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Global Power Technologies START-UP AND OPERATION
302842 Rev0 | Sentinel Page 30 of 61
4.3.3 ADJUSTING THE FUEL PRESSURE TO MEET CALCULATED TARGET OCV
Figure 20 – Fuel Pressure Adjustment
The Sentinel TEG’s fuel pressure factory setting is marked on the data plate as “Manifold Fuel
Pressure”. This may need to be adjusted to achieve the target OCV based on site altitude and ambient
temperature.
Allow the Sentinel TEG to run for at least 90 minutes before adjusting the fuel pressure. After running
for one hour, the TEG’s OCV should be close to 90% of its factory set OCV.
WARNING!
The maximum power output of the Sentinel thermopiles is 12-14 W (gross power).
Although it is possible to exceed this, doing so may cause major damage to the
TEG. In addition, surface temperature limits may be exceeded if run at higher than
recommended fuel pressures, which may lead to unsafe conditions when an
explosion or gas hazard is present.
To adjust the fuel pressure:
1. Remove the black cap from fuel pressure regulator.
2. Using a flat blade screwdriver, adjust the spring tension on the regulator by 0.4 in.H
2
O and wait
40 minutes for the TEG to stabilize.

Turn clockwise to increase the fuel pressure and OCV.

Turn counterclockwise to reduce the fuel pressure and OCV.
3. After 40 minutes, read the voltage again and determine if further adjustments need to be made.

If the measured OCV is not within 1VDC of the calculated target OCV and fuel pressure has
not exceeded at 3.3 in.H
2
O, then adjust the fuel pressure by another 0.4 in.H
2
O, allow the
TEG to stabilize for another 40 minutes, and read the voltage again.
Repeat this step until the voltage falls within 1 VDC of the calculated target OCV, or until the
regulator has been adjusted to 3.3 in.H
2
O, whichever comes first.

If the measured OCV is within 1 VDC of the calculated target OCV, the Sentinel TEG is ready to
operate.

If the TEG’s fuel pressure is at 3.3 in.H
2
O and the measured OCV is less than 23.6 VDC, consult
the Troubleshooting section and review “Low Output Power” to determine the cause and
corrective action.
4. Re-install fuel pressure regulator cap and record final OCV and fuel pressure settings in the
Performance Log located at the end of this manual.