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Figure 21 – OCV Degradation vs. Days of Operation
5.1.3 DETERMINING CATALYTIC HEATER CARTRIDGE REPLACEMENT INTERVAL BASED ON LOAD
REQUIREMENTS
The heat output of the catalyst cartridge will degrade over time, this will affect power available to
the load. To ensure that load requirements are met, the cartridge will need to be replaced
periodically. To determine the frequency of replacement, based on site load requirements:
1. Determine correction factors for the site as described in Section 4.1, but use Figure 22 and Figure
23, based on worst case (highest) ambient temperature expected and altitude. For example, peak
summer temperatures are expected to be 30°C [86F], worst case temperature correction factor =
0.98. Combine this factor with your altitude factor by multiplying the 2 factor values.
2. Determine your minimum power requirement for your load.
3. Refer to Figure 24, follow the correction factor line that is most relevant to factor calculated in step
1 until it crosses the power requirement for your site. The x-axis value at this intersection will be
the number of days of operation before a catalyst cartridge replacement will be required. For
example, overall correction factor determined = 0.90 and minimum load requirement is 7.5 W.
Catalytic Heater Cartridge will require replacement after ~360 days.