MIL-DTL-27723F
3.6.1 Insulation resistance of temperature-sensing element. The temperature-sensing
element shall have an insulation resistance greater than 10 megohm (MΩ).
3.6.2 Thermal response. When subjected to an internal airflow of mach 0.3 at sea level,
the time constant shall not exceed 1.5 seconds.
3.6.3 Reactance. The impedance of the temperature-sensing element shall not vary more
than 0.04 ohm at any frequency from 0 to 2,000 cycles per second (cps) when tested for inductive
or capacitive reactance effect.
3.6.4 Self-heating. A current of 50 milliamperes (ma) in the sensing element shall not
change the resistance more than 3°C at sea level with an internal airflow of mach 0.3.
3.6.5 Static loading. The probe shall withstand static impact pressure up to mach 2.0.
3.6.6 Deicing and anti-icing. With the heater operating at rated voltage, accumulated ice
shall be removed from the inlet in less than 2 minutes and ice which would affect the temperature
indicator shall not re-form for a continuous period of 15 minutes when the probe is subjected to a
wind tunnel speed of 325±25 knots at a temperature of -30±5°C with a liquid water content of
1.25±0.25 grams per cubic meter.
3.6.7 Recovery error. The recovery error shall be no greater than 0.5 percent of the
absolute total temperature.
3.6.8 Conduction and radiation errors. Conduction and radiation errors shall not exceed
the tolerance specified in Table 1.
Table I. Aerodynamic conditions.
Stagnation Pressure
Stagnation Temperature
Allowable error in measured
mmHg
°C
stagnation temp ± percent
1,000
250
0.5
1,000
350
0.5
100
250
0.5
100
350
0.7
30
250
0.7
30
350
1.0
3.6.9 Deicing heater error. The deicing heater element shall not change the indicated
temperature of the temperature-sensing element more than 1°C when the deicing heater element
is operated at rated voltage and the probe is in an internal airflow of mach 0.3 at sea level
conditions.
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