User manual FGT TMFC50A 2009

[. . . ] FGT® Model TMFC Mass Flow Controller/Meter Installation and Operation Manual U-TMFC--EN Part number:0912TWAD October, 2009 FGT® Model TMFC Mass Flow Controller/Meter Installation and Operation Manual U-TMFC--EN Part number:0912TWAD October, 2009 Essential Instructions Read this page before proceeding! FGT designs, manufactures and tests its products to meet many national and international standards. Because these instruments are sophisticated technical products, you must properly install, use and maintain them to ensure they continue to operate within their normal Mass Flow Controller specifications. The following instructions must be adhered to and integrated into your safety program when installing, using and maintaining FGT products. Read all instructions prior to installing, operating and servicing the products. [. . . ] CAUTION: Never wash the piping system after incorporation of this instrument. Ignoring it may cause a critical malfunction. 4-3. In-line Filter It is recommend that an In-Line be installed upstream from the controller to prevent the possibility of any foreign material entering the flow sensor or control valve. The filtering element should be replaced periodically or ultrasonically cleaned. (Auto Shutoff) prevents the valve from opening whenever the set-point is less than 2% of full scale. Permits the user to clean or replace the sensor Prevents possible damage to delicate data acquisition devices by limiting the output to -0. 7~+6. 8 Vdc on the voltage signal output and 0~26 mAdc on the current output Set-point(Command): Low Command Valve Inhibit: Removable Cleanable Sensor: Output Limiting: 4-5. Use of The conversion Tables When operating Model TMFC-Series Mass Flow controller correctly, design the piping system so that the pressure difference between the inlet and outlet. If a mass flow controller is operated on a gas other than the gas it was calibrated with, a scale shift will occur in the relationship between the output signal and the mass flow rate. This is due to the difference in heat capacities between the two gases. This scale shift can be approximated by using the ratio of the molar specific heat of the two gases. A list of sensor conversion factors is given in Table 4-1 to change to a new gas. Multiply the output reading by the ratio of the gas factor for the desired gas to the gas factor for the calibration gas. It is generally accepted that the mass flow rate derived form this equation is only accurate to ± 5%. The sensor conversion factors given in Table 4-1 are calculated based on a gas temperature of 21 and pressure of one Atmosphere. The specific heat of most gases are not strongly pressure and temperature dependent, however gas conditions that vary widely from these reference conditions may cause an additional error due to the change in specific heat due to temperature or pressure. Actual Gas Flow and Operational Pressure Calculated www. fgttw. com -13- www. fgttw. com -14- FGT® Model TMFC Mass Flow Controller/Meter Table 4-1 Conversion Factors(Nitrogen Base) Installation and Operation Manual U-TMFC--EN Part number:0912TWAD October, 2009 FGT® Model TMFC Mass Flow Controller/Meter Table 4-1 Conversion Factors(Nitrogen Base) Continued Installation and Operation Manual U-TMFC--EN Part number:0912TWAD October, 2009 www. fgttw. com -15- www. fgttw. com -16- FGT® Model TMFC Mass Flow Controller/Meter Table 4-1 Conversion Factors(Nitrogen Base) Continued Installation and Operation Manual U-TMFC--EN Part number:0912TWAD October, 2009 FGT® Model TMFC Mass Flow Controller/Meter Installation and Operation Manual U-TMFC--EN Part number:0912TWAD October, 2009 4-6. Gas Connection The standard joints of the TMFC30/50/125-Series Mass Flow Controller are 1/4" Compression (SwagelokTM) or the equivalent on both of the inlet and outlet. The standard joints of the TMFC50-Series Mass Flow Controller are 3/8" Compression (SwagelokTM) or the equivalent on both of the inlet and outlet. 4-7. Installation When designing the piping system employing the Mass Flow Controller, pay particular attention to that this instrument may have to be removed for maintenance jobs such as inspection and disassembling washing. Take into full consideration the arrangement having a space enabling easy removing and reinstallation piping jobs. During installing this instrument, pay particular attention so that no foreign matters intrude from the inlet or outlet. Hold attaching the protective caps on the both ends until the installation. Install Model TMFC-Series Mass Flow Controller in a clean-dried place in which no impacts and vibration occur. Secure a sufficient space allowing span or zero-point adjustments. [. . . ] Detective printed circuit board Command input floating Output signal stays at +6. 8V regardless of command and there is flow through the controller. Replace printed circuit board. for Refer to Fig-1&Fig-2&-Fig-3 assignments. terminal Output signal follows set-point at higher commands but will not go to zero. Output signal follows set-point at lower commands but does not reach full scale Partially clogged valve Valve out of adjustment Valve guide spring failure Controller grossly out of calibration. [. . . ]