Schmidt SS 20.261 Instructions For Use Manual Download Page 20

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Instructions for Use SS 20.261

Page 20

SCHMIDT Technology GmbH

Feldbergstrasse 1
78112 St. Georgen / Germany
Phone +49 (0)7724 / 899-0
Fax +49 (0)7724 / 899-101
[email protected]
www.schmidttechnology.de

Summary of Contents for SS 20.261

Page 1: ...SCHMIDT Flow Sensor SS 20 261 Instructions for Use ...

Page 2: ...on range 4 3 Mounting instructions 5 4 Electrical connection 12 5 Signalizations 13 6 Startup 15 7 Information concerning operation 15 8 Service information 17 9 Technical data 18 10 EC Declaration of conformity 19 Imprint Copyright 2012 SCHMIDT Technology GmbH All rights reserved Version 527254 02B Subject to modifications ...

Page 3: ...ions described in these instructions 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 personal protection SCHMIDT Technology cannot give any warranty as to its suitability for a certain purpose and cannot be held liable for accidental or sequential damage in...

Page 4: ...of the thermal anemometer and measures the mass flow of the measuring medium as flow velocity which is output in a linear way as standard velocity 1 wN unit m s based on standard conditions of 1013 25 hPa and 20 C Thus the resulting output signal is independent from the pressure and temperature of the medium to be measured The SS 20 261 is designed for the use inside closed rooms and is not suitab...

Page 5: ...protective cap should be placed onto the sensor tip Systems with overpressure The SS 20 261 is designed for a maximum working overpressure of 10 bar As long as the medium to be measured is operated with overpressure make sure that There is no overpressure in the system during mounting Mounting and dismounting of the sensor in pipes can be carried out only as long as the system is in depressurized ...

Page 6: ...3 is allowed 3 The sensor measures unidirectional and must be adjusted correctly relative to the flow direction A sensor mounted in opposite direction of the flow direction leads to wrong measuring values too high The lower measuring range limit is according to the system requirements 0 2 m s The center of the chamber head is the actual measuring point of the flow measurement and must be placed in...

Page 7: ...ely straight and without disturbances such as edges seams bends etc It is also necessary to pay attention to the design of the run out distance because disturbances also generate turbulences against the flow direction L2 L D L1 L Length of entire measuring distance L1 Length of run in distance L2 Length of run out distance D Inner diameter of measuring distance Figure 2 The following Table 1 shows...

Page 8: ...n to non SI measuring units for example m 3 h see Table 2 SCHMIDT Technology provides a convenient calculation tool to compute flow velocity or volume flow in pipes for all its sensor types and measuring ranges This Flow Calculator can be directly used on or downloaded from SCHMIDT homepage http www schmidttechnology de de sensorik download FlowCalculator zip Measuring unit of diameter D EF m cm m...

Page 9: ...20 1 380 100 100 4 100 8 0 804 4 62 924 1 386 2 079 110 107 1 0 806 5 23 1 046 1 568 2 353 125 125 5 125 0 0 812 7 17 1 435 2 152 3 229 130 125 131 7 0 814 7 98 1 597 2 395 3 593 150 150 6 150 0 0 817 10 40 2 079 3 119 4 678 160 159 3 0 820 11 77 2 353 3 53 5 295 170 182 5 0 825 15 54 3 108 4 661 6 992 190 190 0 0 826 16 86 3 372 5 059 7 588 200 200 206 5 0 829 19 99 3 998 5 997 8 996 250 260 4 0 ...

Page 10: ...diameter of pipe mm MID Minimum immersion depth mm E Setting length of probe mm Before mounting depressurize system with overpressure media Bore a mounting opening in a pipe wall Weld 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 Slacken compression fitting nut SW17 to such an extent that sensor probe...

Page 11: ... fitting nut slightly by hand so that sensor is fixed Turn sensor manually at its enclosure into required direction and precise position while maintaining immersion depth 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 posit...

Page 12: ...ge UB White WH GND Operating voltage Mass Yellow YE Analog wN Output signal Speed Green GR Analog TM Output signal Temperature of the medium Table 5 Operating voltage For proper operation the sensor requires DC voltage with a nominal value of 24 V with permitted tolerance of 10 and the sensor is protected against a polarity reversal Deviating values lead to deactivation of the measuring function o...

Page 13: ...c resistance RL of max 300 must be connected between the signal output and GND see Figure 5 Load capacity CL is limited to a maximum of 10 nF 5 Signalization Light emitting diodes The sensor is equipped with 2 light emitting diodes LED indicating its functional state Operating state LED 1 LED 2 Supply voltage too low Ready for operation Supply voltage too high Medium temperature beyond specificati...

Page 14: ...0 60 100 IOut mA 20 4 22 12 8 16 IOut m A 0 90 40 T M C 20 4 8 20 22 40 85 60 20 12 12 16 2 4 16 max mA I mA w w wN Out N N C mA I mA C T wN Out M 20 4 16 105 Figure 6 Representation specification for measuring functions The measuring range of the medium temperature is 20 to 85 C Falling below this temperature causes the emission of an error message of this signal output 2 mA An exceeded temperatu...

Page 15: ...n If the sensor has another temperature than the ambient this time is prolonged until the sensor has reached its ambient temperature If the sensor has been stored at very cold conditions before commissioning you have to wait until the sensor and its housing have reached ambient temperature 7 Information concerning operation The sensor is optimized for an operating overpressure of 8 barop If it is ...

Page 16: ... 2 mA Operating voltage too high Medium temperature beyond specification range Check the operating voltage and reduce it Check the medium temperature and set it correctly IwN 2 mA ITM 2 22 mA Flow signal wN is too large small Measuring range too small large Medium to be measured does not correspond to air Sensor element soiled Sensor installed in opposite direction to flow direction Check sensor c...

Page 17: ...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 manufacturer s facilities In case of...

Page 18: ...ng temperature Medium Electronics 20 85 C 0 70 C Humidity range 0 95 rel humidity RH non condensing Operating overpressure 10 bar Operating voltage UB 24 VDC 10 reverse voltage protected Current consumption 60 mA Analog outputs Type RL CL 2 short circuit protected 4 20 mA 300 10 nF Electrical connection Cable fixed on housing 4 pin length 2 m pigtail Line length 100 m max Protection class III PELV...

Page 19: ...Instructions for Use SS 20 261 Page 19 10 EC Declaration of conformity ...

Page 20: ...Instructions for Use SS 20 261 Page 20 SCHMIDT Technology GmbH Feldbergstrasse 1 78112 St Georgen Germany Phone 49 0 7724 899 0 Fax 49 0 7724 899 101 info schmidttechnology de www schmidttechnology de ...

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