WEIGHT TRANSMITTERS FOR SCALES

Model R1930 RS232 weight transmitter with Auto Cal

The model R1930 Auto Cal transmitter is a general purpose weight transmitter with RS232 output and inputs for up to four load cells.  Although intended for matched load cells of the Auto Cal type, the circuit board is also available with built-in summing for unmatched load cells.

The R1930 has been optimized for fastest settling together with high rejection of vibration frequencies;  both parameters can be preset from a built-in menu.  Software can also be modified on a custom basis for different applications.

The Auto Cal  advantage

Auto Cal is a shunt-calibration system that, when used with suitable Auto Cal load cells can eliminate test weights after the initial calibration.  Shunt calibration is a method of using a resistance in parallel with one arm of the load cell bridge to simulate a known load.  Once the scale is calibrated, the resistance is switched in and the reading recorded, for use in subsequent accuracy checks and recalibration.  When load cells are manufactured to tight tolerances they can be interchanged without need for recalibration, contributing further to the Auto Cal system.

A major feature of the Auto Cal system is its ability to compensate for the variation of gravity with latitude and altitude.  A little known fact, the force of gravity decreases as the distance from the center of the earth increases. because the earth is spinning, it flattens out towards the equator, which is 43 km wider in diameter than at the poles.  This can cause up to 0.5% error in scales that are based on force rather than the balance beam principle - and almost all electronic scales are currently based on force, since the load cell is a force measurement device.  Two corrections are provided in the Auto Cal system:  the first is applied during calibration and the second is applied during use.  This system allows scales to be calibrated at one latitude and altitude, and used at any other after the new coordinates are entered.  The correction is within 0.01% anywhere on the earth's surface.

SPECIFICATIONS

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Key Benefits

Great prices for large quantities - use information request.

Our sister company, Scale-Tron Inc. specializes in batching, control systems, moisture sensors and automation equipment for the concrete industry.

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Last modified: August 14, 2006