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SCHMIDT

Flow Sensor

SS 23.400 ATEX 3

Instructions for Use

Содержание 513 970

Страница 1: ...SCHMIDT Flow Sensor SS 23 400 ATEX 3 Instructions for Use ...

Страница 2: ...ion range 5 3 Mounting instructions 6 4 Electrical connection 13 5 Signaling 18 6 Startup 21 7 Information concerning operation 22 8 Service information 23 9 Type examination certificate ATEX 25 10 Technical data 26 11 Declaration of conformity 27 Imprint Copyright 2020 SCHMIDT Technology GmbH All rights reserved Version 514622 02G Subject to modifications ...

Страница 3: ...n these instruc tions for use will forfeit any warranty and exclude any liability The unit is designed exclusively for the use described below see chapter 2 In particular it is not designed for direct or indirect protec tion of personal and machinery SCHMIDT Technology cannot give any warranty as to its suitability for certain purpose and cannot be held liable for accidental or sequen tial damage ...

Страница 4: ...trical 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 When transporting the sensor or carrying out not approved clean ing operations always place the yellow protective cap on the sensor tip All dimensions are given in mm ...

Страница 5: ...e of the meas uring medium The essential characteristics of the product are listed below Measuring task o Measurement of flow velocity o Detection of flow direction bidirectional measurement optional Application examples o Laminar flow monitoring in cleanrooms o Monitoring of room cross flow o Cooling air monitoring o Flow measurement in test benches o Draft monitoring Use in areas subject to expl...

Страница 6: ... mounting bracket aluminium ano dised 503895 Room cross flow Wall Plain surface Attachment with 2 screws M5 x 12 Material Anodised aluminium Wall mounting bracket stainless steel 551740 Room cross flow Wall Plain surface Attachment with 2 screws M5 x 12 Material Stainless steel 1 4404 Table 1 All types of mounting fixtures fasten the sensor by frictional clamping This allows stepless positioning o...

Страница 7: ... joint as well as the wall mounting flange are pressure tight up to an overpressure of 500 mbar provided the instal lation has been carried out properly5 The customer bears the responsibility for securing the sensor against unintended discarding due to overpressure Flow with medium separation To ensure the enclosure type of protection IP54 observe the fol lowing mounting drawing for media separate...

Страница 8: ... should not exceed 5 relatively to the ideal position Otherwise the measurement accuracy may be impaired To tighten the spigot nut turn the fork wrench AF17 a quarter of a turn While doing this hold the sensor to ensure that it remains in po sition To achieve the accuracy specified in the data sheets the sensor has to be positioned in a straight pipe section with undisturbed flow profile An undist...

Страница 9: ...5 x D Reduction expansion 90 bend or T junction 15 x D 5 x D Two 90 bends in one plane 2 dimensional 20 x D 5 x D Two 90 bends with 3 dimensional change in direction 35 x D 5 x D Shut off valve 45 x D 5 x D Table 2 This table lists the minimum values required in each case If the listed straight conduit lengths cannot be achieved measurement accuracy may be impaired or additional actions are requir...

Страница 10: ...0181 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 The threaded bush included in the delivery has a broadened base provided with a plane contact surface and two holes that allow a fast and easy installat...

Страница 11: ...h 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 Mechanical installation See previous subchapter Connection of the equipotential bonding The metallic enclosure of the sensor must have electrical con nection to a ground c...

Страница 12: ...oosened or twisted Connecting the cable Connect the shield meshwork in the non hazardous area to the ground potential on a large surface No equipotential current must flow between the Ex areas and non hazardous areas Labeling The rating plate for labeling according to the standards is fixed at the sensor by means of a wire loop If required the customer can attach this plate at another place provid...

Страница 13: ...onnect brown 3 RXD Do not connect green 4 OC1 Switching output 1 Direction threshold yellow 5 OC2 Switching output 2 Switch threshold gray 6 Analog Velocity signal Pink 7 Ground Operating voltage Mass Blue Shield Electromechanical shielding Shield meshwork Table 3 All signals use as electric reference the potential GND The cable shield is connected to the metallic housings of the plug in con necto...

Страница 14: ... if there is an explosive atmosphere available 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 UB 12 26 4 VDC Only operate sensor within the defined range of operating voltage 12 26 4 VDC Undervoltage may result ...

Страница 15: ...300 Ω Maximum load capacity CL 100 nF Maximum cable length 100 m Wiring Voltage output 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 drop11 in the GND wire of the connecting cable mass offset can significantly affect th...

Страница 16: ...esistor which is connected 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...

Страница 17: ...t It switches the output on and off im pulse length of switch through is approx 1 ms switch off break approx 300 ms until the cause of the faulty switching is eliminated An inrush current due to a high capacitive load can trigger the quick reacting short circuit protection permanent although the static current requirement would be below the maximum current IS max An additional resistance connected...

Страница 18: ...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 unidi rectional or in both directions bidirectional For indication of direction there are different possibilities mostly in combination with switching output OC1 see also next subchapter Switching outputs In an unidirection...

Страница 19: ...ation area of the analog signal output is halved that means that zero flow is located at 50 of the signaling range see Figure 5 3 Figure 5 2 Figure 5 3 Error signaling The voltage interface 0 10 V is set to 0 V 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...

Страница 20: ...tching outputs are configured in factory to a positive polarity that means that the previously conductive transistor locks if the switch ing threshold is exceeded and in connection with the switching load RL switches to a positive voltage level of US Switching polarity is configurable by ordering Configuration OC1 If the analog indication area of the bidirectional version corresponds to the amount...

Страница 21: ...be correctly inserted in the female cable connector Check if the device is ready for operation o The parameterization for this application case must be carried out o All interfaces for example inputs and outputs for control purposes must be connected and ready for operation 5 seconds after switch on the sensor is ready for operation If the sensor has another temperature than the ambient this time ...

Страница 22: ...o function properly again To acceler ate the drying process the measuring gap can be cleaned by applying a short compressed air blast or similar methods Cleaning of the system If it is necessary at any time to clean the system in which the sensor is integrated using another cleaning agent than mentioned above protect the sensor tip against exposure to inappropriate cleaning agents by using the pro...

Страница 23: ...If this procedure is not successful the sensor tip can be cleaned by immersing and washing it in alcohol which dries without leaving residues e g isopropyl alcohol As soon as the alcohol has evaporated the sensor is again ready for op eration 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 chambe...

Страница 24: ...cted values of analog output Measured AOut is too high small has strong noise drift Sensor configuration measuring range indication of direction type of output Check order configuration and measurement settings Medium to be measured does not correspond to calibration medium Standard medium Air at 1013 25 hPa and 20 C Check medium parameters Mounting conditions tilting immersion depth Check install...

Страница 25: ...e a repair is only possible at the manu facturer s facilities In case of defects the sensors must be sent in to the supplier for repair If the sensor is used in systems important for operation we recommend you to keep a replacement sensor in stock Test certificates and material certificates Every new sensor is accompanied by a certificate of compliance according to EN10204 2 1 Material certificate...

Страница 26: ...output Current Voltage Type selectable on order short circuit protected 4 20 mA RL 300 Ω CL 100 nF 0 10 V RL 10 kΩ CL 10 nF Switching outputs 2 pcs 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 Configurat...

Страница 27: ...Instructions for Use SCHMIDT Flow Sensor SS 23 400 ATEX 3 Page 27 11 Declaration of conformity ...

Страница 28: ...se SCHMIDT Flow Sensor SS 23 400 ATEX 3 Page 28 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 ...

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