Weight Transmitters for Scales

Scale-Tron manufactures a range of weight transmitters for use in automation and batching systems and commercial scales.

USB weight transmitter with Auto-Cal

With both power and data direct from the PC computer’s USB port, the 1945 weight transmitter allows PC applications to access weight or force readings from any load cell assembly with high precision and settling speed.  The transmitter has 24 bit resolution and typical noise/jitter of better than 1 part in 100,000 at settling times of ½ second or less.  PC software handles setup and calibration.


A detailed application manual gives information to interface the transmitter with software for the user's main application; engineering and software assistance is available on request . . . . Read more

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.  Auto-Cal is optional on the 1945.


Weight transmitter specification

Load cell excitation: 4.5 volts, up to 4 – 350 ohm load cells
Load cell signal: 0.2 – 4.0 mV/V full scale
Compatibility: all scales listed in main menu
Resolution: 15,000 displayed counts with less than 1/10 count RMS jitter
Reading speed: 20 readings per second max (polled).  Up to 50 per second and streaming data available on special order
Filtering: Advanced 3-stage adjustable digital filter – extremely fast settling with good noise rejection
Output: USB “B” type connector, female, and 4-pin lockable Molex Micro-Fit connectors for both power and data
Load cell inputs: Four 8-pin lockable Molex Micro-Fit connectors
Power: 5V DC +/- 0.25V  from USB connection or external to 4-pin Micro-Fit connector
Physical: steel case 5.5″ x 2″ x 1″ or bare board.  Same mounting holes as for R1930/1932 below
Optional shunt calibration: Switchable shunt resistor creates reading to confirm calibration at power-up
Optional Virtual Serial Port (VCP): Allows the USB connection to appear as a serial RS232 port when using Windows