Schmidt SS 20.400 Instructions For Use Manual Download Page 1 | Manualshive

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SCHMIDT

®

Flow Sensor

SS 20.400

Instructions for Use

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Summary of Contents for SS 20.400

Page 1: ...SCHMIDT Flow Sensor SS 20 400 Instructions for Use ...

Page 2: ...ange 4 3 Mounting Instructions 5 4 Electrical Connection 10 5 Signalizing 15 6 Startup 18 7 Information on Continuous Operation 18 8 Service Information 19 9 Technical Data 22 10 Declarations of Conformity 23 Imprint Copyright 2021 SCHMIDT Technology GmbH All rights reserved Revision 504301 02G Errors and technical modifications subject to change ...

Page 3: ... instruc tions for use will forfeit any warranty and exclude any liability The unit is designed exclusively for the use described below see chap ter 2 In particular it is not designed for direct or indirect protection of personal and machinery SCHMIDT Technology cannot give any warranty as to its suitability for certain purpose and cannot be held liable for errors contained in these instructions f...

Page 4: ...tions see chapter 5 The decisive characteristics of the product are listed below Measuring task o Measurement of flow velocity o Detection of flow direction bidirectional version Application examples o Laminar flow monitoring in cleanrooms o Monitoring of room cross flow o Cooling air monitoring o Flow measurement in test benches Only suitable for use in clean gases In particular the medium to be ...

Page 5: ...um anodised Wall mounting bracket stainless steel 551740 Room to room overflow Wall plain surface Attachment with 2 screws M5 x 12 Material Stainless steel 1 4404 Table 1 All mounting fixtures fasten the sensor by means of frictional clamping on the sensor tube This enables stepless positioning of the sensor in the holder both axially in direction of the longitudinal sensor axis immersion depth as...

Page 6: ...s of a compression fitting 532160 see Figure 3 1 Screw the threaded part of the compression fitting into the pipe union hexagon AF 27 Unscrew the spigot nut AF17 to such an extent that the sensor can be inserted without jamming Introduce sensor into the compression fitting until its tip is located in the middle of the tube Then tighten the spigot nut slightly using the fork wrench AF17 to fix the ...

Page 7: ... only act in direction of the air flow but also lead to turbulences opposite to flow direction L Length of whole measuring distance L1 Length of run in distance L2 Length of run out distance D Inner diameter of measuring distance Figure 3 2 The following Table 2 shows the required straight conduit lengths depend ing on tube diameter and different disturbances This table lists the minimum values re...

Page 8: ...cross section area the output signal of the flow velocity can be used to calculate the standard volumetric flow of the medium A w V w PF w D A N N N N 2 4 SCHMIDT Technology provides on its homepage a convenient calcula tion tool to compute flow velocity or volume flow in pipes circular or rec tangle for all its sensor types and measuring ranges www schmidt sensors com or www schmidttechnology de ...

Page 9: ... for the compression fitting see subchapter Tube related flow Mounting for measuring room to room overflow A room to room overflow sensor is fixed by means of a wall mounting bracket 503895 made of anodized aluminium or 551740 made of stain less steel The sensor should be placed in flow direction behind the wall opening whereas the sensor tip must be located in the middle of the open ing see Figur...

Page 10: ...The pin assignment of the plug in connector can be found in Table 3 Pin Designation Function Wire colour 1 Power Operating voltage UB White 2 TXD Do not connect8 Brown 3 RXD Do not connect8 Green 4 OC1 Switching output 1 Direction or threshold Yellow 5 OC2 Switching output 2 Threshold Grey 6 Analogue Velocity signal wN Pink 7 GND Operating voltage Mass Blue Shield Electromechanical shielding Shiel...

Page 11: ...II SELV respective PELV EN 50178 has to be considered Operating voltage The SS 20 400 is protected against a polarity reversal of the operating voltage It has a nominal operating voltage range of UB 12 26 4 VDC Only operate sensor in the defined operating voltage range 12 26 4 VDC Undervoltage may result in malfunction Overvoltage may lead to irreversible damage to the sensor The specifications fo...

Page 12: ... 300 Ω Maximum load capacity CL 100 nF Maximum cable length 100 m Wiring Voltage interface Signal range 0 10 V Type High side driver load resistance against GND Minimum load resistance RL 10 kΩ Maximum load capacity CL 10 nF Maximum short circuit current 25 mA Maximum cable length 10 m recommended Wiring The voltage drop in the GND wire of the connecting cable mass offset10 can significantly affec...

Page 13: ...nected in parallel to the transistor the switching stage has a comparatively low off state re sistance of 1 5 M This should be taken into account in case of a high resistance pull up resistor RL For a digital evaluation it is recommended to choose a value of RL 167 k so as to achieve an active high level locked transistor which is 10 below switching voltage US or higher Because of its open collect...

Page 14: ... the switching output switch impulse13 of approx 1 ms duration pause of approx 300 ms with locked transistor until the cause of the faulty switching is eliminated In case of a high capacitive load CL the inrush current impulse may trigger the quick reacting short circuit protection perma nently although the static current requirement is below the maximum current IS max An additional resistor conne...

Page 15: ... a linear way up to 110 of the measuring range end value 10 to signalize clearly that there is an overflow For higher values of flow the output signal remains constant Indication of flow direction15 Depending on its type the sensor measures flow only in one unidirec tional or in both directions bidirectional In an unidirectional version see Figure 5 1 the switching output OC1 factory setting 16 is...

Page 16: ...ation area of the analog signal output is halved that means zero flow is defined at 50 of the signalling range see Figure 5 3 Figure 5 2 Figure 5 3 Error signaling The voltage interface 0 10 V is set to zero The current interface 4 20 mA signalizes 2 mA Response time damping of measured values By default the response time of flow measurement is 1 s Optionally it could be configured in the range of...

Page 17: ...hing outputs are configured by factory with positive polarity which means that a previously conducting transistor locks if the switch ing threshold is exceeded and in connection with the switching load switches to a positive voltage level of US Switching polarity is configurable by ordering Configuration OC1 If the analogue indication area of the bidirectional version corresponds to the absolute v...

Page 18: ...nt is applied to the sensor the soiling detection can be activated and the analog signal is set to error state 0 V or 2 mA As soon as the sensor element is dried the sensor is automatically reset to its normal function Due to its capillarity the chamber head gap in the sensor tip can be filled completely with cleaning agent In this case it is possible that it will take more than one hour until the...

Page 19: ...ure is not successful the sensor tip can be cleaned by im mersing and washing it in alcohol which dries without leaving residues e g isopropyl alcohol As soon as the alcohol has been evaporated the sensor is again ready for operation Do not shake or tap the wet sensor Do not try to clean the sensor tip by any type of mechanical methods Do not touch the sensor element located in the chamber head Th...

Page 20: ...og output Measured AOut Too high low Strong noise drift Sensor configuration Measuring range direction output type Check order configuration and measurement settings Medium to be measured does not correspond to calibration medium Check medium parameters standard medium Air at 1013 25 hPa and 20 C Mounting conditions tilting immersion depth Check mounting conditions Irregular flow conditions turbul...

Page 21: ...e manufacturer Spare parts or repair No spare parts are available since a repair is only possible at the manu facturers In case of defects the sensors must be sent in to the supplier for repair When the sensor is used in systems important for operation we recom mend keeping a replacement sensor in stock Test certificates and material certificates Every newly produced sensor is accompanied by a cer...

Page 22: ... Typ 35 mA max 150 mA 18 Analog output Current Voltage Short circuit protected 4 20 mA RL 300 Ω CL 100 nF 0 10 V RL 10 kΩ CL 10 nF Switching outputs 2 pc open collector current limited short circuit protected Switch 1 OC1 Direction or threshold value Switch 2 OC2 Threshold value Max load 26 4 V DC 55 mA Threshold 0 100 of end value min 0 05 m s Hysteresis 5 of switching threshold min 0 05 m s Conf...

Page 23: ...ole responsibility that the product SCHMIDT Flow Sensor SS 20 400 Part No 518 210 is in compliance with the appropriate European guidelines and standards and UK statutory requirements and designated standards The corresponding declarations of conformity can be download from SCHMIDT homepage www schmidt sensors com www schmidttechnology de ...

Page 24: ...T Flow Sensor SS 20 400 Page 24 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 www schmidttechnology de ...

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