HD2021T6 - HD2021T7 Luminance Transmitters thumbnail 1

Senseca

HD2021T6 - HD2021T7 Luminance Transmitters

Luminance transmitters for tunnel and road lighting control.

HD2021T7: equivalent veiling luminance (2000 cd/m² or 20 kcd/m² full scale); HD2021T7.2: atmospheric luminance Latm
HD2021T6: luminance at a 20° field of view (L20), 2, 20 or 200 kcd/m² full scale
0…10 V or 4…20 mA output, IP52, working temperature -20…+60 °C

Quantity

Overview

The Senseca HD2021T7 and HD2021T6 are luminance transmitters for tunnel and road lighting control, converting photometric luminance values into a 4…20 mA current or 0…10 V voltage signal, according to the version chosen. The HD2021T7 measures equivalent veiling luminance, which is essential to determine the threshold luminance at tunnel entrances according to UNI 11095, while the HD2021T7.2 measures atmospheric luminance (Latm) with a 2° angle. The HD2021T6 measures luminance with a 20° field of view (L20), as required to estimate threshold luminance at tunnel entrances according to CIE 88:2004; it can also be used to calculate vertical illuminance, or wherever luminance measurement is needed, such as projector screens and diaphanoscopes. Both use a silicon photodiode with filters that match the photopic response of the human eye, have IP52 protection and work from -20 to +60 °C. For distances above 50 m to the acquisition station, the current output version is required.

Typical applications

Tunnel lighting control: threshold luminance at tunnel entrances (UNI 11095, CIE 88:2004)
Street and road lighting control
Equivalent veiling luminance measurement (HD2021T7)
Atmospheric luminance Latm measurement (HD2021T7.2)
Luminance L20 and vertical illuminance Ev estimation (HD2021T6)
General luminance measurement, for example projector screens and diaphanoscopes (HD2021T6)

Key Features

Converts luminance into 4…20 mA or 0…10 V, according to the version chosen
HD2021T7 full scale 2000 cd/m² or 20 kcd/m²; HD2021T6 full scale 2, 20 or 200 kcd/m²
Custom full scale available for orders of at least 5 pieces
Silicon photodiode with filters matching the photopic curve V(λ), f'1 < 9%
HD2021T7 measures contributions up to 40° (CIE 88:2004 considers up to 28.4°)
HD2021T6 total field of view 20°
Sensitivity adjustment potentiometer
IP52 protection, working temperature -20…+60 °C
Power supply 16…40 Vdc or 24 Vac

Benefits

Standards-based tunnel lighting: supports threshold luminance evaluation to UNI 11095 and CIE 88:2004
Wider angular coverage: HD2021T7 evaluates veiling luminance contributions up to 40°
Long cable runs: the 4…20 mA version suits acquisition stations more than 50 m away
Flexible ranges: several preset full scales, or a custom full scale for orders of 5 pieces or more
Human-eye response: photopic spectral response for luminance readings that match visual perception

Specifications

HD2021T7 – EQUIVALENT VEILING LUMINANCE
Measured quantity	Equivalent veiling luminance (HD2021T7); atmospheric luminance Latm with 2° angle (HD2021T7.2)
Full scale	2000 cd/m² or 20000 cd/m² (chosen when ordering); custom scale for orders of at least 5 pieces
Output	4…20 mA or 0…10 V, according to the version chosen (current output required for distances > 50 m)
Angular response	Contributions evaluated up to 40° (CIE 88:2004 considers up to 28.4°)
Spectral response	Silicon photodiode with filters matching the photopic response; f'1 < 9% according to the standard photopic curve V(λ)
Calibration	Luminance measured on the output port of an integrating sphere with known luminance. Calibration uncertainty with fixed full scale 10% (confidence level 95%), if requested
Working temperature	-20…+60 °C
Protection degree	IP52
Dimensions (L x W x H)	148 mm x 60 mm x 66 mm
Power supply	16…40 Vdc or 24 Vac

HD2021T6 – LUMINANCE (CD/M²)
Measured quantity	Luminance (cd/m²), L20 at a 20° angle
Full scale	2 kcd/m², 20 kcd/m² or 200 kcd/m² (chosen when ordering); custom scale for orders over 5 pieces
Output	4…20 mA or 0…10 V, according to the version chosen (current output required for distances > 50 m)
Field of view	20° total
Spectral response	Silicon photodiode with filters matching the photopic response; f'1 < 9% according to the standard photopic curve V(λ)
Calibration	Luminance measured on the output port of an integrating sphere with known luminance. Calibration uncertainty with fixed full scale 5% (confidence level 95%), if requested
Working temperature	-20…+60 °C
Protection degree	IP52
Dimensions (L x W x H)	148.5 mm x 60 mm x 66 mm
Power supply	16…40 Vdc or 24 Vac

ORDERING CODES
HD2021T7.AV / HD2021T7.AA	Equivalent veiling luminance, 0…2000 cd/m², 0…10 V / 4…20 mA
HD2021T7.BV / HD2021T7.BA	Equivalent veiling luminance, 0…20 kcd/m², 0…10 V / 4…20 mA
HD2021T7.2.AV / HD2021T7.2.AA	Luminance by a 2° angle (atmospheric luminance Latm), 0…2000 cd/m², 0…10 V / 4…20 mA
HD2021T6.AV / HD2021T6.AA	Luminance, 0…2000 cd/m², 0…10 V / 4…20 mA
HD2021T6.BV / HD2021T6.BA	Luminance, 0…20 kcd/m², 0…10 V / 4…20 mA
HD2021T6.CV / HD2021T6.CA	Luminance, 0…200 kcd/m², 0…10 V / 4…20 mA
Note	For a minimum order of 5 pcs, ranges upon request are available.