Bulk Density meter
A little bit of history
Measuring the bulk density according to the European standard EN12580 is common sense in the peat and potting soil industry. In the year 1999 the European goverment determined that peat and potting soil must be traded based on Bulk density and volume. In short ENm³-volume in stead of m³-volume. The reason for this was that there where to many discussions if the right amount of product was delivered to it’s customer. When a truck was completely filled at the manufacturer’s factory, it depended on the distance traveled how optical the filling of the truck was upon arrival at the customer. Was the travel over a nice clean flat road the truck was optical completely full. But was the road not so flat and nice the product on the truck was more compressed at arrival and optical not fully filled. Trading in ENm³-volume would make an end on the discussions.
The industry was allready used measuring the bulk density by hand. A havy work, time consuming, inacurate method with a 20 liter cylinder and several screens resulting 1 or 2 measurements per batch.
EN12580 describes in detail how to determine the bulk density of your soil. The method uses screens with different meshes, dependent of the product you want to measure. The purpose of the screen is to prevent the soil from falling from such a height, that the soil which is already in the cylinder will be compressed due to the speed of the falling soil. The screen also regulates the amount of soil which can fall at a specific time as a whole in the cylinder. Due to this method, the cylinder will be filled as homogeneous as possible.
The INADCO Densimeter
The INADCO Densimeter is a bulk density meter that consist of 3 parts. A measuring module and a motor module. Both attached to a sub-frame.
The sampler module is electronic driven shovel that rotates trough a vertical product stream collecting a small amount of product.
The measuring module consist of a cylinder with the same volume as the cylinder used in the manual method. The measuring cylinder is mounted on a weighing cell.
With adjustable scoop rotation, the sampler takes samples from a vertical product flow. The shovel shall bring the collected sample toward the measuring cylinder where it will be obstructed so it shall fall in the measuring cylinder with zero vertical velocity. The sample taking will be repeated until the measuring cylinder is completely filled. The sample taking will pause and after the calculations the shovel shall rotate over the measuring cylinder to open the bottom. All the collected sample will slide out the cylinder back into the product stream. The shovel shall rotate back closing the bottom and starts again with the sampling. The time consumption of the sampling, calculation and emptying is around 60 seconds resulting in a measurement every 3-5 m³ of product. A much higher rate compared to the manual method.
Satisfied users of the INADCO Densimeter
Bulk Density meter in action
Bulk Density measurement in potting soil
The INADCO Densimeter is mounted in a factory that produces potting soil, bases on mixtures of various types of peat, fertilizers and other additives.
Due to the reproducing method of sampling and the used measurement volume, this results in a high quality of moisture measurement, which in turn ensures a better quality of the potting soil.
Introduction of the Bulk Density meter
The introduction of the Bulk Density meter in 2000. Combined with an INADCO Beltweigher for measuring the EN-Volume of potting soil.
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