Forbes Marshall - Trusted Partners in Steam Engineering & Control Instrumentation

TunnelTech 601

The TunnelTech 601 Luminance photometer monitors the average luminance of a tunnel entrance and its surroundings. In accordance with Commission Internationale de l´Eclairage, (C.I.E.), publication 88, 1990 recommendations, the photometer monitors the average luminance within a 20 degree angle over a standard range of 0 – 6,500 cd/m2.

The detector is a metal/glass encased silicon diode photocell which is filtered to give a response that mimics the performance of the human eye. The detector is perfectly linear within its measuring range and has an instantaneous response to changing light levels.

  • Compliant with Commission Internationale de l’Eclairage, (C.I.E), publication 88, 1990.
  • Measurement of tunnel entrance luminance – 0 -6,500 cd/m ².
  • Calibrated using standards traceable to UK National Physical Laboratory.
  • Accuracy +/-1%.
  • Thermostatically controlled heater unit.
  • Rugged Aluminium housing to IP66.
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