G4 Multi Channel Weighing Instrument. PM/DT/HE Technical Manual

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Technical ManualFlow rate update timeThe flow rate value is updated as shown in the table below. At start-up the accuracy ofthe flow rate will not gain full precision until after a full derivation time period.Number of weight conversions per Flow rate value update intervalderivation time period 100 but 200 but
G4 Multi Channel Weighing InstrumentHints and examplesFirst of all it is important to have a good weighing application where you usethe load cells in a good way to get high resolution and accuracy. It is possibleto use long filter time in the instrument to get a higher resolution and accuracy.To get rid of noise it’s important to have as high signal from the load cellsas possible.Example:We assume that you can calibrate the scale to get a stable weight reading withresolution 0.2 kg (use longer filter time if necessary).The flow rate function measures the weight difference during one derivation timeand we assume that we can get a weight error less than one weight division.• A derivation time of 10 seconds gives a flow rate error of:0.2 / 10 = 0.02 kg/s (72 kg/h)• A derivation time of 100 seconds gives a flow rate error of:0.2 / 100 = 0.002 kg/s (7.2 kg/h)In an application where you have a nominal flow rate of 1500 kg/hyou will get an error of:72 / 1500 = 4.8 % for a derivation time of 10 seconds and7.2 / 1500 = 0.48 % for a derivation time of 100 seconds in this example.If it is possible to calibrate the scale with a better resolution (you still needto have a stable weight) then you can achieve a better flow rate accuracy and/or ashorter derivation time.NOTE!The flow rate calculation is not depending on the final selected weight resolution.5-17
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G4 Multi Channel Weighing Instrument. PM/DT/HE Technical Manual

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