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8705 Magnetic Flow Meter: Rosemount Flanged Electromagnetic Sensor Specs
Quick Answer
The Rosemount 8705 is a flanged magnetic flow meter sensor rated for line sizes from DN15 to DN900. It handles process temperatures up to 180 °C with a PTFE or PFA liner and works with fluids that have a minimum conductivity of 5 µS/cm. Silver Automation Instruments supplies a direct‑form‑fit flanged magmeter alternative with similar liners, Hastelloy electrodes, 0.2 % accuracy and four‑week delivery to Australia, Vietnam, Saudi Arabia and Mexico.
What the 8705 Flanged Sensor Actually Delivers
The 8705 sensor body is built from carbon steel or 304 stainless steel. Its flanged connection matches EN 1092‑1 or ASME B16.5. Standard bore diameters run from 15 mm up to 900 mm. Engineers in water treatment and mining often pick the 8705 because the liner choices are wide: hard rubber for raw water, PTFE for aggressive chemicals, PFA for high‑temperature CIP, and polyurethane for abrasive slurries.
Electrode materials land in four camps. 316L works for clean water and weak acids. Hastelloy C‑276 fits seawater and chlorides. Titanium targets brine and brackish water. Tantalum is kept for sulphuric and hydrochloric acid. We have seen a paint manufacturer in Vietnam swap out a carbon steel meter for an 8705 with Hastelloy C electrodes just to handle a titanium dioxide slurry. The original meter failed in three months.
Process temperature limits depend on the liner. With PTFE you can push to 180 °C. PFA maxes at 180 °C as well. Polyurethane stays safe up to 60 °C. Hard rubber stops at 80 °C. Pressure ratings climb to PN40 or Class 300. Most customer sites run between 10 bar and 25 bar, so the headroom is there. Accuracy sits at 0.15 % of rate when calibrated with a matched transmitter. Field repeatability is a solid 0.1 %.
Outputs and Installation Reality
The 8705 pairs with a Rosemount 8712 or 8732 transmitter. The combo gives you 4‑20 mA with HART, a scalable pulse output, and a digital display with three totalizers. The sensor alone carries an IP67 enclosure. The entire assembly meets NEMA 4X. In practice, most engineers skip the junction box and order a pre‑cabled EX‑approved set for ATEX Zone 1 or IECEx. This cuts field wiring time by half a day on a DN200 line.
Grounding rings are a must unless you use a built‑in grounding electrode. On lined steel pipes, a carbon steel grounding ring is enough. For plastic or concrete pipes in a desalination plant in Oman, we have seen contractors use titanium grounding rings to keep the 4‑20 mA loop steady. Silver Automation Instruments includes a matching set of grounding rings in the quote by default. You do not ask for it.
Silver Instruments Flanged Electromagnetic Flow Meter: Specs That Match
Our flanged magmeter line covers DN6 through DN2000. Liners ar
Here is the thing. The Rosemount 8705 is a fine instrument, but when a distributor in Jakarta needs three flanged meters for a palm oil steam condensate line, the eight‑week lead time becomes a problem. We ship from stock or within two to four weeks. A project engineer in Ghana recently ordered a DN150 PTFE‑lined meter with Hastelloy C electrodes on a Wednesday afternoon. The unit left our Nanjing factory on Friday. It was online the following week. That is the difference.
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. Our engineers will match the exact liner and electrode to your fluid. You can reach Silver Automation Instruments directly. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. Or leave a spec sheet at flow‑meter.com.au.
FAQ
What is the minimum conductivity for the Rosemount 8705?
The 8705 sensor needs at least 5 µS/cm. Demineralized water usually falls below that, so you would need a capacitance‑based meter. Silver magnetic flow meters also require 5 µS/cm minimum. We always ask for a conductivity value before quoting.
Can I use the 8705 for hot chocolate syrup in a food plant?
Yes, with a PFA liner and 316L electrodes. PFA handles CIP cycles at 130 °C without deforming. Many food factories spec the 8705 for this. Silver offers the same liner and FDA‑compliant materials for dairy and confectionery lines.
Does the Silver flanged meter work as a drop‑in replacement for the 8705?
Mechanically, yes. We build to the same face‑to‑face lengths per ISO 13359. The flange drilling matches DIN PN16 or ANSI 150. The 4‑20 mA HART signal is identical. Most of our customers in Mexico just swap the sensor and keep the existing wiring.
What about pressure drop across the 8705?
A full‑bore electromagnetic sensor like the 8705 has zero additional pressure drop. It is just a straight pipe. Our magmeter also has no moving parts and no restriction. This matters when you pump high‑viscosity starch slurry and every bar counts.
How do I get a quote fast for a flanged electromagnetic flow meter?
WhatsApp us at +86-25-52155837 with your pipe size, fluid name, temperature, pressure and liner preference. You will have a priced datasheet in two hours. For larger tenders in Southeast Asia or the Gulf, our team provides full technical compliance sheets. No generic contact forms.