The Contrec 424 is a batch controller for flow applications needing precise control of batch quantities, reading a pulse or frequency signal from a turbine, paddlewheel, or similar flowmeter. It drives two relays for dual-stage valve control, the first one opens at the start of the batch and closes when it’s done, while the second can be set to slow the flow down before the target is reached, so the batch doesn’t overshoot on a fast-closing valve.
One thing we like about this one is the automatic overrun compensation, it learns from the previous batch how much product keeps flowing after the valve signal closes, and adjusts the next batch’s cut-off point accordingly. It also has a signal timeout alarm if the flowmeter stops sending pulses mid-batch, which catches a stuck or failed flowmeter before it turns into a bigger problem. RS232 and RS485 ports let it talk to a printer for ticket printing with batch number and timestamp, or to a computer for logging, and remote start/stop is supported through a simple push-button switch if the customer wants to trigger a batch away from the panel.
Before we quote this, we would normally confirm the flowmeter’s pulse output characteristics, whether ticket printing is actually needed since that decides if a printer needs to be quoted alongside it, and whether the installation needs the standard enclosure or the ATEX/IECEx explosion-proof version. Hope this helps.
