New HIDS Drum Scales!
Click Here to Learn More!I want to use my HI 2110WI, HI 3030, HI 4050, or HI 2151/30WC in a weighing application and was hoping to use 100 pound increments for a 800,000lb application. I understand that this is at the limit of the unit and that perhaps 200 pound increments would be better?
The graduation size is the minimum increment displayed by the instrument. On the HI 2110WI, HI 2151/30WC, HI 3030, HI6300, HI6310, HI 6500, HI 6510, HI4060, and the HI 4050, there are 9 or 10 acceptable grad sizes to choose from: 1, 2, 5, 10, 20, 50, 100, 200, 500, and 1000 (in select units). If you try to enter a invalid grad size an ERR will flash on the display. Use the up and down arrow only to select the desired GRAD size.
The Internal Resolution is one part in 1,048,576 and the Displayed Resolution is one part in 985,000 for a 3 mV/V load point system. This would allow you to read up to your 800,000lb range.
Load cell limitations and external EMF-RFI signals limit the resolution. If you tried to read over 985,000, then you would run into problems with the displayed resolution. The stability of the reading would determine the minimum graduation size you could use.
For further information on accuracy and repeatability please review the Web Tech question "How can I mathematically calculate the accuracy and resolution of my weighing system?"
The graduation size would have an effect on the visible stability of your weight reading. You should not have any problems using a grad size of 100. Typically you would not exceed a weight ratio of 1 part in 10,000. This represents a stable and repeatable weight reading and is how you calculate the correct grads size. 800,000/10,000 = 80. The Grad size of 50 may be to small and the grad size of 100 is closer to a representative weight increment for a vessel of that size. This would be a vessel calibrated to 800,000lb by 100lb.
The grad size should be at least as large as the minimum resolution of your scale. For example, a 3300lb scale can be expected to fluctuate about 0.3. If you set the grad size to anything less than 0.3, then you will see the weight fluctuating by this amount. Realize your grad size is limited to values of 1, 2, 5, 10, 20, 50, 100, 200, and 500. This setting is the amount you will see the weight readings increment by (ignoring any decimal places). That is, if you have grad size of 1 and have two decimal places, you will see increments of 0.01. Normally you would set the grad size value to a rounded to the nearest standard graduation value, and set your decimal place resolution so you are not seeing the fluctuations. If you have a 3300 lb scale and you use decimal places, you should not use more than 1 decimal place and you should expect this least significant digit to fluctuate by 3 units (grad amount).
