Instruction and operation manual S421 Thermal mass flow sensor

Dear Customer, Thank you for choosing our product. Please read this manual in full and carefully observe the operating instructions before starting up the device. The manufacturer cannot be held liable for any damage which occurs as a result of non-observance or non-compliance with this manual. Should the device be tampered with in any manner other than a procedure which is described and specified in the manual, the warranty is void and the manufacturer is exempt from liability. The device is designed exclusively for the described application. SUTO offers no guarantee for suitability for any...

1 Safety instructions Please check if this instruction manual matches the product type. Please observe all notes and instructions indicated in this manual. It contains essential information which must be observed before and during installation, operation, and maintenance. Therefore this instruction manual must be read carefully by the technician as well as by the responsible user / qualified personnel. This instruction manual must be available at the operation site of the flow sensor at any time. In case of any obscurities or questions, regarding this manual or the product, please contact the...

ATTENTION! Permitted operating parameters! Observe the permitted operating parameters. Any operation exceeding these parameters can lead to malfunctions and might lead to damage on the instrument or the system. • Do not exceed the permitted operating parameters. Make sure the product is operated in its permitted limitations. Do not exceed or undercut the permitted storage and operating temperature and pressure. The product should be maintained and calibrated frequently, at least annually. General safety instructions • It is not allowed to use the product in explosive areas. Please observe the...

Make sure that the transportation temperature of the sensor without the display is between -30 ... +70°C and with the display between -10 ... +60°C. For storage and transportation, it is recommended to use the packaging which comes with the sensor. Please make sure that the storage temperature of the sensor is between -10 ... +50°C. Avoid direct UV and solar radiation during storage. For the storage, the humidity must be <90% with no condensation. 2 Registered trademarks SUTO® Registered trademark of SUTO iTEC MODBUS® Registered trademark of the Modbus Organization, Hopkinton, USA HART® Registered...

3 RF exposure information and statement 3 RF exposure information and statement This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and your body. This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device might not cause harmful interference, and (2) this device must accept any interference received, including interference that might cause undesired operation. Remark: The manufacturer...

4 Application The S421 is the inline-type flow sensor that is designed to measure the consumption of compressed air and gases within the permissible operating parameters. (See chapter 6 Technical Data on the next page.) The S421 can measure the following values: • Volume flow of the compressed air or gas (default unit: m3/h) Total consumption of the compressed air or gas (default unit: m3) Other units can be configured by using the S4C-FS Android service app or the optional sensor display. The S421 flow sensor is mainly used in compressed air systems in industrial environment, and is not developed...

6 Technical Data 6.1 General FCC ID: 2ASK2-SUTO-001 Standard unit (flow): Other units (flow): Units (Consumption): Reference conditions Thermal mass flow Glass-coated resistive sensor Measuring medium Measuring range Operating temperature Humidity of the measured medium Operating pressure Housing material Material of the shaft sensor head (welded parts) Protection class See dimensional drawing on page 12 Display (optional) 2.4” color graphics display with keypad Tube diameter 0.6 kg (Instrument only, not including the measuring section) 6.2 Electrical Data Power supply

6.3 Output-Signals Analogue output Signal: 4 ... 20 mA, isolated Scaling: 0 to max flow Max load: 250R Pulse output 1 pulse per consumption unit, isolated switch, max. 30 VDC, 200 mA (pulse length: 10 ... 120 ms, depends on flow rate) Modbus output M-bus output ± (1.5% of reading + 0.3% FS) (optional 1% of reading) Temperature drift: < 0.05%/K Ambient/process temperature 23°C ± 3°C Ambient/process humidity <90% Process pressure at 0.6 MPa *Specified accuracy is valid only within the minimum and maximum flow rates that are indicated in section 6.5 on this page. 6.5 Volumetric flow ranges Inch

Measuring ranges are stated under following conditions: • To fast access the tool download page, enter "flowrange" (without spaces) in the search field. To calculate flow ranges based on pipe sizes and reference conditions in your site, download and install the free "Flow range calculator" tool from http://www.suto-itec.com. The total consumption value is saved to the permanent memory every 5 minutes. If within these 5 minutes the device is powered off, it will restore the last consumption value which was saved in the l

H1 from pipe R center to External casing top thread [mm] Pipe nominal size inch(DN)

H1 Flange (EN 1092-1 from PN40) Pipe L L1 H pipe nominal total inlet total center to size length length height ØD ØK n x ØL casing inch(DN) [mm] [mm] [mm] (mm) (mm) (mm) top [mm]

Pipe L L1 H nominal total inlet total size lengt length height inch(DN h [mm] [mm] ) [mm] H1 Flange (ANSI/B16.5 from pipe class 300) center to casing top ØD ØK n x ØL [mm] (mm) (mm) (mm)

8 Determining the installation point 8 Determining the installation point To maintain the accuracy stated in the technical data, the sensor must be installed inline and fitted to tubes with the same diameter. Please make sure that it has unhindered flow characteristics. Unhindered flow characteristics are achieved if the section in front of the sensor (inlet) and behind the sensor (outlet) is sufficiently long, absolutely straight, and free of obstructions such as edges, seams, curves etc.. Please consider that enough space exists at your site for an adequate installation as described in this...