Pegasor M –Sensor - Engine Emission Measurements - Application Note

When Pegasor Particle Sensor (PPS-M) is used in engine emission measurements, care must be taken not to risk the sensor performance by mishandling it during set-up and operation. Possible examples of mishandling are:

• Contaminating the corona needle and sensor insulators by exposing the sensor to exhaust gases without clean air supply on.
• Contaminating the corona needle by keeping the corona on when clean air supply is off. This may result in unstable corona voltage and current.
• Wetting the sensor internal parts by moist sample gas before the set sensor temperature is reached. Wetting the sensor may result in a low impedance warning and/or short circuiting the sensor (high negative output value).
• Zeroing the sensor before the measurement temperature has been reached. This may result in zero drift and offset.
• Allowing the sensor electronics temperature to increase above 50 °C may cause significant noise to the measurement signal. Exceeding 100 °C may cause permanent damage to the electronics.