Digital Control/Readout Electronics and Power Supply For Mass Flow Controllers Features Model 951 ■ 5 digit LED display ■ Front-panel pushbutton set point, calibration and alarms ■ Integral power supply (+/- 15 VDC) ■ Compact size-1/8 DIN ■ CE Approved Model 954 ■ 4 line, 20 character LCD display ■ Valve Close, Valve Open (Purge) pushbutton override ■ Front-panel menu adjustable: Flow units ■ Set Point ■ Totalizer ■ Gas K-factors ■ Alarms ■ Master/Slave Ratio Control ■ Calibration ■ Analog Outputs: 0 to 5, 0 to 10 VDC and 4 to 20 mA ■ Digital Output: RS-232 and RS-485 ■ CE Approved For information online... www.sierrainstruments.com Description ierra Instruments' FloBox™ Models 951 and 954 include a compact, single channel device for operation of one mass flow meter or controller and a deluxe, multi-channel device for operation of up to four devices. Designed specifically for use with the Sierra Model 830 flow meters and Model 840 flow controllers, both of these powerful digital systems supply power (+/- 15 Vdc), display the flow rate, and offer set point control for MFC's. The Model 951 is an ultra-compact digital device that is designed to operate a single unit. In addition to power, readout and set point, it offers multiple alarm points and can be easily calibrated in the field to operate both new and existing devices. It is designed for easy panel mounting (1/8 DIN). An optional stand facilitates benchtop usage. The Model 954 is a state-of-the-art digital system that can operate up to four units. In addition to power, readout and set point, it offers front-panel override for valve shut and purge functions for MFC's, user programmable K-factors for different gases, engineering units, alarms, independent totalizer for all four channels, master slave ratio control and multiple alrarms. It also offers both RS-232 and RS-485 communication via rear-mounted serial ports. The Model 954 is designed for easy panel mounting (1/2 rack) and includes a convenient stand for benchtop usage.

Dimensional Specifications Model 951 Dimensions All dimensions are inches. Millimeters are in parentheses. Operating Specifications Ambient Temperature 32° to 120°F (0° to 50°C) Storage Temperature -5° to 160°F (-20° to 70°C) Relative Humidity 0 to 50% non-condensing Power Requirements Model 951 ��������������100, 110 or 240 VAC (specify when ordering), 50/60 Hz Model 954 ������������100, 110 or 240 (+/- 10%) VAC, switch selectable, 50/60 Hz Power Output Model 951 ������������������� +/- 15 VDC, 250-500 mA Model 954 ����������������� +/- 15 VDC, 250-400 mA per channel Signal Input Model 951 �������������������...