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Moisture Meter (Instant)
Instant Moisture Meter

Test Name : Moisture Content

Summary : Presence of excess moisture is paper based packaging has a multifold effect. The standard moisture in Paper or paper based packaging should be between 6-8%. Studies suggest that in case of Shipper Cartons, for every 1% increase in this moisture %, the compression strength of the cartons will fall by 6.5%. So when the moisture goes up to 12% (very common in monsoon season), the compression strength will take a dip of 26%. This needs to be accounted for while preparing specifications for packaging to be used in high humidity/moisture conditions.

Another major issue which specifically is of interest to the Food & Pharma industry is the formation of mildew (mold / fungus). Moisture and porosity in paper when combined with dark and cold climate of a warehouse, provide the perfect conditions for bacteria and fungus to develop and grow rapidly, which is a cause of serious concern.

Moisture should be kept under control to avoid rapid growth of such organisms.

 

Test Method :

There are 2 types of Tests :

  • Samples are weighed and then kept in an Oven @ 105 ± 2ºC for 2 hours. The loss in weight is found out and moisture % calculated as :

Moisture % = (Loss in Weight / Original Weight) x 100

This test works on the principle called “Loss On Drying” (or LOD in short) and is the most scientific way to testing moisture content or average moisture.

  • Samples are penetrated with an electronic device which measure the electrical resistance between 2 penetration points. Since electrical resistance is related to the moisture in the substrate, the correlation can be established.

These devices are known as the Instant Moisture Meters. They are the quickest way to detect moisture %, but it is to be noted that presence of any contaminant in the paper (usually in recycled paper) will have an effect on the electrical resistance. Also paper from different wood types will have slightly different properties and hence the moisture meter will not be a very accurate test method.

Further when testing corrugated boards, the moisture meter will tend to give you the peak moisture (because it measures the least electrical resistance) from amongst all the layers / plies of the board.

Eg. If we test a 5 ply corrugated board which as 12-10-10-10-10 moisture % in its layers, the Instant Moisture Meter will show a reading of 12%, whereas the Oven (LOD method) will give you a result of 10.4%

 

Oven method is the most authentic method but takes a lot of time. Test reports should be based on this method only.

Instant Moisture Meters are not the most correct method but offer quick results which may be good enough for in-process decisions and quick checks.

Tech Specs

Instant Moisture Meter. (Hand-Held)

The Instant Moisture Meter is an electrical resistance-type moisture meter, utilizing the relationship between moisture content and electrical resistance.

The contact pins mounted on the top of the meter are used for making direct contact with the material.

The Instant Moisture Meter is especially useful for testing paperboard, corrugated stock, and paper tubes / cores.

It is ideal for plant superintendents, inspectors, buyers and salespeople.

 

Models Available :

Model IMM-707 P-2000
Make GANN

Germany

DELMHORST

U.S.A.

Contact

Point

Pin Probe

(With Replaceable Tips)

Pin Probe
Measuring

Method

Electrical Resistance

(Electrometric)

Electrical Resistance

(Electrometric)

Display LCD LCD
Resolution 0.1% 0.1%
Power 9V Battery 9V Battery
Warranty 12 Months 12 Months

Note : Other brands & models also available.

Note : Instant Moisture Meters (of any brand / make) should be used for approximation only. Instant Moisture Meters measure the electrical resistance between the contact points (probes), hence they will measure only the maximum moisture % at contact point. If you use any Flat Probe Type unit, it will show the Surface Moisture only. If your use any Pin Probe Type unit, it will show the maximum moisture across the point of penetration. NO INSTANT MOISTURE METER IN THE WORLD can show the MOISTURE CONTENT of the sample Paper / Board, etc.

The Surface Moisture / Instant Moisture readings will vary from the Moisture Content value of the sample. This instrument is OK for quick checks under stabilized conditions or for testing paper.

For the most authentic Moisture Content analysis, use a Moisture Oven or Moisture Analyser which works on the LOSS ON DRYING principle and is the only recommended method as per TAPPI standards.

 

IQOQ Documentation Set available for Pharmaceutical companies

 

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