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Water activity and moisture content

What is


Sorption curve:  water activity and moisture content


Meter working principle ( one of many methods)

Hair hygrometer to measure relative activity 

Diy using digital hydrometer 

Aqualab: Role of Water activity in coffee , ie molding, or mycotoxins 

Primecoffea, helenacoffee is quoting misleading SCA figures from SCA's "washed arabica green coffee defect poster". But i think this is general guideline, rather than the rule, or standard.

ICO: different export countries have different national quality standards 

Eg Colombia: <12%

Rwanda: 10-12.5%

Uganda: <12.5%

Italy: <13% (incoming)

China: <12%

SCAA: 9-13 % from FAO, coffeeresearch




Some examples from panama geisha beans in a particular year, with scores of 88 or higher: 8.2 to 11.2 %


(Some )ICO say in general, range of moisture content is 8 to 12.5% 

Toper

Unified Grain Moisture Algorithm (UGMA)

Reference:

Sciendo impact of the roast level on chemical composition of coffee from colombia

Sciencedirect ISO1446, ISO6673 (105 deg c, 16 h, 1 ATM)

Moisture content of soil ASTM-D2216 YouTube 

Rotronic webinar

Royalcoffee

Mems capacitive sensor

Hacking capacitive soil moisture sensor based on TLC555

Yet another instructable based on LM393

Arduino forum

 theblinkingman plant watering project , github based on Si5351

Aquamatic  5300 using 150 MHz

Draminski using 4 frequencies 

CYEEYO: rmb902 TB

Researchgate frequency selection 

UGMA , design criteria, compliant testers

Stripline cell , 149 MHz

Jircas.jp , 10k to 10 MHz

Soil Capacitance probe 

LDS-1G: 149 MHz

Test cell dimensions 

coffmeter M1 is 41.5mm diameter 

Lebrew roastsee 105mm dia

Other Chinese brand 71mm

Agratronix: 64mm (2.5 inch)

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