Toxic gas monitoring

04/01/1998

Mass flow controller

Mass-Trak measures and controls gas mass flow rates at low cost, in analytical, laboratory, and OEM instrument applications. Its on-board display and local setpoint potentiometer allow for adjustment of the command signal from the face of the instrument enclosure and eliminate the need for external readout/setpoint electronics. The instrument also offers a switch-selectable remote setpoint capability from either a 4-20 mA, 0-5 Vdc, or 0-10 Vdc command signal, which can be easily interfaced with a process control system or workstation. Mass-Trak`s control valve features include both a purge mode and a valve close command from an external contact, a 1-sec response to setpoint changes, and a 0.25% repeatability specification. The flow controller is available in any range from 0-10 sccm to 0-50 slpm. Sierra Instruments Inc., Monterey, CA; ph 800/866-0200, fax 408/373-4402, www.sierrainstruments.com.