Kett PM-450 User manual
Grain Moisture Tester PM-450
(version 4501)
Operating Manual
CONTENTS
1. Features ............................................................................................... 4
2.Specications ....................................................................................... 5
3. Part Names ........................................................................................... 6
4.Display/Keyboard ................................................................................. 7
5.PreparationandConguration ............................................................ 8
5-1.BatteryInstallation ........................................................................ 8
5-2.Productnumberviewing .............................................................. 8
5-3.Productnumberselection............................................................ 9
6.SampleExtractionandMeasurement................................................. 10
6-1.Manualhopper............................................................................... 10
6-2.Howtoextractasample............................................................... 10
6-3.Measurement ................................................................................ 11
7.Otherfunctions ..................................................................................... 14
7-1.Displayingtheaveragemoisturevalue ........................................ 14
7-2.Autopoweroff ............................................................................... 14
7-3.Batterylevelicon........................................................................... 14
8.ErrorDisplay ......................................................................................... 15
9.Instructionsforproperuse .................................................................. 17
10.ProductList.......................................................................................... 18
4
This instrument can measure the moisture content of many kinds
of grain, seeds, and other products. Using a fixed sample volume
allows the weight, temperature, and capacitance (dielectric) of the
sample to be measured. After processing this information with
the use of the embedded microprocessor, the “Moisture Value” is
displayed. Refer to the “Product List” for measurable grain versions.
Because the calibration curves of products on the “Product List”
have been already stored, the measurement of a sample on the list
can be instantly performed by simply pressing the product number.
1. Features
[Note]
The entered product versions may be different even among the same
PM-450 models. The display may be different between examples in the
Operating Manual and the real ones on the actual tester, but the usage
is the same.
5
2. Specifications
Measuring principle :Capacitance(Dielectric) (50MHz)
Applications :Grain, seeds, small objects
Measurement range : 1 - 40% (sample dependent)
Sample volume :240 mL
Operating temperature range
: 0 - 40 °C
Precision :<Moisture> Standard error of 0.5% or less versus drying method (all samples with
moisture content of less than 20%)
Correction function :<Mass> By integrated weighing scale
<Temperature> By thermistor
Other functions : Average, auto power off
Display :Digital (LCD)
Power supply : Batteries (1.5V "R6" or "AA" size, x4)
Power consumption :240 mW
Dimensions and weight : 125 (W) x 205 (D) x 215 (H) mm, 1.3 kg
Accessories : Funnel, Manual hopper, Brush, Batteries (1.5V “R6” or “AA” size, x4), Operating manual
6
3. Part Names
<Front> <Accessories>
Measuring section
(sample inlet)
Battery cover
Keyboard
Display
Inner cylinder
Funnel Manual hopper
(Sample cup)
Operating manual
Brush Batteries
(1.5V “R6” or “AA” size, x4)
7
4. Display / Keyboard
MEA. key
Measurement
POWER key
Power On/Off
Moisture value
Battery level icon
Product name
Product number
Sample in/out icon
Number of
measuring
SELECT key
Selection of products
AVG. key
Average value
8
5. Preparation and Configuration
• This instrument is equipped with an integrated weighing scale. For optimal results, this instrument should
be placed on a horizontal surface and used in locations where the wind is not strong and the instrument isn’t
subject to vibration.
• Donothittheinstrumentduringoperationanddonotleavetheinstrumentupsidedown.
• Althoughthisinstrumentperformsautomatictemperaturecorrection,foroptimalmeasurement,leavethis
instrument at ambient temperature for 2 hours or more before use.
• Thetemperaturesensorembeddedinthemainunitmeasurestheambienttemperaturearoundthemeasuring
unit and automatically performs temperature correction. If the temperature difference between the main unit
and a sample is ±10 °C or more, a measurement error may be generated and, therefore, the displayed measured
value blinks (warning indication) (see “8. Error Display” on page 15 and 16).
5-1. Battery Installation
Theunit is powered by four 1.5 V batteries (A A,
manganese). Remove the bottom battery cover,
place the batteries into the compartment, ensuring
to correctly orient the positive (+) and negative (–)
terminals. Then replace the battery cover.
5-2.Product number viewing
(1) Press the key.
(A buzzer sounds for 2 seconds, and all contents are
displayed)
(2) The number of the product that was measured during
the last test is displayed. In the case of the drawing
(right) the product number is “01 WHEA”.
9
5-3.Product number selection
Select a product number to be measured from the
"Product List".
(1) Every time the key is pressed, the product
number is displayed in the following order:
"01→02→03→04→· · ·".
(2) For example, to change to “03 CORN” when “01
WHEA” is displayed.
(3) Press the key twice to adjust the product number
to "03".
(4) Now, “03 CORN” is selected.
[Note] The product number is memorized while
the instrument is off, and therefore, the
last selected number is displayed when the
instrument is turned on the next time.
10
6-1. Manual hopper
6. Sample Extraction and Measurement
Use of Manual hopper
<Items to be used>
6-2.How to extract a sample
(1) Mount the funnel on the manual hopper, and load
a sample into the funnel to one-third of the funnel
depth.
(2) Remove the funnel to eliminate surplus sample and to
level off the sample.
[Note] Never extract a sample directly with the manual
hopper.
Funnel Manual hopper
Funnel
Manual hopper
11
6-3. Measurement
(1) Make sure that there is no residual sample in the
measuring section, and press the key.
[Note] First, the decimal point blinks.
During the blinking, a zero adjustment (tare)
of the weighing scale is performed. Therefore,
never move the instrument. If the instrument
vibrates even slightly, a zero adjustment cannot
be performed, and the decimal point blinking
may not stop.
(2) After the sample in icon starts to blink, load the
sample from the manual hopper into the center of the
measuring unit as shown in the drawing on the right.
Load the sample at a constant speed for the entire
sample to be loaded within 5 to 6 seconds.
The sample should be level within the measuring
section.
[Note] If the sample is not level in the measuring
sect ion, t he moisture content may not be
correctly measured.
During blinking, do not move the instrument.
12
(3) After the decimal point blinks for approx. 5 seconds, the
measuring count and moisture content are displayed.
Display example : 01 WHEA 1TIMES 13.5%
(Product number : 01 WHEAT,
1st measurement, moisture content 13.5%)
The measuring count is displayed from 1 to 9.
The 10th measuring count is displayed as 1.
[Note 1]
For samples with high moisture content, the moisture
content difference among individual grains is
large. While the moisture content can be displayed,
measurement precision is not as good as lower
moisture content samples.
[Note 2]
When the moisture content is below the measurement
range, "Lo" is displayed, and when the moisture
content is above the range, "Hi" is displayed.
[Note 3]
Measurement of tapioca flour, wheat flour, corncob meal,
feed barley meal, dried bean curd, buckwheat flour, tea, etc.
(items to be measured vary with tester versions)
When the sample is loaded into the measuring unit,
some sample may r emain on the electrode at the
center of the measuring unit. In such cases, use the
attached brush to put the sample into the measuring
unit within 5 seconds of the decimal point blinking. If a
measurement is performed while the sample remains
on the electrode, an error may occur.
(example of below measurement range)
(example of above measurement range)
13
[Note 4]
Measurement of pine pulp, cashew nuts, etc.
(Items to be measured vary with Instrument versions)
For samples that are likely to be caught by the
electrode such as pine pulp, break the samples into
fine pieces before measurement or eliminate pieces
that are likely to be caught before measuring.
(4) After the sample out icon is displayed, discharge the
sample to prepare for the next measurement.
[Note] The moisture content is displayed even after
discharging the sample, but pressing the key
clears the moisture content, blinks the decimal point,
and starts the zero adjustment.
When samples with the same product number are
continuously measured, repeat operations from “6-2. How
to extract a sample” on page 10.
When samples with different product numbers are measured,
repeat operations from “5-3. Product number selection”
on page 9.
14
7-1. Displaying the average moisture value
When the measurement count is 2 to 9, the average
value can be calculated (simple arithmetic mean).
Pressing the key displays the average value of
measurements from 1st to the current (up to 9).
In the example at the right, “ the average of 2
measurements is 13.5%”.
[Note] When the key is pressed once, the next
measurement count starts from 1st.
7-2. Auto power off
If no measurement or operation is performed for 3
minutes with the power on, the power is automatically
turned off to avoid battery drain.
A buzzer sounds and the displayed contents disappear.
7-3. Battery level icon
When the battery is low, the battery level icon ( )
appears on the display.
When the icon appears, replace the
battery
with new
ones reference "5-1. Battery installation" on page 8.
[Note] The moisture content may not be properly
measured when the battery level icon displayed.
7. Other functions
15
The following error are displayed when this instrument or usage conditions are not normal. In such cases,
please contact us because repair may be necessary. This is also true should other error messages be
displayed.
8. Error Display
Error Display Description
Main unit board
temperature is too high
60 °C or higher
Main unit board
temperature is too low
−10 °C or lower
Tare weight is too heavy
Tare weight is too light
Sample temperature is
too high
60 °C or higher
Sample temperature is
too low
−10 °C or lower
Error Display Description
Problem with
the temperature
measurement circuit
Problem with
the capacitance
measurement circuit
Problem with the weight
measurement circuit
Measured capacitance
is empty or too high
Main unit temperature is
too high
60 °C or higher
Main unit temperature is
too low
−10 °C or lower
16
Warning indication (measured value blinking)
• The main unit temperature is above (or below) the
operating temperature range.
• The main unit board temperature is above (or
below) the operating temperature range.
• The sample temperature is above (or below) the
operating temperature range.
• The temperature difference between the sample
and main unit board is 10°C or more.
17
(1) This tester is a precision instrument equipped with an integrated weighing scale. To avoid instrument
failure, do not hit the instrument or drop it.
(2) Do not directly touch the metal part of the measuring unit with your hand. Failure to observe this may
generate static electricity which may lead to breakdown.
(3)
The protrusion inside the measuring unit is the temperature sensor and, therefore, be careful not to break it.
(4) When the inner portion of the measuring unit becomes dirty, use a soft damp cloth to wipe inside.
Never wash this tester in water.
(5) When this tester is not used for a long period of time, remove the batteries.
(6) If a displayed measured value is not normal or is questionable, stop using this tester immediately and
contact us.
9. Instructions for proper use
18
No. Products Measuring range Standard method S.E.C. (Range)
1Wheat 6-40% 130℃ 5g ground 2hr 0.5% (6-20%)
2Barley 6-40% 130℃ 5g ground 2hr 0.5% (6-20%)
3 Corn (Maize) 6-35% 130℃ 5g ground 4hr 0.5% (6-20%)
4Soybean 6-30% 105℃ 5g ground 5hr 0.5% (6-20%)
5Canola (Rapeseed) 6-30% 105℃ 5g whole 5hr 0.5% (6-20%)
6Rye 6-30% 130℃ 5g ground 2hr 0.5% (6-20%)
7Oats 6-30% 130℃ 5g ground 2hr 0.5% (6-20%)
8Sorghum 6-30% 130℃ 5g ground 2hr 0.5% (6-20%)
9Sunflower (Large) 6-30% 105℃ 5g whole 17hr 0.5% (6-20%)
10 Sunflower (Medium) 4-20% 105℃ 5g whole 17hr 0.5% (4-20%)
11 Sunflower (Small) 6-20% 105℃ 5g whole 17hr 0.5% (6-20%)
12 Long paddy 9-35% 130℃ 5g ground 2hr 0.5% (9-20%)
13 Long milled rice 9-20% 130℃ 5g ground 2hr 0.5% (9-20%)
14 Hazelnuts 4-15% 105℃ 5g ground 5hr 0.5% (4-15%)
15 Buckwheat 6-30% 105℃ 5g ground 5hr 0.5% (6-20%)
16 Peanuts 4-20% 105℃ 5g ground 5hr 0.5% (4-20%)
17 Black pepper 4-20% Toluene distillation 0.5% (4-20%)
18 Mung bean 6-30% 130℃ 5g ground 2hr 0.5% (6-20%)
19 Beans 6-30% 105℃ 5g ground 5hr 0.5% (6-20%)
20 Pea 6-35% 105℃ 5g ground 5hr 0.5% (6-20%)
21 Clove 6-20% 103℃ 5g whole 17hr 0.5% (6-20%)
22 Dry cherry coffee 4-40% 105℃ 10g whole 16hr 0.5% (4-20%)
23 Green coffee 4-30% 105℃ 10g whole 16hr 0.5% (4-20%)
24 Roast coffee 1-20% 103℃ 5g ground 2hr 0.5% (1-20%)
25 Parchment coffee A (Arabica) 4-40% 105℃ 10g whole 16hr 0.5% (4-20%)
26 Parchment coffee R (Robusta) 4-40% 105℃ 10g whole 16hr 0.5% (4-20%)
10. Product List
version 4501
19
1310·HI·0101·PDF
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● Thecontentsofthismanualaresubjecttochangewithoutnotice.
● Theappearances,screens,etc.ofthe productandaccessories
displayedonthismanualmaydifferfromtheactualones,however,
operationsandfunctionsarenotaffected.
● Alleffortshavebeenmadetoensurethecontentsofthismanualare
accurate.However,ifyounoticeanyparttobeunclear,incorrect,
omitted,orthelikeinthismanual,pleasecontactus.
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This manual suits for next models
1
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