Weigh Cells

Weighcell Products & Systems

Digital Rodcell System

Weight is the one physical characteristic that is common to every part that passes through a manufacturing or assembly process. As parts are machined, filled or assembled, the weight of the part or assembly changes. This is one reason why Comptrol industrial Weighcells are the obvious choice for:

Batching Check weighing Component verification Dispensing Fill-to-weight Machine-to-weight Mixing or sorting applications

 

By simply weighing a part or assembly, it is possible to determine the quality requirements such as: too many or missing components, the amount of material that has to be applied or removed, or if the proper amount of material has been applied or removed.

Comptrol Weighcell Systems provide the reliable weighing accuracy required for pre-process and post-process weight verification. The simplicity of their rugged design adds to the reliability of the system. It also allows each system to be configured to match customer part specifications and installation requirements for high volume automated production lines or stand alone inspection station.

Unlike total weight measuring devices, Comptrol Weighcells measure the difference between the part weight and the pre-set ideal weight of a good part. Defining the acceptable weight range in terms of the deviation limits instead of a total weight range, provides a more precise measurement of the actual part weight. This makes it possible for the Weighcell to quickly detect deviations as small as .01 gram.

When weight is applied, the Weighcell converts the measured weight deviation into a DC electrical output signal, directly proportional to the weight deviation. The signal is measured in volts so the Weighcell can be connected directly to a Comptrol Weighcell control, programmable controller, workstation, or system controller. Costly additional electronics are not required to amplify the signal. Comptrol Weighcell controls sample the part weight at a rate of 100 times per second. The control compares each sample to the programmed ideal part weight. When the sampling is complete, the control averages the readings. The total part weight is calculated based on the programmed ideal weight plus or minus the average deviation. The control may also provide an output signal for controlling other functions, such as machining, filling, or the operation of the part transfer system.

 

From specification to post-installation service, Comptrol works with you to ensure that your Weighcell meets your application requirements. We'll not only help you select the right Weighcell for your application, we'll also provide you with the mechanical, electrical and software interfaces you need to adapt our Weighcells to your new or existing process; plus the installation assistance and after-sale support Comptrol is noted for. Our experience working with OEM's, end-users, and system designers on numerous new and retrofit applications, is an added benefit we pass on to you.

 

DIGITAL RODCELL SYSTEM A more precise Method of Weighing. The Digital Rodcell System simultaneously weigh the pin and crank end of a connecting rod to determine the precise off-balance weight of each end. The deviation is converted to an electrical signal directly proportional to the amount of over or under weight.

Digital Signal Conditioning. At the heart of the microprocessor electronics id Comptrol's powerful signal processing firmware. This program features a unique "best weight" algorithm which continuously samples, captures and updates the pin and crank end outputs to the CRI-4000 digital display. This signal processing technique enhances the ability of the overall electronics package to minimize the effects of vibration and electromagnetic interference on the accuracy of the weighing process.

Pushbutton Calibration in Just Minutes. There are no potentiometers to tweak or dials to adjust. Everything is done with the push of a button, making the system easy to setup and operate.

Connect to a PC, PLC, Drive or Controller. Two ±3 VDC outputs are available from the CRI-4000 indicator for interfacing with a PLC or system controller. The RS-232 and RS-422 serial communication ports are provided for transmitting data. The Rodcell firmware automatically selects, combines, and outputs the pin and crank "best weight" values into an ASCII formatted string when the connecting rod is lifted off the cradle. This eliminates any possible errors added by PLC analog card and PLC timing logic.

Automatic Weight Transfer Compensation eliminates weighing inaccuracies caused by weight transfer inherent in any balancing application. During operation, the microprocessors housed in the Rodcell bodies communicate weight data back and forth, and factor in the compensation value stored in nonvolatile EEPROM during setup.

Automatic Rezero After Each Cycle ensures accuracy by negating the effects of temperature, dirt, and chip buildup on the cradle and Rodcell assembly. Each time a connecting rod is lifted off the cradle the system rezeros itself automatically.