DH Instruments PPC2 AF - Barometer; Pressure Control Specifications; Static Pressure Control; Dynamic Pressure Control

PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 10
1.3.2.3 BAROMETER
The barometric sensor is not used to provide absolute accuracy, it is used only to
measure the changes in atmospheric pressure to provide dynamic compensation
of the reference pressure transducer atmospheric pressure offset measurements
when using a reference pressure transducer to make gauge pressure
measurements.
Range
11 to 16 psia (70 to 110 kPa)
Accuracy (Nominal)
± 0.5 % of reading
Resolution
0.001 psi (7 Pa)
1.3.3 PRESSURE CONTROL SPECIFICATIONS
Control Modes Available
Static and dynamic
Control Volume
0 to 30 in
3
(500 cc), ideal 7 to 15 in
3
(125 to 250 cc)
Control Limits
System defaults provided for each pressure measurement
range but can be customized by the user using the CUSTOM
CONTROL function.
1.3.3.1 STATIC PRESSURE CONTROL
Default Hold Limit
± 1 % of F.S. of the active pressure measurement range
Default Stability Limit
± 0.005 % of F.S./sec of the active pressure
measurement range
1.3.3.2 DYNAMIC PRESSURE CONTROL
Default Hold Limit
± 0.05 psi (138 Pa) for Hi Ref ranges (1 to 3)
± 0.0025 psi (7 Pa) for Lo Ref ranges (1 to 3)
Default Stability Limit
± 0.05 psi (350 Pa)/sec for Hi Ref ranges (1 to 3)
± 0.0025 psi (18 Pa)/sec for Lo Ref ranges (1 to 3)