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Erdco Flow Meter Catalog: See-Through and Armor-Tough Variable Area Meters for Industry
Quick Answer: Erdco variable area flow meters give two practical choices for process lines. See through meters offer direct float reading for water, air, and mild chemicals. Armor tough meters handle higher pressure, higher temperature, and rough field conditions. Silver Automation Instruments supplies Erdco type variable area meters plus equivalent industrial rotameters for projects in Southeast Asia, Oceania, Latin America, the Middle East, and Africa.
What the Erdco Catalog Covers for Industrial Flow Measurement
The catalog covers two main body styles. See through variable area meters use a clear polymer tube with direct reading scales. Operators check flow without opening a bypass or checking a remote display. Armor tough variable area meters use a metal body with a magnetic float, direct scale, or optional transmitter.
Common sizes start at DN10 and go up to DN80. NPT and BSP threads are standard on smaller bodies. Flanged connections are available from DN25 upward. For water, small meters cover 0.02 to 2.0 GPM. Larger industrial meters cover up to 150 GPM. Air and gas ranges start around 0.1 SCFM and reach 500 SCFM.
Accuracy is usually plus or minus 2 percent of full scale. Repeatability is plus or minus 0.5 percent. Turndown is typically 10 to 1. These numbers suit local indication and basic process control, not custody transfer.
Key Specifications Engineers Check Before Quoting
Field engineers check the body material first. Armor tough bodies in 316 stainless steel handle corrosive plant air and water. For cooling water with chloride, 316 SS is common. For strong acids, PTFE lined bodies or all polymer wetted parts are safer.
Temperature and pressure decide the model. Many see through polymer tubes run at 10 bar and 90 °C maximum. Metal body variable area meters can handle 16 bar at 120 °C or higher if specified. For steam or hot condensate, a metal body with a magnetic float and 4-20 mA HART output is more reliable than a clear tube.
In practice, most engineers skip the see through option when the line pressure goes above 10 bar or the fluid temperature exceeds 70 °C. Viscosity also matters. When viscosity goes above 10 cP, the float may not track the same calibration curve. In that case, an oval gear flow meter is often a better fit for fuel, oil, and high viscosity chemicals.
Output options include local indication only, two wire 4-20 mA, alarm switches, and HART communication. For hazardous area installation, a loop powered 4-20 mA HART transmitter with ATEX Zone 1 rating is available on metal body meters. Purely mechanical see through meters need no power and can be used where a local operator is present.
Where Armor Tough and See Through Meters Fit in the Field
See through meters work well for ambient water, air, sodium hypochlorite at low concentration, and non opaque liquids in wash skids, cooling towers, and pilot plants. Plants in Thailand and Vietnam often use them on reverse osmosis feed lines and filter backwash lines. The operator checks the float position during a walk down. No power or transmitter is needed.
Armor tough meters are more common in the Middle East and coastal Latin America. High ambient temperature, UV exposure, and rough handling make clear polymer tubes less attractive. For a desalination plant in Saudi Arabia, the project team asked for armored variable area meters on antiscalant dosing and cleaning chemical l
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In the food and beverage sector, a customer in Australia used armored variable area meters on a clean in place skid. The fluid was hot caustic. The meters were specified with 316 SS bodies, PTFE wetted parts, and alarm switches. The clear tube option was not acceptable for hot caustic at 85 °C.
We have seen this failure on customer sites many times. A clear tube meter may look good on a datasheet but the tube can craze after one year in strong sunlight.
How Silver Automation Instruments Supplies Erdco Type Meters
Silver Automation Instruments is a process instrument supplier based in China with customers in more than 40 countries. We supply Erdco type variable area flow meters, industrial rotameters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, Coriolis mass flow meters, and thermal mass flow meters.
We help you choose between a see through meter and an armor tough meter based on fluid, pressure, temperature, pipe size, and local site conditions. If the original Erdco meter is obsolete or lead time is too long, we offer equivalent industrial rotameters with the same process connection and flow range.
For most standard variable area meters, we keep common DN15 and DN25 sizes in stock. Flanged DN50 and DN80 meters are assembled to order. Typical lead time is 10 to 15 days. Calibration certificates and test reports are available.
Get a Quote Without Back and Forth
Send us this data: fluid name, pipe size in DN or inch, flow range in L/h GPM or m³/h, pressure in bar, temperature in °C, connection type, and output signal. If you have an existing Erdco model number, send that as well. We will return a proposal with a datasheet and price.
Silver Automation Instruments
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
FAQ
Can a see through Erdco type meter handle hot water?
The answer depends on the tube and end fitting material. Many polymer tubes handle 90 °C at 10 bar maximum. For water above 90 °C or pressure above 10 bar, choose a metal body armored meter.
What is the typical flow range for a DN25 variable area meter?
For water, a DN25 meter can cover 0.2 to 3 m³/h depending on the float and tube design. For air, the range is usually higher. Send us your normal and maximum flow. We will select the right meter.
Can Silver Instruments supply a 4-20 mA output with local indication?
Yes. Many armored variable area meters are available with two wire 4-20 mA output, HART, and alarm switches. We also supply paperless recorders for flow total and alarm logging.
Are these meters suitable for seawater desalination plants?
Yes, if you specify the correct materials. For seawater and brine lines, use an armored flow meter with 316 SS or duplex body and PTFE or ceramic internals. For dosing lines with antiscalant or sodium hypochlorite, PTFE wetted parts are common.
What is the lead time for Erdco type variable area meters?
Common DN15 and DN25 meters are often in stock. Flanged or special material meters usually ship in 10 to 15 days. Large project quantities may take longer. We confirm the date with your order.
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