Contrec 505 – BC03

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

The 505 BC03 application is a dual stage batch controller for reliable measurement of preset quantities using a mass frequency 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 instrument is compatible with a wide range of flowmeter frequency outputs, including millivolt signals, reed switches, Namur proximity switches and pulse trains via its smart front-panel program selection.


The total and flowrate are derived from accurately measured frequency and the number of received pulses.

mass = pulses / k-factor

mass flow = frequency / k-factor

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.