**Question:**Which of the following is not an instrument used to measure flow by volume?- ○ Turbine flow meter- ○ Ultrasonic flow meter- ○ Thermal flow meter- ○ All of these

Intriduction A flow meter is a device that measures the linear or nonlinear mass and volumetric flow of a liquid or gas. Flow meters are also known as flow gauges, flow indicators, liquid meters, and flow rate sensors. Their names are determined by their industrial application. They are an excellent investment for increasing efficiency since they require little maintenance, are simple to operate, and are adaptable and long-lasting.Which of the following is not an instrument used to measure flow by volume? Answer: Thermal flow meter. Reason: Thermal mass flow meters are intended to precisely monitor and quantify the mass flow (rather than volumetric flow) of clean gases, a temperature-independent property. As a result, no compensation for variations in gas temperature, pressure, viscosity, or density is required for the thermal mass flow meter. Hence the third option is the correct option. The thermal flow meter is not an instrument used to measure flow by volume. Result: All flow meters are used to measure volumetric flow rate, except the thermal flow meter, which is not used to measure flow by volume.