Benefits 3 2 1 4 S401 / S421 Flow and Consumption Meter S401 can be installed under pressure through a 1/2" ball valve S421 with measuring section for accurate and reliable readings No additional pressure or temperature compensation, thanks to thermal mass flow measurement Fast response time with a wide measuring range Measurement of different process gases like: N2, CO2, O2 and many other technical gases On-site display for live value readings, total consumption counter and convenient sensor settings. Totalizer with 10 digits (1 999 999 999) Optional Color Display 1 The industrial IP65 Polycarbonate-ABS housing offers the best protection in rough environments. The metal parts are made from high grade stainless steel, made to last forever. Robust Materials 3 2 S401 and S421 thermal mass flow meters are perfectly suited to be integrated into process controls or high-level monitoring systems. Various output options are offered for a seamless integration: • Isolated 4... 20 mA output for actual flow readings • Isolated Pulse output for totalizer • Modbus/RTU to read all values digitally • Modbus/TCP with PoE support to connect the meters to the local network and power them via Ethernet Various Outputs • The insertion type flow meters supports any pipe size from 1" up to 12" or even bigger pipes. Thanks to the insertion through a 1/2" ball valve, the S401 can be installed under pressure and is perfectly suited for installations where shutdowns are not acceptable. • The in-line type are offered with measuring sections from 1/2" up to 3" and can be easily integrated into existing piping systems. Flexible and Easy Installation 4 5 5 Thermal Mass Flow Sensor The build in sensor is using the thermal mass flow principle. This comes with main advantages: • The sensor can cover a wide measuring range at high accuracy. • The fast response times, no moving parts and minimal pressure loss are making them most suited sensors for volumetric flow and consumption measurement of compressed air and gases. • There is no need to compensate the line pressure and temperature additionally, making them most efficient in terms of installations and costs. 2/8
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