
MAC155 Moisture Analyzer
- Built-in 2-Point Daily Calibration
- Fast 60-Second Response Time
- Up to 2400°F Temperature Capability


NIST-Traceable Measurement
US EPA Compliant
NEMA 4X Rated
Stack moisture monitoring systems engineered for steel plants and heavy industrial applications. MAC Instruments' moisture analyzers deliver continuous, real-time humidity measurement in extreme exhaust gas temperatures up to 1200°F standard (2400°F optional). Our patented solid-state technology eliminates wet bulbs, optics, and compressed air requirements while providing EPA-compliant emission monitoring. Built for 24/7 operation in harsh environments with NEMA 4X weatherproof construction.


What temperature range can these stack moisture analyzers measure?
Standard models measure up to 1200°F, with optional configurations available for ultra-high temperatures up to 2400°F, making them ideal for steel plant exhaust stacks and furnaces.
How do these systems comply with EPA emission monitoring requirements?
What makes the MAC155 different from the MAC125 moisture analyzer?
Can these analyzers be installed outdoors in harsh environments?
What maintenance is required for stack moisture monitoring systems?
How quickly do these analyzers respond to moisture changes?
What industries besides steel plants use these moisture analyzers?
Talk to our experts for custom solutions and tailored guidance.

Continuous stack moisture monitoring for annealing furnaces, heat treatment ovens, and exhaust stacks with temperature capability up to 2400°F.

EPA-compliant moisture measurement for coal, biomass, and natural gas boiler exhaust stacks and HRSG systems in combined cycle plants.

High-temperature humidity control for cement kilns, clinker coolers, and raw mill exhaust with altitude-compensated measurement accuracy.

Recovery boiler and dryer section moisture analysis for process optimization and emission compliance in paper manufacturing facilities.
Talk to our experts for custom solutions and tailored guidance.



Patented solid-state sensors measure moisture in exhaust gases up to 2400°F without wet bulbs, optics, or compressed air. Proven reliability in the harshest steel plant environments with NIST-traceable accuracy.
Built-in calibration systems and regulatory-compliant design ensure accurate emission monitoring for stack gas compliance. Automatic altitude compensation and precise analog outputs meet strict environmental standards.
World leader in high-temperature moisture measurement since 1990. NEMA 4X weatherproof construction, global distributor support, and field calibration services ensure continuous 24/7 operation in demanding industrial applications.
Request a quote and our technical team will respond within 24 hours with application-specific recommendations, sizing guidance, and pricing for your steel plant monitoring needs.
For immediate assistance, feel free to give us a direct call at 419.621.2322 You can also send us a quick email at info@macinstruments.com
For immediate assistance, feel free to give us a direct call at 419.621.2322 You can also send us a quick email at info@macinstruments.com