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Overview Moisture Measurements

 
 

Just a few physical properties pass so manyfold through our daily life as moisture. The value of moisture is in many areas one of the important features of a product. Moisture has high meaning for the quality of products, for their processability or for the energy consumption during handling. This parameter often is neglected, although quick and informative moisture measurement can help to save high amounts of costs.

In commercial organic processes moisture content is besides the temperature the most important property. Decrease of moisture content below an optimal moisture content for the desired application leads to death of microorganisms carrying the process, while exceeding the optimum range leads to fouling.

 
 
 
 
 

In other applications moisture is a expression of quality, for instants when products are delivered or have to processed. Some billing systems - like in plastics recycling or in the use of biomass and woodchips- are based on moisture known or to be measured, or they are planned to base on moisture data. For deciding what is good or not it is necessary to not only have surface moisture, but also moisture infomation about the kernel of the material.

For singular reference measurements it is often sufficient to carry out spot checks and to determine the water content by drying methods or chemical reactions. Such spot checks are always combined with high personal effort and with a time delay of hours or even days.

Fast process solutions for field use or moisture measurements on a statistical basis taken from many singular measurements only can be realized with non-destructively operating moisture measurement methods.

Microwave moisture measurement methods are of this. Since more than 40 years they have been known. Starting form the 80s one can consider microwave moisture meters to be established in the process environment. Since more than 5 years they have been available as portable moisture meters too.

Microwave moisture measurements have some principal advantages over other methods due to physical reasons. They are:

  • accurate
  • fast and therfore useful also for moving goods
  • interacting in the materials volume
  • allowing different sizes of interaction volumina (from small to large)
  • based on a very closed interaction between water molecules and microwaves - much closer than for other physical principles
  • easily to use for process measurements
  • scalable in their sensitvity range

The until now most essential disadavantage of microwave moisture meters - their high price - was the main reason for only using them in applications, where no other solution was found.

This has changed very rapidly with the realization of the MOIST system. MOIST is a cost-effective unit construction system consisting of a number of moisture sensors with different microwave principles. To the system also control units and software tools are belonging. There are no applications where the use of a MOIST moisture sensors cannot be imagined.

 
 
PRODUCT MATRIX
Portable Moisture Meters MOIST 250

Handheld for moisture measurement system

MOIST 350

Handheld for grid moisture measurement system

MOIST 250 B

Portable moisture measurement system
for civil engineering

MOIST 350 B

Portable grid moisture measurement system
for civil engineering

MOIST TELE1

Telescope for measurements with
MOIST microwave probes

Measuring Sensors and Probes MOIST R1

Surface sensor

MOIST R2

Surface sensor

MOIST D

Volume sensor low penetration depth

MOIST P

Volume sensor high penetration depth

MOIST S

Volume sensor very high penetration depth

MOIST B

Beaker sensing head

MOIST BIO

Penetration sensor

MOIST ENDO

Endoscopic sensing head

Process moisture measurement MOIST RP

Surface sensing head

MOIST PP

Volume sensing head high penetration depth

MOIST BIO P

Penetration sensing head

MOIST T

Transmission configuration

MOIST CONTROL

Process control unit for
microwave moisture sensors of MOIST xP series

Laboratory moisture measurement MOIST xLAB 100

Laboratory moisture measuring instrument