Why buyers choose it

Dual-stage valve control

High-flow then fine-flow valves, so the batch stops on the set quantity.
Several inputs

Pulse or frequency, 4–20 mA flow or DP, 4–20 mA pressure and Pt100.

Outputs for the plant

Changeover relay, 4–20 mA retransmission and RS-485.
Programmable sequence

The valve sequence is set in a user configuration and tuned on site.

In detail

A batch controller is given a quantity, told to start, and closes the valves when that quantity has been delivered. This unit does that from a flow meter's signal, and it is also a flow totaliser and indicator in its own right.

Accuracy at the end of a batch comes from dual-stage valve control: a high-flow valve delivers most of the quantity quickly and a fine-flow valve finishes it. The sequence of the two is set in a user-programmable configuration that can be tuned to the application and the conditions on site, and the programme is selectable.

Its terminals take a pulse or frequency flow signal, a 4–20 mA flow or differential-pressure signal, a 4–20 mA pressure signal and a Pt100 temperature sensor. It drives a changeover relay, retransmits on 4–20 mA and communicates over RS-485.

It runs from 230 V AC and measures 160 × 85 × 95 mm, with an LCD and a keypad on the front.