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『Acid Flow Meter: Teflon lined electromagnetic and PFA processing sensors.』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
Acid Flow Meter: Teflon Lined Electromagnetic and PFA Processing Sensors
Quick Answer
Silver Instruments supplies acid flow meters with PTFE or PFA lined electromagnetic sensors. These meters measure sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, and mixed acid streams. Typical pipe sizes range from DN15 to DN300 and flow velocity from 0.1 m/s to 12 m/s. Send your acid type, concentration, pipe size, pressure, and temperature for a specific quote.
What Makes Acid Flow Measurement Different
Acid service attacks many flow meter materials. Stainless steel bodies fail quickly in hot hydrochloric acid. Rubber liners swell in nitric acid. But engineers often overlook the liner. A PTFE or PFA liner is not optional for most acid lines. It is the only practical barrier between the process acid and the flow sensor body.
We see this on customer sites in Southeast Asia and the Middle East. A buyer in Vietnam replaced three alloy flow meters in one year because the liner could not handle phosphoric acid at 70 degrees Celsius. The next meter used a PTFE liner and a tantalum electrode. That meter has been running for two years with no liner failure.
PTFE vs PFA Liners for Acid Flow Meters
PTFE and PFA are both Teflon class fluoropolymers. PTFE offers very high chemical resistance. It handles most acids including hydrofluoric acid up to moderate temperatures. PTFE liners work well from -40 degrees Celsius to 130 degrees Celsius in typical acid flow meters. PFA is a melt processable fluoropolymer. It is less porous than PTFE and gives a smoother liner surface. PFA liners reduce material build up in dirty acid streams.
For hot concentrated sulfuric acid, PFA is often better. It withstands vacuum and thermal cycling better than standard PTFE. For room temperature acid transfer, PTFE is a lower cost option. Both materials prevent acid contact with the meter body.
Electrode Materials Matter
The liner is not the only wet part. The electrodes also contact the acid. Silver Instruments offers several electrode options. Tantalum works for concentrated sulfuric acid and phosphoric acid. Platinum is preferred for hydrochloric acid and nitric acid. Hastelloy C suits weak acids and mixed chemicals. Titanium is only for dilute oxidizing acids at low temperature.
Many engineers select the right liner and forget the electrode. That causes early failure. We recommend you tell us the exact acid concentration and temperature. We will match both the liner and electrode.
Typical Applications
Our acid flow meters are used in chemical plants, fertilizer production, steel pickling lines, mining acid dosing, and wastewater pH control. For example a nickel mining site in Indonesia uses our DN50 PTFE lined electromagnetic flow meter with Hastelloy C electrodes for sulfuric acid dosing into leach tanks. The meter outputs 4-20 mA HART to a PLC. Flow range is 2 to 20 cubic meters per hour.
Another customer in Saudi Arabia measures hydrochloric acid at 25 percent concentration in a water treatment plant. The pipe size is DN80. The flow meter has PFA liner and platinum electrode
Technical Specifications
Standard specifications for our acid flow meters include accuracy of 0.5 percent of reading, repeatability of 0.1 percent, and conductivity minimum of 5 microsiemens per centimeter. Liner choices include PTFE, PFA, and FEP. Electrode options include tantalum, platinum, Hastelloy B, Hastelloy C, and titanium. Housing is IP67 or IP68. Outputs include 4-20 mA, pulse, RS485 Modbus, and HART. Power supply is 24 V DC or 220 V AC. Process connection can be wafer, flange, or sanitary type.
Pressure ratings go up to 40 bar for DN15 to DN100. For larger sizes, standard flanges follow PN10, PN16, ANSI 150, or ANSI 300. Temperature limits depend on liner. PTFE handles up to 130 degrees Celsius. PFA handles up to 180 degrees Celsius. FEP is limited to 120 degrees Celsius.
Installation Notes for Acid Service
Do not install a Teflon lined electromagnetic flow meter in a vacuum. Vacuum pulls the liner away from the pipe wall. If your process has vacuum, ask us about reinforced PFA liners. Use grounding rings when the pipe is non conductive. Plastic pipes need grounding rings. Our team can supply tantalum grounding rings for strong acids.
Keep the sensor full of liquid. Vertical installation with upward flow works best. In horizontal lines, place the electrodes in the 3 o clock and 9 o clock positions. This keeps the electrodes wet even when the pipe is partially full.
How to Get a Quote
To get a price for an acid flow meter from Silver Automation Instruments, send us the acid name, concentration, temperature, pipe size, pressure, and flow range. Also tell us the pipe material and whether the pipe is lined. We will reply with a model, liner type, electrode material, and price.
Call Silver Automation Instruments at +86-25-68650347. You can also use WhatsApp +86-25-52155837 or WeChat +86 15365082610.
FAQ
Can a PTFE lined electromagnetic flow meter measure hydrofluoric acid? Yes. PTFE and PFA liners resist hydrofluoric acid. Use platinum electrodes for best results. Tell us the acid temperature. Hot hydrofluoric acid needs special handling.
What is the minimum acid concentration for an electromagnetic flow meter? The acid must have a conductivity above 5 microsiemens per centimeter. Most process acids meet this. Pure water with acid traces may not. We can check your fluid properties.
What pipe sizes are available? Standard sizes go from DN10 to DN600. For very small acid dosing lines, we offer DN6 sensors. Large acid transfer lines can go up to DN1200 on request.
Do I need grounding rings? If the pipe is metal and unlined, grounding rings are often not needed. If the pipe is plastic or lined, grounding rings are required. We can supply titanium, tantalum, or Hastelloy grounding rings for acid service.
How long is delivery for an acid flow meter? Standard DN15 to DN100 PTFE lined meters ship in 7 to 10 days. Larger sizes and special electrodes take 15 to 20 days. Send your project schedule and we will confirm.