Rice Moisture Meters 

​In 2015 APLMF agreed to summarise the test procedures used in each APLMF training course and then to survey its members to validate the test procedures and to provide some quality control. The validated test procedures will be later used to develop eLearning modules. 

The summary test procedures are provided to guide economies wishing to follow OIML recommendations. They contain abbreviated terms and formulae which are defined in the relevant OIML recommendation.

Information relating to rice moisture meters:
SUMMARY OF TEST PROCEDURES USED TO VERIFY RICE MOISTURE METERS
​Test Name
​Procedures Description
Environmental condition
  • ​The room temperature is in a range from 20 °C to 30 °C (with stability within ±1 °C).
  • The relative humidity is in a range from 30 % to 70 % (with stability within ±5 %). 
  • Place the moisture meter under test (MUT) and reference samples at the constant environmental condition at least 3 hours before the test.
Reference samples​ 
  • ​Prepare a set of reference samples of rice with different levels of moisture content (5 levels or more).
  • The above levels shall include a range of moisture content from 10 % to 20 %. 
  • Each sample shall be homogenized. 
  • The reference values of moisture content of the reference samples have been measured in advance with a reference (dry oven) method or a primary standard moisture meter.
Visual and electrical inspections​
  • There are no damages in the housing, display and sample holder.
  • LCD (liquid crystal display) functions correctly.
  • Instrument temperature agrees with the room temperature within ± 3 ºC.
  • Battery voltage is within a normal range (use a self-checking function).
  • Electrical performance of the meter is normal (use a checker-kit).
Measurement of errors
  •  Measure moisture contents of the reference samples using the moisture meter under test (MUT) at different levels (5 levels or more). 
  • Repeat at least 5 measurements at each level of moisture content.
  • Averages of the measurement results agree those of reference samples within MPE (maximum permissible error) specified by the national/regional authority.
SUMMARY OF ECONOMY REPORTS
This report is unavailable for rice moisture meters. 
SURVEY RESULTS ON ADOPTING THE RICE MOISTURE METER TEST PROCEDURES

Test name
Total economies surveyed
Adopted
Not implemented
Economies not responded
​1. Environmental condition
19
11
1
7
​2. Reference samples
19
12
1
7
​3. Visual and electrical inspections
19
12
1
7
​4. Measurement of errors 
19
11
1
7
​Economies responded
Cambodia, Canada, Hong Kong China, Indonesia, Japan, Malaysia, Mongolia, New Zealand, Papua New Guinea,  Chinese Taipei, Thailand, Vietnam

Economies not responded
Australia, China, DPR of Korea, Republic of Korea, Philippines, Singapore, United States of America