Working principle of KMC-M monaural gas ultrasonic flowmeter

The working principle of KMC-M monaural gas ultrasonic flowmeter is based on the method of measuring the time difference between the propagation of ultrasonic pulses downstream and upstream of the gas.The measurement time difference proportional to the flow rate is converted into gas volume flow rate.

The KMC-M monaural gas ultrasonic flowmeter includes an electroacoustic transducer (PEA), a measuring section, and a signal processing device.

The measurement section can be composed of the KMC-M monaural gas ultrasonic flowmeter body, or it can use a section of the existing pipeline (cut in design).The signal processing device generates a transmitter for the KMC-M monaural gas ultrasonic flowmeter and produces a standard output signal to transmit gas flow rate and volume under operating conditions.

In the version with built-in calculator, the signal processing device also receives current signals from temperature and pressure sensors, calculates flow rate and calorific value under standard conditions, and records the readings in a log.

Depending on the version, the flow meter may include a flow preparation device:

• Straight line segment, including the location where temperature and pressure sensors are installed

• A flow regulator that eliminates the influence of local resistance

• Gas purification device - recommended for contaminated gases

• Silencer - It is recommended to use a flowmeter installed after a pressure regulator that operates under critical gas flow conditions.

The factory calibration and validation of flow meters can be carried out by incorporating all components included in the flow meter into the measurement pipeline (higher precision versions in special orders).

application area

A flow meter with a built-in flow computer, equipped with temperature and pressure sensors, can be used to measure volumetric flow under standard conditions.All components of the complex operate under full range operating conditions (-50..+50 ° C, IP67).

Advantages compared to other types of flow meters

Compared to turbine, differential, and mechanical flow meters:

• Wider dynamic range: from 1:100 to 1:400 (4% level)

• No flow obstruction: There is no possibility of pressure loss or damage to flow meter components;

• Lack of moving parts and the need for maintenance

• Bidirectional flow measurement;

Compared to Coriolis mass flow meters

• Measure under low pressure and flow rate;

• The ability to handle contaminated gases.