We get enquiries from customers who need to dispense a fixed quantity of fluid, quickly and accurately, every single time. Think chemical batching, lubricant metering, or filling stations where the target volume must be hit consistently, batch after batch.
This looks simple on paper, but in actual application, a single-stage valve struggles here. If you fill fast right up to the target, momentum in the line causes the batch to overshoot. If you fill slow the whole way, the cycle takes too long. The Contrec 515 BC01 solves this with a dual stage approach: one relay drives a coarse (fast) valve for the bulk of the batch, then switches to a fine (slow) valve as the target volume gets close, so the last bit is metered in gently.
It also has automatic overrun compensation built in. The controller keeps track of how much the batch overshoots each cycle, and adjusts the valve closure timing on the next run to compensate. Over a few batches, this tightens up accuracy on its own without an operator having to fine-tune anything.
On the input side, it accepts frequency signals (pulse, turbine coil, or Namur proximity switches up to 10kHz) or analogue 4-20mA, 0-5V, and 1-5V, so it works with most flowmeter types already installed on site. Before we quote this, we would normally check what flowmeter or sensor you already have, your line pressure and fluid type, and how many batch stages your process actually needs.
Hope this helps.
