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Summary of Contents for Schmidt SS 23.400 ATEX 3
- Page 1 ® SCHMIDT Flow Sensor SS 23.400 ATEX 3 Instructions for Use...
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Page 2: Table Of Contents
Type examination certificate ATEX ..........25 Technical data ................26 Declaration of conformity ............... 27 Imprint: Copyright 2020 SCHMIDT Technology GmbH All rights reserved Version: 514622.02G Subject to modifications Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 2... -
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 General information Operate sensor only with original connecting cables from SCHMIDT Technology (see chapter “4 Electrical connection”). Use of any other cable makes the ATEX approval null and void. Only suitable for use in clean gases. The medium to be measured must not contain oils, residue form- ing substances or abrasive particles.
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Page 5: Application Range
® The SCHMIDT Flow sensor SS 23.400 ATEX 3 is designed for use in- side closed rooms and is not suitable for outdoor use. Corresponds to the real velocity under standard conditions mentioned above. Instructions for Use – SCHMIDT ®... -
Page 6: Mounting Instructions
3 Mounting instructions For installation of the SS 23.400 ATEX 3 the following accessories are available (see Table 1): Type / art. no. Drawing Assembly Through bolt - Immersion sensor +0,1 Ø 9,2 joint - Pipe (typ.) - Wall 532160... - Page 7 Deviation between the measurement direction of the sensor head and flow direction. The screw-in thread of the through-bolt joint must be sealed for this purpose, e.g. by means of a copper seal or teflon tape. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 7...
- Page 8 The term “laminar” means here an air flow low in turbulence (not according to its physical definition saying that the Reynolds number is < 2300). Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 8...
- Page 9 Under laminar conditions a quasi-parabolic speed profile emerges over the pipe cross-section, whereas the flow velocity at the pipe walls remains E.g. honeycombs made of plastics or ceramics; profile factor may change there-fore. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 9...
- Page 10 The wall mounting flange (520181) is designed for the installation of the flow sensor SS 23.400 ATEX 3 as an immersion sensor through a (locally even) wall (e.g. wall of a flow box). In general, the flange differs from the through-bolt joint only by the type of fastening on the wall.
- Page 11 (503895) (503895) (Wall opening) Figure 3-3 The application of a SS 23.400 ATEX 3 with bidirectional meas- urement capability allows the detection of backflow and is there- fore able to signalize critical operating conditions. ATEX Installation regulation The sensor must be installed properly in the following order: ...
- Page 12 Mounting it undetachably onto the wall according to EN 60079-0, chapter 29.6. The side with the warning note "Do not disconnect under voltage" must remain visible. ® The types of holders supplied by SCHMIDT are not suitable for this purpose. Instructions for Use – SCHMIDT ®...
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Page 13: Electrical Connection
(depending on the shielding concept). ® The wire color mentioned in Table 3 is applicable for the use of SCHMIDT cables with material Nos. 535279 and 565072. - Page 14 Compliance with the applicable regulations and the entire rel- evant documentation for this device. Operating voltage The SS 23.400 ATEX 3 is protected against polarity reversal of the oper- ating voltage. It has a nominal voltage range of U = 12 ... 26.4 V Only operate sensor within the defined range of operating voltage (12 ...
- Page 15 The specific resistance of the lead of the nominal cable (0.14 mm at L = 10 m a current of I = 150 mA can cause a voltage drop of up to 240 mV. B,max Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 15...
- Page 16 + 0.2 �� ���� �� Measuring resistor and switching transistor; additional leakage current of the TVS diode ≈ U connected in parallel (U ): < 100µA S,max Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 16...
- Page 17 30 V at the connecting pin, negative impulses are short-circuited against GND (conducting-state voltage of a diode). The basic current of the switching transistor is negligible. Transient Voltage Suppressor Diode Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 17...
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Page 18: Signaling
0 m/s. Related to the nominal measuring direction (defined as positive) of the sensor tip. OC1 can be configured optionally to any threshold value within measuring range. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 18... - Page 19 By default the response time of flow measurement is 1 s. Optionally it could be configured in the range of 0.01 … 10 s by order. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 19...
- Page 20 Error messaging: Both switching outputs are conducting independently of the configured switching polarity. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 20...
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Page 21: Startup
In case of faults or other problems during installation, the fault table (Table 5) can help to resolve the problem. If the problems persist, please contact SCHMIDT Technology. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 21... -
Page 22: Information Concerning Operation
7 Information concerning operation Sterilization The SS 23.400 ATEX 3 can be sterilized during operation. Approved disinfectants are alcohol (drying without leaving residues) and hydrogen peroxide. If too much alcohol is applied to the sensor, the "soil- ing detection" can be activated and the analog signal is set to error state (0 V or 2 mA). -
Page 23: Service Information
If the chamber head gap of the sensor tip is completely filled with cleaning agent, accelerate the drying process by blow- ing it out, if necessary. Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 23... - Page 24 Check wiring Digital short-circuit protection Load resistance too small active (Increase R > R L,min Reduce load capacity C Insert resistor in series to C Table 5 Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 24...
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Page 25: Type Examination Certificate Atex
Upon request, we shall prepare, at a charge, a factory calibration certifi- cate, traceable to national standards. 9 Type examination certificate ATEX The type examination certificate can be downloaded from homepage of SCHMIDT Technology: www.schmidt-sensors.com Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 25... -
Page 26: Technical Data
Stainless steel 1.4404 Weight Approx. 60 g (with 300 mm probe length) Under reference conditions Including all signal output currents Only with correctly attached connecting cable Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 26... -
Page 27: Declaration Of Conformity
11 Declaration of conformity Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 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 Instructions for Use – SCHMIDT ® Flow Sensor SS 23.400 ATEX 3 Page 28...
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