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Howell Laboratories, Inc.

Moisture Measurement

The moisture content of a gas can be expressed by its “dew point” or “frost point” temperature; that is, the temperature to which the gas must be cooled to cause a condensation of moisture as dew (above 32° F) or frost (below 32° F).

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  • High-Pressure Dew Point Monitor & Alarm Model 7149

    $0.00

    The Model 7149 high-pressure dew point monitor and alarm system is designed to provide a simple, reliable method of measuring the dew point (moisture content) of high-pressure (up to 5000 psig) dry air systems. It is a variation of the system incorporated in our high pressure desiccant air dehydrators. Here, it is used as a stand-alone device, downstream of an air dehydrator whose built-in monitor/alarm system is unreliable or no longer supported by the original manufacturer, or in conjunction with an inter stage membrane dehydrator (IMD) not containing its own dew point monitor. The fi rst installation with an IMD is on USS MAHAN, DDG 72. Fittings furnished as standard allow easy installation at the end of the HPAC discharge hose.

    Measurement is made by a highly sensitive aluminum oxide sensor, which is bathed by a continuous stream of
    air. Its impedance varies with the air’s moisture content, and is read by the humidity alarm controller . The operator may adjust the controller to achieve the desired alarm point. The dew point meter on the front of the control panel displays the current outlet air dew point. A sample valve compatible with a MIL-I-24144 high-pressure frost point indicator is provided.

    If at any time the outlet air moisture content exceeds the controller’s set point, the controller activates the humidity alarm. This alarm includes the fl ashing red humidity alarm lamp , the audible alarm(buzzer), and the humidity alarm remote connection . The buzzer can be disabled by the audible alarm switch . The humidity alarm remote connection is a relay closure (closed on alarm) with a 6800-ohm resistor in parallel. The remote
    signal is ICAS-compatible.

  • Model HLI 9000 Mk II Enhanced Dew Point Hygrometer

    $0.00

    Portable Moisture Measurement: Repeatable, Fast, and Accurate.
    Replaces Stephens Analytical DL20N-EP5100 (HLI Model 7055-G501), HLI Model 5250 Low-Pressure Frost Point Indicator, Model 5100 High-Pressure FPI, HLI 9000 Mk I, or any other portable dew point monitor you are currently using. The HLI 9000 Mk II does it all!

    NSN: 6685-01-630-4878.

    Successfully met and exceeded NAVSEA specifications (MIL-PRF-28800, MIL-M-24144 and SCAT 4174)!

  • Model 7148 Mk I Low-Pressure Dew Point Monitor & Alarm

    $0.00

    This is the same system incorporated in our popular low-pressure membrane dehydrators. Here, it is a stand-alone device, usable independently or downstream of an air dehydrator whose built-in monitor/alarm system is unreliable or obsolete.

    The highly-sensitive aluminum oxide sensor is bathed by a continuous stream of air. Its impedance varies with the air’s moisture content, and is read by the dew point alarm controller. The digital display on the front shows the current outlet air dew point.

    • A simple, reliable method of measuring the dew point (moisture content) of low-pressure (0 – 150 psig) dry air systems.
    • Measurement made by aluminum oxide sensor.