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            | Model Number | Descriptions | Temperature | Power Requirements | Signal Input  | Features |  
            | Power Output | Signal Output |  
            | Digital Flo-Box 951 
 | Digital Control/Readout Electronics and power Supply For Mass Flow Controllers. One Channel | Ambient: 0℃~50℃. Storage: -20℃~70℃. | 100 , 110  240 VAC, 50/60 Hz | 0-5 VDC | *5 Digital LED Display. *Front-Panel pushbutton set point, calibration and alarms. *Compact size:1/8 DIN |  
            | ± 15 VDC  250~500 mA | 0-5 VDC (2 alarms) |  
            | Model Number | Descriptions | Temperature | Power Requirements | Signal Input | Features |  
            | Power Output | Signal Output |  
            | Digital Flo-Box 954 
 | Digital Control/Readout Electronics and power Supply For Mass Flow Controllers. Four Channel | Ambient: 0℃~50℃. Storage: -20℃~70℃.   | 100 , 110 or 240 VAC selectable, 50/60 Hz | 0-5  0-10 VDC 4-20 mA | *4 line, 20 character LCD display.
 *Valve Close, Valve Open(Purge) pushbutton override. *Front-panel menu includes: Flow units, Set point, Totalizer, Gas K-factors, Alarms, Master/Slave Ratio Control, Calibration. |  
            | ± 15 VDC  250~400 mA Per channel. | 0-5 0-10 VDC 4-20 mA (2 alarm per channel) |  
            | Model Number | Descriptions | Typical Applications: | Power Requirement | Inputs | Features |  
            | Compod for 100 series 
 
 | Advanced Automation for SIERRA 100 Series Instruments. | *Process Monitoring. *Leak Testing. *Gas Mixing and Blending. *Batching. | 24 VDC | RS-485 MODBUS RTU. 0-10V. 0-20 mA. | *RS-485 Communication with MODBUS RTU protocol allows digital multi-drop networks. *Two digital outputs and one analog input can be configured by user with MODBUS or included software for a wide variety of process controls. *Available with optional LCD display. |  
            | Output |  
            | RS-485. MODBUS RTU,  Optically Isolated. Analog Pluse. |  |