Mayer TS-101 Luminance Photometer

The light receptor is used within a solid state electronic system to measure average luminance (brightness) within an acceptance angle subtending 20º over a measurement range of 0-6500 cd/m² (as recommended by C.I.E.)

Accuracy is within +/- 5% of the CIE relative photopic luminosity curve.
The measurements are converted into an output signal of 4-20m/A (directly proportional to the luminance measurement (i.e. 4.0 m/A being given as zero luminance and 20 m/A by 6,500 cd/m²) for hard wire connection and signal transmission to a host controller.

The complete electronic system is contained within a water-proof thermostatically controlled housing of extruded aluminium (Protection Rating IP66).

The operating temperature range from minus 5º - 50º Centigrade withstands all extremes of weather conditions and ambient temperatures. Grounding straps are fitted as a protection against electrical thunder storms.

Each photometer is calibrated using ‘Standard Illuminant A’ (as recommended by the C.I.E.) using standards traceable to the British National Physical Laboratory and a covering Certificate of Conformity issued together with a 5-year warranty against defective components.

Mounting position: The general accepted standard is to site the TS-101 approximately 200 metres from the tunnel entrance (see CIE publications No 61 (1984) and No 88 (1990).

For practical reasons, the mounted height has to be above 4.5 metres. Also see BS 5489 (Part 7), British Dept. of Transport TD 9/81.

Recalibration checks: The silicone receptor is extremely stable over a long period. Recalibration checks are not normally necessary within ten-year periods.

Maintenance: Minimal. Occasional cleaning of the viewing window. (Not necessary if automatic Wash/Wipe unit is fitted).

Ancillary Accessories:
A range of ancillary accessories is available including Wash/Wipe Unit plus Pan-Tilt mounts for column or wall fixture.