Angle grinder with measuring device

Zoom Image

Measurement of the electromagnetic fields on an angle grinder
Source: IFA

On behalf of the German Social Accident Insurance Institutions, the IFA measures electromagnetic fields at workplaces and evaluates the interference with active implants with respect to individuals. The measurements cover the entire frequency range of the fields, from static fields, through low-frequency to high-frequency fields.

Evaluation of non-sinusoidal or pulsed fields and checking of the observance of the exposure limit values constitute special cases of exposure evaluation. Special exposure evaluation methods are used in these cases (see below).

Computer simulation of EMF

Zoom Image

Simulation of the electromagnetic fields of an induction heating plant by means of the simplified body model
Source: IFA

Checking of observance of the exposure limit values

Should a violation of the upper action level be determined during evaluation of the exposure and measures for reduction of the exposure fail to have the desired success, the German Ordinance on the protection of workers against hazards presented by electromagnetic fields (EMFV) makes provision for checking of whether the normative internal body exposure limit values are observed. Since these values cannot be determined by measurement, numerical field simulation programmes and anatomical body models are employed.

Evaluation of pulsed fields

In order for non-sinusoidal or pulsed fields to be evaluated, such as those arising on electric resistance welding equipment, the EMFV makes provision for use of the weighted peak method (WPM) or the time-domain assessment method (TAM) described in Research Report 457 (in German) concerning the evaluation of non-sinusoidal and pulsed fields. Case studies of application of the TAM are described in detail in DGUV Informative publication 203-038 (in German) concerning the assessment of magnetic fields of electric resistance welding equipment.

* Software: ZMT Zurich MedTechAG, "Sim4Life" [software], Zurich, Switzerland; body model: IT'IS Foundation, "Virtual Population Human Models", Zurich, Switzerland



Ingo Bömmels

Division 5: Accident Prevention: Digitalisation - Technologies

Tel: +4930 13001-3480
Fax: +4930 13001-38001

Carsten Alteköster

Division 5: Accident Prevention: Digitalisation - Technologies

Tel: +49 30 13001-3481
Fax: +49 30 13001-38001

Dr Florian Soyka

Division 5: Accident Prevention: Digitalisation - New Technologies

Tel: +49 30 13001-3583
Fax: Fax: +49 30 13001-38001