REFERENCE TABLES

IP Ingress Protection Rating

1st Characteristic – Protection against ingress of solid objects 2nd Characteristic – Protection against ingress of water Numeral Description Numeral Description 0 No protection 0 No protection 1 Protected against solid objects larger than 50 mm 1 Protected against vertically falling water drops2Protected against solid objects larger than 12.5 mm 2Protected against vertically falling water drops when enclosure tilted up to 15 º 3 Protected against solid objects larger than 2.5 mm 3 Protected against spraying water 4 Portected against solid objects larger than 1.0 mm 4 Protected against splashing water 5 Protected against dust 5 Protected against water jets 6 Dust tight 6 Protected against powerful water jets7 Protected against the effects of temporary immersion in water

Relative Reflectivity of Materials

Material Relative Reflectivity Stainless steel, micro finish* 500 % Natural aluminium, unfinished* 175 % Stainless steel, brushed 150 % Black anodized aluminium* 144 % Opaque white plastic* 110 % White paper 100 % Dimension lumber (pine, dry, clean) 94 % Beer foam 88 % Kraft paper cardboard 88 % Newspaper with print 69 % Tissue paper, 2 ply 60 % Clear plastic* 50 % Tissue paper, 1 ply 44 % Rough wood pallet (clean) 25 % Opaque black plastic* 17 % Black neoprene 5 %Black rubber tyre wall 2 % Note: Shiny materials marked with *, the reflectivity value represents the maximum light return with the sensor beam exactly perpendicular to the material surface.

Unit Measurements

Unit Symbol Measurement Volt AC V ac Electrical potential – alternating current Ampere A Electrical current Volt DC V dc Electrical potential – direct current Degrees Celsius º C Temperature Hertz Hz Frequency (cycles per second) Lux lux Illumination (lm/m
2 ) Metre m Length Microsecond µs Time (10
–6 s) Milliampere mA Electrical current (10
–3 A) Millimetre mm Length (10
–3 m) Millisecond ms Time (10
–3 s) Nanometer nm Length (10
–9 s) Second s Time Volt V Electrical potential Volt Ampere VA PowerWatt W Power
WWW.TELCOSENSORS.COM GLOSSARY & REFERENCES

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