Contrec 505 – BC04

Analogue Input Batch Controller, Tailored for Inputs from Mass Flow Meters

The 505 BC04 application is a dual stage batch controller for reliable measurement of preset quantities using a mass analog input. Used as a single or dual stage contoller it is suitable for fast batch applications.

It provides the operator with clear local readout and can be controlled via communications in more automated systems. There is quick access to commonly used preset values directly from the front panel if access has been authorized. Automatic overrun compensation caters for system delays such as valve closure for precise volumes.

The analog input can be scaled as well as having filtering, square law or non-linear correction and cutoff points applied to the signal.

CALCULATIONS

To derive the flow rate, the analog input is normalised to a value (A) between 0 and 1.

mass flow = (Mf max – Mf min)A + Mf min

mass = ∫( massflow × Dt )

Automatic overrun compensation calculates the new valve closure point to ensure correct delivery by averaging the overrun amount from the last three complete batches.

The overrun compensation value is valid for a new preset value provided the stored overrun is less than 20% of the new preset.