S451

S451 Thermal Mass Flow Meter for Heavy Duty and Ex Applications (Insertion)

Precise flow measurement for large pipes in explosive environments, with robust construction and wireless setup.

Flow, consumption, pressure, and temperature measurement

IP67-rated, corrosion-resistant housing

Reliable in harsh conditions

Installable under pressure with a ball valve

ATEX, IECEx, and other safety certifications

Modbus/RTU, Modbus/TCP, 4-20 mA, and pulse/alarm outputs

Operates from -30 to +140°C (Non-Ex) and -30 to +90°C (Ex)

Data logging with wireless access via S4C-FS app

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Flow Range Calculator

The S451 Compressed Air Flow Meter is a robust and highly accurate thermal mass flow meter designed specifically for heavy-duty applications and hazardous environments. With its advanced insertion-type sensor, the S451 is perfect for monitoring compressed air and gas flow in a wide range of industrial settings, including those requiring explosion-proof equipment.

Key Features:

Durable Design: IP67-rated with stainless steel or nickel-plated components for corrosion resistance.
High Accuracy: Measures mass flow, standard flow, consumption, pressure, and temperature.
Data Logging: Built-in data logger with wireless access via the S4C-FS app for Android and iOS.
Easy Installation: Insertion sensor installable under pressure through a ball valve; rotatable sensor head for display visibility.
Comprehensive Outputs: Supports Modbus/RTU, Modbus/TCP, 4-20 mA analog outputs, and pulse/alarm outputs.
Explosion Proof: Certified for ATEX, IECEx, and other safety standards.

Specifications:

Medium: Air, N₂, O₂, CO₂, and non-corrosive gases.
Temperature: -30 to +140°C (Non-Ex), -30 to +90°C (Ex)
Pressure: 0 to 5.0 MPa (Non-Ex), 0 to 1.6 MPa (Ex)
Protection Class: IP67 (standard), IP65 (Ex option)

Ordering Information:

Available in standard configurations with options for different shaft lengths, gas measurements, and pressure ranges.

For more details, consult the product documentation or contact our sales team.

The S451 is designed to perform in demanding environments, making it ideal for a variety of industrial applications:

Chemical and Petrochemical Industries: Monitors gas flow, ensures safety in explosive atmospheres, and optimizes compressed air systems.
Oil and Gas: Measures gas flow in extreme conditions, maintains safety in hazardous locations, and monitors equipment efficiency.
Energy and Utilities: Manages compressed air in power plants, ensures pneumatic system reliability, and monitors emissions.
Food and Beverage: Maintains gas purity and quality, operates efficiently under all weather conditions, and reduces operational costs.
Pharmaceuticals: Monitors gases in manufacturing under strict safety conditions, ensures compliance, and enhances production efficiency.
Automotive: Manages pneumatic tools and machinery in robust environments, ensures efficient assembly lines, and reduces waste.
Metal and Mining: Measures gas flow in extreme conditions, ensures safety in explosive environments, and optimizes compressed air use.

Measurement
Flow
Accuracy	±(1.5 % of reading + 0.3 % full scale)
Selectable units	m³/h, m³/min, l/min, l/s, cfm, kg/h, kg/min, kg/s
Repeatability	0.25 % o.RDG
Sensor	Thermal mass flow sensor
Sampling rate	3 samples / sec
Turn-down ratio	200:1
Response time (t90)	0.5 sec
Consumption
Selectable units	m³, ft³, t, lb, l, kg
Pressure
Accuracy	0.5 % FS
Selectable units	bar, psi, kPa, MPa
Measuring range	0 ... 1.6 MPa (g) or 0 ... 5.0 MPa (g)
Sensor	Piezzo resistive sensor
Temperature
Accuracy	0.5 °C
Selectable units	°C, °F
Measuring range	-40 ... +120 °C
Sensor	Pt1000
Reference conditions
Selectable conditions	20 °C 1000 mbar (ISO1217), 0 °C 1013 mbar (DIN1343) freely adjustable

Signal / Interface & Supply
Analog output
Signal	2 x 4 ... 20 mA (4-wire), isolated
Scaling	0 ... max flow, freely adjustable
Load	Max. 400 Ohm
Update rate	Value updated ever 1 sec
Pulse/Alarm output
Signal	Switch output, normally open, max. 30 VDC, 200 mA
Scaling	1 pulse per consumption unit (selectable)
Alarm	Channel and threshold freely setable
Feldbus
Protocol	Modbus/RTU, Modbus/TCP
Supply
Voltage supply	16 ... 30 VDC
Current consumption	200 mA

General Data
Configuration
Wireless	S4C-FS App for Android and iOS
Others	3 touch button at display
Display
Integrated	Color graphics display
Material
Process connection	Stainless steel 1.4404 (SUS 316L)
Housing	Al alloy
Sensor	Stainless steel 1.4404 (SUS316L), 4J50 nickel plated, glass
Metal parts	Stainless steel 1.4404 (SUS 316L)
Miscellaneous
Electrical connection	Screw terminals
Protection class	IP67, Ex option: IP65
Approvals	CE, RoHS, FCC IECEx / GB : Ex db ib IIC T4 Gb Ex ib tb IIIC T135°C Db ATEX: II 2G Ex db ib IIC T4 Gb II 2D Ex ib tb IIIC T135°C Db
Process connection	S451: G3/4" (ISO 228/1) S453: Measuring section with R-thread or Flange
Weight	S451 300mm: 2.15kg S451 200mm: 2.08kg S453 without section: 1.86kg
Operating conditions
Medium	Air, N₂, O₂, CO₂ and other non corrosive gases
Medium temperature	S451: -30 ... +140 °C (applicable for Non-Ex-Option) -30 ... +90 °C (applicable for Ex-Option) S453: -30 ... +90 °C
Medium humidity	< 90 %, no condensation
Operating pressure	0 ... 1.6 MPa applicable for Ex-Option and A1558 option 0 ... 5.0 MPa applicable for Non-Ex-Option* of S451 with A1559 option 0 ... 4.0 MPa applicable for Non-Ex-Option of S453 with A1559 option *For pressure above 1.5 MPa use the installation device A530 1119 or A530 1120 to install S451.
Ambient temperature	-40 ... +65 °C
Storage temperature	-40 ... +70 °C
Transport temperature	-40 ... +70 °C
Pipe sizes	S451: >= DN25 S453: DN25 ... DN80