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Sanitary Magnetic Flow Meter: Clean-In-Place Food and Dairy Fluid Probes
Quick Answer: Sanitary magnetic flow meters from Silver Automation Instruments measure conductive liquids in food and dairy processes with zero moving parts. They handle milk, cream, yogurt, fruit pulps, and CIP cleaning chemicals without trapping product. All wetted materials meet FDA and 3-A standards. Send your flow range, pipe size (DN), and product viscosity for a same-day quotation.
Why a Magnetic Flow Meter Fits Food and Dairy Lines
Electromagnetic flow meters work on Faradays law. The meter generates a magnetic field. The conductive liquid passing through it induces a voltage. That voltage is exactly proportional to velocity. No moving parts contact the product. So there is nothing to clog with cream or pulp. Accuracy stays within ±0.2% of reading for most sizes from DN10 up to DN300. This matters when you dose precise amounts of liquid sugar into a batch mixer or measure raw milk intake at a dairy receiving station.
Silver Instruments builds these probes with 316L stainless steel electrodes and a PFA or PTFE liner. The liner is seamless. It does not peel or trap particles. We have supplied flow meters to a dairy processor in Thailand measuring whey concentrate at 80 °C. Another chocolate factory in Brazil uses our DN50 sanitary mag meter on tempered chocolate before molding. The meter handles 15 000 kg/h without pressure loss.
CIP-Ready Design Without Dead Zones
Sanitary process lines demand Clean-In-Place cycles. Hot caustic (NaOH) and acidic solutions circulate at 85 °C to 95 °C and up to 2 bar. A flow meter must survive these conditions daily. Our sanitary magnetic flow meter uses a full-bore straight tube. There are no crevices, no narrow gaps, and no O-rings exposed to the product. The surface finish is Ra ≤ 0.8 µm. This prevents bacterial attachment.
The standard process connection is tri-clamp (Tri-Clover) from 1/2 inch to 4 inch. We also offer DIN 11851 dairy fittings and SMS unions. During CIP, the flow meter can remain in line. No disassembly required. The PTFE or PFA liner withstands thermal shock well. The meter electronics are in a sealed IP67 or IP68 housing. You can wash it down daily with low-pressure hoses.
We often see plant engineers ask about the temperature offset. At Silver Instruments, we calibrate each sensor with a PT100 temperature compensation loop. The transmitter adjusts for conductivity shifts when product temperature changes from 4 °C to 120 °C. This keeps your brix or CIP flow reading stable.
Applications from Raw Milk to Final Packaging
The meter works across the whole dairy and beverage chain.
- Raw milk receiving at 2 000 to 50 000 litres per hour.
- Pasteurizer flow control: meter sends 4-20 mA HART signal to the PLC to regulate steam injection.
- CIP return line monitoring: detect low flow or blocked spray balls.
- Filling machine supply: batch filling of flavoured milk with ±0.5% dose accuracy.
- Fruit pulp and concentrate transfer: orange pulp with 10% fibre, mango puree at 25 Brix.
We have customers in the Middle Eas
Key Specifications You Need for Sizing
When you send an inquiry, have these numbers ready. It saves time.
Pipe diameter: DN15 to DN300 (larger on request).
Liner material: PFA standard, PTFE for high-temperature steam.
Electrode material: 316L standard, Hastelloy C for acidic products.
Process connection: Tri-clamp, DIN 11851, SMS, or flange.
Temperature range: -20 °C to 150 °C with integral or remote electronics.
Outputs: 4-20 mA HART, pulse, RS485 Modbus RTU.
Power: 220 V AC or 24 V DC.
Accuracy: ±0.2% for DN40 and larger.
Certification: 3-A, FDA, EHEDG, and ATEX Zone 1 optional.
An engineer at a cheese plant in Australia recently ordered a remote-mount version. Their ambient temperature near the pasteurizer was over 70 °C. So we supplied a 10-metre cable between sensor and transmitter. Works without drift.
Frequently Asked Questions
Q: Can the meter handle dairy products with air bubbles or froth?
A: Magnetic flow meters demand a full pipe. Large air slugs cause reading errors. We recommend installing an air eliminator upstream. For yogurt with entrapped air, a small back-pressure valve often solves the issue.
Q: Is the meter suitable for sugar syrup with 70 Brix at low flow?
A: Yes, as long as conductivity is above 5 µS/cm. Most syrups exceed that. We have installed a DN25 meter on a glucose syrup line. Minimum flow was 20 litres per hour and the meter still held ±0.5% accuracy. Tell us your lowest and highest flow. We check the velocity.
Q: Do you provide 3.1 material certificates?
A: Yes. We can supply EN 10204 3.1 certificates for wetted parts and full calibration certificates traceable to ISO 17025. Mention this when you request a quotation.
Q: How often does the meter need recalibration?
A: With no moving parts, the meter drifts very little. Most food plants check calibration once per year. Our transmitter has a built-in verification tool that checks coil and electrode integrity in five minutes. No external device needed.
Q: Can you integrate the meter into a Profibus network?
A: Standard output is 4-20 mA HART and Modbus RTU. Profibus PA is possible via a third-party converter. However, most customers now use Modbus RTU because it is simple and does not require a DP/PA coupler. Ask our team if you need advice on the architecture.
Get a Quotation for Your Sanitary Magnetic Flow Meter
Send your process details: product name, flow rate (l/h or m³/h), pipe size (DN), temperature, pressure, and required certification. We respond within 12 hours. Our contacts:
Email: [email protected]
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
WeChat: +86 15365082610
Silver Automation Instruments supplies magnetic flow meters, Coriolis mass flow meters, and ultrasonic flow meters to 90 countries. Visit flow-meter.com.au for more references.