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Rosemount Flow Meter 8705 Inline Conductive Liquid Induction Spools
Quick Answer
The Rosemount 8705 is a flanged inline electromagnetic flow sensor for conductive liquids. It works as a spool piece between pipe flanges and needs a separate transmitter. We supply compatible replacement spools from DN15 to DN900 with PTFE, PFA, and rubber liners.
What the 8705 Spool Actually Does
This sensor is not a complete flow meter. The 8705 is an inline conductive liquid induction spool with two coils and two electrodes. Conductive liquid passes through a magnetic field. The electrodes pick up a small voltage proportional to velocity. A Rosemount 8712 or 8732 transmitter converts that signal to 4-20 mA HART, pulse, or fieldbus output. In practice many plant engineers treat the 8705 as a flange spool and keep spare transmitters in stock.
We have seen water treatment plants in Singapore and chemical plants in the Philippines use this split architecture. The spool itself rarely fails unless the liner cracks or the electrodes get coated. The most common failure comes from hydraulic shock, high temperature, or wrong liner selection.
Key Parameters We Ask For
We need seven data points before quoting a Rosemount 8705 replacement spool. Pipe size in DN. Liner material. Electrode material. Pressure rating in bar. Process temperature in degrees Celsius. Minimum liquid conductivity in microsiemens per centimeter. Flow range in cubic meters per hour.
For most water and wastewater lines we recommend a hard rubber or PTFE liner with 316L stainless steel electrodes. The conductivity should be at least 5 µS/cm for a short cable run. Use 20 µS/cm as a safer minimum for long runs or mixed streams. For a seawater intake in a desalination plant we specify titanium electrodes and a polyurethane liner. For aggressive acids we move to PFA and Hastelloy C-276.
Here is the thing. Many engineers focus on pressure and forget liner temperature. PTFE works from -40 °C to 160 °C. PFA handles strong oxidizers but costs more. Natural rubber is good for slurry and seawater but fails above 65 °C in continuous service. We check this before you pay.
Where the 8705 Spool Is Common
In Australia we send many replacement spools to municipal water and mining sites. A Western Australia iron ore operation replaced three DN200 Rosemount 8705 spools because the original PTFE liners cracked after slurry service. In Indonesia we quoted a DN150 unit for a palm oil wastewater line. In Vietnam a paint manufacturer needed a DN50 spool for solvent based coatings. We supplied a PFA lined sensor with Hastelloy C electrodes to handle the chemical mix.
In the Middle East the 8705 often appears in produced water and fire water systems. In Latin America we see it in sugar processing and fruit juice lines. The flanged spool design fits high pressure ANSI 150 and ANSI 300 lines without special reducers. This is why the 8705 remains popular in oil and gas skids from Monterrey to Dammam.
Silver Instruments Replacement Spools
We build flanged electromagnetic flow sensor spools that match the face to face length of many Rosemount 8705 sizes. Standard line sizes run from DN15 to DN900. Larger sizes are available on request. We offer PTFE, PFA, polyurethane, natural rubber, and neoprene liners. Electrode choices include 316L stainless steel, Hastelloy C-276, titanium,
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Accuracy is 0.5 percent of reading under reference conditions. Repeatability is 0.1 percent. Protection options include IP66, IP67, and IP68 for flooded pits. We can supply ATEX Zone 1 versions for gas and chemical plants. The spool can ship with a Silver Instruments transmitter that gives you 4-20 mA HART, pulse output, and RS485 Modbus. This avoids long OEM lead times. We also match nonstandard flange standards like AS2129 Table E for Australia and JIS 10K for Indonesia.
Price and Delivery Reality
The price of an 8705 compatible spool depends on four things. Diameter is the biggest driver. Liner and electrode materials come second. Pressure rating and approvals add cost. A DN50 PTFE lined spool with 316L electrode starts around 580 USD ex works. A DN300 rubber lined seawater unit with titanium electrodes usually lands between 2,300 and 2,600 USD. Custom PFA and Hastelloy C versions cost more.
Standard spools leave our facility in 5 to 10 days. Special liners take 15 to 20 days. Air freight to Singapore, Perth, or Dubai takes 3 to 5 days. Sea freight is cheaper for large DN300 and larger units but adds 15 to 30 days. Last year a customer in Saudi Arabia avoided a 16 week OEM wait by accepting our DN150 PFA spool in 12 days. That single order kept a fire water pump package on schedule.
How to Send a Quote Request
Send us the following details in your first message. Pipe size in DN. Pressure in bar. Temperature in Celsius. Flow range in m3/h. Liquid name or conductivity in µS/cm. Liner preference if known. Electrode material if known. We will reply with price, lead time, and a data sheet. You can reach us by phone at +86-135-1213-1526. WhatsApp is 86-135-12131526. WeChat is +86 13512131526. Our site is flow-meter.com.au.
Do not send a PDF of a nameplate alone. It helps but it is not enough. A short list with the seven data points works faster. We quote standard spools within one business day.
FAQ
Can the 8705 induction spool measure clean water?
Yes. Clean drinking water usually has conductivity from 50 to 800 µS/cm. That is above the 5 µS/cm minimum for most models. If the water is ultra pure below 1 µS/cm you need a different technology such as a Coriolis mass flow meter.
What liner should I choose for sodium hypochlorite?
Use PFA or PTFE for sodium hypochlorite. Avoid natural rubber. Check the chemical compatibility at your process temperature before ordering. We can confirm the liner choice with our technical team.
Do you offer ATEX spools for gas terminals?
Yes. We supply ATEX Zone 1 and Zone 2 rated electromagnetic flow sensors for flammable liquid and gas terminal skids. We need the hazardous area classification, gas group, and temperature class before quoting.
What is the delivery time to Australia?
Standard spools ship to Perth, Brisbane, and Melbourne in 8 to 14 days including air freight. Custom liners add 10 to 15 days. For urgent replacements we can sometimes split an order and air ship one spool while the rest goes by sea.
Can I use the 8705 spool with a Silver Instruments transmitter?
Yes. We supply matching transmitters with local display, 4-20 mA HART, pulse, and RS485 Modbus. For best accuracy we recommend calibrating the spool and transmitter as a matched set in our flow rig before shipment.