MAS Photo Sensor

  • Photodiode Sensor
  • 4-20mA Output
  • 2-Wire
  • Loop Powered
  • Microprocessor

The MAS is a two-wire, microprocessor photo sensor providing a light level input into lighting control and building automation systems. The MAS has four models which are used in different locations in and around a building. Each is powered by 24VDC, but can accept from 18 to 30VDC. The output signal is 4-20mA. This robust signal can travel up to 4,000ft without the signal degrading. Both the 4mA and 20mA values are calibrated to factory standard footcandle settings using NIST traceable equipment; Indoor, Outdoor, Atrium and Skylight.

Sensor Style Min Adj Max 1/2 X Max 1X Max 2X
MAS-I Indoor 0 50 Fc. 100 Fc. 200 Fc.
MAS-O Outdoor 0 125 Fc. 250 Fc. 500 Fc.
MAS-A Atrium 50 500 Fc. 1,000 Fc. 2,000 Fc.
MAS-S Skylight 100 2,500 Fc. 5,000 Fc. 10,000 Fc.

MAS-CAL Field Calibration Unit

The MAS-CAL is the field calibration unit for the MAS sensor. It is designed to operate using a 9V battery or external 24VDC power supply. The MAS-CAL provides the MAS sensor with power from either source. The MAS-CAL is used to view and adjust the settings of the MAS sensor. Features
  • View and adjust MAS settings
  • Halve or double the factory set full-scale range
  • Double or reset to zero the factory set timing
  • 9V or 24VDC power supply