Rosemount 8721 Hygienic Magnetic Sensor--MARISEM

Rosemount 8721 Hygienic Magnetic Sensor

Category: 电磁流量计 Publish Time: 2013-11-19 14:40

Rosemount 8721 Hygienic Magnetic Sensor

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)

Features & 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

Specifications：

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

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

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