Airless SCR Architecture & Diesel Aftertreatment Technology
Engineered for performance, simplicity, and compliance, the E.I. Williams/IMS Airless SCR system uses a compressor-free DEF dosing architecture to reduce complexity, extend service intervals, and achieve Tier 4 Final emissions standards across a variety of diesel and gas generator applications.
What is an Airless
SCR System?
No Compressor Required: Dosing is achieved using DEF pressure and precision injector nozzles, eliminating pneumatic components
Integrated Sensors: Continuous monitoring of NOx, temperature, pressure and flow
Active Logic Control: DEF injection governed by pre-calibrated algorithm
How Airless Compares to Standard SCR Systems
See how E.I. Williams/IMS’ compressor-free design simplifies installation and reduces failure risks.
Why Eliminate Compressed Air?
System Design & Integration
Mounting Flexibility
– Frame, skid, or container-integrated
– Low-backpressure SCR body + silencers
DEF Dosing System
– Heated lines and freeze-protected options
– Buffer or direct injection mode
Control Module
– Factory prewired, touchscreen or SCADA-ready
– CANbus / Modbus / RS485 options
Mounting Flexibility
– Frame, skid, or container-integrated
– Low-backpressure SCR body + silencers
Monitoring, Service & Diagnostics
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