Weight Transmitters for Scales
Scale-Tron manufactures a range of weight transmitters for use in automation, 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 1945 USB 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. The 1945 USB transmitter replaces the 1932 RS232 transmitter in all new scale projects.
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 as a result. Auto-Cal is optional on the 1945.
Weight transmitter specification
|Load cell excitation:||4.5 volts, up to four 350 ohm load cells (Scale-Bars) or ten 1000 ohm load cells (Mini-Mounts)|
|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 case mounting holes as for 1932 but half the size|
|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|
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