Magnetostrictive Level Transmitters

Magnetostrictive Level Transmitters

KMD Magnetostrictive Transmitter

The Model KMD is an advanced, state-of-the-art, two-wire, Magnetostrictive-based level transmitter suitable for a wide range of process applications. The latest microprocessor technology allows this instrument to consistently and reliably measure the level of your process fluid.  Built-in Hart® Communications allows for remote calibration and diagnostics. The optional onboard display and keypad is for local display and calibration. The Model KMD can measure overall level, interface level and process temperature. Up to two 4-20mA output loops are available to track any two of these three variables. The standard single chamber, or optional dual chamber enclosures are explosion proof for hazardous locations. The Model KMD is also intrinsically safe when used with the appropriate safety barriers.

Principle of Operation

The sensor portion of the Model KMD transmitter consists of three concentric tubes. The outer tube (pipe) protects the inner tubes from the process evironment. This outer tube is constructed of a material that is compatible with the process media being measured. The next tube contains a resistive temperature device (RTD) for accurate temperature measurement. The innermost tube is the heart of the system. This tube is known was the waveguide. It contains a formed wire made of a proprietary Magnetostrictive material. The main electronics gernerates a low current pulse, creating an electromagnetic field around the waveguide. When this electromagnetic interacts with magnetic field from the magnets in the float, a twist in the waveguide occurs. This twist is detected in the main electronics as a return pulse. The time between the initial pulse and the return pulse is measured, and is used to determine the exact position of the float, thereby providing a very accurate level measurement.


  • Extremely High Accuracy and Resolution
  • Multi-Variable Measurement Through One Process Connection
  • Onboard Display and Keypad(optional)
  • Hart® Communications
  • Explosion Proof / Intrinsically Safe

Benefits of Ownership

  • Better Process Control
  • Installation Flexibility
  • Local Viewing of Process Data
  • Easy Calibration and Service
  • Increased Safety in Hazardous Areas


  • Hydrocarbons
  • Solvents
  • Water
  • Acids
  • Caustics
  • Condensate
  • Clean Liquids

Industries Served

  • Chemical
  • Petroleum
  • Water/Wastewater
  • Pharmaceutical
  • Pulp & Paper
  • Power
  • Aerospace


Magnetostrictive Level Transmitters Float on Cover Magnetostrictive Level Transmitters Cover smaller


Float Selection

KENCO offers a wide variety of floats to meet the most demanding applications. Floats with specific gravities as low as 0.35 are available. Floats are available in the following materials: 316 SS, Hastelloy-C® and Nitrophyl. Due to the wide range of variables possible in process conditions, no single float can be used in all applications. KENCO will assist you in choosing the best float for your application.

KENCO recommends selecting a float with a specific gravity at least 0.05 less than the fluid being measured. In addition, there must be a minimum difference of 0.05 S.G. between fluids for interface applications.


  • Single Loop = 1
  • Dual Loop = 2
  • Single Loop (MLG) = 3

Housing Type

  • Single Cavity = B
  • Dual Cavity = C
  • Single w/ Display = D
  • Dual w/ Display = E

Construction Material

  • 316L SS = 1
  • Hastelloy-C® = 3
  • Teflon® Sheathed 316L SS = A

Process Connection (Type)

  • Swaged NPT = 1
  • Welded NPT = 3
  • 150# Flange = 6
  • 300# Flange = 7
  • 600# Flange = 8
  • None = X

Process Connection (Size)

  • ¾” (NPT / Flange) = A
  • 1″ (Flange Only) = B
  • 1 ½” (Flange Only) = C
  • 2″ (Flange Only) = D
  • 2 ½” (Flange Only) = E
  • 3″ (Flange Only) = F
  • 4″ (Flange Only) = G
  • 6″ (Flange Only) = J
  • None = X


  • None = 0
  • 3″ from Bottom Tip of Sensor = 1
  • Customer Specified Location = 2

Measurement Units

  • Millimeters = M
  • Inches = U

Sensor Length

  • Inches (xxx.x) = (20-300 inches)
  • Millimeters (xxxxx) = (508-7620 mm)