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, MK II, and MK III or any other portable dew point monitor you are currently using. The HLI 9000 Mk IV does it all!
NSN: 6625-01-695-6862.
Successfully met and exceeded NAVSEA specifications (MIL-PRF-28800, MIL-M-24144 and SCAT 4174)!
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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, MK II, and MK III or any other portable dew point monitor you are currently using. The HLI 9000 Mk IV does it all!
NSN: 6625-01-695-6862.
Successfully met and exceeded NAVSEA specifications (MIL-PRF-28800, MIL-M-24144 and SCAT 4174)!
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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.
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.
The HLI 9000 Mk IV provides faster response to low dew points, reducing the waiting time for every measurement. This allows the user to spend less time verifying the dew point of his system. The HLI 9000 Mk IV gives a measurement down to -60° C (-76° F) dew point.
The HLI 9000 Mk IV has a USB port, enabling easy download of logged measurement data.
The Dew Point Indicator offers versatile sampling arrangements, ranging from simple fixed orifices for low-pressure measurement to configurable high-pressure sampling systems up to 5000 psig using the internal sensor.
The HLI 9000 Mk IV features a built-in pressure transducer for simplicity and increased accuracy of pressure-compensated measurements. The Mk IV also contains an internal pressure relief valve to ensure long-term stability and sensor life.
The menu-driven display, easily accessible gas connections and application software means that the user can quickly and easily set up the instrument and be taking measurements within minutes. All measurement parameters are available at a touch. The keys can be operated in rough environmental conditions where the operator may need gloved hands.
Best-in-class accuracy of ± 2° C (± 3.6° F) dew point provides better measurement confidence and workload coverage. The HLI 9000 Mk IV is designed as a line-powered device, and comes equipped with a rechargeable internal battery pack for those locations without an outlet within reach.
The HLI 9000 Mk IV is not suitable for use in hazardous areas or with hazardous gases. Consult the factory for information on models for these applications.
With more than 50 years’ experience in fluid processing systems, HLI understands what the user requires when it comes to spot checking dew point or moisture content in the field. The HLI 9000 Mk IV includes all the features you need for efficient work. An extremely responsive, accurate, and stable measurement is complemented by an instrument that’s easy to use, with data-logging and built in sampling standard and a wide range of available accessories, including a stand-alone sampling system and a hard transport case. It is NEMA 4 rated, and therefore suitable for demanding outdoor applications.
The HLI 9000 Mk IV uses a highly-developed ceramic impedance sensor, which is constructed using state-of-the-art thin and thick film techniques. Water vapor is absorbed into a porous non-conducting layer “sandwiched” between two conductive layers built on top of a base ceramic substrate. The active sensor layer is very thin – less than one micron – and the porous top conductor that allows transmission of water vapor into the sensor is less than 4 x 10-8 inches thick. As a result, the sensor responds rapidly to changes in moisture, both in detecting moisture and also when being dried. It is rugged and gives excellent dew point accuracy coupled with excellent long-term reliability and stability.
Performance:
Electrical input/output:
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General:
External dew point sensor for high-pressure applications (max. 6,500 psig)
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