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JC010 Insertion Type Thermal Mass Biogas Flow Meter

Parameters of JC010 Insertion Type Thermal Mass Biogas Flow Meter

The thermal mass flow meter is a kind of instrument that uses the heat transfer principle, heat exchange relation between flowing fluid and heat source, to measure the mass flow of gas. It can be divided into heat distribution effect and heat dissipation effect according to the heat effect that gas affects the heat source of the sensing element. The thermal mass flow meter uses a heat dissipation effect to directly measure the mass flow of gas, which makes it have advantages of little pressure loss, wide measurement range, high accuracy, high repeatability, and no moving parts and so on. And the significant advantages make thermal mass flow meter become popular in industrial process control in both the domestic and international industry.

JC010 Insertion Type Thermal Mass Biogas Flow Meter

Description

The thermal Mass Gas Flow Meter principle is that a fluid flowing past a heated temperature sensor removes a known quantity of heat as it passes. In a thermal flowmeter, the fluid has to pass two temperature sensors. One sensor obtains a reference value by measuring the actual process temperature. The second sensor is a heating element and it receives precisely as much energy as is needed to compensate for dispersed heat and maintain a precisely defined temperature difference.

Thermal mass gas flowmeter

The higher the mass flow past the heated temperature sensor, the more heat is dissipated and the more power has to be input to the element to maintain the temperature difference.

Heating current, therefore, is a measure of the mass flow of the gas.

The sensor temperature is always 30℃ higher than the medium temperature (environment temperature), and the meter adopts method of constant differential temperature, therefore the meter does not need to do temperature and pressure compensation in principle.

thermal mass gas flow meter working principle
thermal mass gas flow meter working principle

The sensing element

includes two resistance-type temperature detector(RTD), which are protected by heat casings. When measuring gas, one RTD (heated RTD) is heated, and another one(reference RTD) measures the temperature of the gas. When the sensor is in medium with no flow, the two RTD will have a temperature difference (ΔT)

because of the action of the heater. And when the medium flows, the molecule of the medium will take away some heat from heated RTD because of the principle of heat conduction, and the temperature of reference RTD will remain the same. Power of heated RTD (ΔP), temperature difference (ΔT), and mass flow of gas (Q) have function relation, which is as follows:

ΔP/ΔT=K1+K2 •(Q)K3

Based on the above function, it can be divided into temperature detection method and power measurement detection method according to different

variables.The former, also known as the constant power method, refer to keep constant power(ΔP) of heating temperature sensors to provide heat, then measures the temperature difference value(ΔT) that changes with the flow; the latter, also known as the constant temperature difference method, refers to keep constant temperature difference(ΔT) between the heating element and measured

fluid, then controls and measures the power(ΔP) of heating temperature sensors, and the power consumption will increase with the increment of flow.

Additional information

Medium

Single gas ( except acetylene gas) or mixed gas of fixed

Pipe size

DN15-2000mm

Velocity

0.1Nm/s~100Nm/s ( standard working condition 20 ℃101.33Kpa)

Accuracy

+1%

Medium temperature

-40~200℃

Pressure

2.5Mpa to 4Mpa

Power supply

AC220V or DC24V for integral converter and AC220V for split converter.

Signal output

4~20mA RS-485,Modbus

Display

Instantaneous flow , mass flow , volume flow , cumulative flow ,Beijing time, running time.

Explosion proof degrade

Exd IΙ CT 4

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