Mode of operation

Milltronics integrators from Siemens incorporate proven electronic load cell balancing to perform basic and sophisticated level and flow control functions. Integrators process the speed or load signal from the sensor and perform functions to convert the data into rate or totalization. The integrator displays primary speed and load values, as well as derived values of rate and total on the LCD, or outputs the information as analog mA output, alarm relay, or remote totalizer.

The Milltronics BW500/L offers standard control functions for use with belt scales. It offers multiple language selections and industrial communication options.  It can be used with a maximum of two load cell style belt scales.

The Milltronics BW500 are versatile integrators for use with a wide range of belt scales. It is NTEP and Measurement Canada certified as legal-for-trade when used with an MMI-2 belt scale and WS series speed sensor.

The Milltronics BW500 and SF500 offer online calibration so the process does not need to be shut down to calibrate the integrator. Both models also offer linearization, PID and batch control, multi-span and auto zero.

Definitions

PID – Proportional, Integral, Derivative – The PID control function combines proportion, integral reset, and derivative rate to consistently control systems.

A proportioning band creates an area around a set-point where the controller is controlling the process. If the band is too narrow, the reading will center around the set-point. If the band is too wide, the control values will take a long time to settle and will be slow to respond adequately to upset conditions. An integral reset corrects for any difference between the desired set-point and variables altered during the process. A derivative rate prevents the control from shifting too dramatically on process upsets or startups.

Batch Control – A predetermined quantity of material is accumulated, and the integrator will alarm, notifying that the batch process is completed.

Linearization – Locations where the ideal belt scale or flowmeter location has been compromised or where there is a high variety in belt tension or flow cause the belt scale or flowmeter to report non-linearly. The integrator linearization function smooths out the result to provide an accurate report of the process.

Multi-span – The integrator can be calibrated for up to 8 different feed conditions that would produce varying load or rate characteristics. A span correction is added to the measurement to realize maximum accuracy.

Differential Speed Detection – Dual point belt speed sensing is used for monitoring speed at two different points in the system. The two speed sensors are typically applied on belt conveyors to give an alarm if excessive slip between the head pulley and tail pulley is detected (BW500 only).

Incline Compensation – By receiving a mA signal proportional to conveyor slope, the conveyor loading can be re-calculated to compensate for changes in angle (BW500 only).

Moisture Compensation – By receiving a mA signal proportional to moisture content, the conveyor load or rate can be re-calculated to read dry weight (BW500 or SF500 only).