Water Treatment Controllers

Process Instruments not only makes the best analyzers but also the best controllers. With the advent of Industry 4.0 and Water 4.0 distributed control is being seen as the future for water production and treatment. The Pi analyzer have as options a range of control functions that are industry leading in their own right. PID and flow proportional PID with essential features such as overfeed protection, integral wind-up protection, min and max pump outputs etc. Pi’s multi-channel controllers can measure and control up to 16 measurands and provide remote access via the internet to your mobile or laptop allowing you to change settings wherever you are.

Conductivity meter


The ConductiSense range of online conductivity meters from Pi utilize the very latest and best conductivity sensors available in the world today for measuring the online conductivity of any aqueous solution.

Ozone Sensor


Online, continuous Chlorine Dioxide Analyzers, Chlorine Dioxide Monitors, Chlorine Dioxide Meters and Chlorine Dioxide Controllers make up the DioSense range.



The HaloSense range of monitors are used in many applications requiring the measurement and control of online residual chlorine levels.


Multi-Parameter Analyzer

Multi-sensor, multi-parameter, multichannel analyzers can greatly reduce the cost per point of any measurand including pH, residual chlorine, ORP, ozone, etc.

ORP Sensor


The ORPSense range of ORP Meters from Pi utilize the very latest and best ORP sensors available in the world today for measuring the online Redox potential of any aqueous solution.

Dissolved Oxygen Meter


The OxySense range of online DO meters utilizes the very latest and best optical DO sensor available in the world today.



The Residual Ozone Analyzer from Pi for the measurement of ozone concentration in water, is designed to be simple to install and operate and offers unrivalled stability, accuracy and precision.

ParticleSense Particle Counter


The first particle counters to allow multiple sensors on a single analyzer. The CounterSense is a sophisticated particle counter with the capability to size and count particles from 2 to 127 microns.

Pi’s pH sensor- pHSense for potable water and process applications


The pHSense range of online pH meters from Pi utilize the very latest and best pH sensors available in the world today for measuring the online pH of any aqueous solution.

Suspended Solids Monitor


Whatever level of suspended solids from 2 NTU all the way up to >8% solids, the SoliSense® is the solution.

Turbidity Meter


Anywhere where the measurement range is 0.01-1000 NTU (approx 0-2000 mg/l, application dependent) is a suitable application for the TurbSense® online turbidity meter.



The UV254Sense UVA/UVT monitor provides real time organic UVA (ultra-violet absorbance) and UVT (ultra-violet transmission) analysis.

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