© Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Overview ■ Application SITRANS WFS300 and WFS320 sensing heads are used in applications such as product rationing, batch load-out, and process feed rate control, the WFS series of sensing heads has been field-proven in thousands of applications with some units providing over a quarter century of reliable performance. The WFS sensing heads use only the horizontal force created by impact of product upon the sensing plate and then apply the horizontal deflection to a highly reliable linear variable differential transformer (LVDT). Friction-less pivots exclude the vertical force from the sensing process and the LVDT travel range is controlled by a coil spring selected for the specified full-scale flow rate. A viscous fluid damper provides mechanical damping in the event of pulsating flows. SITRANS WFS300 and WFS320 sensing heads are out-of-the process sensing elements for SITRANS WF300 series solids flowmeters. ■ Benefits 6 • • • • Easy installation with modular assembly ± 1 % accuracy (or better) with high repeatability Totally enclosed, dust-tight, flow metering of bulk solids Sensing mechanism is outside the process, protected from contamination • No zero drift, due to unique sensing mechanism • Low maintenance; only the sensing plate is in the process • No restriction of product flow 6/28 Siemens WT 10 · Update 04/2015 The LVDT converts the horizontal movement, proportional to the impact forces into an electrical signal, which is converted by the integrator to time-based flow rate indication and totaling. This method of sensing material flow has been proven best in thousands of applications all over the world. © Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Technical specifications 1) WFS300 WFS320 Mode of operation Measuring principle Deflection measurement using LVDT (linear variable differential transformer) Typical application For use in all WF300 series flowmeters Flow input Maximum particle size 13 mm (0.5 inch) 25 mm (1 inch) Minimum flow rate 0 … 0.2 t/h (0 … 0.2 STPH) 0 … 20 t/h (0 … 22 STPH) Maximum flow rate 0 … 40 t/h (0 … 44 STPH) 0 … 300 t/h (0 … 330 STPH) Performance Accuracy1) ± 1 % or better of full scale, higher accuracy with linearizing features offered by integrators Repeatability ± 0.2 % Specified range 33 … 100 % Medium conditions Ambient temperature • Without internally mounted LVDT card -40 … +60 °C (-40 … +140 °F) -40 … +60 °C (-40 … +140 °F) • With optional internally mounted LVDT card -40 … +50 °C (-40 … +122 °F) -40 … +50 °C (-40 … +122 °F) Maximum product temperature 232 °C (450 °F) 232 °C (450 °F) Design IP64 aluminum body, fiberglass cover, 304 (1.4306) stainless steel sensing plate Options • Epoxy paint coating of external aluminum casting surfaces • Internally mounted LVDT conditioner card for use with SF500 integrator • Externally mounted LVDT conditioner card in NEMA 4 (IP65) enclosure for use with Milltronics SF500 or SIWAREX FTC integrator when sensing head is mounted in hazardous areas or with high ambient temperatures Approvals CE, RCM, CSA, FM, GOST, ATEX, IEC Ex 1) 6 CE, RCM, CSA, FM, GOST, ATEX, IEC Ex Accuracy subject to: On factory approved installations the flowmeter system’s totalized weight will be within the specified accuracy 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 at least ten minutes running time. Siemens WT 10 · Update 04/2015 6/29 © Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Selection and ordering data 1) 2) Article No. SITRANS WFS300 sensing head 7MH7110- Further designs Out-of-the-process sensing element for 40 t/h (44 STPH) solids flowmeters. A flowguide, sensing plate and integrator are required to complete the system. Order flowguide, sensing plate and integrator separately. 77777 Please add "-Z" to article no. and specify order code(s). Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Mounting 6 Order Code Stainless steel tag [69 x 38 mm (2.7 x 1.5 inch)], Measuring-point number/identification (max. 27 characters), specify in plain text. Y15 Application Eng. reference number (max.15 characters), specify in plain text. Y31 Manufacturer's test certificate: According to EN 10204-2.2 C11 Base 0 Side 1 Instruction manuals Article No. Base, explosion proof, CSA/FM Class I, Div.1, Groups C and D; Class II, Div. 1, Groups E, F and G, ATEX II 2D - Ex tb IIIC T70 ºC Db IP64, ATEX II 3D, Ex tc IIIB T70 °C Dc IP5X, IECEx FMG 13.0016X, Ex nA IIC T6 Gc, Ex tb IIIC T70 ºC Db IP64 3 • English A5E32880243 • German A5E35327994 • Solids flowmeter Application Guidelines, English 7ML1998-5GK01 7ML1998-5GK31 Side, explosion proof, CSA/FM Class I, Div. 1 Groups C and D; Class II, Div. 1, Groups E, F, and G, ATEX II 2D - Ex tb IIIC T70 ºC Db IP64, ATEX II 3D, Ex tc IIIB T70 °C Dc IP5X, IECEx FMG 13.0016X, Ex nA IIC T6 Gc, Ex tb IIIC T70 ºC Db IP64 4 • Solids flowmeter Application Guidelines, German Note: The instruction manual should be ordered as a separate item on the order. This device is shipped with the Siemens Milltronics manual DVD containing the complete instruction manual library. Calibration hanger weights Note: Externally mounted LVDT Conditioner in NEMA 4 enclosure required for use with SF500 or SIWAREX FTC and mounting option 3 and 4. See optional equipment. Range (Range spring size/leaf spring thickness/ viscosity of damping fluid) 20 g (0.04 lb) 7MH7724-1AC 50 g (0.1 lb) 7MH7724-1AD 100 g (0.2 lb) 7MH7724-1AE 200 g (0.4 lb) 7MH7724-1AF C2/A2/1 000 A C3/A2/1 000 500 g (1.1 lb) 7MH7724-1AG B C4/A2/1 000 1 000 g (2.2 lb) 7MH7724-1AH C C5/A2/1 000 2 000 g (4.4 lb) 7MH7724-1AJ D C6/A2/1 000 5 000 g (11 lb) 7MH7724-1AK E Note: Calibration accessories should be ordered as a separate item on the order. C7/A2/1 000 F C8/A2/3 000 G C9/A2/3 000 H C10/A2/3 000 J C11/A3/5 000 K C12/A3/5 000 L C13/A3/5 000 M C14/A3/5 000 N C0/A2/500 P C0/A3/500 Q C10/A3/3 000 R Gasketing Silicone A Silicone, light duty B PTFE E Coating (process side only) None, standard aluminum 0 Epoxy - white/aluminum, external castings only 1 Sensing head mounted LVDT conditioner None1) 0 Included, required for use with SF500 or SIWAREX FTC integrator2) 1 1) 2) For use with Compu Series integrators or when externally mounted LVDT conditioner required. Applicable for mounting options 0 and 1 only. 6/30 Siemens WT 10 · Update 04/2015 © Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Selection and ordering data Article No. Spare parts LDVT conditioner in NEMA 4 enclosure (to interface SF500 or SIWAREX FTC and LVDT sensor) 7MH7723-1AJ Silicone inner diaphragm 7MH7723-1DN Silicone outer diaphragm 7MH7723-1DP PTFE inner diaphragm 7MH7723-1AL PTFE outer diaphragm 7MH7723-1AM LVDT transformer and core, standard spare 7MH7723-1DS Encapsulated LVDT replacement kit 7MH7723-1DE Damping fluid, 1 000 CS, 1 lb bottle 7MH7723-1EU Damping fluid, 3 000 CS, 1 lb bottle 7MH7723-1EV Damping fluid, 5 000 CS, 1 lb bottle 7MH7723-1EW Range spring assembly, C2 7MH7723-1EX Range spring assembly, C3 7MH7723-1EY Range spring assembly, C4 7MH7723-1FA Range spring assembly, C5 7MH7723-1FB Range spring assembly, C6 7MH7723-1FC Range spring assembly, C7 7MH7723-1FD Range spring assembly, C8 7MH7723-1FE Range spring assembly, C9 7MH7723-1FF Range spring assembly, C10 7MH7723-1FG Range spring assembly, C11 7MH7723-1FH Range spring assembly, C12 7MH7723-1FJ Range spring assembly, C13 7MH7723-1FK Range spring assembly, C14 7MH7723-1FL Leaf spring, A2, kit 7MH7723-1BN Leaf spring, A3, kit 7MH7723-1BP WFS300 calibration wheel kit 7MH7723-1KB Circuit card, LVDT, conditioner 7MH7723-1ET WFS300 replacement O-ring kit 7MH7723-1DC 6 Siemens WT 10 · Update 04/2015 6/31 © Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Selection and ordering data 1) 2) Article No. SITRANS WFS320 sensing head 7MH7112- Further designs Out-of-the-process sensing element for use with 300 t/h (330 STPH) flowmeters. A flowguide, sensing plate and integrator are required to complete the system. Order flowguide, sensing plate and integrator separately. 77777 Please add "-Z" to article no. and specify order code(s). Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Classification Stainless steel tag [69 x 38 mm (2.7 x 1.5 inch)], Measuring-point number/identification (max. 27 characters), specify in plain text. Y15 Application Eng. reference number (max.15 characters), specify in plain text. Y31 Non-hazardous Manufacturer's test certificate: According to EN 10204-2.2 C11 1 Hazardous, CSA/FM Class I, Div.1, Groups C and D; Class II, Div. 1, Groups E, F and G, ATEX II 2D Ex tb IIIC T70 ºC Db IP64, ATEX II 3D, Ex tc IIIB T70 °C Dc IP5X, IECEx FMG 13.0016X, Ex nA IIC T6 Gc, Ex tb IIIC T70 ºC Db IP64 2 Instruction manual Article No. English A5E32880290 German A5E35327995 Note: Instruction manual should be ordered as a separate item on the order. Note: Externally mounted LVDT conditioner in NEMA 4 enclosure required for use with SF500 or SIWAREX FTC and classification option 2. See calibration hanger weights. This device is shipped with the Siemens Milltronics manual DVD containing the complete instruction manual library. Range (range spring size/viscosity of damping fluid) 6 Order Code Calibration hanger weights D1/1 000 Position 1 A 20 g (0.04 lb) 7MH7724-1AC D1/1 000 Position 2 B 50 g (0.1 lb) 7MH7724-1AD D1/1 000 Position 3 C 100 g (0.2 lb) 7MH7724-1AE D2/1 000 Position 1 D 200 g (0.4 lb) 7MH7724-1AF D2/1 000 Position 2 E 500 g (1.1 lb) 7MH7724-1AG D2/1 000 Position 3 F 1 000 g (2.2 lb) 7MH7724-1AH D3/3 000 Position 1 G 2 000 g (4.4 lb) 7MH7724-1AJ D3/3 000 Position 2 H 5 000 g (11 lb) 7MH7724-1AK D3/3 000 Position 3 J D4/5 000 Position 1 K Note: Calibration accessories should be ordered as a separate item on the order. D4/5 000 Position 2 L D4/5 000 Position 3 M LVDT conditioner in NEMA 4 enclosure to interface SF500 and LVDT sensor) 7MH7723-1AJ D5/5 000 Position 1 N Silicone inner diaphragm 7MH7723-1DQ D5/5 000 Position 2 P Silicone outer diaphragm 7MH7723-1DR D5/5 000 Position 3 Q PTFE inner diaphragm 7MH7723-1BA PTFE outer diaphragm 7MH7723-1BB Spare parts Gasketing Silicone A LVDT transformer and core, standard spare 7MH7723-1DS PTFE Other gasketing available upon request D Encapsulated LVDT replacement kit 7MH7723-1DE Damping fluid, 1 000 CS, 1 lb bottle 7MH7723-1EU Damping fluid, 3 000 CS, 1 lb bottle 7MH7723-1EV Damping fluid, 5 000 CS, 1 lb bottle 7MH7723-1EW Range spring assembly, D1 7MH7723-1FM Sensing head mounted LVDT conditioner Range spring assembly, D2 7MH7723-1FN None1) 0 Range spring assembly, D3 7MH7723-1FP 1 Range spring assembly, D4 7MH7723-1FQ Range spring assembly, D5 7MH7723-1GJ Leaf spring kit, 4 required 7MH7723-1BQ Circuit card, LVDT, conditioner 7MH7723-1ET WFS320 calibration wheel kit 7MH7723-1KA WFS320 replacement o-ring kit 7MH7723-1DD WFS320 Taper Pin, spare 7MH7723-1GD Coating (process side only) None, standard aluminum 0 Epoxy - white/aluminum, external castings only Other coatings available upon request. 1 Included, required for use with SF500 or SIWAREX FTC integrator2) 1) 2) For use with Compu series integrators or when externally mounted LVDT conditioner required. See Note under Classification. Available with classification option 1 only. 6/32 Siemens WT 10 · Update 04/2015 © Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Dimensional drawings WFS300 Sensing Head 8 (0.31) dia., 18 bolts on 360 (14.17) B.C.D Outer gasket Conduit entry 1/2" NPT (internal) See note 1) As required 256 (10.06) 280 (11) 260 (10.25) 385 (15.12) Fiberglass cover Sensing plate 50 (1.97) 90 70 (3.54) (2.76) 290 (11.5) Support plate (by customer) 180 (7.09) 6 30 (1.18) 10 (0.38) dia. (4 levelling rods) WFS320 Sensing Head Outer gasket Conduit entry 1/2" NPT (internal) 8 (0.31) dia., 18 bolts on 460 (18.11) B.C.D See note 1) Fiberglass cover 380 (14.96) 340 (13.34) 490 (19.29) 40 (1.57) 560 (22.05) 318 (12.52) As required 60 (2.36) Sensing plate 300 (11.81) 420 (16.54) 70 (2.76) Support plate (by customer) 500 (19.64) 560 (22.05) 16 (0.63) dia. (4 levelling rods) Notes: 1) Refer to flowmeter drawing for sensing head mounting hole to flowguide centerline dimension. 2) Sensing head support plate should be rigid and independent of flowmeter housing. 3) Ensure outer gasket seals dust tight to flowmeter housing wall. WFS300 series sensing head, dimensions in mm (inch) Siemens WT 10 · Update 04/2015 6/33 © Siemens AG 2015 Solids Flowmeters Sensing heads SITRANS WFS300 series sensing heads ■ Schematics To LVDT Collar Flowmeter terminal To the LVDT conditioner card (internally or externally mounted) and Milltronics SF500/Siwarex FTC integrator Consult Siemens representative for hazardous rated versions. WFS300 series connections 6 6/34 Siemens WT 10 · Update 04/2015