Global Power Technologies PRODUCT INFORMATION
302842 Rev0 | Sentinel Page 6 of 61
2.1 TERMS AND ACRONYMS
The following terms and acronyms are used throughout this manual:
GPT Global Power Technologies
Thermoelectric
Generator (TEG)
An appliance that produces electrical power by directly converting heat
to electricity.
Thermoelectric
Modules
Portion of the TEG that consists of thermoelectric materials that convert
differential temperature to electric energy.
Rated Power The nominal power that the Sentinel TEG produces when operating in an
ambient temperature of 20°C [68°F] at sea level.
BOCL At Beginning of Catalyst Cartridge Life.
Open Circuit Voltage
(OCV)
Voltage at the terminals of the power unit when no current is flowing
(open circuit).
This open circuit voltage is related to the temperature across the
thermoelectric materials inside the Sentinel TEG’s power unit.
This open circuit voltage is measured at certain ambient temperature,
specific altitude, with specific manifold fuel pressure, during factory
acceptance testing.
Open circuit voltage is used to set-up the TEG during commissioning and
annual maintenance. The open circuit voltage is directly related to
power output and is used as a baseline measurement to confirm power
output.
Manual Shut-off Valve A manually operated valve in the gas line that is used to turn on or shut
off the gas supply to the TEG.
Safety Shut-off Valve A valve that automatically shuts off the gas supply to the catalytic heater
assembly if the source of heat fails.
This valve is located inside the instrumentation enclosure and interrupts
the flow of gas to the rest of the fuel system/heater.
The safety shut-off valve has a plunger that needs to be manually
pressed and held down to initiate fuel flow to the system.
A thermocouple placed in the heater cartridge keeps this valve open
when the system is within the designated temperature range.
Catalytic Heater
Assembly
The catalytic cartridge combusts the fuel gas to provide heat without
flame using a catalyst-assisted chemical reaction.
Preheater A hermetically sealed cartridge containing a resistive heating element
used to preheat the catalytic pad to initiate the chemical reaction by
combusting natural gas.
Instrumentation
Enclosure
The main enclosure connected to the front of the TEG that contains the
electronics enclosure, access to the catalytic heater assembly, the fuel
assembly, and the start-up battery pack.
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