Moisture Meter

Moisture Meter

 

an instrument for measuring the moisture content in gases, liquids, and solids (including free-flowing solids).

The moisture in the air is usually measured with hygrometers and psychrometers. In hygroscopic electrochemical moisture meters the moisture of a gas is determined from the changes in properties of an electrolyte in the meter’s bulb.

The moisture in liquids (that is, the content in a water-liquid mixture where water is not the chief component, such as in petroleum or alcohol) is measured by means of capacity moisture meters that determine the dielectric constant or dielectric loss in the liquid, by conductance moisture meters that measure the liquid’s electrical conductivity, and by hygroscopic electrochemical moisture meters for gases that have built-in evaporators.

The moisture in solids is determined by means of capacity and conductance moisture meters. Use is also made of the resonance absorption of radio waves by the hydrogen nuclei in water molecules. With this type of meter the material being tested is placed within the coil of the oscillatory circuit of a radio-frequency transmitter, whose frequency can be changed continuously. At the frequency corresponding to the nuclear magnetic resonance the energy absorption increases sharply in the oscillatory circuit; the magnitude of the absorbed energy provides a measure of the material’s moisture. Radio isotope moisture meters compare the quantitative characteristics of interactions between the nuclear radiations and atoms of hydrogen and atoms of other elements. Those most commonly used depend on the attenuation of-γ-rays and the slowing down of fast neutrons.

References in periodicals archive ?
To simplify this process, we relied on a moisture meter to identify the ideal conditions for mold fungi, the growth of other bothersome microbial contaminants, and harborage of insect pests.
Water only when the soil is very nearly dry, as indicated by a moisture meter - available for around $5 at a garden center.
Mani Skaria, a professor of plant pathology at the Texas A&M University-Kingsville Citrus Center, shows how to do a simple inspection using a flashlight and a $35 moisture meter.
Tenders are invited for Local Purchase Of Digital Grain And Crop Moisture Meter
Delmhorst's J-2000 moisture meter is suitable for checking a variety of different wood species.
This project was conducted at the request of a local manufacturer to determine moisture meter correction factors for yellow-poplar bark.
Given the rough field environment inherent to forest fire, the duff moisture meter is designed to provide accurate results in the field with a minimum amount of sample preparation and measurement logistics.
TEXTOMETER DMB-10: a portable moisture meter for laboratory and production.
Tenders Are Invited for Compact Universal Digital Data Logging Moisture Meter, Seeds/grain Divider (Boerner Type), Parkhi, Enameled Plate, Seed Sampling Trier , Seed Grinder, Hot Air Oven, Grain Analysis Kit, Seed/grain Analyzer Copmplete With Hardware, Weighing Scale (Table Top), Seed Hand Test Sieves (Round Brass), Rice Broken Seprater , Illuminated Purity Work Board, Flexible Arm Illuminated Magnifier, Stereo Zoom Binocular Microscope, Digitle Grain Vernier Etc.
This communication is possible between the Extech EX845 clamp meter, the Extech InspectorPro MO297 moisture meter and infrared cameras ranging upwards from the Flir i/b60.
The Lignomat moisture meter DX/C, with an E-12 electrode, offers a wood moisture range of 5 to 65%, built-in species corrections for 20 different wood group settings which include exotic and domestic species, and an easy-to-read digital display, according to the company.
Model 400B Dole[R] Moisture Tester is a complete transistorized, portable moisture meter that features the capacitance method of measurement for dependable readings.