© Siemens AG 2011 Belt Scales Speed Sensors SITRANS WS100 ■ Overview ■ Application SITRANS WS100 speed sensor operates in conjunction with a conveyor belt scale, providing a signal to an integrator (Milltronics BW100 or BW500, or SIWAREX FTC module) which computes the rate of material being conveyed. It is lightweight at 1.22 kg (2.68 lb) and durable, for easy installation and prolonged bearing life. The WS100 converts shaft rotation into a pulse train of 8 pulses per revolution. These pulses are typically fed into a Milltronics belt scale integrator. The integrator interprets the pulses and uses them in the calculation of belt speed, flow rate, and material totalization. In non-belt scale applications, the WS100 can be used to monitor rotational speed when directly connected to a PLC. The WS100 IS (intrinsically safe) version contains an inductive proximity switch which transmits the pulses via a switch isolator for hazardous area locations. ■ Design The input shaft on the SITRANS WS100 is coupled to the rotating shaft on a belt-driven pulley with a tapped hole, and is externally supported. The unit’s flexible arresting strap stops it from rotating with the shaft, without causing bearing stress, and can be fitted to any rigid member close to the sensor. 4 SITRANS WS100 speed sensor is a compact, medium-resolution, pulley shaft-driven belt speed sensor with magnetic mounting. It is ideal for aggregate and mineral processing industries. ■ Benefits • Small, light-weight • Good resolution for accurate measurement, suitable for varying shaft speeds • Long bearing life 4/38 Siemens WT 10 · 2012 When mounting, ensure the unit and the pulley shaft are concentric to avoid stresses on the unit’s bearings. For mounting using the magnetic connector, ensure the face of the rotating shaft on the belt driven pulley is flat, and has no burrs or damage that may prevent flush mounting of the magnetic connector. Attach the SITRANS WS100 speed sensor to the shaft; the magnetic connector will center itself as the belt driven pulley rotates. © Siemens AG 2011 Belt Scales Speed Sensors SITRANS WS100 ■ Design (continued) Mounting to a Tail Pulley Belt SITRANS WS100 Restraining bracket (mounted off bearing) Cable Arrestor strap (mounted to restraining bracket) Mounting to a Bend or Snub Pulley Conveyor stringer Z Z 4 Conveyor structure for arrestor strap Belt SITRANS WS100 Arrestor strap WS100 installation Siemens WT 10 · 2012 4/39 © Siemens AG 2011 Belt Scales Speed Sensors SITRANS WS100 ■ Technical specifications Milltronics WW100 Approvals Mode of operation WS100 CE, C-TICK1) WS100 IS (with suitable IS switch isolator or switch amplifier)2) • ATEX II 1G EEx ia IIC T6 • ATEX II 1D Ex iaD 20 T 108 °C • CSA/FM • CE, C-TICK2) Proximity Switch Approval Ratings (Pepperl+Fuchs #NCN4- 12GM35N0) • ATEX II 1G EEx ia IIC T6 • ATEX II 1D Ex iaD 20 T 108 °C • CSA Class I, Div. 1, Groups A, B, C, and D, Class II, Div. 1, Groups E, F, and G, Class III (system approval) • CE, FM2) Measuring principle Proximity sensor provides pulse to integrator Typical application Aggregate belt conveyors Input Shaft rotation 15 … 1500 rpm, bi-directional Shaft rotation 15 … 300 rpm, bi-directional with magnetic connector • 8 pulses per revolution • 0 … 200 Hz, 0 … 40 Hz with magnetic connection • WS100 standard: open collector sinking output, 25 mA • WS100 IS: load current, 0 … 15 mA • Integrator minimum usable frequency 2 Hz Output Optional Switch Isolator (required for WS100 IS)3) Pepperl+Fuchs #KFA5-SOT2-Ex2 or #KFA6-SOT2-Ex2 Rated operating conditions Standard 4 -40 … +110 °C (-40 … +230 °F) Intrinsically Safe -25 … +100 °C (-14 … +212 °F) Degee of protection IP67 Enclosure Polypropylene base and target enclosure with 304 (1.4301) stainless steel access cover 304 (1.4301) stainless steel shaft, bearings and hardware Power Standard 4.5 … 28 V DC, 16 mA Intrinsically Safe 5 … 25 V DC from IS switch isolator Cable Standard • 3 m (10 ft), 3 conductor 22 AWG (0.324 mm²), PVC shielded cable • 300 m (1000 ft) maximum cable run Intrinsically Safe • 2 m (6.5 ft), 2 conductor 26 AWG (0.129 mm²), PVC covered cable • 300 m (1000 ft) maximum cable run to IS switch isolator • 300 m (1000 ft) maximum cable run from IS switch isolator and integrator 4/40 Siemens WT 10 · 2012 • ATEX II (1) G [EEX ia] IIC • CSA/FM: Class 1, Div. 1, Groups A, B, C, and D. Class II, Div. 1, Groups E, F, and G, Class III • CE2) 1) EMC performance available upon request. 2) Approvals for RBSS IS are based on internally mounted NAMUR slotted proximity switch (Pepperl+Fuchs #NJ0.8-5GM-N) and use of suitable IS Switch Isolator (Amplifier). Please see RBSS Operating Instructions for more information. 3) Approval ratings for the proximity switch and IS switch isolator are the property of Pepperl+Fuchs. Copies of these approval certificates may be obtained at http://www.siemens.com/processautomation. © Siemens AG 2011 Belt Scales Speed Sensors SITRANS WS100 ■ Selection and Ordering data Order No. C) 7MH7176SITRANS WS100 Speed Sensor A compact, medium-resolution, pulley shaft-driven belt speed sensor with magnetic mounting; ideal 77777 for aggregate and mineral processing industries. Model 8 PPR Fabrication Polycarbonate construction with 304 stainless steel sensor cover 1 A Mounting M12X1.75 threaded shaft A Magnetic connector B Approvals Standard CE, C-TICK 0 1 CE, C-TICK, ATEX II 1G, EEx ia IIC T6, ATEX II 1D Ex iaD 20 T 108 °C, and CSA/FM Switch Isolator Not required 0 115 V AC (required with IS option 1) 1 230 V AC (required with IS option 1) 2 Further designs Order Code 4 Please add "-Z" to Order No. and specify Order code(s). Stainless Steel tag [69 x 38 mm (2.7 x 1.5 inch)], Measuring-point number / identification (max 16 characters), specify in plain text. Manufacturer's Test Certificate: According to EN 10204-2.2 Operating Instructions SITRANS WS100, English SITRANS WS100, German Note: The Operating Instructions should be ordered as a separate item on the order. Y15 C11 Order No. C) 7ML1998-5LU02 7ML1998-5LU31 This device is shipped with the Siemens Milltronics manual CD containing the complete Operating Instructions library. Spare Parts Switch, Standard Magnetic Pickup C) 7MH7723-1GA Switch, inductive, NJO.8-5GM-N for Approvals option 1 C) 7MH7723-1AS WS100 Magnetic Connector C) 7MH7723-1GF P & F Switch Isolator, 115 V AC, required for Approvals option 1 7MH7723-1EB P & F Switch Isolator, 230 V AC, required for Approvals option 1 7MH7723-1EC C) Subject to export regulations AL: N, ECCN: EAR99. Siemens WT 10 · 2012 4/41 © Siemens AG 2011 Belt Scales Speed Sensors SITRANS WS100 ■ Dimensional drawings Dimensions M20 (½" NPT) diameter hole for conduit adaptor (use flexible conduit) Ø89 (3.50) 20 36 (0.79) (1.43) Polypropylene sealed housing for ferrous targets Arrestor strap Magnetic shaft connector option Magnetic shaft connector Stainless steel sensor cover Arrestor strap 31 (1.24) 53 (2.10) Cable 4 51 (2.00) Ø44 (1.75) 203 (8.00) 15 (0.60) 22 (0.85) Male shaft connector option WS100 dimensions in mm (inch) 4/42 Siemens WT 10 · 2012 M12 x 1.75 male shaft connector 222 (8.75)