SCR/DPF Solutions

MIRATECH provides cost-effective, reliable, mission-critical emission and acoustical solutions for stationary natural gas and diesel reciprocating engines. Miratech caters solutions to both small (HP < 300) and large stationary engine applications (up to 14,000 horsepower). MIRATECH offers a comprehensive range of catalysts, housings, silencers, monitoring systems and related services that address and reduce engine-exhaust pollutants such as NOx, CO, VOC, diesel particulate, HAPs, and noise. Along with high-quality products, their engineering team provides each customer with solutions specific to their emission-control requirements and installation-configuration challenges.



The AT-IV Active system is a unique product designed for diesel engine gensets in the range of 1,000 kW to 4 MW employed in mission critical installations such as hospitals, data centers, financial institutions, and drilling rigs, or for engines operating in extreme temperature applications.

The AT-IV system’s single housing assembly is modular and can be assembled in multiple configurations. It also comes complete with mounting brackets that offer extreme flexibility to meet particular installation needs. Plus, there is no need for forced inducement strategies and it offers integrated sound reductions up to 25 dB(A).

The AT-IV may be retrofitted to existing engine applications and will control pollutants (NOx, CO, VOC and PM) to permitted levels.

AT IV Active system

The new MIRATECH AT-IV active Diesel Particulate Filter (DPF), DOC, and SCR system is the next advancement in pollution control. It is a truly revolutionary concept that combines the leading technology from MIRATECH® and RYPOS in a single housing.

AT-IV Brochure


Compact, Integrated SCR For Natural Gas And Diesel Engines

Designed to offer and integrated pre-packaged solution.

  • Compact design fits on generator enclosures or inside engine rooms.
  • Flexible inlet/outlet locations to simplify pipe routing.
  • For diesel applications, can comply with Tier 4 Final or better emission requirements. Can reduce NOx, CO, VOC, CH2O and PM10 emissions.
  • Integrates proven passive LTR™ low-temperature regeneration DPF (500°F regen).
  • For natural gas applications, can be supplied as SCR or SCR/Oxidation integrated critical-grade silencing. Can reduce NOx, CO, VOC and CH2O emissions.
  • Can be supplied as SCR-only or DPF-only—additional catalysts may be added later in order to meet future requirements.
  • Integrated silencing.


Integrated Technologies In A Single-Housing Assembly

The MIRA-CUBE builds on proven MIRATECH technologies and offers stationary engine owners/operators a more compact packaging option. For diesel engines, the MIRA-CUBE can contain LTR™ low-temperature regeneration DPF, diesel oxidation catalyst and SCR. Natural gas engine versions can contain MIRATECH BEAST oxidation catalysts and SCR. Any version can be supplied SCR-ready with DPF and/or oxidation catalyst installed, ready for simply adding SCR catalyst and controls later.

Everything is assembled into a compact, integrated package. The MIRA-CUBE is designed for diesel or natural gas engines from 1000 to 4000 kw. The MIRA-CUBE is your solution for a combined, pre-packed, single-housing system.

Easy Installation And Built-In Sound Attenuation

The MIRA-CUBE system comes complete with mounting rails suitable for supporting from below or suspending from overhead. Inlet and outlet location flexibility means the system can be tailored to fit your installation constraints. The system provides critical-grade silencing with higher levels of attenuation available.

Retrofit Ready

The MIRA-CUBE’s compact size makes it ideal for retrofits of existing engines. Paired with a reactant tank system (The MIRA-POD) that combines a urea tank and all control/dosing equipment into one housing, retrofits are easier than ever.

Full Support, Close To Home

Technical services and training provided by MIRATECH, along with field service from authorized MIRATECH representatives, ensures prompt, reliable product support that is just a phone call away anywhere in the world.

Need Emissions And Acoustic Solutions? Contact MIRATECH.

For over 27 years, MIRATECH has been at the forefront in helping industries handle emissions and acoustic standards. Whatever your emissions needs may be, count on us for solutions. Contact us today!


Tier V Systems

  • Net Environmental Benefit: Further reduces Tier 4 criteria pollutants and reduces Air Toxics and Global Warming Potential (GWP) emissions.
  • Operational Flexibility: Maximize engine run hours within a given emissions cap with real-time NOx monitoring.
  • Cost Effective: Keep using proven diesel generators instead of more costly options perceived as ‘cleaner’ that offer the same or worse NEB.
  • Health Effects: Decreased PM and ozone precursors translate to lower risk of respiratory illnesses.
  • Compliance Assurance: Real-time monitoring and data logging of temperature, pressure, dosing rate, and NOx values.
  • Cleanest Option: Tier V equipped diesel engines set the standard for lowest achievable emissions typically resulting in a Generator vs. Utility (GVU) Analysis favoring the Tier V equipped generator.
  • Unmatched Technical Support: Detailed GVU report, system commissioning and field service, and real-time system health monitoring. Ask us for a GVU Analysis customized to show pollution levels from a Tier V MIRATECH-equipped engine versus your local Utility.


Hardware: MIRA-CUBE + ACIS-3 With NOx Sensors
  • Low Profile, Compact, and Integrated Packaging
  • Oxidation Catalyst with Unmatched Air Toxics Reductions
  • Either a Low-Temp Regen Passive DPF or an Active DPF Providing Lower PM Emissions than Typical Natural Gas Engines
  • SCR Catalyst for Ultra-Low NOx Emissions and Reduced GWP Emissions
  • Closed-Loop SCR Controller with Intuitive Interface for Ease of Use


Software: Remote Monitoring Platform
  • Compliance Assurance using Real-Time Monitoring and Datalogging
  • Marrying All Sensors & Calibrations to Compliance Tests
  • Customized Service Intervals Available Based upon Monitoring Results
  • Subscription Plans with Alert Notifications, Reporting, & Online Service Requests


Need Emissions And Acoustic Solutions? Contact MIRATECH

For over 27 years, MIRATECH has been at the forefront in helping industries handle emissions and acoustic standards. Whatever your emissions needs may be, count on us for solutions.

Full Support, Close To Home

Technical services and training provided by MIRATECH and MIRATECH-authorized representatives ensure prompt, expert product support is just a phone call away. Support is available worldwide in the Americas, Europe and Asia.

The MIRATECH® Tier V System Brochure



Where NOx control is a challenge, MIRATECH delivers the best SCR system, service, and product support. The MIRATECH SCR systems work in two efficient stages: the NOx Reduction Stage and the Oxidation Stage for CO and HC reduction. Both stages work together, drastically reducing harmful emissions to satisfy the strictest regulatory requirements.

The new NR housing is designed for the NOx Reduction Stage and houses the SCR catalyst. This is where the exhaust that has been injected with ammonia (whether injected directly or formed from urea) reacts with NOx to form harmless water and nitrogen.

Its carbon steel housing has flanged inlet and outlet connections, so that it can be easily bolted into the engine exhaust system. Lifting lugs and mounting feet are also provided for ease of installation. Two access door is provided for loading the filter blocks, and an additional access door and ports are provided for filter cleaning. Instrumentation ports are installed on the inlet and outlet for monitoring the pressure and temperature differentials across the filter.

  • Energy Infrastructure
  • Power Generation
  • Air Compression
  • Liquids Pumping
  • Bio-Gas
  • Greenhouse CO2 Enrichment


  • NOx
  • NO2

SCR Brochure


The CARB Level 3 Plus Verified (California Air Resources Board) LTR system is developed for maximum reduction of engine exhaust emissions from emergency backup and prime power generator units. The LTR’s oxidation catalyst (DOC) is built into the front of the filter housing which treats the exhaust before it enters the diesel particulate filter (DPF). This system design addresses pollutants such as carbon monoxide (CO), unburned hydrocarbon (HC), volatile organic compounds (VOC), and particulate matter (PM).

Plus, it is designed to remove over 85% (and can achieve up to 97% removal) of particulate matter (PM or soot) from stationary diesel engine exhaust with regeneration temperature requirements as low as 500°F/260°C. The captured particulate matter is burned off passively through catalytic oxidation energized by the exhaust temperature. (No additional heat input to the exhaust gases is required.) Therefore, for most engines, soot regeneration can start at an engine load as low as 30% (at 500°F / 260°C) with properly insulated exhaust piping.

The DOC is made of proven VORTEX™ substrate and is coated with precious metals to promote specific oxidation reactions to convert:

  • CO to CO2
  • Unburned Hydrocarbons to CO2 and H2O (Water)
  • Some NO will be converted to NO2, to support the regeneration process in the DPF module.

The DPF module is made of multiple DPF blocks consisting of porous Mullite substrate. It will capture the particulate matter with a filtration efficiency of 85% or better. Once the PM is captured, it can be catalytically oxidized with the support of NO2 for the oxidation process.

In addition, MIRATECH’s DPF Data Logger kit comes with all the proper components to monitor the temperature and back pressure at the inlet of the LTR housing. Each kit contains: (1) Controller, (1) Display, (1) Pressure Gauge Assembly, (1) Moisture Separator, (1) Fuse Kit and (1) Wiring Harness. This monitoring system provides warnings when the exhaust-gas back pressure in exhaust systems reaches excessively high levels, as can happen when a filter becomes clogged with diesel soot. If the monitoring system detects too high of a back pressure level, or severe damage to the filter, it first provides a visual alarm for the user by means of illuminated display lamps, and then generates an audible alarm.

The LTR system is designed to accommodate engines sized from 100 kW to 4 MW and can be fitted on Tier 1, 2, or 3 engines with certified PM emissions that are less than 0.3 g/bkW-hr.

It comes standard with a carbon steel housing with high temperature black paint and is also available in 304SS. Plus, the LTR system provides Critical grade noise reduction, eliminating the need for a separate silencer in most applications. In addition it is engineered for easy installation and service. Its compact profile allows for installation flexibility especially since it can replace a separate silencer.”

With proper engine control and maintenance practices, the LTR will provide years of trouble free emissions abatement.

  • Power Generation
  • Air Compression
  • Liquids Pumping


  • CO
  • HAP’s
  • Particulate Matter (PM)

LTR Brochure

SCR Brochure

Diesel Particular Filter

Our passive DPF technology uses porous, wall-flow ceramic filters, shown to be thermally and mechanically durable in engine operation. The filters are assembled in modular arrays within MIRATECH’s LTR and MIRA-CUBE housing lines. These modular DPF filters are stackable, to tailor particulate matter reduction capacity to an engine’s specific needs. MIRATECH’s filter construction also affords much greater particulate trapping and “storage” capacity than other filters. Filter regeneration temperatures and back pressures are low and stay well within OEM limits.

Coated with a sulfur-resistant catalyst to reduce the temperature required for particulate oxidation, MIRATECH’s DPF filters allow PM burn-off or “passive regeneration” using engine exhaust heat at temperatures as low as 500°F/260°C, depending on the engine’s particulate production. Unlike some soot filters, MIRATECH’s design limits NO₂ production, which means no worries over regulated by-products.

  • Rail
  • Power Generation
  • Air Compression
  • Liquids Pumping
  • Industrial Marine


  • CO
  • HAP’s
  • Particulate Matter (PM)

LTR Brochure

Catalyst Formulations Brochure

Custom Solutions

Your application may require a custom emissions solution. MIRATECH can help.

Our experience and emissions and acoustics solutions have been tried and tested with all types of engines in many different applications. MIRATECH’s strength is in designing and delivering quality solutions for complex emissions challenges. If there’s a problem, or a potential problem, we have probably already solved it. If a new emissions issue arises, no one will get to the bottom of it faster than MIRATECH.

Our emissions solutions have included:

  • Custom catalyst housings
  • Custom catalyst element sizes and formulations
  • Novel noise-solution options
  • Control systems with data acquisition and communications
  • Project management
  • Personnel training
  • Financing options

Control & Monitoring

SCR Control

A New Level Of Sophistication

The MIRATECH ACIS-BLU SCR control and dosing system brings a new level of sophistication and simplicity to gas and diesel engines in the 300-1500 kW power range. The ACIS-BLU is available in an open loop configuration to meet less stringent NOx control or monitoring needs, as well as NOx sensor-based closed-loop configuration to meet lower NOx targets along with low ammonia slip levels. Robust monitoring and data logging provide the user with operating data to demonstrate compliance assurance. Logs are easily exported to a USB stick in CSV format. Settings and parameters can easily be saved and imported, making set-up for multiple units much faster. The ACIS-BLU control and dosing system can be utilized on nearly every combination of MIRATECH SCR solutions, including SCR-only, SCR and oxidation, or SCR and DPF (diesel only).

Compact, Simplified, High-Performance

The ACIS-BLU dosing system utilizes high-pressure, airless urea injection. This provides extremely fine urea atomization resulting in shorter mixing sections, along with eliminating the air compressor common in most stationary systems. That’s one less component to install and maintain. Compact urea pump and injector require a minimum amount of space, making retrofits or new installation easier to design and install.

Main Features

  • High-pressure airless urea injection provides ultra-fine atomization along with fewer components
  • Pre-fabricated outdoor-rated wiring harness with quick connects at components simplify installation
  • Quick-connect fittings on pump and injector makes installation and maintenance easier
  • Available inlet and outlet NOx/O2 sensors for closed-loop control and system monitoring
  • Available differential pressure, inlet temperatures and urea tank level monitoring/display
  • Available dual dosing configuration supporting an additional reactant pump and injector to solve challenging packaging constraints on twin turbo charged engines

Intuitive User Interface

  • Similar to smart phone OS
  • Simplifies operator/technician training
  • Supports multiple languages
  • Logs critical operating parameters; log files are easily exported



ACIS-3 (Closed-Loop Control with NOx Sensors)

The ACIS-3 Closed-Loop Control system utilizes NOx sensors for pre-SCR and post-SCR NOx values, which it then uses to adjust urea injection to constantly achieve a specific NOx target. It continuously monitors urea injection rate and compares to the desired rate and adjusts accordingly. NOx targets of 25 ppm or greater, concurrent with low ammonia slip, can be maintained with the ACIS-3 control system.

Operator interface is via a powerful yet simple HMI with graphical representation of the entire emission system. An operator can see at a glance critical operating information such as temperatures, NOx measurements, injection rate, exhaust pressure, etc.

ACIS-II (Closed-Loop Control with Electrochemical Analyzer)

The ACIS-II Closed-Loop Control system has an on-board measurement of post-SCR NOx values, which it then uses to adjust urea injection to constantly achieve a specific NOx target. NOx targets of 5 ppm or lower, with concurrent low ammonia slip, can be maintained with the ACIS-II control system.

Like the ACIS-3, the ACIS-II has a powerful HMI which makes monitoring and setting up the system simple.

The Mira-Monitor, For Temperature And Pressure Measurement And Data Logging

The reliable, cost-effective MIRA-MONITOR provides users with a Continuous Parametric Monitoring System (CPMS) and helps gas and diesel engine users meet RICE NESHAP requirements by providing complete catalyst monitoring for total control over regulation compliance.

Federal regulations adopted by U.S. EPA on March 3, 2010 require many owners and operators of large engines to comply with a standard known as the RICE NESHAP Rule. The RICE NESHAP rule compliance date for diesel (CI – compression ignition) engines was May 3, 2013, and gas (SI – spark ignited) engines was October 19, 2013. Regulations include work practices and catalyst monitoring.

The MIRATECH MIRA-MONITOR includes the equipment needed to monitor and record inlet temperature and differential pressure to comply with NESHAP CPMS requirements. Users can configure and extract logged data using the included software to provide credible evidence of continuous compliance.

The MIRA-MONITOR logs catalyst inlet temperature and differential pressure samples every minute. The MIRA-MONITOR starts recording data when the differential pressure is greater than 1″ of water column. The logger stops recording data when the differential pressure drops below 1″ of water column. Optionally, logging can be triggered with an engine run signal. Two red lamps on the front of the MIRA-MONITOR indicate if there is high exhaust temperature or high differential pressure.

The easy-to-use controls allow the user to manually start or stop logging and step through the operating parameters. When it’s time to download the log files, the user can easily connect to the logger with a laptop or desk top computer and an ethernet cable or remove the compact flash card and download the log file with a card reader.



MIRATECH’s newest offering, MIRATECH Remote, is a continuous equipment monitoring system. Here are some of the benefits and features of MIRATECH Remote:

  • Continuous equipment monitoring 24/7/365
  • Access to equipment status and performance through the MIRATECH Remote website
  • Plug and play installation with fully preconfigured settings
  • Cloud storage with local buffering
  • Internet connectivity via cellular, ethernet, or Wi-Fi
  • Email and text message notifications available
  • A minimum of one-year data retention with expansion options
  • Eight assets can be monitored with only a single gateway
  • Customizable graphs show equipment performance
  • Capability to add non-MIRATECH equipment to monitoring platform.


Introducing MIRATECH Remote

MIRATECH Remote is a continuous equipment monitoring system that provides access to equipment status and performance through the MIRATECH Remote platform. Needing only a cellular, ethernet or WI-FI connection, MIRATECH Remote is plug and play with notifications and access available from any desktop, tablet or mobile device.


DPF Monitor

MIRATECH’s Differential Pressure and Temperature Monitor & Data-Logging (Diesel Particulate Filter (DPF) monitor) system provides warnings when the exhaust-gas pressure reaches high levels, as can happen when a filter becomes clogged with diesel soot or ash. If the monitoring system detects back pressure levels which are too high, it first of all provides a visual alarm for the user by means of illuminated display lamps, and then generates a further audible alarm.

In addition, the DPF Monitor measures the temperature of exhaust entering the DPF, displaying and logging that information.

If desired, actual pressure and temperature values can be shown on the display. The pressure and temperature are continuously written to memory. When an alarm is generated, it remains activated until the relevant values return to normal levels. The audible alarm is switched off when the alarm is acknowledged.

Pressure is measured in the range between 0 and 600 mbar (0 – 240 inches water). Temperatures in the range between 50 °C and 1,050 °C (120 °F – 1920°F) can be displayed.

The operator can ascertain by means of the temperature display whether the exhaust-system temperature is within the optimum range for the filter. If a back-pressure alarm is generated, the operator can raise the temperature of the exhaust gas by increasing the engine load and thus causing the filter to clean itself. The exhaust-gas back pressure will then be reduced, and the warning light will be extinguished.

  • Power Generation
  • Air Compression
  • Liquids Pumping
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