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SMART TYPE DIGITAL THERMAL MASS FLOW METER MF250A SERIES FOR LIGHT INDUSTRY, OEM DESIGN
COMPACT AND LIGHT-WEIGHT THERMAL MASS FLOW TRANSMITTER FOR  LIGHT INDUSTRY, OEM DESIGN.


<<< Feature & Application >>>

*Wide turn-down ratio  
*4-20 mA 4-wire analog output  
*Pulse, Alarm ( Hi-Lo), RS485, Modbus 485
*Low cost and fast delivery                          
*1.0 % accuracy of reading
*No moving parts  
*Pulse Scaling
*Low Flow Cutoff Adjustemnt
*Damping Time Adjustment
*K-factor Adjustment
*Local Display : 3-1/2 LED Snap-Quick-Plugging
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PDF View : 00-CATALOG-MF250A-EN-2008.pdf
  • <<<   General  >>>
  • . The MF250A series for light industries including HVAC flow velocity transmitter which is
  • .  based on constant differential temperature technology for air and other process gases
  • .  in range from 0 ~250 NMPS .
  • .  Because neither temperature nor pressure measurements are required, MF250A series
  • .  reduces installation cost and vastly improves system accuracy.
  • .  The meter is easily installed or retrofitted with minimum down time and provides
  • .  superior long-term process reproducibility and easy serviceability.
  • .  MF250A insertion flow meters are available in probe sizes from 4¡± to 36¡± with either
  • .  compression or flange connection.
  • .  The tranducer provides a 4-20 mA linear ouptut signal and optionally an RS485
  • .  serialized digital output signal. Other analog outputs are also available.
  • .  MF250A series flow meters utilize a Constant Temperature Differential (dT)
  • .  Technology.
  • .  The sensor has two elements. The reference RTD measures the gas temperature.
  • .  The electronics heats the Heated Element above the gas temperature. It is the job of
  • .   the electronics to maintain a constant dT between the Gas temperature and the
  • .   heated element.
  • .  As the mass flow increases, the increased numbers of gas molecules remove more
  • .  heat from the Heated Element. The electronics senses this temperature reduction and
  • .  adds additional power in order to maintain a constant dT.
  • .  The amount of power delivered to the Heated Element is just proportional to
  • .  the mass flow rate .
  •  
  • [ Technical Specification ]
  • < Accuracy >                                                    
  • ¡¾1.0 %  Reading                                              
  • Straight pipe run : 10 x ID (Up-stream) for Insertion meter   5 x ID (Down-stream) for insertion meter .    
  • < Output >
  • 4~20 mA DC, Pulse, RS485, Modbus 485, Alarms ( High-Low)
  • < Repeatability >                                                    
  • ¡¾0.2 % Full Scale                                          
  •                                    
  • < Response time >
  • 0.9 sec ( 63% one time constant )        
  • < Power Supply >
  • 24 VDC 0.2 Amp, Reverse Power Protection, Built-in Surge Protector
  •      
  • < Gases >                                                          
  • Air, Argon, Nitrogen, Oxygen, Methane, Propane, Butan, Carbon Dioxide, Butane, Natural Gas, Digester Gas,  Hydrogen, Ammonia, Mixed Gas, Others                        
  • < Flow units >                                                      
  • Nm3/hr, Nm3/min, Kg/day, Kg/hr, Kg/min, Kg/sec, SCFM, SCFH, Lb/day, Lb/hr, Lb/min, Lb/sec, NLPH, NLPM, SLPM, SMPS, NMPS, SFPM                
  •                                                                  
  • < Flow Velocity >                                              
  • 0 ~ 100 NMPS ( standard)-based on Air at 0¡É 1 atm            
  • 0 ~ 250 NMPS ( option )-based on Air at 0¡É 1 atm            
  • To determine if insertion flow meter will operate, prpoperly divide the maximum flow rate by the pipe area.    
  •    
  • < Flow rates for common pipe sizes >              
  • 1-1/2 .inch...........0  ~ 760 Nm3/H................0 ~  16 SCFM
  • 2 inch..................0  ~ 1280 Nm3/H...............0 ~  48 SCFM
  • 3 inch..................0  ~ 2720 Nm3/H...............0 ~ 120 SCFM
  • 6 inch..................0  ~ 10870 Nm3/H..............0 ~ 192 SCFM
  • 8 inch..................0  ~ 18860 Nm3/H..............0 ~ 332 SCFM
  • 10 inch.................0  ~ 30920 Nm3/H..............0 ~ 450 SCFM
  • 12 inch.................0  ~ 42300 Nm3/H..............0 ~ 750 SCFM
  • ( note : reference gas  Air, Standard condition Nm3/hr : 0¡É/1 atm  , SCFM : 70¡ÆF/1 atm)
  • < Dimensional Specification >
  • Probe diameter : 1/2-inch with insulation , Coupling 1/2-inch NPT
  • Sensor Material : Stabdard ( 316 SST ), Optional ( Hastelloy-C )
  • < Equation for selecting insertion probe length >
  • Probe length = 1/2 pipe ID + thickness of insulation + diameter of retractor or,
  • ball valve , or fitting , or flange.
  • <Enclosure>
  • Weather-Proof NEMA4X, IP66 Non-Hazardous Area
  • for remote use NEMA 4X J-Box
  • < Remote Cable >
  • 3 conductor w/shiled 2.0sq , 100 meter max, for longer length consult factory
  • < Gas pressure,  maximum >                                                                              
  • 500 psig ( 34.5 barg )                                                                                  
  • Note : pressure rating based on 38¡É ( 100¡ÆF)
  • < Gas Temperature >
  • Standard   : -40 ~ 121 ¡ÆC, High Temperature : 0 ~ 204 ¡ÆC, Ultra High Temp.: 0 ~ 343¡ÆC
  • Enclosure : -40 ~ 80 ¡ÆC without LED Display , 0 ~ 70 ¡ÆC with LED Display
  • ////////////////////////////////////////////////////////////////////////////////////                                                                              
 
 
 
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