Closed loop control adjusts the valve position to maintain the pressure monitored by the internal piezo-resistive sensor, in response to the externally signalled set-point
The modern digital approach to fluid pressure regulation, whether for laboratory use, hazardous area (Atex) or process control via Profibus, DeviceNet, RS232 or RS485 digital communication, is the Bronkhorst EL-Press digital pressure controller, says the company.
With a well-proven compact through-flow design, EL-Press controllers are available for absolute, gauge or differential pressure control, with ranges as low as inches wg.
Differential pressure can be controlled up to 15 bar, and the maximum pressure controller available is 700 bar.
Numerous styles of valve are available: integral or close coupled; direct acting, pilot operated, or bellows.
The EL-Press closed loop control adjusts the valve position to maintain the pressure monitored by the internal piezo-resistive sensor, in response to the externally signalled set-point.
The actual regulated pressure is relayed as an analogue and/or digital output signal.
With high accuracy and fast response time, examples of EL-Press applications are liquid chromatography, biotechnology fermenters, liquid level control in reaction vessels, CVD process and sputtering pressure control, and protective gas atmospheres.
Pressure control can be achieved for either upstream or downstream process conditions.
Bronkhorst has a wide capability associated with this technology, for example with all-metal sealed units, and many styles of electronic interface or display units to suit all control techniques.
