S401

S401 Thermal Mass Flow Meter for Compressed Air and Gases (Insertion-Sensor)

Easy-to-use insertion flow meter to accurately measure the flow in compressed air systems.

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)

Talk to an expert

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.

Thermal Mass Flow Technology

The S401 is a thermal mass flow meter, based on its measurement principle it’s not required to compensate the compressed air pressure and temperature. So, there is no need of any additional temperature and pressure measurements to measure the standard flow and the consumption.

Measurement of Different Gases

The S401 is well suited to be used in any other gases such as Nitrogen, CO2 and many other technical gases with the use of the thermal mass principle. Gas types can be easily switched in the sensor settings with pre-defined gas calibrations for various gases to maintain accuracy. The S401 sensor technology offers a high resolution and a high sampling rate, which results in a fast and precise measurement. The flow meter can save two calibration curves, and so the sensor can be used in two different gases without any loss of accuracy.

Optional Color Display

The optional color display is designed to show all measured values such as actual flow and total consumption. The display can be used to manage the sensor settings like pipe diameters, gas types and output settings.

Various Signal Outputs

The S401 Flow Meter offers different signal output options. It can be equipped with an isolated analog and pulse output to read out the compressed air flow and the total compressed air consumption.

Alternatively, a Modbus/RTU or Modbus/TCP interface can be used to access all measured values via the digital interface. The S401 can also be equipped with a 2-wire M-Bus output for digital meter reading.

This allows the sensor to be easily connected to SUTO displays, like the SUTO S331 Data Logger and/or third party displays and PLCs. The S401 can also be connected directly to monitoring software solutions.

Easy Installation

With easy installation under pressure through a standard ball valve, it can be simply removed and re-installed for calibrations. This means the shutdown of the compressed air systems as well as the resulting downtime and costs can be avoided. Various settings such as gas type, flow unit and reference standards, can be set ex-factory according to your needs.

Online Readings and Configuration Through Smartphone App

The free S4C-FS mobile phone app helps the user to easily configure the sensor to their needs. The app gives you the option to change settings wirelessly on site. Managing compressed air has never been easier.

Should you have any special requests, for example custom flow ranges or different gas types, please contact us here.

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

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	S401: G1/2" (ISO 228/1) S421: 带R型螺纹或法兰的测量部分
Weight	S401: 0.9 kg S421: 0.4公斤（不含测量部分）"。
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”

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