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SFM5400 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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SFM5400 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
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6 / 12 page  CMOSens SFC5400 / SFM5400 Mass Flow Controller / Meter for Gases www.sensirion.com October 2016 – V12 6/12 3 Electrical and communication specifications 3.1 Connector and pin layout (digital, analog + Aux RS485, analog) SFC5400 / SFM5400 feature the following analog and digital communication interfaces: Analog: 0-5 V, 0-10 VDC, 4-20 mA Digital: RS485, DeviceNet, IO-Link Detailed specification of the digital communication protocols can be found on the Sensirion website. The electrical connector of the SFC5400 / SFM5400 is a standard HD Sub-D 9pin. This enables an easy and reliable universal connection. See the pin layouts for different interface versions below: Figure 8: Digital interface version (RS485, DeviceNet and IO-Link). This version has the order code “L” (see Sec. 6). Figure 9: Standard analog only interface versions (0-5VDC, 0-10VDC, 4-20mA). These versions have order codes “U”, “W”, and “C” respectively (see Sec. 6). *GND pins are interconnected on the PCB of the device. Figure 10: Analog interface versions (0-5VDC, 0-10VDC, 4- 20mA) with auxiliary RS485 interface for extended functionality. RS485 interface is for service purposes only, e.g. it is not possible to set the set point using RS485. These versions have order codes “Q”, “R”, and “S” respectively (see Sec.0). Note that the pin layout of this version is not compatible to our analog only devices shown in Figure 9. *GND pins are interconnected on the PCB of the device. 3.2 Power supply The SFC5400 / SFM5400 mass flow controller / meter requires a standard voltage supply of +14.0 to + 26.0 VDC. There are no stringent requirements for voltage ripple and stability because of the internal voltage regulation. 3.3 Installation instructions for voltage or current controlled devices It is important to use completely independent signal ground lines for each device. Interconnection of signal ground lines between each other or with supply ground will lead to wrong operation of MFC / MFM devices. Ground pins for signal and supply circuits are interconnected on the PCB of the device. 3.4 Valve override inputs (analog versions) The valve of the SFC5400 mass flow controller is a “normally closed” type. For security reasons the SFC5400 mass flow controller is equipped with two valve override functions: Purge Mode: Setting 5VDC to pin 9 fully opens the control valve ignoring any set point. Shut Mode: Setting 5VDC to pin 1 fully closes the control valve ignoring any set point. |
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