mxControl 8620 Automates Process Variable Control In RO: Burkert

Burkert claimed that the mxControl 8620 controller is capable of reducing control and measuring instrumentation costs to almost half in some cases.

Burkert’s mxControl 8620 constitutes simple monitoring and control functions, as well as the gathering of data that are integrated into one compact and easily configurable control unit with its integrated display and five soft-touch keys for the setting and display of all important variables and parameters.

Burkert’s 8620 is especially adapted for process monitoring and chemical control systems, through parameterisation of a number of control values, via an SD-card slot and a USB or Ethernet port.

Burkert said that an easily configurable PC-software helps adapt the controller to many types of process requirements and applications. Data such as flow rate, pressure, pH/ORP, conductivity, O2, Cl2, water level and temperature can be displayed, controlled, recorded and transmitted.

The multi-parameter-controller can be connected to up to six analogue and eight digital inputs (four of which can be flow), such as conductivity, pH/ORP, temperature, pressure, etc. It features up to four analogue and nine digital outputs for a multitude of conditions from simply retransmitting a process value, to pulse or frequency dosing a metering pump. In addition, the controller can transmit analogue outputs from one of the eight PID control blocks.

The mxControl process make sense for more complex RO-systems; however, a chemical pump combined with a compact pipe- mounted dynamic pH-transmitter/controller like Burkert’s 8205, is sufficient for simpler RO-systems where only the feed water pH needs to be lowered.

In these applications the combination of Element transmitters that can transmit process values and temperature can also perform simple on/off control or alarm functions to reduce overall system costs.

The Element units are field- mounted devices that enable quick refitting and upgrading of simple RO-processes. Apart from measuring the conductivity, pH and ORP, the Element range of transmitters also have options that enable transmission and on/off control of temperature. The transmitters are programmed via a removable module that could be left with the unit if local display is required.

If values deviate from the originally programmed set value, the transmitter triggers a transistor switch that opens or closes a valve or starts a pump allowing the influx of fresh water or chemicals to regulate the pH, conductivity, temperature or ORP.