Mac 125 Moisture Analyzer
MAC155 Moisture Analyzer
MAC 116 Steam Analyzer
NIST-Traceable Measurement certified

NIST-Traceable Measurement

NEMA 4X Rated certified

NEMA 4X Rated

Humidity Sensors 4-20mA Output for HVAC Systems

Industrial-grade humidity sensors with 4-20mA output designed for HVAC systems and high-temperature process monitoring. MAC Instruments' moisture analyzers deliver precise humidity measurement from 40°F to 1200°F using patented solid-state technology. NEMA 4X/IP66 rated enclosures withstand harsh environments while providing continuous, accurate readings for process control and regulatory compliance across power generation, manufacturing, and food processing applications.

Our Range of Products

Mac 125 Moisture Analyzer

Mac 125 Moisture Analyzer

  • Measures to 1200°F (650°C)
  • NEMA 4X waterproof design
  • No chemicals or compressed air
MAC155 Moisture Analyzer

MAC155 Moisture Analyzer

  • Built-in 2-point calibration
  • 60-second response time
  • EPA compliant for emissions
MAC 116 Steam Analyzer

MAC 116 Steam Analyzer

  • IP66 sanitary construction
  • 24V DC safe power supply
  • CIP operation compatible

Frequently Asked Questions

What is the measurement range for MAC Instruments humidity sensors with 4-20mA output?

Measurement ranges vary by model: MAC155 offers 3-15%, 6-30%, 9-45%, or 12-60% water vapor by volume. MAC125 measures absolute humidity to virtually any temperature.

How do these humidity sensors work in high-temperature applications?

What is the response time of these humidity sensors?

Are these humidity sensors suitable for outdoor installation?

How often do these sensors require calibration?

What power supply options are available for these 4-20mA humidity sensors?

Can these sensors be used for EPA emission monitoring compliance?

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

Industries We Serve

Power Generation

Power Generation

Continuous stack gas monitoring for coal, biofuel, and natural gas operations with EPA-compliant humidity measurement.

Cement Manufacturing

Cement Manufacturing

High-temperature moisture control in kilns, calciners, and dryers for optimal production efficiency and product quality.

Food Processing

Food Processing

Sanitary steam quality monitoring for cooking, drying, and pasteurizing with IP66-rated sensors and CIP compatibility.

Metal Processing

Metal Processing

Process humidity control for furnaces and heat treatment operations requiring extreme temperature measurement capability.

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

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Why Industrial Process Engineers Choose MAC Instruments

Patented High-Temperature Technology

Our proprietary solid-state sensors measure humidity up to 1200°F without chemicals, wet bulbs, or compressed air—delivering unmatched accuracy in extreme industrial environments.

Built-In Calibration Systems

Daily 2-point in-situ calibration ensures measurement integrity without process interruption. Field-proven technology maintains ±1% accuracy throughout harsh operating conditions.

Severe-Duty Industrial Construction

NEMA 4X/IP66 rated stainless steel and cast aluminum enclosures withstand outdoor installation, chemical exposure, and continuous operation in the world's toughest industrial processes.

Get Expert Guidance on Humidity Sensing Solutions for Your Process

Our application engineers will help you select the right humidity sensor configuration for your HVAC or industrial process requirements. Expect a response within one business day.

Contact Us Today

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