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Summary of Contents for Schmidt SS 20.420
- Page 1 ® SCHMIDT Flow Sensor SS 20.420 Instructions for Use...
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Page 2: Table Of Contents
Startup ................... 13 Information on Operation ............... 14 Service Informations ..............15 Technical Data ................18 Declarations of Conformity ............19 Impressum: Copyright 2021 SCHMIDT Technology GmbH All rights reserved Revision: 538888.02E Subject to modifications Instructions for Use – SCHMIDT ®... -
Page 3: Important Information
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 for use or for accidental or sequential damage in connec- tion with the delivery, performance or use of this unit. -
Page 4: Application Range
2 Application Range ® The SCHMIDT Flow sensor SS 20.420 (article number: 538045) is de- signed for stationary use in cleanrooms, air ducts or air shafts under at- mospheric pressure conditions and clean environmental conditions. The sensor measures the flow velocity of the measuring medium as standard velocity (unit: m/s) relative to standard pressure of 1,013.25 hPa and... -
Page 5: Mounting Instructions
Commercially available welding stud (not included in the delivery) must be welded. Countersunk head (not included in the delivery). Deviation between measuring direction of sensor head and flow direction. Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 5... - Page 6 Then tighten spigot nut slightly using a fork wrench AF17 to fix the sensor. Compression fitting 532160 Figure 3-2 The screw-in thread of the compression fitting must be sealed, e.g. with teflon tape. Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 6...
- Page 7 Tighten spigot nut by turning the fork wrench (AF17) by a quarter while maintaining the sensor in position. To reach the accuracy specified in its data sheet, the SS 20.420 has to be positioned in a straight pipe and at a place with undisturbed flow profile.
- Page 8 Profile factor (for tubes with a circular cross section A) V Standard volumetric flow [m 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...
- Page 9 Figure 3-4 for an example with 503895). (Wall opening) Figure 3-4 The application of a SS 20.420 with bidirectional measurement capability allows the detection of backflow and is therefore able to signalize critical operating conditions. Instructions for Use – SCHMIDT ®...
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Page 10: Electrical Connection
The appropriate protection class III (SELV) respective PELV (EN 50178) has to be considered. Operating voltage The SS 20.420 is protected against a polarity reversal of the operating voltage. It has a nominal operating voltage range of U = 12 ... 26.4 V Only operate sensor in the defined operating voltage range (12 ... - Page 11 The specific resistance of the lead of the connecting cable (0.14 mm (20 °C); at L = 10 m a current of I = 10 mA can cause a voltage drop up to 14 mV. B,max Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 11...
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Page 12: Signalizing
5 Signalizing Analog output The SS 20.420 measures flow speed either in one (unidirectional) or op- tionally in both directions (bidirectional). Representation of measuring range and flow direction: The measuring range (0 … w ) of the unidirectional version is N,max mapped proportionally to the whole signaling range (0 …... -
Page 13: Startup
In case of faults or other problems during installation, the fault table (see Table 5) can help to resolve the problem. If the problems persist, please contact SCHMIDT Technology. Instructions for Use – SCHMIDT ®... -
Page 14: Information On Operation
7 Information on Operation Sterilization The SS 20.420 can be sterilized during operation. Approved disinfectants are alcohol (drying without leaving residues). If too much cleaning agent is applied to the sensor, the "soiling detection" can be activated and the analog signal is set to error state (0 V). As soon as the sensor element is dried, the sensor is automatically reset to its normal function. -
Page 15: Service Informations
If the chamber head gap of the sensor tip is completely filled with cleaning agent, accelerate the drying process by blowing it out, if necessary. Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 15... - Page 16 Load resistance R < R L,min Increase resistance ≥ 10 k Load capacity C > C L,max Reduce capacity ≤ 1 nF Insert resistor in series to C Table 5 Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 16...
- Page 17 Transport / dispatch of the sensor Before transport or dispatch of the SS 20.420, the delivered pro- tective cap must be put over the sensor head. Avoid soiling or mechanical stress. Calibration If the customer has made no other provisions, we recommend repeating the calibration at a 12-month interval.
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Page 18: Technical Data
60 / 110 mm Weight About 40 g Under reference condition Including signal output current Sheath approx. 50 mm stripped, stranded ends approx. 6 mm stripped and tinned Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 18... -
Page 19: Declarations Of Conformity
10 Declarations of Conformity SCHMIDT Technology GmbH herewith declares in its sole responsibility, that the product SCHMIDT Flow Sensor SS 20.420 Part-No. 538 045 is in compliance with the appropriate European guidelines and standards UK statutory requirements and designated standards. - Page 20 SCHMIDT Technology GmbH Feldbergstraße 1 78112 St. Georgen Germany Phone +49 (0)7724 / 899-0 +49 (0)7724 / 899-101 Email sensors@schmidttechnology.de www.schmidt-sensors.com Instructions for Use – SCHMIDT ® Flow sensor SS 20.420 Page 20...
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