Overview-Thermal mass flowmeter
Thermal mass flow meters are designed to accurately monitor and measure mass flow (as opposed to measuring volumetric flow) of clean gases, a parameter that is not temperature-dependent.
Therefore, the thermal mass flow meter does not require a correction for changes in gas temperature, pressure, viscosity, and density.
Thermal mass flowmeter Principle
Thermal mass flow meters employ the thermal dispersion principle whereby the rate of heat absorbed by a fluid flowing in a pipe or duct is directly proportional to its mass flow. In a typical thermal flow meter gas flowing over a source of heat absorbs the heat and cools the source.
As flow increases, more heat is absorbed by the gas. The amount of heat dissipated from the heat source is proportional to the gas mass flow and its thermal properties. Therefore, measurement of the heat transfer supplies data from which a mass flow rate may be calculated.
FEATURES
PRODUCT BENEFITS
Mass & Volumetric flow monitoring of most clean gas
- The foremost advantage is fixed parts
- Withstands changes in density, viscosity, temperature, and pressure
- Not affected by changes in gas volume
- Easy to maintain with a low maintenance cost
- Capable of operating in both directions
Easy to Install, lots of field installation options
Rugged, long-lasting design for the toughest applications
SPECIFICATIONS
Pipe diameter:3/4″inch to 80″inch
Accuracy:1.5%，2.5%
Repeatability:0.5%,0.67%
Pressure rate:≤16 Bar,≤25 Bar,≤40 Bar
Temperature:≤250℃(Normal)，≤350℃(High temperature)
Velocity:0.1-70m/s
Ambient temperature:
Operating: -20° to 60°C
Storage: -40° to 65°C
ELECTRIC
Power supply:90-250VAC,24VDC 500mA
Output signal:
- 4-20mA
- Pulse
- User-definable pulse output for totalized flow
Digital communications: RS485, Hart
Hazardous-Area Location Enclosure
CONNECTION TYPE
Wafer type
REMOTE TYPE
Insertion type
APPLICATION
SUPPORT FILES
Drawings
- inline Thermal mass Flowmeter 1“ inch drawing
- inline Thermal mass Flowmeter 1.5“ inch drawing
Program
- RS485 Protocol
- Hart Protocol
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