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Hi, this is the Industrial Control Assistant. With the development of the flow meter industry, steam flow meters have also come to be used in industrial automation. Do you know how many types of steam flow meters exist, and how are they installed and used? Let’s learn together!* Steam flow meter (1) Electrical principle: Instruments that utilize this principle include electromagnetic type, differential capacitive type, inductive type, strain gauge type, etc. (2) Acoustic principles: Flow measurement using acoustic principles includes ultrasonic types, acoustic types (shock wave types), and others. (3) Thermal principles: Methods for measuring flow rate using thermal principles include heat-type, direct calorimetry, indirect calorimetry, etc. (4) Optical principle: Instruments such as laser-type and photoelectric-type fall under this principle. (5) Based on physical principles: Nuclear magnetic resonance types and nuclear radiation types are instruments that operate according to such principles. (6) Other principles: There are the labeling principle (tracing principle, nuclear magnetic resonance principle), correlation principle, etc. Installation specifications for steam flow meters: 1. Steam flow meters come with a 4–20mA output as well as a pulse output. 2. The GPRS remote transmission device for steam flow meters must have a pulse input as well as a 4–20mA input. 3. It features power lightning protection and signal lightning protection (4–20mA). 4. The requirements for the instrument cabinet of the steam flow meter are as follows: it should be equipped with a UPS power supply, circuit breakers and sockets; the GPRS communication device, flow meter converter, etc. should be installed together in this cabinet, which should also be locked. 5. The stability of the instrument cabinet is ensured by cement blocks as a base; its protection rating is suitable for outdoor use, it has an insulating layer on top to prevent direct sunlight, and it features water-resistant properties. 6. An adequate straight pipe section must be left on one side inside the surface well to facilitate flow meter detection, comparison, and subsequent management. 7. When designing a flow meter, a straight pipe section with a length at least 10 times the nominal diameter (10DN) must be provided at the front end, and a straight pipe section larger than 5DN must be provided at the rear end to ensure accurate measurement. 8. The steam flow meter should be installed strictly in accordance with the instructions; after installation, the grounding resistance must be measured, and it should be below 10Ω. Equipotential bonding wires shall use multi-strand copper conductors, with a cross-sectional area of 16 mm2 or more; instrument grounding wires also use multi-strand copper conductors, requiring a cross-sectional area of 6 mm2 or more. That’s it for now. Have you learned today’s little tip? Learn every day with the little butler* – feel free to follow!