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EPI Flow Meter: Eldridge Products Thermal Mass Gas Measuring Systems
Quick Answer: EPI thermal mass flow meters from Eldridge Products measure gas mass flow directly. You do not need separate temperature or pressure compensation. Silver Automation Instruments supplies these meters to industrial users in the Middle East, Africa, Southeast Asia, and Oceania. Send us your gas type, pipe size (DN), pressure (bar), and temperature (°C) for a price quote.
How the EPI Thermal Mass Flow Sensor Works
An EPI flow meter uses two platinum RTD sensors, usually PT100 class, inserted into the gas stream. One sensor measures the gas temperature. The other sensor is heated with a constant power or constant temperature difference. The cooling effect of the gas flow on the heated sensor changes the heat transfer rate. The meter electronics convert this signal into a mass flow value in kg/h or Nm3/h. This principle works from pipe sizes DN15 up to DN1000. Insertion probes suit large ducts. Inline meters suit small lines and low flow rates. Most engineers prefer this approach because the meter output is already in mass units. You skip the external flow computer.
Key Advantages for Industrial Gas Measurement
EPI meters offer a wide turndown ratio, often 100:1. They measure very low flows, down to 0.01 Nm/s velocity. This matters in compressed air leak detection and flare gas monitoring. The meters introduce almost zero pressure drop. They handle dirty, wet gases like biogas from landfills or digester gas. A wastewater plant in Chile uses an EPI insertion meter to monitor biogas to its cogeneration engines. The meter works reliably despite high moisture and H2S traces.
Popular Models and Configurations
Eldridge Products offers several series. The 8000 series includes insertion and inline models. Many customers in the chemical sector choose the EPI 8000MP for multipoint applications over large ducts. For natural gas distribution, the EPI 9000 series with ATEX Zone 1 certification is common. Output signals include 4-20 mA HART and Modbus RTU. Silver Instruments can advise which model fits your application. We also help with spool piece fabrication when your pipe requires a welded connection.
Silver Instruments as Your EPI Flow Meter Supplier
Silver Automation Instruments is an authorized distributor of EPI flow m
Request a Quote from Silver Instruments
To get a fast quotation, send an email or message with the following data: gas type (or gas mix), flow range in kg/h or Nm3/h, pipe size DN, process pressure in bar, process temperature in °C. Contact Silver Instruments directly:
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
WeChat: +86 15365082610
Frequently Asked Questions
Q: What is the minimum gas flow an EPI meter can detect?
A: In ideal conditions, the insertion probe detects velocities as low as 0.01 Nm/s. For inline styles, the minimum flow depends on pipe size, but the meters excel at low flow measurement.
Q: Can the EPI meter handle gas composition changes?
A: Yes, but you must inform the factory about the gas mix. The meter is calibrated for a specific gas composition. Multi-gas calibration is possible on some models. Silver Instruments can clarify your options.
Q: Is the EPI flow meter suitable for high-temperature gas up to 200 °C?
A: Standard models work up to 120 °C. For temperatures up to 200 °C or higher, high-temperature probe versions are available. Please specify your temperature when you request a quote.
Q: What certifications are available for hazardous areas?
A: EPI offers ATEX, IECEx, and FM approvals for Zone 1 and Zone 2 areas. Most oil and gas clients in the Middle East order the ATEX certified 8000 series.
Q: How do I install an EPI insertion meter in an existing pipe?
A: You need a threaded or flanged mounting port. Silver Instruments provides detailed installation drawings and can supply the necessary compression fittings or valve assemblies for hot-tap installation.
For technical support or a quotation, contact Silver Automation Instruments. We help you pick the correct EPI flow meter model the first time.