User manual

H60.0.71.6C-04 Manual Appendix GMH 38-LW1 / -LW2 page 5 of 8
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9 Measuring of grain
For the storability, their quality assessment and purpose, the 38-LW Set is an important support of decision –
beside the decision of smell (fusty?) – Consistence (dust…) and appearance (colour, impurities).
When measuring grain pls keep in mind to use sufficient amount of measuring good (at least 500ml), sur-
rounding the sensor and that there is sufficient pressure between sensor and grain (in heap >30 cm and an
immersion depth of >20 cm this is usually automatically the case), otherwise there may be to low display
values!
With freshly harvested grain, an approximate recommendation for barley, rye und wheat can be given:
Less than 16 % u Measured material is sufficiently dry and storable.
16 - 20 % u Measured material includes increased humidity, appropriate dry before storage.
Above 20 % u extreme high humidity! Defer harvesting if possible or dry before storage
10 Wood Chips as fuel
Instrument settings for measuring wood chips:
GMH 3830/3850/3851 Version>= 1.5: h.461 (specialised GSF 38 / GSF 50 curve)
others: We recommend “Wood group C” (GMH 38x0 instruments: “h. C”). This group delivers a sufficient
accuracy for the fuel application up to 30% MC – above there is larger deviation.
Wood chips are classified in different quality groups.
The size and the moisture content (MC or u) or the wet-basis moisture content (w) is the measure for the
usability. Usually moisture content (w) of maximum 30% is recommended.
Chip size
Class
Size
G 30
small chips
smaller than 3 cm
G 50
mid size chips
3 – 5 cm
G 100
crude chips
5 – 10 cm
Moisture content
Class
Wet basis moisture content w
(can be displayed directly of GMH 3830 V>=1.5)
moisture content u
w 20
air dry
<20 % w
<25 % u
w 30
storable
20 – 30 % w
25 – 43 % u
w 35
conditionally storable
30 – 35 % w
43 – 54 % u
w 40
wet
35 – 40 % w
54 – 67 % u
w 50
fresh cut
40 – 50 % w
67 – 100 % u
The higher the moisture content, the lower is the heating value per weight
10.1 Field measuring
At measuring in containers, silos, chip bunkers or similar storages and a measuring depth > 0.5 m commonly
the compression is high enough for direct measuring.
Although keep pressure on the handle during the measuring!
For measuring in less than 0.5 m or in loose bulk material, best is to step on the measuring spot and insert
the probe below the foot.
At values above 20%u the display may have falling values: The display after 10 seconds is valid!