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Isolators




General Description

Traffic Sensor Corporation's 242 DC and 252 AC isolators were designed in accordance with the State of California publication "Traffic Signal Control Equipment Specifications", July 1991, and the City of Los Angeles publication "Traffic Signal Control Specification Type 170 ATSAC/Universal and Related Equipment", November, 1991. These models feature two independent isolation circuits on a common printed circuit board. These circuits provide isolation between electrical contacts external to the module and the controller unit input.

For the Model 242 DC isolator, common A.C. circuitry and power supply is used for both isolator circuits.
Each isolator circuit contains both D.C. input circuitry and D.C. output circuitry. Included are:
  1. A front panel test switch to simulate a valid input
  2. An LED in the output circuitry indicating the D.C. output circuit activated
  3. An optically coupled NPN transistor for the D.C. output.

For the model 252 AC isolator, each isolator circuit contains both A.C. input circuitry and D.C. output circuitry. Included are:
  1. A front panel test switch to simulate a valid input
  2. An LED in the output circuitry indicating the D.C. output circuit activated
  3. An optically coupled NPN transistor for the D.C. output.
  4. An optocoupler for the A.C. input
  Model 242 DC Model 252 AC
General Characteristics A.C. Power Input: 90 - 135volts, 57-63 Hz.
A.C. Input Current: 2.3 watts is typically drawn by the operating unit.
D.C. Power Input: 24 volts
A.C. Input: 0 to 135 volts
D.C. Input Current: a maximum of 100 milliamperes is drawn when operating.
Size 6.875 ± .01" long (from the end of the connector card edge to the front panel) x 4.40 ± .01" high x 1.12 ± .25" wide. The handle and the front panel increase the length to 7.925 ± .01".
Temperature -37 °C to +74 °C
Humidity From 5 to 95%


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