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SUTO S401 Thermal Mass Flow Meter for Compressed Air and Gases

The SUTO S401 Insertion type, Compressed Air Flow Meter offers an easy to use and affordable compressed air and gas monitoring solution. Due to the wide measurement range and high reliability, the flow meter can be used in various applications.

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Made in Germany. brand SUTO, model S401

Fast delivery to Latvia, Estonia and Lithuania. International delivery to Europe, Asia, Africa and other continents available on request
Our warehouse is located in Riga, Latvia.

price by request

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Official distributor in Latvia

Time-tested American, European and Asian brands of control and measurent instruments

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Special price list for organisations

We offer a significant discount for trade organisations and manufacturing companies

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Worldwide shipping on request

We take care of all logistics and customs clearance. Fast delivery to Baltic countries

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After-sales service and support

Warranty service and repair, expert assistance in the operation of the instruments

Description of SUTO S401

Due to thermal mass flow measurement, the flow meter is well suited for use with various gases such as nitrogen or many other technical gases. The S401 sensor technology provides high resolution and a high sampling rate, resulting in fast and accurate measurement. The flow meter is capable of storing two calibration curves, allowing the sensor to be used with two different gases without loss of accuracy.

The optional color display is designed to show all measured values, such as actual flow rate and total consumption. At the same time, the display can be used to adjust sensor settings, such as pipe diameter, gas type, or output parameters.

The S401 flow meter offers two signal output options. It can be equipped with an isolated analog and pulse output for reading compressed air flow rate and total compressed air consumption. Alternatively, a Modbus/RTU interface can be used to access all measured values via a digital interface.

The SUTO S401 insertion type flow meter is an easy-to-use and cost-effective solution for compressed air and gas monitoring. Thanks to its wide measuring range and high reliability, the device is suitable for a variety of industrial applications. Due to the thermal mass flow principle, the device does not require pressure and temperature compensation of the compressed air. This means that no additional pressure and temperature sensors are needed for standard flow and consumption measurement – simplifying installation and reducing system cost.

Because the flow meter can be easily installed through a standard ball valve, it can also be easily removed for calibration without shutting down the compressed air system. Device parameters – gas type, flow units, reference conditions (ISO1217 / DIN1343) – can be preset ex-factory according to your requirements. This provides a sensor ready for operation without additional on-site configuration. If on-site settings need to be changed, you can use the free S4C-FS mobile app. The app allows you to wirelessly change sensor settings on site and view live readings directly from your smartphone. This enables you to adjust settings wirelessly on site with a single touch on your smartphone. For any special requirements, such as non-standard flow ranges or different gas types, please contact us.

The flow meter can be easily connected to SUTO data loggers (e.g., S331), third-party PLCs, and monitoring systems. Digital interfaces enable direct integration into energy management and analysis software.

Application

  • Compressed air / gas consumption and flow measurement in main and distribution lines
  • Compressed air allocation costs within distribution network
  • Monitoring of efficiency and performance of compressed air and gas systems

Features

  • Efficient compressed air and gas system monitoring
  • Independent of pressure and temperature changes
  • Mobile App for remote configuration and live readings
  • Measures standard flow and total consumption
  • Fast response time over a wide measuring range
  • Color displays to show values and for sensor settings
  • Isolated 4… 20 mA & Pulse; Modbus/ RTU; Modbus/ TCP; M-Bus
  • Installation under pressure (DN25 to DN500)

Technical specifications of SUTO S401

MEASUREMENT
Flow
Accuracy 1.5 % of reading ± 0.3 % FS (optional 1 % of reading)
Selectable units m3/h, m3/min, l/min, l/s, cfm, kg/h, kg/min, kg/s
Repeatability 0.25 % of reading
Sensor Thermal mass flow sensor
Sampling rate 10 samples / sec
Turndown ratio 200:1
Response time (t90) 0.1 sec
Consumption
Selectable units m3, ft3, l
Reference conditions
Selectable conditions 20 °C 1000 mbar (ISO1217),
0 °C 1013 mbar (DIN1343)
freely adjustable
SIGNAL INTERFACE & SUPPLY
Analog output
Signal 4 … 20 mA (4-wire), isolated
Scaling 0 … max flow, freely adjustable
Load max. 250 Ohm
Update rate Value updated ever 1 sec
Pulse output
Signal Switch output, normally open, max. 30 VDC, 20 mA
Scaling 1 pulse per consumption unit (selectable)
Fieldbus
Protocol Modbus/RTU, Modbus/TCP
Update rate Value updated ever 1 sec
Supply
Voltage supply 15 … 30 VDC
Current consumption max. 200 mA
GENERAL DATA
Configuration
Wireless S4C-FS App for mobile phones
PC Software USB Service Kit + Software
Others Display with 2 touch buttons
Display
Integrated 2.4” color graphic display with 3 touch buttons
Material
Process connection Stainless steel 1.4404 (SUS 316L)
Housing PC + ABS
Sensor Ceramic, glass coated
Metal parts Stainless steel 1.4404 (SUS 316L)
Miscellaneous
Electrical connection 2 x M12 (5 pole); 1 x M12 (8-pole x-coded) for TCP
Protection class IP65
Approvals CE, RoHS, FCC
Process connection G1/2″ (ISO 228/1)
Weight  0.9 kg
Operating conditions
Medium Air, N2, O2, CO2 and other gases
Medium quality ISO 8573: 4.4.3 or better
Medium temperature -30 … +140 °C
Medium humidity < 90 % rH, no condensation
Operating pressure max. 5.0 MPa (> 1.6 MPa need installation device)
Ambient temperature -30 … +70 °C, -10 … +50 °C (with display)
Ambient humidity < 99 % rH
Storage temperature -30 … +70 °C
Transport temperature -30 … +70 °C
Pipe sizes S401: ½” … 12” (bigger pipes on request) S421: ½” … 3”
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VOLUMETRIC FLOW RANGES
Pipe Specifications S401 S421
Anschlussgewinde DN DI (mm) S401-S (m3/h) S401-M (m3/h) S401-H (m3/h) Measuring range from to
½” DN15 0.5 … 90 m3/h
¾” DN20 0.9 … 170 m3/h
1” DN25 27.3 0.5 … 147.7 0.6 … 294.7 0.6 … 356.9 1.5 … 290 m3/h
1¼” DN32 36.0 0.9 … 266.3 1.2 … 531.5 1.2 … 643.5 2 … 500 m3/h
1½” DN40 41.9 1.2 … 366.7 1.5 … 731.9 1.5 … 886.2 3 … 700 m3/h
2” DN50 53.1 2.0 … 600.1 2.5 … 1197.6 3.0 … 1450.0 4 … 1000 m3/h
2½” DN65 68.9 3.5 … 1026.5 5.0 … 2048.6 5.0 … 2480.4 6 … 1500 m3/h
3” DN80 80.9 5.0 … 1424.4 7.0 … 2842.7 7.0 … 3441.9 8 … 2500 m3/h
4” DN100 100.0 10 … 2183.3 12 … 4357.2 12.0 … 5275.7
5” DN125 125.0 13 … 3419.6 18 … 6824.4 18.0 … 8263.1
6” DN150 150.0 18 … 4930.1 25 … 9838.9 25.0 … 11913.1
8” DN200 200.0 26 … 8785.6 33 … 17533.3 42.0 … 21229.5
10” DN250 250.0 40 … 13743.9 52 … 27428.5 60.0 … 33210.7
12” DN300 300.0 60 … 19814.8 80 … 39544.1 100.0 … 47880.4
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Prices for SUTO S401

Model Description Price
S695 4100 S401 Thermal Mass Flow Meter (Insertion), 220 mm shaft On request
S695 4101 S401 Thermal Mass Flow Meter (Insertion), 300 mm shaft On request
S695 4102 S401 Thermal Mass Flow Meter (Insertion), 400 mm shaft On request
S695 4103 S401 Thermal Mass Flow Meter (Insertion), 160 mm shaft On request
A1003 Option: Flow Medium: No 2nd Gas On request
A1007 Option: Flow medium Air On request
A1008 Option: Flow medium CO2 On request
A1009 Option: Flow medium O2 (cleaning for oil and grease-free) On request
A1010 Option: Flow medium N2 On request
A1011 Option: Flow medium N2O On request
A1012 Option: Flow medium Argon On request
A1013 Option: Flow medium Natural Gas On request
A1014 Option: Flow medium H2 (For real gas calibration. Please consult manufacturer for this option in advance) On request
A1015 Option: Other gas (specify gas or gas mix) On request
A1016 Option: Flow medium He (real gas calibration) On request
A1017 Option: Flow medium Propane C3H8 On request
A1401 S401: Max range On request
A1402 S401: High speed range On request
A1403 S401/S421: Low range (1/3 of standard range) On request
A1404 S401/S421: High accuracy calibration (1%±0.3 % F.S.) On request
A1405 S401: Bi-directional calibration On request
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User Guide and Instruction manual for SUTO S401

You can request the necessary certificates, documentation, instructions and user guide for SUTO S401 using the special form.

You can buy SUTO S401 in Latvia at a price starting from price by request € in «OLIL SIA» by leaving a request on the website, by phone +371 672 70580 or by email . SUTO S401 price are subject to change depending on exchange rates. We deliver instruments by transport companies in Latvia, Estonia and Lithuania. Worldwide shipping to Europe, Asia, Africa, North and South America available on request.

See also: Flow meters