SUTO S421 Manual
English
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 cancelled and the manufacturer is e empt from liability.
The device is designed e clusively for the described application.
SUTO offers no guarantee for the suitability for any other purpose.
SUTO is also not liable for consequential damage resulting from the
delivery, capability or use of this device.
2 S421
Table of contents
1 Safety instructions........................................................................4
2 RF e posure information and statement..........................................7
3 Application..................................................................................8
4 Features......................................................................................8
5Technical Data..............................................................................9
5.1 General.................................................................................9
5.2 Electrical Data......................................................................10
5.3 Output-Signals.....................................................................10
5.4 Accuracy .............................................................................10
5.4 Volumetric flow ranges..........................................................10
6 Dimensional drawing...................................................................11
7 Installation considerations...........................................................14
8 Inlet and Outlet sections..............................................................15
9 Sensor Installation .....................................................................18
9.1 Removal of the flow sensor ...................................................19
9.2 Electrical connection ............................................................20
10 Sensor signal outputs...............................................................22
10.1 Analog output.....................................................................22
10.2 Pulse output.......................................................................22
10.2.1 Pulse Connection Diagram..............................................24
10.3 Modbus output....................................................................25
11 Sensor display (option)..............................................................26
11.1 Starting process..................................................................26
11.2 Configuration using the display.............................................27
12 Service App S4C-FS..................................................................28
13 Calibration...............................................................................29
14 Maintenance.............................................................................29
15 Disposal or waste......................................................................29
16 Warranty.................................................................................30
17 Appendi A Analogue output......................................................31
18 Appendi B Modbus communication e ample................................32
19 Appendi C LRC and CRC calculation...........................................34
S421 3
1 Safety instructions
Please check if this instruction manual accords to 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 manufacturer.
WAR I G!
Compressed air!
Any contact with quickly escaping air or bursting
parts of the compressed air system can lead to
serious injuries or even death!
•Do not e ceed the ma imum permitted pressure range (see
sensors label).
•Only use pressure tight installation material.
•Avoid that persons get hit by escaping air or bursting parts of the
instrument.
•The system must be pressureless during maintenance work.
WAR I G!
Voltage used for supply!
Any contact with energized parts of the product, may
lead to an electrical shock which can lead to serious
injuries or even death!
•Consider all regulations for electrical installations.
•The system must be disconnected from any power supply during
maintenance.
•Any electrical work on system is only allowed by authorized
qualified personal.
4 S421
1 Safety instructions
ATTE TIO !
Permitted operating parameters!
Observe the permitted operating parameters, any
operation exceeding this parameters can lead to
malfunctions and may lead to damage on the
instrument or the system.
•Do not e ceed the permitted operating parameters.
•Make sure the product is operated in its permitted limitations.
•Do not e ceed or undercut the permitted storage and operation
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 e plosive areas.
•Please observe the national regulations before/during installation
and operation.
Remarks
•It is not allowed to disassemble the product.
•Always use spanner to mount the product properly.
ATTE TIO !
Measurement values can be affected by malfunction!
The product must be installed properly and
frequently maintained, otherwise it may lead to
wrong measurement values, which can lead to
wrong results.
•Always observe the direction of the flow when installing the
sensor. The direction is indicated on the housing.
•Do not e ceed the ma imum operation temperature at the sensors
tip.
•Avoid condensation on the sensor element as this will affect
accuracy enormously.
S421 5
Storage and transportation
•Make sure that the transportation temperature of the sensor
without display is between -30 ... +70°C and with 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 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%, no condensation.
6 S421
2 RF e posure information and statement
2 RF exposure information and statement
This equipment complies with FCC RF radiation e posure limits set forth
for an uncontrolled environment. This equipment should be installed
and operated with 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 may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
OTE: The manufacturer is not responsible for any radio or TV
interference caused by unauthorized modifications to this equipment.
Such modifications could void the user’s authority to operate the
equipment.
OTE: This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment
generates uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or
more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
Consult the dealer or an e perienced radio/TV technician for help
This device and its antenna(s) must not be co-located or operating in
conjunction with any other antenna or transmitter.
S421 7
3 Application
The S421 is a flow sensor which is designed to measure the
consumption of compressed air and gases within the permissible
operating parameters. These parameters can be found in the technical
data section.
The S421 can measure the following values:
•Volume flow of the compressed air or gas.
•Total consumption of the compressed air or gas.
The default factory units are: Velocity in m/s, Volumetric flow in m3/h
and Total Consumption in m3. Other units can be set by the optional
display or the service kit.
The S421 flow sensor is not developed to be used in e plosive areas.
For the use in e plosive areas please contact the manufacturer.
The S421 flow sensor is mainly used in compressed air systems in
industrial environment.
4 Features
•Inline type sensor for high accuracy in small tube diameters
•Thermal mass flow measurement, virtually independent of
pressure and temperature changes
•IP65 casing provides robust protection in the industrial
environment.
•Very fast response time
•Particularly suitable for measuring process gases such as Ar, O2,
CO2 etc
•Optional display directly on the sensor, showing velocity, volume
flow and consumption
•Modbus interface (optional)
•Two gas calibration (optional)
8 S421
5 Technical Data
5 Technical Data
5.1 General
FCC ID: 2ASK2-SUTO-001
Parameters Standard unit flow: m3/h
Other units: m3/min, l/min, l/s, cfm, kg/h,
kg/min, kg/s
Consumption units: m3, ft3 , kg
Reference conditions ISO1217 20 °C 1000 mbar (Standard-Unit)
DIN1343 0 °C 1013.25 mbar (Norm-Unit)
Principle of measurement Thermal mass flow
Sensor Glass coated resistive sensor
Measuring medium Air, gas (non corrosive gas)
Operating temperature -30 ... +140°C fluid temperature
-30 ... +70°C casing
-10 ... +50°C display (optional)
Humidity of the meas.
medium
< 90%, no condensation
Operating pressure 0 ... 1.6 MPa (Optional: 4.0 MPa)
Housing material PC + ABS
Material of the probe tube,
sensor head (welded
parts)
Stainless steel 1.4404 (SUS 316L)
Protection class IP65
Dimensions See dimensional drawing on the ne t page
Display (optional) 2.4” colour graphics display with keypad
Tube diameter DN15 ... DN80
Process connection: G1/2” (ISO 228/1)
Weight 0.6 kg (Instrument only, not including the
measuring section)
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5.2 Electrical Data
Power supply 15 ... 30 VDC, 200 mA
5.3 Output-Signals
Analogue output Signal: 4 ... 20 mA, isolated
Scaling: 0 to ma flow
Ma load: 250R
Pulse output 1 pulse per consumption unit, isolated
switch, ma . 30 VDC, 200 mA
(pulse length: 10 ... 120 ms, depends on
flow rate)
Modbus output See chapter 10.3
5.4 Accuracy
Accuracy* ± (1.5% of reading + 0.3% FS) (optional
1% of reading)
Temperature drift: < 0.05%/K
Stated accuracy at Ambient/process temperature 23°C ± 3°C
Ambient/process humidity <90%
Process pressure at 0.6 MPa
Repeatability ± 0.25% of reading
*Specified accuracy is valid only within the minimum and ma mim flow
rates that are indicated in section 4.5.
5.4 Volumetric flow ranges
Inch DN S421 (m³/h)
½" DN15 0.5 ... 90
¾" DN20 0.9 ... 170
1" DN25 1.5 ... 290
1¼" DN32 2 ... 500
1½" DN40 3 ... 700
2" DN50 4 ... 1000
2½" DN65 6 ... 1500
3" DN80 8 ... 2500
10 S421
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