ASTM C1270-97 (R2021) pdf free download.Standard Practice for Detection Sensitivity Mapping of In-Plant Walk-Through Metal Detectors.
1.1 This practice COVCfS a procedure for determining the weakest detection path through the portal aperture and the worst-case orthogonal orientation of metallic test objects. it results in detection sensitivity maps. which model the detection zone in terms related to detection sensitivity and identify the weakest detection paths. Detection sensitivity maps support sensitivity adjustment and performance evaluation procedures (see Practices C1269 and C1309).
3. Terminology
3. 1 Definitions of Terms Specific to This Standard:
3. 1.1 clean-iesier n—a person who does not carry any extraneous metallic objects that would significantly alter the signal produced when the person carries a test object.
3. 1 .1.1 Discussion—By example hut not limitation, such extraneous metallic objects may include: metallic belt buckles, metal buttons, cardiac pacemakers, coins, metal frame eye glasses. hearing aids, jewelry, keys. mechanical pens and pencils, shoes with metal shanks or arch supports. metallic surgical implants. undergarment support metal, metal zippers, etc. in the absence of other criteria, a clean tester passing through a metal detector shall not cause a disturbance signal greater than 10 % of that produced when carrying the critical test object through the detector. Test objects requiring very high sensitivity settings for detection require more complete elimination of extraneous metal to obtain less than 10% signal disturbance.
3.1.1 .2 Discussion—The tester shall have a weight between 50 to 104 kg (110 to 230 lb) and a height between 1 .44 to
1 .93 in (57 to 75 in.). Should a given detector be sensitive to body size because of design or desired sensitivity, the physical size of testers should be smaller and within a narrower range.
3. 1. 1 .3 Discussion—It is recommended that the clean tester be surveyed with a high sensitivity hand-held metal detector to ensure that no metal is present.
3. 1 .2 critical orientation, n—the orthogonal orientation of a test object that produces the smallest detection signal or weakest detection anywhere in the detection zone: the orthogo nal orientation of a test object that requires a higher sensitivity setting to be detected compared to the sensitivity setting required to detect the object in all other orthogonal orientations. See Fig. 1 for handgun orientations.
3.1.2.1 Discussion—Critical orientations are determined by testing using a mapping procedure such as described in this practice.ASTM C1270 pdf download.