13
Care and Maintenance
Calibration Check
It is rare for the meter calibration to change or the electronics to malfunction
without an obvious indication. If any ‘E’ codes display, return the instrument to
the Martin Lishman service centre.
To verify the instrument calibration:
Use the Quickcheck device with ATC on and no external probe connected.
Ensure the Grain Cell is clean and dry. Set the instrument to Wheat. Place the
Quickcheck on the Grain Cell and hold in position.
If the Grain Cell is not at 20°C:
For every whole degree above 20°C, ATC will subtract 0.1 %.
Example:
Quickcheck reading is 15.8% at a cell temperature of 25°C. ATC subtracts 0.5%
from 16.3% to give 15.8%. Instrument is therefore calibrated and working correctly.
For every whole degree below 20°C, ATC will add 0.1%.
Example:
Quickcheck reading is 16.6% at a cell temperature of 17°C. ATC adds 0.3% to
16.3% to give 16.6%. Instrument is therefore calibrated and working correctly.
Notes:
If a calibration has a bias adjustment, Quickcheck readings will reflect this.
Example:
Quickcheck reading is 17.1%, cell temperature is 17°C, wheat calibration is
biased +0.5%. The reading is derived from 16.3% (Quickcheck value at 20°C) + 0.5% (bias)
+ 0.3% (ATC) = 17.1%, so the meter is working correctly.
The column coloured yellow in the Calibration Chart on Page 8 gives the
values for other crops with the Quickcheck at 20°C.
Regular Servicing and Checks
According to most crop quality assurance schemes, your moisture meter should
be checked annually against oven tested crop samples. It is also important to
ensure that vital parts such as the grinder
-
compressor are working correctly.
The Martin Lishman service centre is fully equipped to service your moisture
meter throughout its working life. We also conduct testing clinics at various
locations around the country where you can check your meter and obtain a test
certificate to satisfy your crop assurance scheme.
See our website for the latest clinic details and to download a service return
form.
Press
.
Take a reading.
While the reading is visible, press
Λ
or
V,
the display will then show
0.0
, p
ress
to display Grain Cell temperature
The reading is
16.3% at 20°C,
which is correct.
