SRI 1000

SRI 1000

SRI1000 in a lab setting where samples can be placed on top of unit

SRI 1000, Portable Emissometer/Reflectometer and Solar Reflectometer

Note: For information on AZ’s measurement services for reflectance, emittance and SRI toward LEED certification, see Optical Measurement Services.

AZ Technology’s newly released SRI 1000 Portable Emissometer/Reflectometer and Solar Reflectometer, is compact, lightweight, rugged, and ergonomically engineered for ease of use in the field, the laboratory, or on the manufacturing line, to determine ambient temperature total thermal emittance and solar absorptance (at air mass 1.5) of test surfaces for terrestrial applications. These two measurements allow the calculation of the Solar Reflectance Index (SRI) as defined for environmental certifications such as Cool Roofs and LEED.

The SRI 1000 can be conveniently used in a laboratory or manufacturingsetting (top right image) where samples can be sat atop the instrument and right while repeated measurements are being taken.

SRI 1000

SRI1000 testing a large sample

The SRI 1000 provides in a single unit:

1) A portable emissometer/reflectometer that performs optically integrated total hemispherical reflectance measurements from approximately 3 to 35 micrometers wavelength, yielding total hemispherical thermal emittance measurements.

2) A portable solar reflectometer that performs optically integrated total hemispherical reflectance measurements at air mass 1.5.

These two measurements can be used as per ASTM E1980 to calculate the Solar Reflectance Index (SRI).

The instrument includes a rolling carrying case, 2 rechargeable batteries, battery charger, instrument inspection head, display unit, and an operator satchel for portable use.

The table below lists specifications for the SRI 1000.


Emittance wavelength range 3um to 35um
Solar reflectance wavelength range 250 to 2500 nm
Measurement accuracy Within 1 to 3 percent of full scale depending upon the material.*
Repeatability ± 1% of full scale or better
Material type Virtually any opaque material**
Sample size and geometry Greater than 0.5 inches (1.25 cm) diameter
Flat or a moderate amount of curvature
Sample temperature Room Temperature, Ambient
Readouts Digital LCD display
Internal data storage, downloadable as .csv file.
Dimensions Optical Head: 5″ diameter x 8″ long
Control and Display Unit: 7.5 x 5.5 x 3 inches
Battery Box:6 x 3 0.75 inches
Warranty 1 year parts and labor

*Most natural and common materials are measured within ±2 percent.

**Materials that transmit light in the wavelengths of interest can be handled in some cases (instructions provided).