Seek an economical positive displacement flow meter for flow measurement in lubrication equipment

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Positive displacement flow meter 1: The medium is gear lubricating oil or anti-wear hydraulic oil, with a maximum viscosity of ISOVG680. 2. Not for measurement purposes; the detection accuracy is within 5%. 3. Operating temperature: 0~100°C. 4. The flow signal output is 4-20mA. 5. Particles up to 200 micrometers are allowed in the medium. 6. The service life is at least 2 years. 7. There are two types: low pressure and high pressure. The nominal pressure required for low pressure is 4 MPa, while that required for high pressure is 40 MPa. 8. The low-pressure range is 25 L/min. The high-pressure range is 10 L/min. 9. The allowable pressure loss at low pressure is 0.3 bar. The allowable pressure loss at high pressure is 3 bar. 10. The low-voltage cost is within 300 yuan. The high-pressure cost is within 500 yuan. Technical challenges: 1. Resistance to impurity particles. 2. The low pressure loss should be small. 3. The cost must be low.