Part of our controller range, the CRONOS® is the less capable, and therefore less expensive, cousin of the CRIUS®4.0.

The CRONOS® is a top-quality, low-cost transmitter designed to arm water treatment engineers with everything that they need from a transmitter, without any unnecessary hardware or firmware. With no frills, costs can be kept minimal, whilst optional communications packages allows for Profibus, Modbus ASCII, Modbus RTU, Modbus TCP, 4-20mA analogue outputs, and relays for alarms and control.

As standard the CRONOS® comes with the same interface and firmware as the world-leading CRIUS®4.0, with all the same capability just reduced, so less I/O (up to 2 sensors) and a grayscale display.

Highest Quality – Low Cost – Superior Functionality

The CRONOS® is capable of controlling up to two sensors of any type with relevant analogue outputs and relays. With optional PID control, the CRONOS® is quite capable of controlling complex water treatment processes, all at a fractional cost of other controllers.

If you have any questions or would like to find out more about Pi's controllers please contact us below.

Focus On

Focus Ons are a series of short articles distributed by email providing technical information regarding instrumentation, process measurement in potable, waste, process and pool waters. If you would like to join the mailing list, please contact us.


CRONOS® is a perfect fit if you’re looking for a low cost, no frills controller for use with up to 2 sensors. If you require more sensors or remote access, the CRIUS®4.0 is the controller for you.
CRONOS® is restricted to 2 sensor inputs.
CRONOS® can have up to 2 analogue outputs and 8 relay outputs.
Not as standard, but this can be added for a fee. Datalogging is a standard feature of the CRIUS®4.0.

Not as standard, but this can be added for a fee. A color display is a standard feature of the CRIUS®4.0.


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