Schmidt 521501 Instructions For Use Manual Download Page 1 | Manualshive

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SCHMIDT

®

Flow Sensor

SS 20.500

Instructions for Use

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Summary of Contents for 521501

Page 1: ...SCHMIDT Flow Sensor SS 20 500 Instructions for Use ...

Page 2: ... Application range 4 3 Mounting instructions 5 4 Electrical connection 21 5 Signalling 24 6 Commissioning 28 7 Information concerning operation 29 8 Service information 31 9 Technical data 34 10 Declaration of conformity 35 Imprint Copyright 2019 SCHMIDT Technology GmbH All rights reserved Version 523375 02F Subject to modifications ...

Page 3: ...void Tampering with the device in any way whatsoever with the exception of the designated use and the operations described in these instruc tions for use will forfeit any warranty and exclude any liability The unit is designed exclusively for the use described below refer to chapter 2 In particular it is not designed for direct or indirect protec tion of personal and machinery SCHMIDT Technology c...

Page 4: ...al measurement recording o High sensitivity lower measuring threshold 0 06 m s o High turn down ratio max measuring range 50 m s o No undercuts o Sterilizability using hydrogen peroxide3 alcohols etc o High soiling tolerance o High chemical media resistance4 These features predetermine that the sensor is used for example in Clean room Flow channel or duct Free space application When using the sens...

Page 5: ...ough bolt joint even slight tilting can lead to damage of the tip Therefore SCHMIDT Technology delivers the sensor with a protective cap5 placed onto the probe tip which should be removed only during final installation in longitudinal direction Moreover vice versa when dismount ing the sensor the protective cap must be attached in place immediately When handling the sensor generally proceed with g...

Page 6: ...lications see subchapter Accessories contain a pressure protection kit designed especially for this purpose In case of other acces sories or alternative mounting solutions the customer must ensure corre sponding safety measures The components of the pressure protection kit bolt chain and bracket have to be checked regularly for integrity Flow characteristics Local turbulences of the medium can cau...

Page 7: ...ing point of the flow measurement and must be placed in the flow as advantageous as possible for example in the centre of the pipe also see Figure 3 5 Position the barbell shaped segment always at the position advantageous for the flow measurement The measuring sleeve for medium temperature recording T sleeve The sleeve must be positioned directly in the flow field see Figure 3 2 to be able to det...

Page 8: ...turbulences against flow di rection Figure 3 3 L Length of whole measuring distance L1 Length of inlet distance L2 Length of outlet distance D Inner diameter of measuring section The absolute length of the corresponding distance is defined by the inner diameter of the pipe because the flow abatement depends directly on the aspect ratio of the measuring distance to diameter Therefore the required a...

Page 9: ...f the measurement results are to be expected or it is necessary to take additional measures for example to use flow rectifiers8 Under laminar conditions a quasi parabolic speed profile is formed over the pipe cross section whereas the flow velocity at the pipe walls remains almost zero in the middle of the pipe it reaches the optimum measuring point its maximum wN This measurement value can be con...

Page 10: ...703 0 840 206 5 219 1 101 253 1 013 2 026 3 545 0 840 260 4 273 0 161 403 1 610 3 221 5 637 0 845 309 7 323 9 229 573 2 292 4 583 8 020 0 845 339 6 355 6 276 689 2 755 5 511 9 644 0 850 388 8 406 4 363 908 3 633 7 266 12 715 0 850 437 0 457 0 459 1 147 4 590 9 179 16 064 0 850 486 0 508 0 568 1 419 5 677 11 353 19 868 0 850 534 0 559 0 685 1 713 6 853 13 706 23 986 0 850 585 0 610 0 822 2 056 8 22...

Page 11: ...n The sensor must be mounted here in such a way that its sensor tip is far enough from the wall and it measures in the area with constant flow field Typical applications are o Flow box o Clean room Quasi parabolic flow profile The system length is large compared to the cross section surface and flow velocity is so high that the ratios correspond to that of a circular pipe This means that the same ...

Page 12: ... ℎ 𝑏 ℎ 2 𝑤 𝑁 𝑃𝐹 𝑤𝑁 𝑉 𝑁 𝑤 𝑁 𝐴𝐻 b Width of square duct m h Height of square duct m DH Inner diameter of equivalent pipe m AH Cross section area of equivalent pipe m2 N w Standard flow velocity in pipe centre m s N w Average standard flow velocity in tube m s PF Profile factor N V Standard volumetric flow m s Typical applications are o Ventilation shaft o Exhaust air duct ...

Page 13: ...oints from SCHMIDT accessories SCHMIDT Technology offers four different through bolt joints that are primarily designed for installation at pipes They are also suitable for the installation on a wall if high mechanical stability is required or the measuring medium is under overpressure For detailed description of the mounting procedure refer to subchapter Mounting with a through bolt joint Direct ...

Page 14: ...lock is in contact with the wall Tighten using the wrench HEX30 on the mounting block by hand Finally remove protective cap10 The wall must be so thick that the enclosure thread does not protrude on side of the medium to avoid turbulences The immersion length is deter mined by sensor length the rotation position of the sensor cannot be cor rected see Figure 3 2 Installation with a lock nut Screw e...

Page 15: ...th mm SL Length of weld in sleeve mm AL Projecting length mm DA Outer diameter of pipe mm MID Minimum immersion depth mm This method is suitable for high pressure applications provided the re quired safety measures are taken For measurements in media with overpressure switch system to depressurized state seal thread e g with tape made of PTFE and install safety devices to secure against discarding...

Page 16: ...e 3 6 L Probe length mm AL Projecting length mm DA Outer diameter of pipe mm MID Minimum immersion depth mm LDG Length of through bolt joint mm The through bolt joints are installed using an external thread G Typi cally a sleeve is welded as a connecting piece onto the bore in the me dium guiding system wall Typical applications use pipes that13 are used for the description of the mounting procedu...

Page 17: ...on chain onto thread Observe correct seat and alignment of chain bracket Unscrew spigot nut of the through bolt joint HEX17 to such an extent that sensor probe can be inserted without jamming Remove protective cap from sensor tip carefully insert probe into the guide in a coaxial direction and insert it so that the barbell shaped head sleeve is placed at measuring position in the middle of the pip...

Page 18: ...rew down mounting flange Remove protective cap and insert sensor probe carefully in a coaxial direction into mounting flange Adjust immersion depth of probe adjust sensor enclosure and fasten sensor by means of locking screw Mounting of the remote version The sensor probe of the remote version is mounted in the same way as the compact sensor by using optional accessories through bolt joint mountin...

Page 19: ... PP Free of halogen14 Coupler socket VA thread locking system 523 562 Threaded ring hexagon Material Stainless steel Polyamide PUR PP Connection of leads Bolted 0 25 mm2 Clamp15 a 524916 b 524882 Internal thread G Material a Steel black b Stainless steel 1 4571 Mounting flange 301048 Immersion sensor Wall Fastening with screws Material Steel galvanic Zn PTFE Atmospheric pressure use Through bolt j...

Page 20: ...r Table 3 Notes The supplied connecting cables generally consist of media resistant materials thread ring made of stainless steel sheathing and enclo sure made of PUR The connecting cable with fixed length is not free of halogen The connecting cable with adjustable length lead insulation made of modified PP as well as the coupler socket is free of halogen All mounting fixtures fasten the sensor by...

Page 21: ...es 713 Pin numbering View on connector of sensor Figure 4 1 Pin assignment of the plug in connector is given in the following Table 4 Pin Designation Function Lead colour 1 Power Operating voltage DC UB Operating voltage AC U brown 2 Analog TM Output signal Temperature of medium white 3 GND Operating voltage DC GND UB Operating voltage AC U blue 4 Analog wN Output signal Standard flow velocity bla...

Page 22: ...ustomer Wiring of analog outputs Both analog outputs for flow and temperature are designed as high side driver with Auto U I feature and have a permanent short circuit protec tion against both rails of the operating voltage Use of only one analog output It is recommended to connect the same resistance value to both ana log outputs even if only one of them is used For example if only the flow analo...

Page 23: ... maximum load capacity is 10 nF Short circuit mode In case of a short circuit against the positive rail of the operating DC voltage UB resp against both rails during the positive AC half cycle the signal output is switched off Due to internal measuring re sistances it is possible that a current of max 15 mA flows into the sensor output referred to AGND In case of a short circuit against the negati...

Page 24: ...D 4 1 Ready for operation flow 5 19 2 Flow 5 3 Flow 20 4 Flow 50 5 Flow 80 6 Flow 100 overflow 7 Sensor element defective 8 Supply voltage too low 9 Supply voltage too high 10 Electronic temperature too low 11 Electronic temperature too high 12 Medium temperature too low 13 Medium temperature too high Table 5 LED off LED shines orange LED shines green LED flashes red approx 1 Hz 18 Component with ...

Page 25: ...e To detect possible alternating load for an actual zero signal the elec tronics generates test pulses that correspond to an effective value of approx 1 mV However latest measuring devices may trigger in re sponse to such a pulse in DC voltage measuring mode and display short term measuring values of up to 20 mV In this case it is re com mended to install an RC filter at the measuring input with a...

Page 26: ...40 and 85 C see Table 7 Voltage mode U Current mode I 𝑤𝑁 125 10 𝑉 𝑈𝑂𝑢𝑡 𝑇𝑀 40 𝐶 𝑤𝑁 125 16 𝑚𝐴 𝐼𝑂𝑢𝑡 𝑇𝑀 4 𝑚𝐴 40 𝐶 Table 7 Standard for representation of medium temperature measurement Note regarding commissioning The temperature output normally provides approx 5 V resp 12 mA because the typical prevailing room temperature of approx 20 C cor responds to about half of the measuring range UOut V 0 110 wN...

Page 27: ...to error signaling 0 V resp 2 mA 21 Measuring function of the flow velocity is switched off its analog output also reports an error 0 V resp 2 mA o Medium temperature above TM max 85 C Up to 90 C TM is still output in a linear way this corresponds to 10 4 V resp 20 6 mA to enable an overshooting of heating con trol The flow velocity is measured and displayed further on Above this critical limit20 ...

Page 28: ...on connecting cable connector at sensor en closure After turning on the operating voltage the sensor reports initialization by switching on all four LEDs simultaneously for one second at a time se quentially in the colors red orange and green If the sensor detects a problem during initialization it reports the problem after initialization according to Table 5 An extensive overview of error causes ...

Page 29: ...ct ing cable Even short term overshooting of operating temperatures can cause irreversible damage to the sensor Ambient condition pressure The flow sensor SS 20 500 exhibits a minor dependency on overpressure pop close to zero flow At wN 0 m s the sensor signals with increasing overpressure an increasing flow wN Sensor 0 Op 0 m s in a proportional way This deviation decreases rapidly with increasi...

Page 30: ...l cohols ammonia petrol motor oil 50 C cutting oil 50 C sodium hy droxide acetic acid hydrochloric acid sulphuric acid and more The suitability of the mentioned above or other similar chemicals must be checked in every individual case due to different ambient conditions Condensing liquid fractions in gases or even immersion into liquids do not damage the probe as long as there is no damage due to ...

Page 31: ...gs can be previously softened by prolonged im mersion and then removed by means of a soft brush Avoid applying force to the sensitive probe tip The sensor tip is a sensitive measuring system During manual cleaning proceed with great care Before putting it into operation again wait until the sensor tip is completely dry Troubleshooting Possible errors error images are listed in the Table 9 There is...

Page 32: ... Decrease temperature of environment Medium temperature too low Increase medium temperature Medium temperature too high Reduce medium temperature Flow signal wN is too large small Measuring range too small large I mode instead of U mode Measuring medium does not correspond to air Sensor head is soiled Check sensor configuration Check measuring resistance Gas correction considered Clean sensor tip ...

Page 33: ...urer s facility In case of defects the sensors must be sent in to the supplier for repair A completed declaration of decontamination must be attached The Declaration of decontamination form is enclosed with the sensor and can also be downloaded from www schmidt sensors com or www schmidttechnology com under Service Support When the sensor is used in systems important for operation we recom mend yo...

Page 34: ...ondensing Max operating pressure Compact version 10 bar Remote version atmospheric 1 300 hPa Operating voltage UB 24 VDC AC 20 Current consumption typ 60 mA max 170 mA Analog outputs Type Auto U I Voltage output Current output Switching hysteresis Maximum load capacity Flow velocity wN medium temperature TM Automatic switching of signal mode based on load RL 0 10 V for RL 550 Ω 4 20 mA for RL 500 ...

Page 35: ...Instructions for Use SCHMIDT Flow Sensor SS 20 500 Page 35 10 Declaration of conformity ...

Page 36: ...r Use SCHMIDT Flow Sensor SS 20 500 Page 36 SCHMIDT Technology GmbH Feldbergstraße 1 78112 St Georgen Germany Phone 49 0 7724 899 0 Fax 49 0 7724 899 101 Email sensors schmidttechnology de URL www schmidt sensors com ...

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