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Submit an interesting question to the board and we'll circulate it to our members who are most knowledgeable on weighing and sampling and post the answer here. Send your question by email to
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During a discussion with a client, the question came up as to why are sampling manufacturers changing from the standard three roll idlers under the sweep sampler to multiple rolls, when all the manufacturers have said bias tests have proved no bias with the three roll idlers. I understand one of the reasons was they are trying to get all the material in the corners, but again the three rolls didn't show bias in the past, so why change? |
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Is a Coupled in Motion (CIM) double draft track scale, if used with cars un-coupled, an acceptable reference scale used to material test a belt-conveyor scale? Over the years double draft track scales have been used successfully for material testing belt-conveyor scales. The State said no, and I was surprised because I have used the CIM double draft in other States with no problems. |
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Question 14 Based on your experience, would you see any moisture bias of commercial significants if the primary sweep sample dropped approximately 45 ft to the feeder feeding the crusher and secondary sweep module? Answer No. Manufacturers with experience testing their systems for bias, do not routinely have any problem passing the bias test with well-designed sampling piping. Sample Techs should maintain seals on doors and chutes, both to prevent rainfall inflow that could cause moisture increase, as well as prevent air inflow that could dry the sample out or cause dust loss. |
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"We would like to know if we weight the material on different weighing scale, will it show different weights? Steel components weigh less than or equal to 500 grams when weighed on jewelry shop. When weigh on grocery shop. When weigh on weighing scale in technical laboratory. When weigh on weigh scale for the heavy material (truck/transport vehicles)." ANSWER- The various static scales mentioned fall under different accuracy classes each having a different maximum value per scale Division (d). For example a truck scale with a capacity up to and including 200,000 lbs has a minimum scale "d" of 20lb or 50lbs on a scale with capacities over 200,000lbs. On the other hand a grocery scale with a maximum 50 lbs load capacity or less has a maximum d value of 1 oz. Jewellery or Laboratory scales have maximum "d" values in the range of 1 to 50 mg depending on the scale capacity. With this in mind scales used for groceries, jewellery etc would not weigh accuraterly on a truck scale because of the minimmum "d" value. |
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Questions & Answers
