Can Smart Devices Enhance Water Resource Recovery Facilities? Part 2

As part of our series on 'smart' devices we'll continue our review of process instrumentation. The online measurement systems available today are far superior to versions available just a decade ago providing more measurements more reliably, and at a reduced cost.  As a result, there are more opportunities for enhancing the performance and efficiency of water resource recovery facilities (WRRF). YSI’s solution for online process monitoring, IQ SensorNet, is a network-based, modular system.  Each of the four basic components of the system, sensors, cables, modules, and controllers, has features that make implementation simple and effective. The main topic of this blog is the modules. The other three components are discussed in separate blog articles.

One of the most innovative features of the IQ SensorNet is that operating functions are physically and functionally modularized. Physically, each IQ SensorNet module is an identical 5 5/8 – in. x 5 5/8 – in. x 2 in. IP-66 rated polycarbonate box with 4 cable glands.  Each module has contact carriers on the front and back allowing stacked mounting of up to 3 modules (see image) with no wiring and includes at least 2 internal SensorNet terminals for connection of sensors or distributed mounting with additional modules through network cable.YSI-IQSN-Modules-Blog-Post.jpg

Functionally, each IQ SensorNet module adds a different capability.  For example, every monitoring system requires a power supply. The MIQ/PS is a power supply module and includes a 2-pole mains connection for 120 VAC power and 3 SensorNet terminals (see figure below). Each PS module distributes up to 18 W of 24V DC power to sensors, modules, and controllers throughout the network. Up to 6 PS modules can be located in any single network providing up to 108 W of power.  

Many monitoring systems also include analog outputs to connect the monitoring system to external equipment. The analog output modules, MIQ/CR3, MIQ/C6, MIQ/R6 provide up to 6 current outputs or relays to link with a sensor for recording values on SCADA or controlling chemical feed equipment or blowers. Up to 48 output channels (8 output modules) are possible on any network. For example, a stack of three MIQ/C6 modules may be placed inside a panel to provide 18 x 4-20 mA outputs in proximity to the PLC. Alternatively, the MIQ/2-MOD and MIQ/2-PR modules allow the monitoring system to communicate with SCADA using digital bus technology in place of analog outputs.


A junction box (MIQ/JB) is a passive module for adding SensorNet connections. An unlimited number of junction box modules (MIQ/JB) can be added to provide an inexpensive and convenient means of adding measuring locations or system branch points through 4 SensorNet terminals. Competitive systems include expensive integrated controller/modules that must be located at every monitoring location. An example configuration would include a stack of two MIQ/JB modules to provide 6 terminals for sensors and 2 terminals to connect the measuring location into the middle of a network.

The IQ SensorNet modules make system expansion simple and inexpensive. A WRRF buys the capabilities they need or can afford today.  Modules are added to the system to expand or upgrade the system in the future.

Rob Smith, YSI, supplied information for this post. Rob can be contacted at



Additional Blog Posts of Interest:

Can Smart Devices Enhance Water Resource Recovery Facilities?

Water Resource Recovery Facility Saves Time, Reduces Costs and Optimizes Process

Wastewater Aeration Control - Energy Costs Savings Examples

What's Next for Water Quality Sensor Trends in Wastewater?

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