24 TX9165-UM-EN-07
3. Installing
3.1 Safety Precautions
Hazardous Areas
Do not disassemble the Sentro 8 Sensorstation whilst in the hazardous area or use
a sensor that has a damaged housing in the hazardous area.
Evacuation
If a dangerous level of gas concentration is detected by a sensor, leave the area
immediately.
Operating Life of Gas Sensors
Electrochemical cells contain an electrolyte that is gradually consumed during use.
The average life is about two years, dependant upon the duty cycle. The response
should be checked at regular intervals. Refer to Chapter 7 - Maintenance for further
information.
Sensitivity
Electrochemical cells for toxic gases can be affected by other interfering gases
which may displace the subject gas being monitored. Steam laden atmospheres
and condensation can also reduce the sensitivity.
Flammable
Be aware that some toxic gases are also ‘flammable’ at high percentage
concentrations.
Operating Limits of Catalytic Combustion Sensors
Catalytic combustion gas sensors positively detect the presence of flammable gas.
They rely upon the presence of oxygen in the atmosphere and should only be used
for gas concentrations up to the Lower Explosive Limit (LEL).
After this point, the output becomes non-linear and may erroneously indicate
that the gas concentration is below the LEL. They should not be used in oxygen
enriched or deficient atmospheres.
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