Operation Manual

2. Application
2. Application
The S 421 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 S 421 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 m
3
/h
and Total Consumption in m
3
. Other units can be set by the optional
display or the service kit.
The S 421 flow sensor is not developed to be used in explosive areas.
For the use in explosive areas please contact the manufacturer.
The S 421 flow sensor is mainly used in compressed air systems in
industrial environment.
3. 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 N
2
, Ar,
O
2
, CO
2
etc
• Optional display directly on the sensor, showing velocity, volume
flow and consumption
• Modbus interface (optional)
• Two gas calibration (optional)
S 421 7