Magnetic Level Gauge - Kenco Magna-Site

Magnetic Level Gauge - Kenco Magna-Site™

The KENCO Magna-Site™ is a magnetic liquid level indicator used to determine the volume of liquid contained within a vessel. Because the Magna-Site™ eliminates the need for glass, high pressure applications and hazardous locations are protected from the danger of a chemical spill due to glass failure.

The KENCO Magna-Site™ utilizes three major components: the gauge housing chamber, the magnetic float and the magnetic flag assembly.

The gauge housing chamber is mounted adjacent to the side of the vessel. It is constructed to withstand the same temperatures and pressures as the tank itself.

It is equipped with the appropriate tank mounting connections for easy installation and to allow equalization of liquid level in tank and gauge.

Inside the gauge housing chamber is the magnetic float, which contains radially-positioned magnets to provide a 360° magnetic-flux field. Each float is internally weighted based on specific gravity so that the liquid level in the gauge coincides with the location of the magnets inside the float.

Attached to the gauge housing chamber is the magnetic flag assembly. This is the visual means of liquid level indication for the KENCO Magna-Site™. The assembly is made up a of a series of bi-colored fluorescent flags. As the magnetic float rises and falls with the liquid level in the gauge housing chamber, a magnet embedded in each flag reacts to the 360° magnetic flux of the float. This magnetic interaction causes each flag to rotate 180°. The flags below the magnetic flux of the float will flip to fluorescent green, while those flags above the float level remain steel gray.

GAUGE FEATURES:

Maximum safety -- No glass is used in the construction.
Optimum visibility -- Fluorescent flags are visible from great distances
Float with 360° magnetic flux -- Maintains a strong magnetic field in all directions; turbulent liquids will not cause flag assembly to give an inaccurate level indication

Double flag protection -- Flags are hermetically sealed inside a PTFE encapsulated assembly which is shrouded by a 300 series stainless steel enclosure on three sides with a UV stabilized high-impact clear polycarbonate shield
Adjustable viewing angles -- Flag assembly can be rotated to any angle to provide maximum visibility
Multiple mounting options -- Engineered construction allows for a variety of mounting configurations
Compatibility -- A broad range of materials can be used to withstand harsh chemicals
Remote level indication -- Explosion-proof magnetostrictive level sensor/transmitter provides a 4-20mA signal output
Height scale -- 304 stainless steel with no. 3 finish and large etchedcharacters/lines for easy reading
High/Low level switches -- Explosion proof switches can signal an alarm, operate a pump/valve or act as an emergency shut down
Convenience -- Easy installation and very low maintenance
Warranty -- Three year guarantee against defects
Reliability -- KENCO has been building magnetic liquid level indicators since 1986.

INDUSTRIES SERVED:

Chemical and Petrochemical Refineries
Water and Waste Treatment
Pulp and Paper Processing
Power Plants
Pharmaceutical Processing
Food and Beverage Processing

COMMON APPLICATIONS:

Fuels and Solvents
Oil Production and Refining
Lubrication Oils
Detergents and Soaps
Boiler Feedwater Tanks
Fertilizers and Pesticides
Ammonia Tanks
Scrubber Tanks
Storage Tanks
Acid Tanks

Magnetostrictive Transmitter

TRANSMITTER FEATURES

CSA approved explosion-proof housing

Digital display for zero and span settings and readout

Readout is updated every 3 seconds

Readout available as a % of span, a 4-20 mA output or any unit of measure

Repeatability is .005% full span or .005 inches

Temperature range: -40 to 300°F (call KENCO for higher temperature requirements)

No maintenance required

Immune from electrical and mechanical noise

HART® Communications are standard

KENCO LEVEL TRANSMITTERS

KENCO level transmitters electronically monitor the location of the magnetic float within the Magna-Site*TM gauge housing, providing an output in a unit of measure as a % of span or a 4-20 mA output. The KENCO transmitter is available up to a length of 300 inches. Zero and span may be adjusted using the HART communications protocol, or it may be manually calibrated using the keypad display inside of the explosion proof housing . These transmitters operate within a process temperature range of -40 to 300°F for most lengths (see specifications). Field replaceable electronics are potted and encapsulated. KENCO transmitters are available as standard with NEMA 4X/7 type electronics housings. These housings feature an industrial epoxy coating for corrosion resistance. All KENCO level transmitters use non-contacting, magnetostrictive technology. This simple design ensures no scheduled maintenance or re-calibration -- ever. Accurate, non-contact float location sensing is achieved with absolutely no wear to any of the sensing elements.

PRINCIPLE OF MAGNETOSTRICTION

The level transmitter is composed of two concentric members. The outermost member is a protective 316 stainless steel chamber that withstands aggressive or harsh process industry environments. The heart of the transmitter design is the innermost member, the waveguide, a formed element, constructed of a proprietary magnetostrictive material.

A pulse is induced in the waveguide by the momentary interaction of two magnetic fields, one from an electric current pulse launched along the waveguide and the other from the magnet inside the float. This interaction produces a strain pulse that travels along the waveguide. The location of the magnet inside the float is determined by measuring the elapsed time between the launching of the electronic pulse and the detection of the strain pulse by the sensor head. The time period measurement is used to produce a 4-20mA output.

PRODUCT WIRING-NON HAZARDOUS LOCATIONS (INTRINSICALLY SAFE)

PARAMETER SPECIFICATIONS

LEVEL OUTPUT

Measured Variable		Product Level
• Full Range		0.5 to 25 ft. (152 mm to 7.6 m)
• Non-linearity Full span		0.100 % F.S. (Independent BSL) or 1/32 in. (0.794 mm), whichever is greater.
• Repeatability		0.01 % F.S. or 0.015 in. (0.381 mm), whichever is greater.
• Temperature Sensitivity		Zero: (0.003%/°F (0.005 %/°C)
• Sensor Operating Temp.		Operating temperature is -30 to 300°F. Contact Kenco for higher temperature requirements

TRANSMITTER LOOP

• Input Voltage Range		10.5 to 36.1 Vdc
• Reverse Polarity Protection		Series diodes
• Safety Approval		CSA certified explosion-proof Class I, Division 1, Groups B, C, and D

CALIBRATION

• Zero Adjust Range		Anywhere within the active length
• Span Adjust Range		FS „ 0.5 ft. (152 mm) from zero

ENVIRONMENTAL

• Sealing		Potted sensor cartridge and electronics
• Humidity		0 to 100 % R.H.
• Operating Temperature		-30 to 160°F (-34 to 71°C)
• Materials		316 stainless steel

FIELD INSTALLATION

• Transmitter Length		Up to 25 ft. (7.6 meters)
• Wiring		Two-wire connection, shielded cable or twisted pair to screw terminals through a 3/4 in. (12.7 mm) NPT conduit opening

* NOTE: The transmitter head can be rotated 360° when mounted as shown above.

*NOTE: Typically, KENCO adds 3" to the order length to increase mounting flexibility. Units are factory calibrated with an additional 3" at the top of the gauge.

MOUNTING INSTRUCTIONS

The KMD transmitter is mounted directly to the housing of the KENCO Magnetic Liquid Level Indicator. In a typical configuration, the magnetic flag assembly and transmitter are attached to the gauge housing with hose clamps which have been welded to the back of the flag assembly, typically 180° from the flanged or threaded connections to the tank. Install the transmitter to the right or left of the flag assembly by placing the transmitter sensor tube 90° to the right or left of the flag assembly (your choice) by placing the outer pipe of the transmitter body adjacent to the gauge housing. Tighten the mounting clamps provided around the transmitter sensor tube. Allow for a minimum inactive zone of 3 inches at the bottom of the sensor tube by placing bottom of sensor 3 inches below the zero setting (centerline of bottom gauge process connection). Your application will allow for 5 inches of clearance at the top of the outer pipe.