Multi parameter conductivity meter for measuring conductivity in water and wastewater

USI – Flow & Water Quality

The Universal Smart Instrument (USI) Flow and Water quality instrument is uniquely designed for waste water flow and simultaneous water quality measurement. The instrument comes standard with an ultrasonic sensor for flow measurement and an integral pH/Redox meter.

Up to 7 water quality parameters can be measured in one device, therefore several standard instruments can be replaced by a single USI. See the features and benefits below, and for full details of the USI’s range of measurement and control refer to the product brochure.


  • Ultrasonic Sensor as standard
  • Advanced Open Channel Flow meter with integral pH/ISE meter
  • Optional Turbidity, Dissolved Oxygen, Temperature and Conductivity inputs
  • Optional measurement of Ammonia, Ammonium, Chloride, Calcium, Fluoride, Nitrate, Potassium.
  • Quick and simple user-friendly programming
  • Integral 30-year data logger
  • PC based reporting software
  • IP 66/4X Wall mounted weatherproof enclosure
  • 6 Programmable relays
  • 4-20mA inputs and outputs


  • Trade Effluent Monitoring
  • Waste Water Monitoring
  • Drinking Water Monitoring
  • Water Quality Monitoring
  • Seawater Monitoring
  • Irrigation Channels
  • Storm Water Monitoring
  • Combined Flow and Water Quality Measurement

The parameters available to be measured with our USI:

Ion Selective Electrode Choice# Optional Modbus Choice*
pH Conductivity
Redox Dissolved Oxygen
Ammonia Turbidity
Ammonium pH/ORP
Calcium Inductive Conductivity
Chloride TSS
Potassium *Note: All Modbus have integral temperature sensor measurement. #Note: Other ISE parameters available on request.

Sensors can be either free mounted in tanks or channels or inserted into pipes using Smart Storms bespoke pipe brackets.

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Instruction Manual



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The USI water quality meter comes as standard with an ultrasonic sensor and an integral pH meter.

To implement the pH meter, purchase an ISE pH sensor which will connect direct.

You can add further Modbus water quality sensors from a choice of:

pH, Turbidity, Dissolved Oxygen and conductivity. Each of these sensors has an integral temperature sensor.

One Modbus sensor can be connected directly to the USI. However up to four Modbus sensors can be connected via the optional interface box.

The USI will log all parameters measured for up to 22 years. It comes with a pc based software package and a USB stick as standard. Data can be downloaded onto


I want to just measure flow:

Purchase:  USI only

I want to measure flow and pH

Purchase: USI and the ISE pH sensor

I want to measure Flow, pH and Turbidity.

Purchase: USI, the ISE pH sensor and the Modbus Turbidity sensor

I want to measure Flow, pH, Turbidity and Dissolved Oxygen

Purchase: USI, the ISE pH sensor, the Modbus Turbidity sensor, the Modbus Dissolved Oxygen Sensor and the Interface box.

Isolated 4-20mA inputs are required where the input cable may be subject to high voltage spikes either from other electrical machinery or lightening. These could seriously damage the USI and in such applications isolated inputs should be added as an option.

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