The energy consumption ratio of a micro centrifugal pump refers to the ratio of the pump's output power to its input electrical power, usually expressed as η, and is an important indicator for measuring the pump's energy efficiency. The following are general steps for calculating the energy consumption ratio of a micro centrifugal pump:

1. Measure the pump's flow rate and head: First measure the pump's flow rate and head, which are the basic data for calculating the pump's energy consumption ratio.

2. Calculate the pump's output power: The pump's output power is usually calculated using the following formula: P = ρQH/η, where ρ is the liquid density, Q is the flow rate, H is the head, and η is the pump's efficiency. It should be noted that the power unit here is watt (W).

3. Measure the pump's input electrical power: Measure the pump's input electrical power, usually measured using an electrical power meter, in watts (W).

4. Calculate the pump's energy consumption ratio: The pump's energy consumption ratio can be calculated using the following formula: η = Pout / Pin, where Pout is the pump's output power and Pin is the pump's input electrical power.

It should be noted that the pump efficiency η is a key parameter, which usually needs to be measured or estimated through experiments or simulation calculations. In addition, the pump energy consumption ratio is also affected by many factors such as the pump design, operating status, and liquid properties. Therefore, in practical applications, these factors need to be considered comprehensively and optimized and adjusted according to specific circumstances to improve the pump's energy efficiency and reduce energy consumption.