DH Instruments PPC2+, Руководство пользователя

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PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 4
1.2.2.2 ON-BOARD BAROMETER
The barometric sensor is NOT used as a source of absolute accuracy. It is used
ONLY to measure changes in atmospheric pressure to provide dynamic
compensation of the RPTs atmospheric pressure offset when using an absolute RPT
to make gauge pressure measurements.
1.2.3 PRESSURE CONTROL SPECIFICATIONS
+VV`KV_O]K\OÝ0=YP^ROKM^S`O\KXQO_XVO]]Y^RO\aS]OSXNSMK^ON
Modes and Ready (<*>)
Indication:
Static: Sets pressure within hold limit and stops active
control until hold limit is exceeded
Pressure is Ready (<*>) when within hold limit and
stability test is met
Dynamic: Sets pressure within hold limit and continuously
adjusts as close as possible to target
Pressure is Ready (<*>) when within hold limit
Control Parameters: Hold limit, stability limit (optimum values set by default, can be
customized independently for each measurement range)
Table 2. Default Pressure Control Parameters
Lo REFERENCE TRANSDUCER
RANGE 1, 2, 3
Hi REFERENCE TRANSDUCER
RANGE 1, 2, 3
HOLD LIMIT STABILITY LIMIT HOLD LIMIT STABILITY LIMIT
STATIC
MODE
± 1 % FS of the active
pressure range ± 0.005 % FS/sec
of the active
pressure range ± 1 % FS of the
active pressure
range ± 0.005 % FS/sec
of the active
pressure range.
DYNAMIC
MODE
± 0.005 % FS of the
active pressure range
or ± 2 ppm of range H3,
whichever is larger ± 0.005 % of the
active pressure
range ± 0.005 % FS of
the active pressure
range ± 0.005 % FS of
the active pressure
range