Radiation Interference Discrimination - BERTHOLD TECHNOLOGIES Process Control

Catalogue Radiation Interference Discrimination

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P	roduct I	nformation

Radiation Interference Discrimination


		100
		75
		50

	level	25
	fill	0
		-25
		-50


-channel 1			s"
-channel 2			7
		\
;—^	' /	y /
	/

The Nuclide makes the difference

The nuclides employed for weld inspections are different from the ones typically used in radiometric level gauges. Berthold Technologies' patented¹' level system LB440-RID exploits this difference to suppress the influence of interference radiation on the measurement. Nearly all weld or material inspections are performed with Iridium-192 or Selenium-75 sources. The energy of their radiation is low (<600 keV) compared to Co-60 (>1000 keV), commonly used in level gauges. In the detector, the radiation generates voltage pulses - their pulse height depends on the energy of the impacting radiation.

0 30 60 90

time [sec]

detector, the evaluation unit switches over to channel 2 and in this manner continues to accurately determine the fill level in the vessel.

With LB440-RID, the problem of weld inspections is considerably reduced. You have full and accurate information on your process - continuously! LB440-RID is already being successfully operated in many plants world-wide.

Get RID of your problems

All continuous level measurements employing rod detectors or the SuperSens point detector can be equipped with the patented¹' Radiation I nterference Discrimination LB440-RID. The system works only with Co-60 sources -the energy of the Cs-137 radiation (660 keV) is too close to the energy of sources commonly used in weld inspections to be reliably discriminated. Existing Berthold Technologies equipment can be easily upgraded to include the RID technology.

1)US patent No.6,753,532 B2 European patent pending

200

150

J/J CD

-I—i -t—i

100

200 400 600 800 1000

pulse height [mV]

1200

Pulses from weld inspection sources do not exceed a certain height and are thus not recorded in channel 2.

Always in control

In normal operation, the vessel level is detected from the count rate in channel 1. If interference radiation is registered by the

BERTHOLD

O G I

BERTHOLD TECHNOLOGIES GmbH & Co.KG ■ Calmbacher Straße 22 ■ D-75323 Bad Wildbad

Telefon 07081/177-0 ^ Fax 07081/177-100 www.BertholdTech.com