Vaisala WAA151 - Mtbf; Mttr; Table 6 MTBF Values

User's Guide ________________________________________________________
26 _____________________________________________________ M210293en-A
Property Description/Value
Recommended
connector at cable end
SOURIAU MS3116F10-6P
Operating temperature
-50 ... +55 °C (with shaft heating)
Storage temperature
-60 ... +70 °C
Housing material AlMgSi, gray anodized
Cup material PA, reinforced with carbon fiber
Dimensions 240 (h) × 90 (Ø) mm
Swept radius of cup wheel: 91 mm
Weight 570 g
1) Measured with cup wheel in position least favored by flow direction.
Optimum position yields < 0.35 m/s starting threshold.
2) Standard Deviation
MTBF
According to the standard MIL-HDBK-217F calculated
mean times between failures are listed in Table 6 below.
Actually, the last column provides the failure frequency
during 10
6
hours of use.
Table 6 MTBF Values
Abbreviation Installation f/10
6
h
Gf Permanent installations 2.34
Gm Mobile installations 8.52
Nu Ship equipments 5.48
MTTR
Mean time to repair is 0.3 h.