MIL-PRF-38230D
General requirements. The requirements of MIL-PRF-25435 apply as requirements of
3.2
this specification with the exceptions and additions specified herein.
Workmanship. The transmitter, including all parts, shall be constructed in
3.3
accordance with commonly accepted industrial workmanship standards.
Interface.
3.4
3.4.1 Pressure indicators. The transmitter shall sense the differential of two pressures, convert
the differential pressure to an electrical signal, and provide the unamplified signal to an
indicator conforming to MIL-I-25437, MIL-I-25438, MIL-PRF-27189, or MIL-I-38133.
External wiring between the transmitter and indicator shall be as shown in figure 1.
3.5
Performance.
3.5.1 Transmitter error tolerances. The transmitter shall meet the scale and, friction error
tolerances specified in tables I and II under the conditions noted for the tests herein and in MIL-
PRF-25435. The transmitter shall operate within these tolerances when connected as shown in
figure 1 to a standard indicating unit. The standard indicating unit shall be calibrated to a
maximum readout error of ±0.25 percent using the standard ratio transformer circuit in figure 2.
Table I. Scale error
Scale error tolerances (±psi)
Test points (psi)
Note 1
Note 2
Note 3
0
1.0
1.75
2.0
10
1.0
1.75
2.0
20
1.0
1.75
2.75
30
1.75
2.25
2.75
40
1.75
2.25
2.75
50
1.75
2.25
2.75
60
1.75
2.25
2.75
70
1.75
2.25
2.75
80
1.75
2.25
2.75
90
2.0
2.5
3.0
100
2.0
2.5
3.0
Note 1: Tolerance for the scale and friction error test at ambient temperature.
Note 2: Tolerance after endurance (10,000 cycles), humidity, power, and overpressure tests.
Note 3: Tolerance after vibration, low temperature, high temperature, endurance (60,000 cycles), temperature-
altitude, and low temperature exposure tests. Also, the tolerance after the transmitter has been subjected to the
80-hour high temperature exposure test and is returned to ambient temperature for minimum of 4 hours.
3
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