SCHMIDT
®
Flow Sensor
SS 20.260
Instructions for Use
Page 1: ...SCHMIDT Flow Sensor SS 20 260 Instructions for Use ...
Page 2: ...on range 4 3 Mounting instructions 4 4 Electrical connection 11 5 Signalization 12 6 Startup 14 7 Information concerning operation 15 8 Service information 16 9 Technical data 17 10 EC Declaration of conformity 18 Imprint Copyright 2011 SCHMIDT Technology GmbH All rights reserved Version 508981 02E Subject to modifications ...
Page 3: ...ions described in these in structions for use will forfeit any warranty and exclude any liability The unit is designed exclusively for the use described below see chapter 2 In particular it is not designed for direct or indirect per sonal protection SCHMIDT Technology cannot give any warranty as to its suitability for certain purpose and cannot be held liable for accidental or se quential damage i...
Page 4: ... of the robust construction of the sensor tip soiling of the inner sensor elements can lead to distortion of measurement results see also chapter 8 Service information During procedures that could stimulate soiling like transport mounting or dismounting of the sensor it is recom mended to place the enclosed SCHMIDT Technology protective cap on the sensor tip and remove it only during operation Dur...
Page 5: ...e Local turbulences of the medium can cause distortion of measurement results Therefore appropriate mounting conditions must be guaranteed to ensure that the gas flow is supplied to the sensor in a quiet and low in turbulence state in order to maintain the accuracy specified see chapter 9 Technical data Correct measurements require quiet flow as low turbulence as possible An undisturbed flow profi...
Page 6: ...valve 45 x D 5 x D Table 1 This table lists the minimum values required in each case If the listed straight conduit lengths cannot be achieved measurement accuracy may be impaired 3 Calculation of volume flow If the cross section area of the pipe is known the output signal of the flow speed can be used to calculate the standard volumetric flow of the medium By means of a correction factor PF 4 whi...
Page 7: ... 0 825 15 5 194 1 554 3 885 200 200 8 206 5 0 829 20 0 250 1 999 4 998 250 10 260 4 0 835 32 0 400 3 202 8 004 300 300 12 309 7 0 840 45 6 570 4 556 11 390 350 14 339 6 0 842 54 9 686 5 491 13 728 400 400 16 389 0 845 72 2 903 7 223 18 058 450 450 18 437 0 847 91 5 1 143 9 147 22 867 500 500 20 486 0 850 114 1 419 11 353 28 383 600 600 24 585 0 854 165 2 066 16 527 41 317 700 700 28 684 0 857 227 ...
Page 8: ...l thread M18 x 1 19 mm long for direct mounting on or in the medium separating wall Its advantage is in the simplicity of installation without special accessories however the im mersion depth is defined by the probe length in this case and requires access from both sides for operation Drill a bore in the wall with 13 14 mm diameter Carefully insert measuring probe with an attached protection sleev...
Page 9: ...connecting piece with an internal thread G in the center above the mounting opening on the pipe Recommended length of connecting piece 15 40 mm If necessary wrap thread using a common sealing tape for example made of PTFE Screw threaded part of compression fitting one or two turns by hand into connecting piece then tighten it with a screw wrench SW27 Remove compression fitting nut and extract both...
Page 10: ...th Angular deviation should not be greater than 3 relative to ideal position Hold sensor and tighten compression fitting nut by turning the fork wrench SW17 a quarter of a turn Recommended torque 10 15 Nm Check the set angular position carefully for example by means of a spirit level at the hexagonal part of the sensor enclosure Mounting accessories Type article No Drawing Mounting Clamp5 a 524 91...
Page 11: ...eversal Deviating values lead to deactivation of the measuring function or even to failure As far as it is possible the LED indication as well as both ana log outputs report faulty operational conditions see chapter 5 Signaliza tion Only operate sensor within the defined range of operating volt age 24 V DC 10 Undervoltage may result in malfunction Overvoltage may lead to irreversible damage to the...
Page 12: ...ity CL is limited to a max imum of 10 nF 5 Signalization Light emitting diodes The sensor is equipped with 2 light emitting diodes LED indicating its functional state Figure 5 Operating state LED 1 LED 2 Supply voltage too low Ready for operation Supply voltage too high Medium temperature beyond specification range Sensor defective Table 6 LED off LED flashes approx 2 Hz green LED on green LED fla...
Page 13: ...is still output in a line ar way moreover the signal remains constant Voltage output wN Current interface wN wN Out N N U V w w max 10 4 16 max mA I mA w w wN Out N N Figure 6 Representation for flow velocity The measuring range of the medium temperature is 20 to 120 C Figure 7 Falling below this temperature it is still output in a linear way down to 30 C 3 mA going deeper the signal remains con s...
Page 14: ...nsor probe and alignment of the housing Tightening of the fastening screw of the compression fitting Correct electrical connection in the field switch cabinet or similar Prior to startup the sensor check mounting and electrical connection 5 seconds after switch on the sensor is ready for operation If the sensor has another temperature than the ambient this time is prolonged until the sensor has re...
Page 15: ...rong polarity UB 15 V Sensor defective Sensor cable connected cor rectly Supply voltage connected to the control Supply cable broken Power supply unit large enough IwN ITM 0 mA Sensor element defective Send in sensor for repair IwN ITM 2 mA Operating voltage too high Check the operating voltage and reduce it IwN ITM 2 mA Flow signal wN is too large small Measuring range too small large Medium is n...
Page 16: ...e delivered protective cap must be placed onto the sensor tip Avoid soiling or mechanical stress Recalibration If the customer has made no other provisions we recommend repeating the calibration at a 12 month interval To do so the sensor must be sent in to the manufacturer Spare parts or repair No spare parts are available since a repair is only possible at the manu facturer s facilities In case o...
Page 17: ...ting temperature Medium Electronics 20 120 C 0 70 C Humidity range 0 95 rel humidity RH non condensing Operating pressure atmospheric 700 1300 mbar Operating voltage UB 24 VDC 10 reverse voltage protected Mounting tolerance 3 relative to flow direction Current consumption 60 mA Analog outputs Type voltage U Typ current I Load capacity 1 or 2 short circuit protected 0 10 V RL 10 k 4 20 mA RL 300 CL...
Page 18: ...Instructions for Use SS 20 260 Page 18 10 EC Declaration of conformity ...
Page 19: ...Instructions for Use SS 20 260 Page 19 Notes ...
Page 20: ...nstructions for Use SS 20 260 Page 20 SCHMIDT Technology GmbH Feldbergstrasse 1 78112 St Georgen Germany Phone 49 0 7724 899 0 Fax 49 0 7724 899 101 sensors schmidttechnology de www schmidttechnology de ...
