Thermal Mass Flow Meters

admin — Fri, 15 Dec 2006 12:50:43 +0000

Thermal Mass Flow Meters

Thermal Mass Flow Meters are used for the measurement of flow rate of liquid or gas in industrial processes (ventilation, fermentation, flotation)…

Thermal Mass Flow Meters Characteristics

measurement accuracy does not depends on fluid pressure or temperatures
no moving parts
digital readings of how much gas or liquid has flowed through device
programmable measurement parameters
microprocessor controlled devices

Tthermal mass flow meter principle of operation

Thermal mass flow meters have two sensors. One of the sensors is constantly heated (flow sensor) and the other sensor (reference senasor) measures fluid or gas temperature. As fluid flows by the flow sensor, fluid molecules absorb heat away from the surface and the sensor cools. The amount of heat required to maintain constant temperature is proportional to the flow rate.

Typical Thermal Mass Flow Meter Device

LCD display	Liquid Crystal Display gives visual reading of thermal mass flow meters device	Integrated or external mount
Output		Analog or digital
Response speed	How quickly thermal mass flow meters instruments begins to read	From 10 milliseconds to 3 seconds
Process temperature rating		Different range
Additional data	Additional process data reading	Volumetric flow rate, line temperature or line pressure
Communications	Connection to computer interface	RS-485, RS-232, DeviceNet

Applications:

compressed air monitoring
natural gas
wastewater
flare gas monitoring
combustion air
chlorine metering
fuel flow
natural gas
carbon dioxide
bio gas
oxygen
flare hydrogen
argon
nitrogen
digester gas