Gas Flow Pulsers

December 1, 2010

InterTech Development (Skokie, IL) has introduced MicroPulseTM, an alternative to mechanical syringes for producing small, short pulses of various gases. The solid-state unit measures 145 × 52 × 35 mm and contains a miniature heat exchanger and temperature control that can be fitted into process control circuits without adding volume. The unit delivers gases up to 1.75 scc/m at STP. The required flow during the pulse period is automatically controlled via an 8-bit digital interface by a PLC or other external controller. The user can pre-set flow direction, volume-flow, or mass-flow pulses over a wide temperature range. The system uses no moving parts, pneumatic valves, or small orifices, and does not require a compressed-air source. Multiple different flow values can be produced in quick succession as required.