EL-FLOW Select F-201CV
These gas mass flow controllers & meters can be paired with your pressure reactor to allow accurate measurement and control of flow ranges between 0,16…8 mln/min and 0,5…25 ln/min at operating pressures between vacuum and 64 bar.
The mass flow controller consists of a thermal mass flow sensor, a precise control valve and a microprocessor based PC board with signal and fieldbus conversion. As a function of a setpoint value, the flow controller swiftly adjusts the desired flow rate.
Key features of these mass flow controllers include:
• High accuracy
• Fast response, excellent repeatability
• Optional Multi Fluid / Multi Range functionality
• Virtually pressure and temperature independent
• Compact design
The EL-FLOW Select series are equipped with a digital pc-board, offering high accuracy, excellent temperature stability and fast response. The main digital pc-board contains all of the general functions needed for measurement and control. In addition to the standard RS232 output the instruments also offer analog I/O.
As an option, an on-board interface can be mounted to provide CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS protocols. The EL-FLOW® Select design features optional Multi Gas / Multi Range functionality, providing (OEM-) customers with optimal flexibility and process efficiency.
Other models/specifications are also available.

EL-PRESS P-502C
The Bronkhorst Digital Electronic Pressure Meter range are suited for precise measurement of pressure ranges between 2…100 mbar and 1,28…64 bar absolute or between 0,7…35 mbar and 1,28…64 bar gauge. These transducers (or EPT) have a well-proven compact thru-flow design and includes a diaphragm type piezo-resistive pressure sensor, a microprocessor based pc-board with signal and fieldbus conversion and a PID controller for optional pressure control by means of a separately mounted control valve.
EL-PRESS series are equipped with a digital pc-board, offering high accuracy, excellent temperature stability and fast response. The main digital pc-board contains all of the general functions needed for measurement and control. In addition to the standard RS232 output the instruments also offer analog I/O. As an option, an on-board interface can be mounted to provide CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS protocols.
Key features of the digital electronic pressure meter include:
• For absolute or gauge pressure
• High accuracy and repeatability
• Well proven, compact thru-flow design
• On-board PID controller for pressure control
• Analog, RS232 and fieldbus communication
How does it work?
The Bronkhorst EL-PRESS pressure sensor is a piezoresistive bridge on the surface of a silicon chip. This chip is drilled out on its reverse side, giving the inside of the chip the form of a pressure diaphragm, whose thickness determines the pressure range. When a pressure acts on this chip, the diaphragm flexes, and the resistor values of the bridge alter in proportion to the pressure. The measuring cell is separated from the external pressure by a thin, sensitive stainless steel diaphragm, and the sealed off cavity between diaphragm and cell is filled with oil.
Other models/specifications are also available.