March 2016 - Redkoh releases 3 phase 50 Hz controls to the Indian Market

Redkoh and Ador released a 3 phase SCR based TR controller on two Indian projects. The equipment for the first project was installed commissioned and has been deemed to be operating well and achieving the desired performance results.

The PreciCon 3R as it is known uses a 3 phase mains supply along with 3 banks of inverse parallel SCRs and feed a 3 phase TR set mounted at the precipitator.

The resulting precipitator waveform is a relatively low ripple voltage and has the benefit of drawing more current that its conventional single phase unit for the same peak applied voltage

The second project will be a hybrid precipitator with the 3 phase SCR controllers and TR sets fitted in the latter fields of a precipitator with high frequency switch mode units powering the earlier fields. This ensures the back fields, which will run at significantly greater power levels, will not suffer from the reliability issues often see with the higher power SMPS units.

January 2016 - Redkoh’s rapper controls find new service

The Team at Southern Field have taken a Redkoh impact rapper control and along with some small alterations, made it suitable for adapting to SCR units placed ahead of the precipitators. The control unit powers impact rappers and service to minimize damage caused by earlier types of controls on these units.

September 2015 - Redkoh Supplies Purpose Designed Electrode to US Power Plant

Redkoh along with its Electrode principal, GEECOM, from South Africa have designed and supplied a novel electrode for use at a major US power plant. The electrode is a spiral wire, but rather than a round cross section the electrode has a square cross section. Added to this, the ends of the electrodes have purpose designed shrouds that allow them to pass by the plate stiffeners and straighteners without creating a clearance problem.

The electrode is performing well with higher voltages, due to better clearances, and currents are up due to both the additional voltage and the novel cross section of the electrode.

July 2015 Reinhold Environmental Announces Lifetime Achievement Award Winner Paul Ford

ATLANTA, GA – Paul Ford, President, Redkoh Industries, was honored Monday with the presentation of The Round Table Lifetime Achievement Award.


An award ceremony was held during The 22nd Annual APC Round Table and Expo in Atlanta, GA on July 13, 2015.


The Round Table Lifetime Achievement Award is presented annually to the person who over their lifetime has made special contributions to Air Pollution Control Equipment Technology.


Paul Ford is the President of Redkoh Industries, a global leader in developing ESP controls since 1984. Located in Hillsborough, NJ, Redkoh has pioneered innovative technology and manufactured groundbreaking products for customers all over the world.


For more information about The Round Table Lifetime Achievement Awards, please visit

December 2012: Redkoh is Awarded ESP Controls Patent


To be truly effective, an electrostatic precipitator must be energized to hold a precise and consistent amount of electrical charge. Thus, electrostatic precipitators require precise and efficient power supplies to apply the proper potential to the precipitator. Conventional power supplies for electrostatic precipitators are often inefficient. Furthermore, many systems that may enable the supply of power at a relatively high frequency range are costly to implement and are incompatible with existing electrostatic precipitator systems.

It is important to have a device that is compatible with existing hardware.

Redkoh’s technology includes methods and apparatus to convert and control power provided to the electrostatic precipitator.

The Redkoh control is able to receive an (SCR) signal from a control device, and generate a demand signal, converting a first power signal from a first base frequency to a second power signal at a second base frequency.

The precipitator power frequency converter system includes an insulated-gate bipolar transistor (“IGBT”) system, a converter control system that includes a microprocessor in communication with the IGBT system, and is then able to drive either a conventional TR or a specifically designed High Frequency TR at a frequency of choice.

During the testing phase and subsequent period, all customers using the technology have gone on to upgrade their systems using solutions provided by Redkoh.
December 2012: Redkoh Industries, Inc. and Geecom LTD of Gauteng, South Africa Signed an Agreement for Distribution of Redkoh High Frequency Power Supply

Redkoh’s High Frequency power supply is rapidly gaining movement in markets outside of North America and in South Africa this is no exception.

Geecom have tested equipment on Precipitators for ESKOM and Sappi and are building there next ESP for Impala Platinum mines in Rustenburg using Redkoh High Frequency technology.
November 2012: Redkoh Industries, Inc. and Geecom Ltd of Gauteng, South Africa Signed an Agreement For Distribution Of The Gspike Discharge Electrode for Use in The North American Market

The collector efficiency of an ESP is directly related to the applied corona power. However, this corona power needs to be applied effectively in order to impart the largest benefit possible at the actual point of corona discharge which emanates from an element referred to as a discharge electrode.

Discharge electrodes have evolved quite undramatically over the years and it is still quite common today to be faced with ESPs equipped with such elements which were designed and installed over 30 years ago. However, new demands for higher efficiencies coupled with corresponding lower maintenance costs, have led to some manufacturers favoring technologies and applications more suitable for today’s general usage. This implies looking into models which consider not only updated technology aspects but also manufacturing process, reliability in the long term as well as easy installation in order to effect cost effective replacements.

Rigid Discharge Electrode (RDE) technology has been utilized extensively in Europe and North America and it has been found that the electrical characteristics of such electrodes have contributed significantly to an improvement in the efficiency of many ESPs. Furthermore, because of greater flexibility in geometry and configuration of the electrode units, RDE technology allows for such improvements as increases in Specific Collection Area (SCA), aspect ratio, migration velocity and treatment time.

The patented G-SpikeTM RDE shows a definite improvement in corona current over other RDEs presently on the market which varies between 12.5% at 15kV and 47.4% at 45 kV. This variance is attributed not only to the configuration of the mast but also to the high level of aggressiveness of the corona generator (spike) and its matching compatibility to the geometry of the collector electrode plates. This compatibility is also of the utmost importance in order to ensure maximum uniformity of current discharge and a substantial decrease in the occurrence of “cold spots” where corona current flow is minimal.

Compatibility is assured not only by the position of the corona generator (spike) at mast intervals suitable to the ESP configuration but also to its specific width as well as the explicit curvature of the 4 tines at each end.
June 2011: Redkoh Industries Announces the Release of a New Smart Phone App for Troubleshooting Electrostatic Precipitator Electrical and Mechanical Problems

This App can be obtained by searching “Redkoh” on your IPhone, Blackberry, or Android phone. Read more.
Early in 2010, Philkoh Opened its Doors with the Support of Redkoh Industries

In just a few short months, the company announces that it has doubled its manufacturing floor space and manpower to accommodate larger electrical control panels and more complicated pneumatic closed loop feedback systems.
Phil Blockus, Philkoh’s manager reports that if growth continues at the present rate he will need to expand further in order to accommodate his increasing workload and rapid turn-around of both engineering and manufacturing. Read more.
June 2009: Redkoh's Patent Pending Interface Allowing 3rd Party SCR Type AVC's to Control a 400 Mid Frequency Power Supply is to be Released at This Year's Reinhold Show at the Woodlands in Texas.

Redkoh's Patent Pending Interface allowing 3rd Party SCR type AVC's to control a 400 Mid Frequency Power Supply is to be released at this Year's Reinhold Show at the Woodlands in Texas. Read more.
Redkoh Industries is Proud to Announce as of April 2009 All Manufacturing Facilities Are UL Certified

Underwriters Laboratories® is an independent product safety certification organization that has been testing products and writing standards for safety for more than a century. UL is the trusted resource across the globe for product safety certification and compliance solutions and has developed more than 1,000 Standards for Safety to help ensure public safety and confidence, reduce costs, and improve quality.

We at Redkoh are proud of our acceptance by UL. It proves our commitment to providing safe and high quality products to our customers, as well as proof of our desire to continue to improve the quality of our products in the years ahead.

March 2009: Redkoh's Latest Precipitator Control System Receives CE Certification of Compliance
March 2009: Redkoh's latest precipitator control system receives CE certification of compliance. Read more.