56-101-01175 Revision P Page | 9
PRESSURE UNITS MOD
“B”
Ps Channel
Ps
ROC
(Rate of
Change)
Qc Channel
(Note: Pt = Qc + Ps)
RtQc
(Rate of Qc)
EPR
(Engine
Pressure Ratio)
Units
inHg (abs)
inHg/min
inHg (diff)
inHg/min
Ratio: Pt7/Pt2
Operating Range
2.9648 to
38.0000
0.1 to 16
0.0 to 40
(*6)
0.5 to 10
0.1 to 10
Calibrated Range
3.0369 to
32.1480 inHg
From 32.148 to
38 inHg
accuracy
derated
(*2)
0.1 to 16
Qc = 0.0 to 40
(*6)
Pt = 3.0369 inHg to
78.0 inHg
(*6)
0.5 to 10
0.1 to 10
Accuracy
0.01% FS
(*1)
± 0.003 inHg
± 2% of
value
± 0.010 inHg
(*3)
±0.005% FS rising
to ±0.06% FS (typ)
± 2% of value
0.01
Repeatability
± 0.001 inHg
-
0.001 rising to 0.005
-
-
Resolution
0.0001
-
0.0001
-
0.001
Stability
(12 months)
(*5)
0.01% FS (max)
0.005% FS (typ)
-
0.025% FS (max)
0.015% FS (typ)
(*4)
-
-
Table 5
MOD
“B”
Pressure Units Specifications
Note
(*1)
:
Ps Channel: Specification based on (0.01% FS) accuracy based on the calibrated
range of 3.0369 to 32.148 inHg (±0.003 inHg).
Note
(*2)
:
Accuracy from 32.1480 to 38 inHg accuracy is 0.01% of 38.0 inHg = (± 0.004 inHg).
Note
(*3)
:
Pt Channel: Specification based on typical accuracy (0.06% FS). As a result of the
Qc Auto Zero, the Qc Channel accuracy is 0.005% FS rising to 0.06% FS at (Qc =
25.6 inHg) = 650 kts. Above 650 kts = 25.6 inHg to 40 inHg, accuracy tolerance can
rise to 0.10% FS. Refer to Note
(*5)
below for more details.
Note
(*4)
:
This tolerance represents the stability over a 12-month period. The max
tolerance represents the worse-
case drift. The “typ” value represents what the
sensor manufacturer specifies as typical stability.
Note
(*5)
:
This tolerance represents the stability over a 12-month period. Barfield has
confirmed “typ” stability performance to be the expected performance that is
experienced. If this level of accuracy performance is required, the customer
should retain the calibration certificate results over the past recent year to have
proof of annual Incoming (As-received) results to prove the level of accuracy
required for the
customer’s application.
Note
(*6)
:
Pt max = Ps max + Qc max = 38.0 + 40.0 = 78 inHg.
Note
:
Accuracy specifications are based on performing the 12-month recertification
cycle when connected to a leak tight system.
Note:
Specifications are subject to change without notice.