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Rosemount 8705 Flow Meter Flanged Heavy Industrial Electromagnetic Sensors
Quick Answer: The Rosemount 8705 is a flanged electromagnetic flow sensor for heavy industrial lines. It measures conductive liquids with no moving parts and works in water, wastewater, chemicals, and slurry systems. Silver Automation Instruments can supply a compatible flanged magmeter from DN15 to DN900 with PTFE or PFA liners and 316L, Hastelloy, or tantalum electrodes.
This article explains the key specifications, typical applications, liner selection, and pricing for this class of sensor. We focus on real field data from projects in Southeast Asia, Middle East, Latin America, and Oceania. You will also find a short FAQ at the end for quick reference.
What Is the Rosemount 8705 Electromagnetic Sensor
The 8705 sensor uses Faraday law of electromagnetic induction to measure liquid velocity. A magnetic field is generated inside the flow tube. Conductive liquid passes through the field and produces a voltage. This voltage is proportional to flow rate. The flanged body suits heavy pipe systems, high vibration areas, and aggressive process lines.
Most users pair the sensor with an 8712 or 8732 transmitter. The transmitter converts the voltage signal into a 4 to 20 mA HART output. Some plants also use pulse or digital outputs for PLC integration.
Key Specifications That Matter for Heavy Industry
Line sizes for flanged sensors in this class go from DN15 to DN900. Pressure ratings depend on flange standard. Small and mid sizes often handle 40 bar. Larger sizes may be limited to 16 bar or 10 bar. Temperature range depends on the liner. A PTFE liner works from minus 29 degrees C to 180 degrees C. PFA liners have a similar range. Hard rubber liners are limited to 80 degrees C and suit water and wastewater.
Electrode options include 316L stainless steel, Hastelloy C, tantalum, and platinum. Accuracy is usually plus or minus 0.5 percent of reading when the sensor is paired with a compatible transmitter. Minimum liquid conductivity is 5 microsiemens per cm for a stable signal. Fluids below this value will not work.
Typical Applications Where the 8705 Sensor Fits
This sensor class covers many heavy industrial fluids. We have seen similar flanged magmeters on sludge transfer lines in a wastewater plant in Vietnam. A mining operation in Chile measured slurry with solids up to 30 percent by weight. A desalination plant in Saudi Arabia used flanged electromagnetic meters on brine discharge. Cooling water systems in Thailand often select this type of meter because of low maintenance and bidirectional flow capability.
The sensor does not work for hydrocarbons, gases, or pure water with very low conductivity. The liquid must be conductive and must fill the pipe completely. Partially full pipes cause measurement errors unless the site uses special software or a level sensor.
Rosemount 8705 vs Silver Instruments Flanged Magmeters
The Rosemount 8705 is a proven sensor. But it is not the only option for a flanged electromagnetic flow meter in heavy industrial service. Silver Automation Instruments manufactures flanged magmeters with similar liner and electrode choices. We often quote for DN50 to DN600 water lines, acid transfer, and mining slurry. Our lead time is short because we build to order in our factory. Price is lower for distributors and EPC buyers in Middle East, Southeast Asia, and Latin America.
You can send us your pipe size, pressure, temperature, flow range, and conductivity. We
Liner and Electrode Selection Guide
Do not guess on liner choice. For clean water and wastewater, use a hard rubber liner and 316L electrodes. For acids and caustic, use a PTFE or PFA liner with Hastelloy C electrodes. For seawater and brine, use a PTFE liner with titanium or tantalum electrodes. For food and beverage, use a PFA liner with 316L and a sanitary flange connection.
Send us the chemical concentration and temperature. We check compatibility before quoting. This step prevents liner swelling or electrode corrosion in aggressive fluids. A paint manufacturer in Southeast Asia sent us a solvent mixture last year. We found that a standard liner was not compatible and quoted a PFA liner with Hastelloy electrodes instead. That meter is still running without issues.
Installation and Mounting Notes
The sensor needs straight pipe upstream and downstream. For most installations, use 5 pipe diameters upstream and 2 pipe diameters downstream. A DN100 line needs 500 mm of straight pipe before the meter. Ground the sensor to the process pipe. Use the correct gasket diameter so the liner is not damaged. Do not install the sensor at the highest point in a line with air bubbles or entrained gas.
For heavy industrial lines, use a flanged sensor, not a wafer type. Flanged sensors handle vibration and high pressure better. In practice, most engineers skip wafer meters on aggressive or high flow lines because the flange bolts carry a higher load.
How to Get a Quote for a Flanged Electromagnetic Flow Meter
Send us your pressure in bar, temperature in degrees C, pipe size in DN, and flow range in cubic meters per hour. Also mention the fluid, conductivity, and any solids content. Our sales team will recommend a model from Silver Instruments and send a quotation within 24 hours.
Contact us directly at Tel +86-135-1213-1526, Whatsapp 86-135-12131526, or WeChat +86 13512131526. You can also visit flow-meter.com.au for more technical data.
FAQ
What is the minimum conductivity for the Rosemount 8705?
The liquid needs at least 5 microsiemens per cm for stable readings. Most water, acids, bases, and slurries exceed this. Oils and gases will not work.
Can this sensor measure flow in both directions?
Yes. The sensor measures flow in both directions when the transmitter is set for bidirectional flow. Many cooling water systems use this feature.
What is the maximum line size?
The 8705 series and similar flanged electromagnetic sensors commonly go up to DN900 for standard models. Larger sizes can be quoted case by case.
What maintenance does this sensor need?
There are no moving parts. You need to keep the liner clean and inspect electrodes every 6 to 12 months in aggressive service. Do not use a high pressure washer directly on the liner.
Is the 8705 available with ATEX or IECEx approvals?
Yes. Hazardous area versions can be ordered. Flanged sensors for Zone 1 and Zone 2 areas are common in chemical plants. You must specify the gas group and temperature class when ordering.
For a fast quote, send your process parameters to Silver Automation Instruments. We supply flanged electromagnetic flow meters for heavy industrial service in Southeast Asia, Oceania, Middle East, Africa, and Latin America. Tel +86-135-1213-1526, Whatsapp 86-135-12131526, WeChat +86 13512131526.
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