Amplifier speeds weighing system calibration
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Sensor Techniques product story
Edited by the Engineeringtalk editorial team
Jun 15, 2006
An industrial digital weight amplifier provides a simple and easy method for calibrating industrial weighing systems, without the need for calibration weights or flow meters.
The DAS72 industrial digital weight amplifier provides a simple and easy method for calibrating industrial weighing systems, without the need for calibration weights or flow meters.
This high precision unit has already shown to be particularly effective for high capacity systems.
Calibrating large vessels and silos can be a daunting and costly task especially if there are no built-in facilities to apply calibration weights.
Even then applying sufficient load is usually impractical, especially in view of health and safety regulations on lifting.
The most common calibration method is to fill the vessel with a known amount of material that has been weighed on a weighbridge.
However once the material has been added, removing it to check the zero, except through normal process usage, is not possible.
As a result many vessels are not correctly calibrated, resulting in a range of cost and process related problems.
By contrast the DAS uses information relating to the load cell capacity and its mV/V sensitivity to achieve accurate and fast calibration.
With the vessel empty, set up is carried out via the keypad with prompts guiding the user through the simple procedure.
Once the zero has been set, the user then enters the data on the load cell capacity and sensitivity to complete the calibration process.
The DAS72, which can drive up to four 350ohm load cells, comes as standard with a fast 600 samples per second 4-20mA analogue output and a RS422/485 multidrop communication port.
The three programmable logic inputs and three open collector logic outputs can be used for a range of control functions including set point and alarm operation.
The unit can be powered by an unregulated 11-25V DC power supply making it ideal for industrial and agricultural applications.
The DIN rail mounted version has a built-in digital display with a maximum display value of +/- 99,999 counts.
The DAS is part of Sensor Techniques extensive range of weight amplifiers, weight controllers, digital displays, load cells and mounting assemblies.
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