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MAC155 Moisture Analyzer/Humidity Probe

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The MAC155 moisture/humidity analyzer is the premium instrument for high temperature humidity measurement. The MAC155 augments your process safety and complies with US EPA regulations. Several high-quality components such as a humidity probe and humidity transmitter combine to make this device exceptionally user-friendly. Used in industrial operations worldwide for 24/7 monitoring of stack emissions gases, the MAC155 is designed for monitoring of stack emission gases and for measuring humidity in exhaust gases in temperatures ranges up to 1200°F (650°C). MAC Instruments also provides a range of special accessories to expand the usability of the humidity probe in temperatures up to 2400°F (1300°C).

In addition, a defining attribute of the MAC155 humidity transmitter is a built-in calibration system. This system makes daily 2-point in-situ calibration and system checks possible and facilitates adherence to US EPA regulations and local mandates pertaining to exhaust stack installations. The humidity probe is protected from particles by a 10-micron stainless steel sintered filter element that can be easily cleaned and replaced.

The humidity probe on this unit is exceedingly sensitive to water vapor/humidity. However, it does not rely on a wet bulb, mirrors, optics, chemicals, or compressed air to provide readings. This humidity meter is highly responsive to the partial pressure of water vapor, thus displaying instantaneous readings. You can confidently depend on MAC Instruments’ patented solid-state design to help you improve overall process efficiencies in the toughest industrial settings. The MAC155 humidity transmitter is available in two models for low range and high range continuous humidity monitoring.

Special Features of the MAC155 Moisture Humidity Transmitter

  • MAC155 Humidity Analyzers is Available in Two Models:
    • MAC155-L covers 3% to 15% or 6% to 30% ranges (user-selectable)
    • MAC155-H covers 3% to 15%, 6% to 30%, 9% to 45%, or 12 % to 60% ranges (user-selectable)
  • Measure % Moisture by Volume (MBV) in Exhaust Gases at Temperatures up to 1200°F
    • Optional to 2400°F
  • NEMA 4X Waterproof Design
    • Suitable for outdoor installation
  • Contains Built-in Equipment Allowing Daily 2 Point Calibration Check
    • Floods Sensor with an internally generated reference gas of specific humidity levels
  • Re-Calibrate in the Field Using Internal Calibrator
  • System Calibration
    • Sensor signal substitution can be externally initiated to generate an output signal 50% of full output.
    • the MAC155 Controller generates 3 different output signals.
    • Provides a method of checking total system including data acquisition equipment.
  • Patented Measurement Process
  • In Situ Measurement
    • Mounts directly to stacks or ducts
  • 0-20mA or 4-20mA Signal Output User selectable Self powered or loop powered (jumper selectable)
  • Filter Blow Back Option
    • Allows automatic filter cleaning (requires 10 psi clean dry air)
  • Case Heater Option
    • Extends ambient temperature rating to -40°F

The Standard For High Temperature Humidity Measurement

  • The MAC155 In Situ Moisture Analyzer is designed to continuously monitor emission stack gases.
  • It meets EPA and local regulatory requirements for stack gas moisture/humidity measurements.
  • The patented solid-state design has been proven in hundreds of industrial process control applications.
  • The moisture sensor is extremely rugged and requires no chemicals, compressed air, optics or mirrors.
  • The % moisture by volume is measured using a proprietary high temperature capacitive sensor that responds to water vapor pressure in the presence of other gases.
  • The MAC155 Moisture Analyzer used as Humidity Transmitter is provided with automatic two-point calibration check at user -selectable humidity levels. The on board calibration system can challenge the sensor with a controlled water vapor sample. An internal tank holds enough water to generate vapor samples for one year of daily calibration checks.

Specifications

  • Measurement Range
    • (MAC155-L)
      • 3% to 15% or 6% to 30% water vapor by volume (user-selectable)
    • (MAC155-H)
      • 3% to 15%, 6% to 30%, 9% to 45%, or 12% to 60% water vapor by volume (user-selectable)
  • Maximum Stack Gas Temperature
    • 1200°F (optional to 2400°F)
  • Ambient Temperature Range
    • 30°F to 120°F (-40°F with case heater option)
  • Altitude Range
    • sea level to 6000 feet
  • Accuracy
    • ±1% of % MBV full scale
  • Linearity
    • +/-1% of % MBV full scale
  • Response Time
    • 60 seconds or less to reach 90% of final value
  • Analog Output
    • 0-20mA or 4-20mA. Internally powered
  • Power Requirements
    • 120V 60HZ @ 3A max

Calibration System

  • Calibration Check Points
    • (MAC155-L)
      • 6% and 12% or 12% and 24%
    • (MAC155-H)
      • 6% and 12% or 12% and 24% 0r 18% and 36% or 24% and 48%
  • Calibration Point Accuracy
    • +/-1% of % MBV full scale
  • Distilled Water Tank Capacity
    • 17 fl. oz. (17 oz. usable)
  • Water Usage
    • 17 oz. per year