Radiometric ash meter WILPO C 512

Applied measurement methods

The WILPO C 512 Radiometric Ash Meter is designed for continuous determination of ash content made directly on hard coals and lignite of various grain sizes and layer thickness carried on a conveyor belt of any width.

The innovative, radiation scattering and absorption measurement method applied in this ash meter enables measurements to be made on conveyor belts with steel cords, which is a complete novelty. This makes the ash meter a preferred choice for use on long and open conveyor lines, particularly in open cast mines.

Construction

The WILPO C 512 Ash Meter comprises two main units: measuring unit and readout unit. The measuring unit consists of a supporting structure, radiation head with dedicated Am 241 gamma radiation source, appropriately positioned detection heads and electronic system. The supporting structure dimensions depend on the size and type of the belt conveyor.

The supporting structure dimensions depend on the size and type of the belt conveyor. The basic component of the readout unit is a computer with dedicated software for carrying out various measuring functions, display of results (in numerical and graphical form), data recording and transmission to indicated recipients, e.g. to a control room.

Measurement unit of WILPO C 512 Ash Meter, where:

1 – isotope head
2 – measurement head (scatter)
3 – measurement head (absorption)
4 – layer thickness detector
5 – support
6 – controller unit

Basic technical data

Coal type:	hard coal and lignite,
Coal grain size:	0 – 300 mm
Coal layer thickness:	min. 100 mm (measurement start) max. 500 mm (temporarily up to 750 mm)
Conveyor belt:	plain, sandwich or with steel cables
Gamma radiation source:	Am 241 (closed source, special form, activity selected from 3.7 to 37 GBq)
Ash content determination accuracy (σ): in the range of 0 – 15% A^r in the range of 15 – 30% A^r in the range >30% A^r	1,5% 2,0% 2,5%
Rated supply voltage UN:	230V, 50 Hz
Power consumption:	300 VA