Schmidt SS 20.651 Instructions For Use Manual
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Schmidt SS 20.651 Instructions For Use Manual

Flow sensor
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SCHMIDT
Flow Sensor
SS 20.651
Instructions for Use

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Summary of Contents for Schmidt SS 20.651

  • Page 1 ® SCHMIDT Flow Sensor SS 20.651 Instructions for Use...

  • Page 2: Table Of Contents

    ® SCHMIDT Flow Sensor SS 20.651 Table of contents Important information............... 3 Application range ................3 Mounting ..................4 Electrical connection..............10 Commissioning ................18 Service information ................ 19 Dimensions ..................23 Technical table ................24 Declarations of conformity ............. 26...

  • Page 3: Important Information

    2). In particular, it is not designed for direct or indirect protec- tion of personal or machinery.  SCHMIDT Technology cannot give any warranty as to its suitability for a certain purpose and cannot be held liable for errors contained in these instructions for use or for accidental or sequential damage in connection with the delivery, performance or use of this device.

  • Page 4: Mounting

    Shut-off valve 45 x D 5 x D Table 1 Minimum run-in and run-out distances depending on flow obstacles Minimum inner pipe diameter: 25 mm Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 4...
  • Page 5 Mounting method The sensor SS 20.651 is mounted by means of a compression fitting (con- tent of delivery) which clamps the sensor probe by friction. Due to the dif- ferent operating conditions (temperature and pressure range), there are different types (see Table 2): Max.
  • Page 6 Do not use the alignment surface of the housing for mechanical adjustment, e.g. for locking. There is a risk of damage to the sensor. Deviations > 1 % of the measured value Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 6...
  • Page 7 The term “laminar” means here an air flow low in turbulence (not according to its physical definition saying that the Reynolds number is < 2300). Both inner air friction and sensor locking are responsible. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651...
  • Page 8 Profile factor (for pipes with a circular cross-section) V  Standard volume flow [m SCHMIDT Technology provides a "flow calculator" on its homepage for the calculation of flow velocity or volume flow in (circular) pipes or (rectan- gular) shafts for the different sensor types: www.schmidt-sensors.com...
  • Page 9 Pipe profile factor V  Standard volume flow [m Typical applications are: o Ventilation shaft o Exhaust air duct The profile factors are equal for both cross-section forms. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 9...

  • Page 10: Electrical Connection

    PE (depending on the shielding concept). The appropriate protection class III (SELV) respective PELV (EN 50178) has to be considered. Votage-dependant resistor (VDR); breakthrough voltage 27 V @ 1 mA Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 10...
  • Page 11 Operating voltage The flow sensor SS 20.651 is protected against reverse polarity of the operating voltage. For its intended operation, it requires a DC voltage of 24 V with a tolerance of ±20 %. Deviating values can lead to measurement errors or even defects and, therefore, should be avoided.
  • Page 12 R in such a way that a secure detection can be main- tained (≤ 300  for current mode / ≥ 10 k for voltage mode). Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 12...
  • Page 13 ∙ (�� − 4 ����) �� ������,�� �� ������,�� 10 �� �� 16 ���� �� Table 6 Analogue signals for flow measurement In accordance with the Namur specification Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 13...
  • Page 14 (0 V or 2 mA). The signal output for switches, contrary to standard error signalling, directly to the maximum values of 11 V resp. 22 mA. The switching hysteresis for decision threshold is approx. 5 K. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 14...
  • Page 15 The maximum load capacitance C is 10 nF. A higher capacitance re- duces the limit of the current limiter. Overcurrent peaks are absorbed by the short circuit limiter. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 15...
  • Page 16 Protective measures for incorrect wiring or overload are not taken for this output. Transient Voltage Suppressor Diode, breakdown voltage approx. 30 V, peak pulse ca- pacity 4 kW (8 / 20 µs) Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 16...
  • Page 17 If an error occurs, 0 Hz respective no pulses will be output. The current initial state remains unchanged. Note: The relay can be used as a S0-Interface according DIN EN 62053-31 Duty cycle is 1 : ! Formerly: DIN 43864 Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 17...

  • Page 18: Commissioning

    LED off LED shines orange LED shines green LED flashes red (approx. 2 Hz) Table 8 LED signals of sensory functions „%“ of measuring range of flow velocity Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 18...

  • Page 19: Service Information

    Move the cotton pad with great care back and forth parallel to the surface of the chip to rub off the contamination. Use several cotton pads if re- quired. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 19...
  • Page 20 Before recommissioning, the sensor head must be completely dry. The drying process can be accelerated by gently blowing it off. If this procedure does not help, the sensor must be sent to SCHMIDT Technology for cleaning or repair. Eliminating malfunctions The following Table 9 lists possible errors (error images).
  • Page 21 Connect load to AGND permanently at maximum output connected to +U Analogue signal voltage Error signalling Eliminate errors permanently at zero Short circuit against (A)GND Eliminate short circuit Table 9 Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 21...
  • Page 22 Every new sensor is accompanied by a certificate of compliance according to EN 10204-2.1. Material certificates are not available. Upon request, we shall prepare, at a charge, a factory calibration certifi- cate, traceable to national standards. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 22...

  • Page 23: Dimensions

    7 Dimensions Compact sensor Figure 10 Remote sensor (including wall mounting bracket) Figure 11 Dimensions in mm Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 23...

  • Page 24: Technical Table

    Probe length L 250 / 400 / 600 / 1000 mm (both versions) Selectable: 1 … 10 m (in steps of 1 m) Cable (remote connection) * Under reference conditions Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 24...
  • Page 25 Standard connection Housing connector Plug-in connector M12, 8-pin, male, screwed Maximum cable length Voltage signal: 15 m Current / impulse signal: 100 m Table 10 Error signal: 2 mA Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 25...

  • Page 26: Declarations Of Conformity

    9 Declarations of conformity SCHMIDT Technology GmbH herewith declares in its sole responsibility, that the product  SCHMIDT Flow Sensor SS 20.651 Part-No. 546 650 is in compliance with the appropriate European guidelines and standards UK statutory requirements and designated standards.
  • Page 27 Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 27...
  • Page 28 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 www.schmidttechnology.de Instructions for Use – SCHMIDT ® Flow Sensor SS 20.651 Page 28...

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