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REP Particulate Matter PM Sensors

Q: What is a diesel particulate matter (PM) sensor?
A: The particulate matter sensor was originally developed for use in diesel emissions systems on commercial vehicles. The sensor is installed downstream of the diesel particle filter (DPF). It is designed to measure soot and ash levels in the particulate filter (DPF). This constantly monitors the aftertreatment system’s efficiency & soot levels in the DPF helping the ECU to optimize regeneration frequency & duration.
Q: How does a diesel particulate matter (PM) sensor work?
A: The diesel particulate filter sensor uses low-power radio frequencies (RF) to transmit & receive RF signals through the filter. Soot & ash accumulation levels, as well as filter failure symptoms, can be directly measured by changes in the RF signal.

Q: What do I need to know about working with PM sensors?
A: The PM Sensor is a smart sensor that reads solid matter (particulates) instead of gas like most other sensors. Care must be given when handling these sensors.
  • Handle with care. Sensors contain a ceramic element that is fragile.
  • Never use a lubricant on the sensor threads or tip.
  • Proper orientation of the sensor is required.
  • DO NOT CUT THE HARNESS when initially attempting to remove the sensor.
  • If damage to the threads occurs when removing the sensor, replace the bung.
  • If multiple PM sensor failures have been experienced, check for water damage.