RS Pro RS-836 Manuel D'instructions page 6

Heavy Duty InfraRed Thermometer with Circular Laser Targeting / English
• Reminders
1. 1.Not recommended for use in measuring shiny or polished metal surfaces (stainless steel,
aluminum, etc.).See Emissivity.
2. 2.The unit cannot measure through transparent surfaces such as glass. It will measure the
surface temperature of the glass instead.
3. 3.Steam, dust, smoke, etc., Can prevent accurate measurement by obstructing the unit's
optics.
• Emissivity
Emissivity is a term used to describe the energy-emitting characteristics of materials.
Most (90% of typical applications) organic materials and painted or oxidized surfaces have an
emissivity of 0.95 (pre-set in the unit). Inaccurate readings will result from measuring shiny or
polished metal surfaces. To compensate, cove the surface to be measured with masking tape
or flat black paint. Allow time for the tape to reach the same temperature as the material
underneath it.
Measure the temperature of the tape or painted surface.
13. Emissivity values
Substance Thermal emissivity Substance
Asphalt 0.90 to 0.98
Concrete 0.94
Cement 0.96
Sand 0.90
Earth 0.92 to 0.96
Water 0.92 to 0.96
Ice 0.96 to 0.98
Snow 0.83
Glass 0.90 to 0.95
Ceramic 0.90 to 0.94
Marble 0.94
Plaster 0.80 to 0.90
Mortar 0.89 to 0.91
Brick 0.93 to 0.96
8
Thermal emissivity
Cloth (black) 0.98
Human skin 0.98
Lather 0.75 to 0.80
Charcoal (powder) 0.96
Lacquer 0.80 to 0.95
Lacquer (matt) 0.97
Rubber (black) 0.94
Plastic 0.85 to 0.95
Timber 0.90
Paper 0.70 to 0.94
Chromium oxides 0.81
Copper oxides
0.78
Iron oxides
0.78 to 0.82
Textiles 0.90
Heavy Duty InfraRed Thermometer with Circular Laser Targeting / English
14. Maintenance
• Repairs or service are not covered in this manual and should only be carried out by qualified
trained technician.
• Periodically, wipe the body with a dry cloth. Do not use abrasives or solvents on this
instrument.
• For service, use only manufacturer's specified parts.
9