The Babbitt LTM series Magnetostrictive Level Transmitter is an accurate, stand-alone, loop-powered device, usually mounted in the top of a tank or other container. It may also be used as a level transmitter when mounted externally on a Babbitt Magnetic Level Gauge. The unit is suitable for liquid applications that require high accuracy and repeatability.
The unit may be ordered in several configurations that will give outputs of simple level, level and temperature, or two levels as in an interface application. The Primary 4-20ma output is used for Level and optional HART protocol communications. The Secondary 4-20mA output may be used for Level or optional Temperature.
The unit may be calibrated on the bench or in the tank where it will be used. Simply locate the float where you want the "Zero", press a button, then move the float to the "Span" position and press another button. It's that fast and simple! The memory is non-volatile, so the unit stays calibrated even during loss of power.
The sensor consists of a 5/8" stainless steel tube with a heat-treated wire stretched through the center of it. A magnetic float is placed around the tube and tracks the fluid level. A low power microprocessor-controlled cicuit produces a high current pulse which is transmitted down the heat-treated wire. The magnetic field in the float interferes with the high current pulse creating a torsional wave which is "bounced" back to the electronics. The transit time of the wave is converted to a 4-20mA signal, proportional to the fluid level.
Magnetostrictive Series Product Brochure