Thermal Flowmeters use a constant temperature differential (ΔT) technology to measure mass flow rate of air and gases. The thermal mass flow sensor consists of two Resistance Temperature Detectors (RTD’s).
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FT2A
FT2A
BASIC DESCRIPTION
*Power Supply:DC 24V, AC 85~264V
*Output: DC 4 to 20mA
Pulse, RS485 Modbus
*Display: LCD Indicating
*주위온도:-40 to158°F (-40 to 70°C)
*Enclosure:Ex-Proof, NEMA 4X
*정확도:±1% RD; ±0.2% FS
*최대범위:15 to 60,000 SFPM (0.07 to 280 NMPS)
*온도 정확도:±1.8ºF (±1.0°C)
*반응시간:0.9초
*반복성:±0.2% of FS
*최대압력:500 psig (34.5 barg)
*공정온도:-40 to 650°F (-40 to 343°C)
PRINCIPLE
*Reference RTD measures temperature of the gas
*Power to the heated element is regulated by the electronics
*A constant ΔT is maintained
*As mass flow increases, the gas molecules remove heat from the heated element
*Sensing the ∆T reduction, the electronics adds power to maintain a constant ∆T.
*The amount of power applied to the heated element is proportional to the mass flow rate
*The microprocessor linearizes these signals
APPLICATION
*Waste Water Treatment Plants (WWTP)
*Aeration Air
*Bio Gas
*HVAC/Building Automation
*Natural Gas and Air Applications
*Boiler, Furnace, Oven manufactures etc.