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Electrical Controls

Electrical Control Systems for Air and Gas Handling Systems

Control technology is one of our core competencies, a major Engineering Edge for Spencer. Our System Design & Control Engineering Department has its own electrical, application and design engineers whose professional responsibility is to apply advanced control concepts to client projects. They are also skilled at software programming for our equipment and integrating our controls with your central SCADA systems, working with your engineers or consultants.


Programming of control software at Spencer is performed by engineers familiar with efficient sequencing of air and gas handling systems.

We create 100% of our control systems in-house. From simple installations of single and multistage blowers up to complex systems, our application-tailored control systems can help your Spencer equipment operate at peak productivity and cost-effectiveness. When you order everything from Spencer, your control panel will be shipped with the total equipment package, prewired if needed and ready for on-site hookup. We accept responsibility for satisfactory on-the-job operation of all system elements that we supply.


Set points being established for bypass operation and system sequencing of multiple gas boosters. Load monitoring function automatically starts a backup machine when the lead machine approaches full load.

Spencer controls can include alarm and shutdown capabilities if a machine or process cannot be maintained within established parameters. Optional safety features such as vibration, bearing temperature and low flow monitors can alert personnel to dangerous situations such as material accumulation, heat buildup, low bearing lubricant or a gas flow obstruction. For vacuum systems, you can be notified of dirty or broken filters and full collectors. Controls can also operate various types of material discharge devices.


Spencer electrical engineer conducts onsite control training during system startup.

Other available features include UL and CUL Listed control panels along with NEMA enclosures 1, 3R, 4, 4X, 7, 9 and 12. Purged panels may also be specified for NFPA compliance in hazardous locations.

Aeration Control Systems

Another area of Spencer control specialization is for aeration systems in water and wastewater treatment processes at industries and municipalities. Even if you are not involved in this field, our comprehensive contributions here demonstrate the depth and breadth of Spencer expertise that can be applied to any control issue you have.

Spencer aeration air delivery systems save time and money through intelligent equipment selection and process management. This is a Big Picture approach that addresses the total system needs, from energy-efficient blowers to dissolved oxygen controls to proprietary control logic that manages all the aeration processes. And again, we accept single vendor process responsibility for everything we supply.

Following are some of the Spencer control-related assets for wastewater aeration.

  • Blower & motor protection panels

–Bearing temperature and blower vibration monitors

–Oil level monitoring systems

–Motor phase protection and stator winding RTDs

(Resistance Temperature Detectors)

–Motor overload and surge protection

  • Motor control centers 

–Comprehensive, customized motor control


–Efficient modular design integrates VFDs and

MCC circuitry

–Factory assembly and testing avoids field


  • Dissolved oxygen control systems

–DO probes, oxygen analyzers, flowmeters,

motorized basin valves (MBVs)

–Provides input for sophisticated, fine-tuned air


  • Aeration system engineering

–Coordinated services of process, electrical and

mechanical engineers

–On-staff Spencer experts in wastewater treatment

and aeration

–Programming specialists for airflow control logic

  • Electrical controls design expertise

–UL/CUL Listed control panels with PLCs and

operator interfaces

–SCADA system tie-ins

–Flow and pressure transmission systems

Click here to request further information or assistance from a Spencer aeration specialist.

Typical Spencer Control System for Wastewater Aeration

  • VFDs with circuit breakers, interface keypads, rpm meters and remote I/O devices
  • Blower protection panel for surge and overload protection and bearing temperature monitoring
  • DO control system to govern dissolved oxygen levels in basins using DO transmitters, modulating valves and VFDs
  • Modem link to Spencer factory for troubleshooting and software revisions
  • Blower lead-lag-standby control and DO control via PLC logic programmed by Spencer


Wastewater treatment basin with dissolved oxygen sensor, part of the DO control system governing oxygen levels in basins using DO transmitters, modulating valves and VFDs.


Municipal wastewater treatment facility uses Spencer Power Mizer blowers, stainless steel piping and controls for high efficiency management of dissolved oxygen in activated sludge lagoons. Instrumentation includes programmable logic controller, modem communication software, DO control system and interface keypads.

Let Spencer Put You in Controls

When Spencer provides both your air or gas moving equipment and its controls, you know everything was made to work together well. You get greater reliability and more efficient system performance. And older Spencer systems can take on greater capability by means of retrofit control packages. Increased operating efficiency often delivers a payback of your update investment in three to five years. That’s another aspect of the Engineering Edge you get from Spencer.


Custom, mobile vacuum cleaning system removes mercury vapor spills using Spencer control panel to run an on-board air compressor and Vortex vacuum producer, and to govern periodic, automated blow-down cleaning of filters in a Jet-Clean® cartridge separator.


Sophisticated control system travels with this skid-mounted, crane-positioned Spencer vacuum system for shipyard recovery of highly abrasive shot blast media, rust and scale.


Trio of wall-mounted Spencer control cabinets govern a series of centrifugal blowers in the isolated adjoining room.