the belt using the equation weight x speed = rate. Belt scale operationMode of operationSiemens Milltronics belt scales only measure the vertical compo- nent of the applied force. As material moves down the conveyor belt and travels over the belt scale, it exerts a force proportional to the material load through the suspended idler directly to the load cells. The resulting force applied in each load cell is sensed by its strain gauges. When the strain gauges are excited by volt- age from the electronic integrator, they produce an electrical sig- nal proportional to belt loading, which is then applied to the inte- grator. The vertical movement of the load cells is limited by the positive overload stop incorporated into the design of the belt scale or load cells. The stops protect the load cells from failure in the event of extreme overload forces. Installation TipsPosition the scale Locate the scale close to the tail section of the conveyor belt where tension is minimal and more consistent. Mount the scale on rigid mountings, away from equipment that may produce measurement disturbing vibrations. Avoid variable tension points, transition points, or slope change. The ideal location is a horizontal, even belt section, but you can achieve good results on slopes if the idlers are properly aligned. If the conveyor curves, locate the scale a proper distance from the tangent points of the curve. For concave curved conveyors, the recom- mended minimum distance is 12 m (40 ft) from the tangent points of the curve. With convex conveyors, the minimum dis- tance is 6 m (20 ft) on the approach side, and 12 m (40 ft) on the retreat side. Be sure to install the scale a sufficient distance from the infeed section (at least one idler space) so the material has time to settle properly on the belt. Reduce variable belt tension With temperature variations, load, and other circumstances, the belt tension will change. To maintain proper tension, a gravity take-up is recommended. This is a weight designed to take up slack on the belt. A gravity take-up should move freely and place consistent tension on the belt. The use of screw take-ups should be limited to conveyors with pulley centers to 18.3 m (60 ft) or less. The amount of weight should conform to the conveyor de- sign specifications.Align the idlers Precise idler alignment is essential. At least two idlers on each side of the scale should be aligned with the belt scale; use three or more for high accuracy applications. To check alignment, use wire, string, or fishing line across the top outer edges of the roll- ers and tighten enough to eliminate sag. Adjust the height of the rollers with shims until they are all even, or at least within ±0.8mm (1/32”). All of the scale-area idlers should be the same type (size, diameter, style, trough angle, and manufacture) and should be spaced at equal distances. Locate training idlers a minimum of 9 m (30 ft) from the belt scale idler. Install speed sensors The speed sensor should be attached to the tail pulley or bend pulley shaft so the connection does not slip. It is important that the speed sensor be properly mounted as described in the in- struction manual and free of excessive vibration. Whenever pos- sible, mount the speed sensor on a solid face pulley. The use of wing- or beater-type pulleys is not recommended. Wheel driven speed sensors, that are applied to the return strand of the belt, should be located close to a return idler to en- sure a stable drive surface. Wire the scale Follow good instrumentation wiring practices to protect the load cell and speed sensor signals from radio frequency interference and induction. Use terminal blocks, shielded cable, and grounded metal conduit for all wiring. 1592603748MARUN ALT DISPALT DISPPAR RESETTOT AL RESETTOTAL ZERO CLEARCLEARSPAN ENTER weighingidlerbelt scalespeed sensorintegratorloadspeedratetotalloadspeedanalog outputremote total outputbelt travelmaterial load
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Belt Weighing Milltronics Belt ScalesIntroduction 4/3Siemens WT 10 · 20104Technical specifications 1)Accuracy subject to: On factory approved installations the belt scale system’s totalized weight will be within the specified ac curacy when compared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the bel t or at least ten minutes running time, whichever is greater. CriteriaTypical industries Typical applications Maximum capacityMaximum belt speed Loading range Accuracy 1)Approvals Value Specified Range Milltronics MLCAnimal feed, fertilizers, food processing, tobaccoSecondary industries50 t/h (55 STPH) at max. belt speed2.0 m/s (400 fpm)Light± 0.5 1% 25 100% CE, C-TICKMilltronics MBSAggregates, mining, animal feedAggregates, medium-duty1500 t/h (1650 STPH) at max. belt speed3.0 m/s(600 fpm)Moderate±1%33 100% CE, C-TICKMilltronics MUSAggregates, agricultural, mining, cementAggregates, medium- to heavy-duty5000 t/h (5500 STPH) at max. belt speed3.0 m/s (600 fpm)Light to heavy± 0.5 1% 25 100% CE, C-TICKMilltronics MCSAggregates Mobile crushers, aggregates, screening plants, heavy- duty 2400 t/h (2640 STPH) at max. belt speed3.0 m/s (600 fpm)Light to heavy± 0.5 1% 25 100% CE, CSA/FM, ATEX, IECEx, C-TICKMilltronics MSICement, chemicals, coal, food pro- cessing, min- eral processing, miningIndustrial heavy-duty, SABS approval 12000 t/h (13200 STPH) at max. belt speed5.0 m/s (984 fpm)Moderate to heavy± 0.5% or bet- ter20 100% SABS, MID, OIML, Measurement Canada, CE, CSA/FM, ATEX, IECEx, C-TICKMilltronics MMICement, chemicals, coal, food pro- cessing, mineral pro- cessing, miningIndustrial heavy-duty, NTEP, Measurement Canada approval 12000 t/h (13200 STPH) at max. belt speed5.0 m/s (984 fpm)Moderate to heavyMMI-2 (2idler): ± 0.25% or betterMMI-3 (3 idler):± 0.125% or better20 100% 25 100% NTEP, MID, OIML, Measurement Canada, CE, CSA/FM, ATEX, IECEx, C-TICKWD600Food, pharma- ceutical and tobacco indus- triesProcess and load-out control Light- to medium-dutyUp to 50 t/h 2.0 m/s (400 fpm) maximumLight to moder- ate± 0.5 1% 25 100% CE, meets FDA/USDA requirements for food pro- cessors, C-TICK
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Belt Weighing Milltronics Belt ScalesMilltronics MLC 4/5Siemens WT 10 · 20104Overview Milltronics MLC is a low-capacity scale for light belt loading. Benefits•Unique parallelogram style load cell design •Designed for light product loading •Compact and easy to install •System includes weighing idler •Stainless steel option •Low cost of ownership ApplicationThe MLC is suitable for monitoring such products as fertilizer, tobacco, animal feed pellets, or sugar. The MLC’s patented use of parallelogram style load cells results in fast reaction to vertical forces, ensuring instant response to product loading. This enables it to provide outstanding accuracy and repeatability even with very light loading. The MLC may be easily installed in existing flat belt conveyors or belt feeders.Operating with Milltronics BW100, BW500, or SIWAREX FTC microprocessor-based integrators, the MLC provides indication of flow rate, total weight, belt load and belt speed of bulk solids materials on a belt conveyor. A speed sensor monitors conveyor belt speed for input to the integrator. When used in conjunction with Milltronics BW500 integrator with PID controller, the MLC may also be used in the food industry as part of a pre-feed con- trol system for extruders, cookers and de-hydrators. Technical specifications 1) Accuracy subject to: On factory approved installations the belt scale system’s totalized weight will be within the specified accuracy when com- pared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the belt or at least ten minutes running time, whichever is greater. 2)Contact Siemens application engineering for consideration of higher belt speeds.Mode of operationMeasuring principleStrain gauge load cell measuring load on flat belt conveyor idlerTypical application Monitor fertilizer, tobacco, animal feed pellets, sugar, cereal Performance Accuracy1)± 0.5 to 1.0% of totalization over 25 to 100% operating range Medium conditionsMax. material temperature +85 °C (+185 °F)Belt designBelt width•450 to 1200 mm in metric sizes •18 to 48″ in Imperial sizes Belt speed2.0 m/s (400 fpm) maximum2)CapacityUp to 50 t/h (55 STPH)Conveyor incline •± 20° from horizontal, fixed incline •Up to ± 30° with reduced accuracy Idlers Conveyor idlerHorizontalIdler diameter50 or 60 mm or 1.90″Idler spacing0.5 to 1.5 m (1.6 to 5.0 ft)Load cellConstruction17-4 PH (1.4568) stainless steel construction with 304 (1.4301) stainless steel coverDegree of protection IP67Excitation10 V DC nominal, 15 V DC maximumOutput2 mV/V excitation at rated load cell capacityNon-linearity0.03% of rated output Hysteresis 0.05% of rated output Non-repeatability 0.03% of rated output Capacity10 or 20 lbsOverload150% of rated capacity, ultimate 300% of rated capacity Temperature •-40 to +85 °C (-40 to +185 °F) operating range •-10 to +60 °C (+14 to +140 °F) compensated Mounting dimensionsIdentical for all capacitiesHazardous locations Consult the factory Approvals CE, C-TICK, GOST
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Belt Weighing Milltronics Belt ScalesMilltronics MLC 4/6Siemens WT 10 · 20104C) Subject to export regulations AL: N, ECCN: EAR99. Selection and Ordering data Order No. Milltronics MLC Belt Scale Low-capacity scale for light belt loading that comes complete with a weighing idler. C)7MH7126-7777Belt width/Scale constructionPolyester painted mild steel18″ (457 mm) 1A24″ (610 mm)1B30″ (762 mm)1C36″ (914 mm)1D42″ (1067 mm)1E48″ (1219 mm)1F500 mm (20″)1G650 mm (26″)1H800 mm (32″)1J1000 mm (39″)1K1200 mm (47″)1L450 mm (18″)1MStainless steel 304 (1.4301)18″ (457 mm)2A24″ (610 mm)2B30″ (762 mm) 2C36″ (914 mm)2D42″ (1067 mm)2E48″ (1219 mm)2F500 mm (20″)2G650 mm (26″)2H800 mm (32″)2J1000 mm (39″)2K1200 mm (47″)2L450 mm (18″)2MLoad cell capacity10 lb (4.55 kg)A20 lb (9.09 kg)BNot specifiedXWeighing idler dImensions 50 mm (1.96″)1)160 mm (2.40″)2)21.90″ (48.2 mm)3)5Further designs Order Code Please add “-Z” to Order No. and specify Order code(s).Stainless Steel tag [69 x 38 mm (2.7 x 1.5″)], Measuring-point number / identification (max16characters), specify in plain text. Y15Acceptance test certificate: Manufacturer’s test certificate M to DIN 55350, Part 18 and ISO 9000 C11Instruction manual EnglishC)7ML1998-5FF01German C)7ML1998-5FF31Belt Scale Application Guidelines•English C)7ML1998-5GA01•French C)7ML1998-5GA11•German C)7ML1998-5GA31•Spanish C)7ML1998-5GA21Note: The instruction manual should be ordered as a separate item on the order. This device is shipped with the Siemens Milltronics manual CD containing the complete instruction manual library. Spare parts Load cell, 10 lb (4.55 kg), 17-4 PH (1.4568) stain- less steel construction with 304 (1.4301) stainless steel cover, includes hardware 7MH7725-1AALoad cell, 20 lb (9.09 kg), 17-4 PH (1.4568) stain- less steel construction with 304 (1.4301) stainless steel cover, includes hardware 7MH7725-1ABMilltronics MLC calibration weight [Stainless Steel 304 (1.4301)]For scales with belt width of 18″ or 500mm or 450mm 1.05 lbs (0.47 kg)7MH7724-1AL1.63 lbs (0.73 kg)7MH7724-1AM2.35 lbs (1.06 kg)7MH7724-1AN3.21 lbs (1.45 kg)7MH7724-1APFor scales with belt width of 24″ or 650 mm1.38 lbs (0.62 kg)7MH7724-1AQ 2.15 lbs (0.97 kg)7MH7724-1AR3.11 lbs (1.41 kg)7MH7724-1AS4.24 lbs (1.91 kg)7MH7724-1AT For scales with belt width of 30″ or 800 mm1.72 lbs (0.77 kg)7MH7724-1AU 2.67 lbs (1.21 kg)7MH7724-1AV 3.85 lbs (1.73 kg)7MH7724-1AW 5.26 lbs (2.37 kg)7MH7724-1AXFor scales with belt width of 36″ or 1000 mm2.05 lbs (0.92 kg)7MH7724-1AY 3.19 lbs (1.44 kg)7MH7724-1BA 4.56 lbs (2.07 kg)7MH7724-1BB6.29 lbs (2.83 kg)7MH7724-1BCFor scales with belt width of 42″ or 1000 mm2.38 lbs (1.07 kg)7MH7724-1BD3.71 lbs (1.67 kg)7MH7724-1BE5.35 lbs (2.41 kg)7MH7724-1BF7.31 lbs (3.29 kg)7MH7724-1BGFor scales with belt width of 48″ or 1200 mm2.72 lbs (1.22 kg)7MH7724-1BH4.23 lbs (1.92 kg)7MH7724-1BJ6.06 lbs (2.75 kg)7MH7724-1BK8.34 lbs (3.75 kg)7MH7724-1BL1)Available with Belt width/Scale construction options 1G to 1M and 2G to 2M only2)Available with Belt width/Scale construction options 1G to 1M 3)Available with Belt width/Scale construction options 1A to 1F and 2A to 2F onlySelection and Ordering data Order No.
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Belt Weighing Milltronics Belt ScalesMilltronics MBS 4/9Siemens WT 10 · 20104Overview Milltronics MBS is a basic, modular, medium-duty belt scale pro- viding dynamic weighing information for process indication. Idler not included with belt scale.Benefits•Unique modular design •Simple installation •Low cost •Easy retrofit ApplicationMilltronics MBS is used with aggregates, sand, or minerals, animal feeds or grains, providing basic continuous in-line weigh- ing at a minimal cost. With no cross bridge, this versatile unit will fit most conveyor widths and standard idlers, and product build- up is reduced. The construction and easy assembly of the MBS ensure quick delivery to meet even the tightest of schedules. Where scales are moved from conveyor to conveyor, the MBS also provides unmatched flexibility. Operating with Milltronics BW100, BW500, or SIWAREX FTC microprocessor-based integrators, the MBS provides indication of flow rate, total weight, belt load, and speed of bulk solids materials on a belt conveyor. A speed sensor monitors conveyor belt speed for input to the integrator. Technical specifications 1)Accuracy subject to: On factory approved installations the belt scale sys- tem’s totalized weight will be within the specified accuracy when com- pared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the belt or at least ten minutes running time, whichever is greater. 2)Contact Siemens application engineering for consideration of higher belt speeds.3)Review by Siemens application engineer required. Mode of operationMeasuring principleHeavy duty strain gauge load cells measuring load on belt con- veyor idlersTypical applications •Monitor feed rates of fractionat- ed stone, sand, animal feeds, grains •Track daily production totals Performance Accuracy1)±1% of totalization over 33to 100% operating range, applica-tion dependentMedium conditionsMax. material temperature +70 °C (+158 °F)Belt designBelt width•Standard duty up to 1000 mm (CEMA width up to 42″) •Refer to outline dimension section Belt speedUp to 3.0 m/s (600 fpm)2)CapacityUp to 1500 t/h (1650 STPH) at maximum belt speedConveyor incline •± 20° from horizontal, fixed incline •Up to ± 30° with reduced accuracy3)Idlers Idler profile •Flat to 35° •To 45° with reduced accuracy 3) 50 to 150 mm (2 to 6″) Idler diameter50 to 150 mm (2 to 6″)Idler spacing0.6 to 1.5 m (2.0 to 5.0 ft)Load cellConstructionAluminumDegree of protection IP66Excitation10 V DC nominal, 15 V DC max.Output2 ± 0.02 mV/V excitation at rated load cell capacityNon-repeatability 0.01% of rated output Non-linearity0.02% of rated output Hysteresis 0.02% of rated output Capacity30, 50, 100 kg (66, 110, 220 lbs)Overload150% of rated capacity, ultimate 200% of rated capacity Temperature •-30 to +70 °C (-22 to +158 °F) operating range •-10 to +40 °C (+15 to +105 °F) compensated Weight 12 kg (26 lbs), 6 kg (13 lbs) per sideInterconnection wiring (to integrator)•< 150 m (500 ft) 18 AWG (0.75 mm²) 6 conductor shielded cable •> 150 m (500 ft) to 300 m (1000 ft) 18 to 22 AWG (0.75 to 0.34 mm²) 8 conductor shielded cable Hazardous locations Consult the factory Approvals CE, C-TICK
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Belt Weighing Milltronics Belt ScalesMilltronics MBS 4/10Siemens WT 10 · 20104C) Subject to export regulations AL: N, ECCN: EAR99. Selection and Ordering data Order No. Milltronics MBS Belt Scale A basic, modular, medium-duty belt scale providing dynamic weighing information for process indication. C)7MH7121-17770Scale constructionStandard [up to 1000 mm (42″) belt width] 1Load cell capacity30 kg (66 lbs)AB50 kg (110 lbs)AC100 kg (220 lbs)AENot specifiedXXFabrication Polyester painted mild steel1Polyester painted mild steel, for use with flat bar calibration2Further designs Order Code Please add “-Z” to Order No. and specify Order code(s).Stainless Steel tag [69 x 38 mm (2.7 x 1.5″)], Measuring-point number / identification (max16characters), specify in plain text. Y15Acceptance test certificate: Manufacturer’s test certificate M to DIN 55350, Part 18 and ISO 9000 C11Instruction manual Order No. EnglishC)7ML1998-5JN01French C)7ML1998-5JN11German C)7ML1998-5JN31Belt Scale Application Guidelines•English C)7ML1998-5GA01•French C)7ML1998-5GA11•German C)7ML1998-5GA31•Spanish C)7ML1998-5GA21Note: The instruction manual and application guidelines manual should be ordered as separate lines on the order. This device is shipped with the Siemens Milltronics manual CD containing the complete instruction manual library. Spare parts Load cell, 30 kg (66 lbs), aluminum7MH7725-1BKLoad cell, 50 kg (110 lbs), aluminum7MH7725-1BLLoad cell, 100 kg (220 lbs), aluminum7MH7725-1BMCalibration Weights Flat bar/MWL retrofit kit C)7MH7723-1HACalibration test arm assembly, c/w one 8.2 kg (18lb) calibration weight 7MH7723-1FRCalibration test arm assembly, c/w two 8.2 kg (18lb) calibration weights 7MH7723-1FSMBS/MCS calibration arm c/w idler clip (holds up to two 8.2 kg (18 lb) weights7MH7726-1ADCalibration weight, 8.2 kg (18 lb)7MH7724-1AA6.0 lb / 2.7 kg7MH7724-1ABMilltronics flat bar calibration weights, see page4/52 Note: The calibration arm and weights should be ordered as separate lines on the order.
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Belt Weighing Milltronics Belt ScalesMilltronics MBS 4/11Siemens WT 10 · 20104Dimensional drawings MBS dimensionsSchematics MBS connections’B”A’load cells, complete with 3m (10 ft) cablein flexible conduit with M20 panel connectorbelt travelcustomerjunctionboxred‘B’re d‘A’ blk‘B’blk‘A’ wht‘B’grn‘B’wht‘A’ grn‘A’ shield‘B’shield‘A’ +ex c-ex c-sig‘B’+sig‘B’-sig‘A’ +sig‘A’ shieldsee detail ‘A’ Detail ‘A’ conduit and boxconnector
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