The MRDA8 is a battery operated, hand held moisture meter designed for laboratory or in plant test conditions. It can test materials with a fairly constant bulk density and a consistent change of radio frequency properties with change in moisture content, including semisolids, powdered, granular, or textile materials. Great for all types of coffee beans at all relevant moisture levels, especially for non destructive
moisture determination of green coffee beans through burlap coffee sacks.
Operating on the patented radio frequency power loss absorption principle, the DA8 projects an RF Field in to the test area. The RF Field extends approximately three inches from the electrode needles. Any material containing moisture will absorb part of this current and cause a change in the meter readings. The meter reading is converted in to moisture content by referring to a pre-programmed calibration curve established for the material being tested.
The needle electrode consists of two 3/16th" tapered stainless steel needles, positioned 3/4 inch apart.
Longer needles test and average more sample, and yield steeper calibration curves. Three different sizes are available for coffee sacks, depending on the most suitable configuration for the application.
MRDA8 COFFEE MOISTURE PROBE
FOR NON DESTRUCTIVE MEASUREMENT OF MOISTURE IN BURLAP COFFEE SACKS.
All stages and types of coffee including roasted whole bean and ground coffee
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It has been determined that most granular types of materials are somewhat less uniform in moisture content distribution, and in density variations, than is generally assumed. This is especially true of materials that are on a drying system, or that have just been removed from a dryer. Sometimes, even materials that have been packaged can still show some of this non-uniformity.
The real problem is to try to decide just how large a sample should be taken, and from where, in order to obtain representative cross-sections of the moisture content of the whole lot. Actually a large number of samplings should be taken and averaged. However, the total time required, the delayed answers, and the ruined product involved in running such samples by means of oven drying determinations ( or other laboratory methods) make these methods usually either impractical or impossible.
Because of its' non-destructive testing and extreme speed, the Model DA8 is an ideal and unique instrument for this type of testing. Needle electrodes can be inserted into a product in different locations, -with each sample reading taking only a few seconds. Ten readings should require only 20-30 seconds. Thus a large volume of sample can be tested, with the minimum, maximum, and average moistures quickly established.
The reading for a sample tested by the Model DA8 instrument should always be the average of not less than 5-10 individual readings.
Modules range in sensitivity from low sensitivity for high moisture content to high sensitivity for low moisture content. Module 010 has the lowest sensitivity while Model 250 has the highest sensitivity. Includes standard assembly for checking the calibration of the electronics.