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Chapter 3: Installation 31 of 60
GH Calibration
The load cell on a GH Hopper is FACTORY CALIBRATED. Since the load cell can be
subject to shock loading during shipping, moving, etc., we recommend that they be
recalibrated.
The heart of the rate monitor system is the load cell and the supplied calibration weight.
Since the load cell is weighing the amount of material entering the process, proper
calibration of the load cell is essential for the correct and accurate operation of the rate
monitor. This calibration must be performed upon initial installation and startup. The
calibration should also be checked once a month with a calibration weight and if
necessary recalibrated to ensure that it has not been damaged in the normal routine of
removing and replacing the weigh hopper for cleaning.
The calibration of the load cell is accomplished by using two reference points on the output
of the load cell scale. The first of these points is known as the “Tare Weight”. This is the
weight of the empty weigh hopper assembly on the load cell. This is also known as the zero
weight point (starting point) of the scale. This zero or starting point must be initialized with
an empty weigh hopper. There must be no binding or leverage put on the load cell.
The second weight point used in the load cell calibration procedure is a known amount of
weight for the weigh hopper. A calibration weight is provided with all rate monitors. The
calibration weight is stamped with its actual weight on top. If this is not available, any object
with a known weight accurate to the nearest 1/1000th of a pound, in the 2 - 10 lb. range,
proportional to your size rate monitor, will suffice. (The weight should be as close as possible
to the weigh hopper’s capacity.) The weight will be in pounds, unless the rate monitor is
provided for metric operation. In the case of a metric display, the weight to be used is
calibrated in kilograms.
Given the two weight points on the load cell scale, the controller should determine any other
weight on the load cell span. This is limited to the maximum capacity of the load cell. The
standard load cell used on rate monitors has a span accuracy of
1
/10%.
The maximum capacity of each load cell is clearly marked on top of the load cell. This value
will be indicated in kilograms (1 kg = 2.2 lbs.).
Weigh Hopper (Load Cell) Calibration
1. From the “Recipe” Page, touch the Manufacturer’s icon and enter “5413”, then press
the “Enter˝ key.
2. Touch “Calibration” and then “Scale Calibration”.