Codel TunnelTech - Model 601 -Luminance Photometer Monitor

According to CIE recommendations luminance should be monitored as the luminance contained within in a conical field of view, subtending an angle of 20º. It is recommended that the luminance photometer is mounted in the tunnel approach road approximately 120 - 200 metres from the portal, depending on the approach speed of the vehicles and their stopping distance.

The purpose of monitoring the luminance at the portal is to adjust the level of light intensity inside the road tunnel to the light intensity outside so that drivers do not have to adjust their eyes quickly or become affected by the “black hole” effect where they decelerate rapidly and become a hazard to other road users.

The TunnelTech 601 Luminance Photometer has a 4-20 mA output to export data to tunnel lighting control systems. The sensor is housed in a rugged aluminium enclosure which has an IP66 rating and has an internal thermostatically controlled heater. The enclosure may fitted with an optional wash/wipe system that cleans the window automatically. It is equipped with 5 litre capacity fluid container; the customer supplies the on/off switching.

Calibration against National Physical Laboratory standards is undertaken at the factory and should not be required in the field.

• Compliant with Commission Internationale de l´Eclairage, (C.I.E.), publication 88, 1990
• Measurement of tunnel entrance luminance – 0 – 6,500 cd/m2
• Calibrated using standards traceable to UK National Physical Laboratory
• Accuracy +/-1%
• Thermostatically controlled heater unit
• Rugged Aluminium housing to IP66

• Measurements: Luminance
• Measuring units: candela/metre squared – cd/m2
• Measurement Range: 0 – 6500
• Ambient Temperature: -20°C to +50°C
• Power supply: 220VAC or 24VDC
• Construction: IP65
• Analogue outputs: 1 x 4-20mA current outputs as standard
• Photodetector: metal/glass encased silicon diode photocell