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Rosemount 8721
Accuracy Up to 0.25% of volumetric flow rate accuracy over 13:1 flow turndowns, 0.5% over 40:1 flow turndown
Line Sizes ½-4 inch (15-100 mm)
Liner Materials PFA
Electrode Materials 316L Stainless Steel, Nickel Alloy, Platinum
Process Connections Tri-Clamp® Sanitary Coupling 
IDF Sanitary Coupling (screw type) 
Weld Nipple 
DIN 11851 (Imperial and Metric) 
DIN 11864 (-1 and -2 Form A) 
SMS 1145 
DEN US 50 Weld Nipple
Product Certifications 3-A, EHEDG Type EL, PMO (M-b-350)
Interchangeability

Compatible with all E-Series transmitters. 

Compatible with Legacy transmitters.

  •  8712D
  •  8712C
  •  8732C
  •  8742C

 

The Rosemount 8721 Hygienic Magnetic Sensor is specifically designed for food, beverage and pharmaceutical applications that require a reliable, safe, and hygienic design.

  • All-welded sensor designed for food, beverage and pharmaceutical applications

  • Contact surfaces constructed of FDA-approved materials that comply with 3-A and EHEDG standards

  • Lightweight compact design makes installation easy

  • Sizes range from 0.5 to 4 inch (15 to 100 mm)

Benefits

  • Product contact surfaces constructed of FDA approved materials designed in accordance with 3A and EHEDG standards.

  • Sensor is CIP ⁄ SIP cleanable, and the sensor I.D. matches the process piping to eliminate hard-to-clean step changes.

  • Available with a variety of sanitary process connections with easily accessed process gaskets to facilitate inspection and maintenance.

  • Compact, all stainless steel meter body is fully-welded, and critical junctures are potted to provide a hermetic seal, protecting the internal components and wiring from pressurized steam, water and sanitation chemicals

Applications

The 8721 hygienic sensor is specifically designed for the demanding applications in food, beverage, and life sciences. The robust, all-welded, full diameter sensor is constructed of FDA approved materials that are fit for purpose, and is authorized to display the 3-A Symbol (Authorization #1222), is certified by EHEDG (#C03-5229) and is approved for use in FDA Grade A milk meter based timing loops (M-b 350). Sizes range from ½” (15mm) to 4” (100mm) and are available in a variety of industry standard process connections.

Availability

With a wide range of liner and electrode materials available, the Rosemount 8700 Series Magnetic Flowmeter family is suitable for virtually any conductive liquid application. Rosemount Magnetic Flowmeters offer the benefit of measuring flow in a package unaffected by density, temperature, pressure, and viscosity change.

 
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

 

Download:
  • Product Data Sheet Rosemount 8700 Series Magnetic Flowmeter Systems
  • Technical Data Sheet Sanitary Gasket Material Selection Guide