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| MIL-H-3177C
(b)
Fuel input. Fuel shall be measured directly by weight or
by volume. Measured volume shall be multiplied by known
specific weight of fuel. Overall accuracy shall be 2 percent
or better.
(c)
Temperature.
(1)
Exhaust gas. Temperature shall be measured by thermo-
couple, preferably chromel-alumel, in center of exhaust-
outlet pipe and not more than 12 inches from the com-
bustion chamber. Accuracy shall be within 10 F, in
the range from 500" to 1500 F.
(2) Ambient temperature shall be measured by two or more
radiation-shielded thermocouples preferably copper-
constantan, or by radiation-shielded resistance elements.
Accuracy shall be within 2 F.
(3) Coolant temperature at the heater inlet and outlet shall
be measured by an immersion thermocouple with junction
in a 1/8-inch-diameter protecting tube, installed with the
junction in the center of the coolant line and as close
as practicable to the heater- Accuracy shall be within
2 F, absolute and temperature-differential. between
inlet and outlet of the heater shall be determinable
within 0.259 F.
(d)
Exhaust back-pressure shall be measured by a manometer tapped
into the exhaust line and close as practicable to the heater.
The manometer shall be carefully zeroed, and precaution shall
be taken to avoid clogging the connecting tube with frost
during cold tests. Overall accuracy shall be within 5 percent.
(e)
Carbon-dioxide and smoke in exhaust. The carbon-dioxide content
of the exhaust gas shall be measured with an Orsat apparatus
as prescribed in the ASME Power Test Code, Supplement on
Instruments and Apparatus, Part 10, Flue Exhaust Gas Analyses,
or equal, as approved by the contracting officer. The smoke
measurement shall be in accordance with 3.8.4.1 unless an
alternate device is approved by the contracting officer.
Coolant pressures shall be measured by mercury-manometer or
(f')
calibrated pressure gage of suitable scale-
Coolant flow may be measured by timed flow-diversion to a
(g)
measuring container, using a stopwatch if diversion times
are leas than 1 minute; alternatively by a flowmeter calibrated
under the same conditions and flow ranges occurring in these
tests l
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