Fairbanks H90-3052-D Fairbanks Scales - Manual (Page 8)

50144 Rev. 4
SECTION 3:
OPERATION
3.2 General Weighing Operations
A. Basic Weighing
ON
If the instrument is OFF, press and hold the key
until the display comes on (begins warm-up cycle). Once
the warm-up cycle is complete, the indicator will respond
in the manner selected in the “Zero Range” programming
options.
The Zero function, Auto Tare function, and AZT require
the displayed weight to be stable before these functions
will operate. The weight reading is stable if the variation
in weight is less than the “motion range”.
3.1 Instrument Weighing Functions
The industry uses three terms which describe the appor-
tionment of an object’s weight. These terms are GROSS
WEIGHT, TARE WEIGHT, and NET WEIGHT.
Gross weight is the total weight of an object. This would
include any incidental materials as well as the primary
materials which comprise the object. Tare weight is the
weight of the incidental materials. Net weight is the
weight of the primary materials. Tare weight and Net
weight together equal the Gross weight. A can of house
paint is an object to be weighed. The can is incidental
material used to hold the primary material, paint, and the
label is incidental material used to identify the paint. All
of the incidental materials’ taken together make up the
tare weight. All of the primary materials’ weights together
make up the Net weight; in this case pigment, vehicle, and
solvent. The object is made up of incidental materials,
can and label, and primary materials, paint. Taken to-
gether, this is the gross weight.
The three weights can be expressed mathematically in
terms of each other as follows:
GROSS = NET + TARE
TARE = GROSS – NET
NET = GROSS – TARE
The equation, NET = GROSS – TARE, is particularly
important because it is the equation that a scale uses to
GROSS
NET
1. Press the key to select Gross as indicated
by the legend.
ZERO
2. With the platform empty, press the key. The
display will indicate zero and the Center-of-Zero leg-
end will appear.
The instrument is only able to measure the weight on
the platform. The instrument cannot tell if the weight
is from the object to be weighed or from some other
objects left on the platform. The operator must tell the
scale when there is nothing on the platform to be
ZERO
weighed. This is done by pressing the key.
The instrument will assign whatever weight happens
to be on the platform a zero weight value. This is
called the instrument’s zero reference.
Starting with an empty platform is not required. The
ZERO
key sets the display to “0”, if the weight on
the platform is within the allowable zero range.
Weighing in the Gross mode consists of pressing the
ZERO
key and placing a weight on the platform.
The display will show the Gross weight of the object.
The instrument understands Gross weight as the total
ZERO
weight placed on the platform after the key
was pressed.
3. Place the object to be weighed on the platform.
4. The weight will be displayed.
B. Tare Weighing
TARE
figure net weights in NET WEIGHING MODE. The gross
weight is a function of the weight on the platform and the
zero reference. Tare weight is always an operator defined
The tare weight is operator defined. The
TARE
RECALL
ENTER
key is
value. used to enter tare values. Press the key and the
value of the current tare in memory will be displayed.
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