MIL-PRF-25435D
3.6.3 Damping. The transmitter shall drive the pressure indicator from full scale deflection to
14% of full scale deflection in 2 ± 1 seconds.
3.6.4 Overpressure. The transmitter shall withstand a 100% overpressure for a period of 10
minutes without being damaged.
3.6.5 Overpressure stop. An overpressure device shall be provided to restrain the pressure
sensing element within the range of 105 to 130% of full scale deflection on the pressure
indicator.
3.6.6 Case. The case shall conform to Figure 1. The case internal pressure shall be between
24.50 and 29.92 in Hg absolute.
3.6.6.1 Nonhermetically sealed leakage. There shall be no leakage out of the case with the
transmitter submerged in water to a depth of 18 inches maximum and with an absolute water
surface pressure of 2.5 in Hg.
3.6.6.2 Hermetically sealed leakage. The transmitter fill medium shall be clean 10±2 percent
helium with a moisture content of less than 0.006 milligram of water vapor per liter. The
leakage rate measured with a helium mass spectrometer shall be less than 0.1 micron cubic feet
per hour.
3.6.7 Electrical characteristics.
3.6.7.1 Transducer. The transducer pressure sensing element shall provide an output voltage
that varies linearly with variations in the difference in pressure between the two ports. (See
Figure 2.)
3.6.7.2 Transmitter. The transmitter shall meet the following requirements when a single-phase
excitation voltage of 26 V, 400 Hz, is applied across pins A and B.
3.6.7.2.1 No load current. When pin C is open, the transmitter current shall not exceed 160
milliamperes (mA).
3.6.7.2.2 Power consumption. The transmitter power usage shall not exceed 0.9 watt (W).
3.6.7.2.3 Terminal voltage. The voltage measured between pins A and C and between B and C
shall not exceed 18 V.
3.6.8 Weight. The transmitter shall not exceed 1.5 pounds.
3.6.9 Maintainability. The transmitter shall not require periodic lubrication or adjustment during
service. The transmitter shall be adjustable and capable of correcting indicator readings over
10% of full scale with no special tools.
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