LC-137 LVDT Load Cell

The Thayer Series LC-137 Load Cell is a force measuring device designed specifically for use with Thayer Scale “reverse-action” Flexure-Based suspension systems. It is a precision-built, heavy duty device manufactured in a series of force ranges that complement the capacity ratings of Thayer’s various flexure-based systems. Designed for long term stability and accuracy under the most demanding applications, it functions to convert load force, as sensed on weight measuring equipment in various material handling systems, to a proportional electrical signal. It is initially calibrated and installed by the factory and requires no routine maintenance.

The LC-137 is a temperature compensated precision deflection, non-contacting mechanism, which transfers mechanical displacement to the armature of a Linear Variable Differential Transformer (LVDT) contained within. A constant AC input is applied to the primary winding of the LVDT. The secondary winding thus produces an AC output voltage which is proportional to the displacement, or weight sensed. The AC output of the Load Cell’s LVDT is converted through A/D converter with twenty bit resolution (1 part in 1,048576 count) for a signal proportional to weight. This signal is sent to a remote instrument without analog line loss.

The load cell is designed to be mounted on a fixed foundation with the loading force received via a short flexible (pre-stretched) wire cable. This cable is kept in tension and actuated by a lever system which is an integral part of the scale. The overall design is such that the force input is perpendicular to the load cell. Counter balance weight(s) on the lever system provide for establishing the proper zero (null) signal output for zero scale load.

The LC-137 is also equipped with a bellows type seal, and the internal mechanism incorporates viscous damping for stabilization in vibratory environments. The LC-137 load cell and temperature compensating features are comprehensively tested during manufacture. Excellent temperature coefficients are obtained through the use of proprietary software routines, resulting in extremely stable, accurate, and trouble-free performance.