Rosemount 8705 Flanged Flowtube Sensor Flanged flowtube sensors for conductive liquids and slurries
Quick Detail:
- Manufactured by Rosemount
- Flanged style
- 0.25% standard accuracy; 0.15% high accuracy option available
- ½ to 36 inch size available
- Pulsed DC coil drive power
- Standard process design
Description:
Rosemount 8705 flanged flowtube sensors are fabricated from stainless and carbon steel and welded to provide a hermetic seal that protects against moisture and other contaminants.
The Rosemount 8705 is available in sizes ranging from ½ to 36 inches. The sealed housing pn the Rosemount 8705 flanged flowtube ensures maximum flowtube sensor reliability by protecting all internal components and wiring from the most hostile environments.
Rosemount magmeter systems use pulsed DC technology that provides continuous automatic zeroing to compensate for variations in the process environment. Process liquid must have a conductivity of 5 microsiemens/cm (5 micromhos/cm) or greater.
Rosemount 8705 flowtubes are interchangeable with both the 8712D and 8732 flow transmitters. System accuracy is maintained regardless of line size or optional features. Each Rosemount 8705 flanged flowtube nameplate has a sixteen-digit calibration number that can be entered into a transmitter through the Local Operator interface or the HART Communicator - depending on model.
Applications:
The Rosemount 8705 flanged sensors are fabricated from stainless and carbon steel and welded to provide a hermetic seal that protects against moisture and other contaminants. The sealed housing ensures maximum sensor reliability by protecting all internal components and wiring from the most hostile environments. All Rosemount magmeter systems use pulsed DC technology that provides continuous automatic zeroing to compensate for variations in the process environment.
Specifications:
| Key Specifications |
| Flowmeter Accuracy |
± 0.65 % of rate for liquids (±1.00% for line size 6-in (150 mm) and greater)
± 1% of rate for gas and steam (±1.50% for line size 6-in (150 mm) and greater) |
| Turndown |
38:1 |
| Output |
- 4-20 mA with HART®
- 4-20 mA with HART® and Scalable Pulse Output
- FOUNDATION™ fieldbus with 2 Analog Input blocks, 1 Backup Link Active Scheduler function block, and 1 Integrator function block (1 PID function block optional)
|
| Wetted Material |
Stainless Steel - 316/316L and CF3M
Nickel Alloy - C-22 and CW2M
Consult factory for other wetted material options |
| Flange Options |
ANSI Class 150 to 900
DIN PN 10 to PN 160
JIS 10K to 40K
Flanges are available in a variety of facings |
| Operating Temperatures |
-330°F to 800°F (-200°C to 427°C) |
| Line Size |
Flanged - 1-in to 12-in (25 to 300 mm) |
|
Step 1: Flow Sensor Type
| |
Type |
Application Notes |
Accuracy Option |
Line Sizes |
Coil Drive Power |
|
8705 |
Standard process design |
0.25% Standard
0.15% High |
15 - 900 mm
0.5 - 36 inch |
Pulsed DC |
|
8711 |
Compact light-weight |
0.25% Standard
0.15% High |
4 - 200 mm
0.15 - 8 inch |
Pulsed DC |
|
8721 |
Designed for food & beverage and life science, 3-A and EHEDG |
0.5% Standard
0.25% High |
15-100 mm
0.5 - 4 inch |
Pulsed DC |
|
8707 |
Best in P&P, M&M slurry flows, and noisy applications |
0.5% Standard
0.25% High |
80 - 900 mm
3 - 36 inch |
High-Signal
Pulsed DC |
Step 2: Liner Material Selection
| |
Liner |
Notes |
Temp Limits |
Type and Line Sizes |
|
PFA |
BEST FLUOROPOLYMER
Excellent resistance to chemicals and abrasion. Suitable for any application. |
-20 to 350°F (-29 to 177°C |
Flange
15 - 350 mm
0.5 - 14 inch |
Wafer
4 - 8 mm
0.15 - 0.3 inch |
|
PTFE |
BETTER FLUOROPOLYMER
More cost effective than PFA. Excellent chemical resistance, but less abrasion resistance than PFA. |
-20 to 350°F (-29 to 177°C |
Flanged
15 - 900 mm
0.5 - 36 inch |
Wafer
15 - 200 mm
0.5 - 8 inch |
|
ETFE |
GOOD FLUOROPOLYMER
Similar chemical and abrasion resistance to PTFE, but a lower maxium temperature an more expensive. |
-20 to 300°F (-29 to 149°C) |
Flanged
15 - 400 mm
0.5 - 16 inch |
Wafer
15 - 200 mm
0.5 - 8 inch |
|
Polyurethane |
Typically applied to clean water (no chemicals). Abrasion resistant to slurries with small particles. |
0 to 140°F (-18 to 60°C) |
Flanged
15 - 900 mm
0.5 - 36 inch |
|
Neoprene |
Typically applied to water and sea water. Abrasion resistant to slurries with small particles. |
0 to 185°F (-18 to 85°C) |
Flanged
80 - 1800 mm*
1.5 - 72 inch |
| |
Linatex |
Typically applied to mining slurries, abrasion resistant to larger debris. |
0 to 158°F (-18 to 70°C) |
Flanged
80 - 900 mm
1.5 - 36 inch |
Step 3: Electrode Type and Material Selection
| |
Electrode Type |
Application Notes |
| |
Button |
Standard electrode design. Use for most applications, especially where abrasion is a concern. Has fair resistance to coating which can be improved by properly sizing sensor. |
| |
Bullet-nose |
Use where coating is a concern and no solids are present. Bullet-nose electrode should not be used in abrasive or slurry applications as the particles will result in increased process noise on the electrodes. |
| |
| Electrode Material |
Application Notes |
| 316L SST |
Standard electrode material. Compatible with most low concentration water based applications. Avoid using stainless in higher concentration acid applications. |
| Nickel Alloy 276 |
Use in medium to high concentration acids where SST is not acceptable. Use in applications with high chloride concentrations, such as sea water. |
Platinum
(80% Platinum, 20% Iridium) |
Ideal for liquor applications found in pulp and paper industry. Also ideal as a spare electrode option to cover nearly every application in a plant. Compatible with nearly every process fluid. |
| Tantalum |
Ideal for high concentration acid flows such as hydrochloric and hydrofluoric acids. |
| Titanium |
Ideal for high concentration caustic (base) applications such as sodium and potassium hydroxides. |
Step 4: Transmitter Selection
| |
Type |
Notes |
Accuracy Option |
Power Supply |
User Interface Output Protocol LOI |
|
8732 |
Integral or remote mounting |
0.25% Std
0.15% High |
Global AC/DC |
HART®, Foundation™ fieldbus optical switch LOI or display only |
|
8712 |
Remote wall |
0.25% Std
0.15% High |
Global AC/DC |
HART Dedicated button LOI |
| 8712 High Signal |
Remote wall. Compatible only with 8707 flowtube |
0.5% Std
0.25% |
115V AC |
HART
Dedicated button LOI |
Step 5: Diagnostics and Enhanced Features
| |
Type |
Notes |
Availability |
|
Standard Diagnostics |
Transmitter hardware fault; transmitter software fault; sensor coil fault; empty pipe |
With every E-Series transmitter |
| |
D1 |
High accuracy option (0.15%) |
8732 and 8712 |
| |
AX |
Enhanced DI ⁄ DO capability |
8732 and 8712 |
| |
| |
HART ⁄ FF |
|
|
| |
DA1 ⁄ D01 |
Diagnostics suite includes: ground and wiring fault detection, high process noise detection. |
8732 and 8712 |
| |
DA2 ⁄ D02 |
Diagnostic suite includes: 8714i internal meter verification |
8732 and 8712 |
|
|
|
|
Competitive Advantage:
The 8700 Magnetic Flowmeter Systems provide obstructionless flow measurement that is ideal for metering any conductive fluid. A wide choice of construction materials provides compatibility with virtually all applications, from highly corrosive liquids to fibrous slurries often considered difficult to measure with other devices. Rosemount Magnetic Flowmeters offer the benefit of measuring flow in a package virtually unaffected by density, temperature, pressure, and viscosity change.
