Schmidt SS 20.500 Instructions For Use Manual
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Schmidt SS 20.500 Instructions For Use Manual

Flow sensor
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®
SCHMIDT
Flow Sensor
SS 20.500
Instructions for Use

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Summary of Contents for Schmidt SS 20.500

  • Page 1 ® SCHMIDT Flow Sensor SS 20.500 Instructions for Use...

  • Page 2: Table Of Contents

    ® SCHMIDT Flow Sensor SS 20.500 Table of Contents Important information............... 3 Application range ................4 Mounting instructions............... 5 Electrical connection..............21 Signalling ..................24 Commissioning ................28 Information concerning operation ..........29 Service information ................ 31 Technical data ................34 Declaration of conformity ...............

  • Page 3: Important Information

     SCHMIDT Technology cannot give any warranty as to its suitability for certain purpose and cannot be held liable for accidental or sequen- tial damage in connection with the delivery, performance or use of this unit.

  • Page 4: Application Range

    Mechanical versions The sensor SS 20.500 is available in a version as compact sensor (probe is fixed at housing) and as a remote sensor (the probe is connected with its sensor housing via a cable).

  • Page 5: Mounting Instructions

    3 Mounting instructions General information on handling The flow sensor SS 20.500 is a precision instrument with high measuring sensitivity, which can be achieved only by means of fine structure of the measuring probe (see Figure 3-1). Therefore, avoid applying mechanical force to the probe tip.
  • Page 6 Systems with overpressure The compact version of the SS 20.500 is designed for a maximum working pressure 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.
  • Page 7 The probe element of the SS 20.500 consists of two basic elements (see Figure 3-2):  The heated measuring element in the probe tip (heater): The barbell-shaped probe tip enables an omnidirectional flow meas- urement vertically to the longitudinal axis of the probe. Furthermore, the flow guiding disks allow deviation from the strictly vertical direction of recording of up to 45°...
  • Page 8 The required abatement distances (in relation to the pipe inner diameter D) for different disturbances are shown in Table 1. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 8...
  • Page 9 Table 2. For example, honeycombs made of plastic or ceramics; profile factor may change. Here interior air friction as well as obstruction caused by sensor is considered. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500...
  • Page 10 2,397 9,587 19,175 33,555 Table 2 SCHMIDT Technology provides a "flow calculator" on its homepage (page: "Service & Support") for calculation of flow velocity or volume flow in pipes for various sensor types: http://www.schmidt-sensors.com/ http://www.schmidttechnology.com/ Instructions for Use – SCHMIDT ®...
  • Page 11 �� �� �� + ℎ Figure 3-4 A uniform flow field prevails in the largest part of the room cross-section. Profile factors are equal for both cross-section shapes. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 11...
  • Page 12 Standard flow velocity in pipe centre [m/s] Average standard flow velocity in tube [m/s] Profile factor V  Standard volumetric flow [m³/s] Typical applications are: Ventilation shaft Exhaust air duct Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 12...
  • Page 13 ® Through-bolt joints from SCHMIDT accessories: SCHMIDT Technology offers four different through-bolt joints that are primarily designed for installation at pipes. They are also suitable for the installation on a wall if high mechanical stability is required or the measuring medium is under overpressure.
  • Page 14 If the protective cap can be removed on the side of the medium; otherwise, remove be- fore installation. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 14...
  • Page 15 (e.g. with tape made of PTFE) and install safety devices to secure against discarding. Further mounting is performed according to the previous subchapter "Di- rect mounting in a wall with a thread". Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 15...
  • Page 16 Mounting with a through-bolt joint SCHMIDT Technology offers four through-bolt joints that differ in material (brass or stainless steel) and pressure tightness (atmospheric or suitable for 10 bar; for details refer to subchapter „Accessories“). MID = 58,5 Figure 3-6 Probe length [mm]...
  • Page 17  Shorten safety chain by removing superfluous chain links so that the chain is slightly tensioned after being locked at the enclosure. Finally, lock chain with a padlock. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 17...
  • Page 18 The sensor probe of the remote version is mounted in the same way as the compact sensor by using optional accessories (through-bolt joint, mounting flange or wall mounting flange). An angle bracket is included for attaching the sensor housing. Figure 3-8 Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 18...
  • Page 19 Accessories ® For installation of the SCHMIDT Flow Sensor SS 20.500, an extensive accessory is available to cover a wide range of applications (see Table 3). Type / article No. Drawing Mounting Connecting cable - Threaded ring, hexagon Standard with...
  • Page 20 Make sure to tighten fastening screw properly, especially for applications with overpressure. Including pressure protection kit. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 20...

  • Page 21: Electrical Connection

    Ground connection of analog outputs gray Table 4 ® The specified lead colours are valid if one of the SCHMIDT connecting cables is used (see subchapter "Accessories"). The appropriate protection class III (SELV) respective PELV (ac- cording EN 50178) has to be considered.
  • Page 22 "Voltage". Including both signal outputs with 22 mA (maximum measuring values), operating volt- age at minimum. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 22...
  • Page 23 AC voltage, the R value is calculated incorrectly which leads to false measurement values or cyclic switching of the signal modes with the frequency of the AC voltage. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 23...

  • Page 24: Signalling

    5 Signalling Light emitting diodes (LED) ® The SCHMIDT Flow Sensor SS 20.500 has four Duo-LEDs (see Fig- ure 5-1) that are either indicating flow velocity during error-free operation in a quantitative way or signal the error cause (see Table 5).
  • Page 25 The measuring range of the corresponding measuring value is mapped in a linear way to the signal range of its associated analog output specific for this mode. In accordance with NAMUR specification. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 25...
  • Page 26 The temperature output normally provides approx. 5 V resp. 12 mA because the typical prevailing room temperature of approx. 20 °C cor- responds to about half of the measuring range. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500...
  • Page 27 Standard signaling of 0 V (possibly 2 mA) could be iden- tified by the control as a very low temperature of the medium, this would lead to further heating. Switching hysteresis for the threshold is approx. 2 K. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 27...

  • Page 28: Commissioning

    6 Commissioning ® Before switching on the SCHMIDT Flow Sensor SS 20.500 the following checks have to be carried out:  Mechanical mounting: Immersion depth of sensor probe and alignment of enclosure. Tightening of fastening screw respective spigot nut. Installation of pressure safety devices.

  • Page 29: Information Concerning Operation

    Even short-term overshooting of operating temperatures can cause irreversible damage to the sensor. Ambient condition pressure The flow sensor SS 20.500 exhibits a minor dependency on overpressure close to zero flow. At w = 0 m/s the sensor signals with increasing overpressure an increasing flow w >...
  • Page 30 Ambient condition medium ® The SCHMIDT Flow Sensor SS 20.500 is especially suitable for impure gases that contain dust, non-abrasive particles or gaseous fractions such as vapors, oils or chemically aggressive components. Deposits or other soiling must be detected during regular inspections and removed by cleaning because it can cause distortion of measurement re- sults (see chapter 8 Service information).

  • Page 31: Service Information

    Causes of any error signalling have to be eliminated imme- diately. Significant exceeding or falling below the permitted operating limits can result in permanent damage to the sensor. Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 31...
  • Page 32 U (DC) resistance to AGND Analog signal switches be- Measuring resistance of Connect measuring tween min. and max. signal output is at GND resistance to AGND Table 9 Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 32...
  • Page 33 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 20.500 Page 33...

  • Page 34: Technical Data

    3 m; special: 1 … 30 m (in steps of 10 cm) Cable: Materials PBT, stainless steel 1.4404, aluminum anodized Coatings (optional): Polyurethane, Parylene Weight 400 g max. (without cable) Under reference conditions Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 34...

  • Page 35: Declaration Of Conformity

    10 Declaration of conformity Instructions for Use – SCHMIDT ® Flow Sensor SS 20.500 Page 35...
  • Page 36 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 20.500 Page 36...

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