K) Setting The Emissivity (Ems) - VOLTCRAFT IR 900-30S Bedienungsanleitung

k) Setting the emissivity (EmS)

IR 900-30S allows you to set the emissivity. This allows you to obtain more accurate results with different materials
and surfaces (also see "Operating principle").
manually setting the emissivity:
In the settings menu, press the "MODE" button (3) until the function indicator (19) reads "EMS". Use the "UP" but-
ton (2) and the "DOWN" button (8) to adjust the emissivity to the test object between 0.10 and 1.00.
See the table following the specifications in these operating instruction for common materials and the cor-
responding emissivity. Many organic materials have an emissivity of 0.95. Therefore, the factory setting is an
emissivity of 0.95.
automatically setting the emissivity:
IR 900-30S can automatically set the emissivity.
Insert a type K temperature sensor into the socket (4). Any standard type K temperature sensor with a mini plug can
be used. For accurate measurements, we recommend using a special type K surface temperature sensor (optionally
available). Hold down the measuring button (7) and the "LASER / BACKLIGHT" button (6) simultaneously until the
function indicator (19) reads "EMS" (flashing). Contact the surface to be measured with the type K temperature sen-
sor and - at the same time - measure the temperature of the same area using the IR measuring unit. Wait until both
temperature readings have stabilised and then press the "UP" button (2) to confirm. The calculated emissivity of the
surface is displayed (17). If the display reads "ERR" (error), the type K value is smaller than the IR value. In such a
case, repeat the procedure.
The provided wire probe is not suitable for measuring surfaces as the contact area with the test object is too
small.
The higher the surface temperature compared to the ambient temperature, the more accurate the emissivity
of the surface can be determined (>100 °C).
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