Maintenance
Factors affecting sensor accuracy
Various factors can cause the sensor to malfunction and can affect the accuracy and
sensitivity of the sensor. The following list identifies the most common factors that
can affect the sensor operation and can cause an irreversible damage to the unit. The
list below should not be considered as all inclusive.
• Rain / splash guard should be installed to avoid accumulation of dirt on the
flame arrestor on the stainless steel sensor head assembly. The accumulation of
dirt on the flame arrestor will clog the pores on the sintered disk and reduce the
diffusion of the gas into the sensor head assembly.
• Sensor calibration schedule should be in place to ensure proper operation.
• Protect flame arrestor from paint or high pressure water hose. If necessary
install some protective shield on the unit before painting or cleaning. Be sure to
remove the protective shield when finished.
Routine Maintenance
Model PT295 Sensors do not require routine maintenance. However, the sensors
should be inspected periodically to ensure proper operation.
Sensor Inspection
Keep the sensor flame arrestor clean. Avoid any accumulation of dirt and oil on the
filter since it will affect the diffusion of gas to the sensor. Use rain / dust shield for
protection. Refer to the list of spare parts for Rain/Dust shield part number.
Sensor Sensitivity
Sensor should always be calibrated in fresh air with using calibration gas with
recommended target gas concentration. When calibrated properly if the sensor
reaction is slow then the sensor head assembly should be replaced. Refer to Parts
List for sensor head part number.
PT295 Series Toxic Sensor Rev 5.1
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