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4 Flow Meter: Specifications for Four-Inch Diameter Industrial Fluid Sensors
Quick Answer: A four-inch flow meter (DN100) typically covers flow ranges between 15 and 550 m³/h for liquids, depending on the technology you choose. Electromagnetic and vortex meters are the most practical options for this line size in water, chemicals, steam, and light hydrocarbons. Always confirm the liner, electrode material, pressure rating, and process temperature before you send an inquiry.
Process engineers often reach a point where 2-inch instruments choke the flow and 6-inch units blow the budget. The DN100, or four-inch, sensor lands right in the sweet spot for mid-capacity transfer lines, cooling water headers, and chemical batching. At Silver Automation Instruments we stock and configure four-inch meters across four different technologies because one size never fits all fluids.
Electromagnetic Flow Meters for 4-Inch Pipes
An electromagnetic flow meter (magmeter) is the go-to for conductive liquids in DN100 lines. Our SEMAG series in four-inch size handles flow from 19 to 566 m³/h with an accuracy of 0.5 percent of reading. Standard liner options are PTFE for chemical resistance and hard rubber for raw water or slurry. Electrode choices include 316L, Hastelloy C, and platinum, which lets you match the meter to the specific conductivity of your fluid, from deionized water above 5 µS/cm to aggressive acids.
We recently supplied a SEMAG DN100 with a PTFE liner and Hastelloy C electrodes to a paint manufacturer in Indonesia. Their challenge was a latex emulsion with a viscosity around 800 cP at 30 °C. The magmeter provided stable readings without the pressure drop issues that had killed their previous orifice plate setup. Output was standard 4 to 20 mA HART and Modbus RTU, feeding directly into their DCS.
For hazardous areas, the SEMAG series can be ordered with ATEX Zone 1 or IECEx certification. Ingress protection goes up to IP68 for continuously submerged installation, and the meter body comes in both compact and remote-mounted versions. This matters a lot when the four-inch line runs in a buried trench at a wastewater plant.
Vortex Flow Meters at Four Inches
When your four-inch line carries steam, compressed air, or low-conductivity fluids, a vortex meter often beats magmeters and mass meters on cost. Silver Instruments SVF vortex flow meter in DN100 covers steam flow from about 0.6 to 12 tonnes per hour at typical process pressures. It directly measures volume flow with a blunt body shedder bar and a piezoelectric sensor, giving you a frequency output proportional to velocity.
One thing engineers commonly miss is the minimum Reynolds number. For a four-inch vortex meter, you need Re above 20,000 to keep the linear range. If your fluid is heavy oil or operates at very low velocity, the vortex street collapses and the meter under-reads. We usually specify a DN100 vortex meter for saturated steam at 10 barg and 180 °C or above because the velocity stays in the reliable zone.
The SVF meter outputs 4 to 20 mA, pulse, and RS-485. Integrated temperature and pressure compensation is available so you can display mass flow for steam directly on the local indicator. This is a key spec for a food-grade steam line where you need accurate totalized mass for production records.
Coriolis Mass Flow Meters in DN100
A four-inch Coriolis meter is a premium choice but sometimes the only right one. The Silver Instruments SCF series DN100 measures mass flow, density, and temperature in one device. Maximum flow rate is around 400 tonnes per hour for water-like liquids. Accuracy reaches 0.1 percent of rate for liquids and 0.35 percent for gases. If you dispense crude palm oil, fuel oil, or molasses by weight, a DN100 Coriolis eliminates the need for separate density conversion.
Here is the thing. A Coriolis meter of this size is heavy, roughly 160 kg for the wetted body alone, and requires proper pipe supports. We have seen installations
Ultrasonic Clamp-On Meters for Fast Trials
Clamp-on ultrasonic flow meters work on four-inch steel or plastic pipes when you cannot shut down the process. Our SUF series strap-on transducers mount externally and measure flow through the pipe wall. Accuracy in the 1 to 2 percent range is typical for a clean, fully filled DN100 pipe with straight run of 10D upstream. This is more of a survey tool than a permanent meter, but we often see water utility contractors in the Philippines using a DN100 clamp-on to verify pump performance without cutting into the line.
Key Specifications to Specify Before You Quote
When you request a price for a four-inch flow meter, we need more than just pipe size. Fluid name, conductivity (if magnetic), viscosity (if positive displacement or Coriolis), operating temperature, and pressure class dictate the design. Standard flange ratings are ANSI 150, PN16, or PN40. For a DN100 meter in a thermal oil loop at 300 degrees Celsius, we will move you away from a standard magmeter to a vortex meter with high-temperature electronics or a Coriolis with HT electronics.
Process connection is another detail. Most four-inch industrial meters ship with raised face flanges, but tri-clamp sanitary fittings are standard for food and dairy. In Sydney, a brewery customer ordered a DN100 electromagnetic flow meter with DIN 11864-2 aseptic flanges from us for their yeast propagation line. That small change in the spec avoided a separate adapter spool and saved them two days of installation work.
Accuracy requirements dictate whether you pay for a basic 0.5 percent meter or a custody transfer 0.2 percent system. For water treatment plants dosing ferric chloride, 0.5 percent is plenty. For a bunker fuel transfer in Singapore, that extra precision on a four-inch Coriolis pays for itself in a few months of reduced giveaway.
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Our engineers reply with a specific model and a data sheet the same business day. Reach Silver Automation Instruments at [email protected], call +86-135-1213-1526, or message us on WhatsApp at 86-135-12131526. You can also find detailed four-inch flow meter specs and dimension drawings on flow-meter.com.au.
Frequently Asked Questions
What is the typical flow range of a 4-inch electromagnetic flow meter? For water with a velocity between 0.3 and 10 m/s, a DN100 magmeter covers approximately 19 to 566 m³/h. The exact range depends on the liner ID and the converter settings.
Can a 4-inch vortex flow meter measure low-pressure steam? Yes, but you need to check the minimum flow velocity. A four-inch vortex meter works reliably on steam above 3 m/s. Below that, the signal drops below the meter cutoff and the output goes to zero.
Which liner material works best in a 4-inch magnetic flow meter for seawater? Hard rubber or EPDM is fine for ambient seawater. If the seawater is deaerated or above 40 degrees Celsius, we recommend PTFE with Hastelloy C electrodes to prevent liner deformation and pitting.
Is a four-inch Coriolis meter justified for viscous oils? If you need mass measurement without density correction, yes. A DN100 Coriolis handles lubricating oils up to 10,000 cP. You skip the temperature compensation charts and get direct mass flow that helps with inventory reconciliation.
What straight pipe run does a four-inch flow meter need? For a magmeter, 5D upstream and 2D downstream is standard. A vortex meter usually needs 15D upstream and 5D downstream. Clamp-on ultrasonic meters work best with 10D upstream. Always mention your available straight run when you request a quote.
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