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life span. Pellistor sensors can suffer degradation and shorten the life if powered while
exposed to flammable gas concentrations greater than 100% LEL, and also if exposed to high
levels of H2S or silicones.
Typical life of a toxic gas sensor which made by electrochemical component is dependent on
the application, frequency and amount of gas exposure. Under normal conditions (visual
inspections every 3 month and test/recalibration every 6 month), the Prosense oxygen and
toxic gas detector sensors have an expected life equal to or greater than 24 months.
Persistent exposure to high levels of toxic gas can shorten the life of toxic sensors. Toxic
sensors may also be cross-sensitive to gases other than their specific target gas, and hence the
Sensor Replacement:
presence of other gases may cause the sensor to respond.
The Flammable Catalytic and Toxic ECC cells that are used with the Prosense Sensor Head
have no serviceable parts. When they have reached the end of their operational life, simply
replace the cell. All replacement actions (sensor, sinter, and sensor head) have to be done by
Prosense service personnel as it needs some special steps should be performed in laboratory
Sinter Replacement:
environment.
Due to environmental conditions the metal filter - sinter at sensor head might lost
permeability that could negative impact on sensor performance. For example if the
installation includes cement or similar dust the sinter would be block the air/gas entry to
sensor. The sinter should be checked visually and replaced if necessary. To replace sinter
please check Diagram-1 and follow the below procedure:
1- Power of the Prosense detector
2- Loosen the locking grub screw
3- Unscrew the sensor head cap that holds the dirty sinter
4- Screw the sensor head cap including the clean sinter
Sensor Head Replacement:
5- Fix the Locking grub screw
Prosense sensor head is a separate part that can be replaced in the field. The sensor head
includes integrated sensor, electronic device and sinter in it. To replace sensor head:
1- Power-Off the Prosense detector
2- Disconnect sensor cables from the detector main board
3- Remove the sensor head from the body
4- Install sensor head
5- Connect the sensor cables to detector main board
6- Power-On Prosense detector
7- Leave detector working at least 4 hours in clean air environment
8- Perform full calibration for detector including zero and span calibration steps
PRS-UM-PC3-EN-Rev.04-06.2020
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