DH Instruments PPC4, Руководство по эксплуатации и обслуживанию

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3. OPERATING PRINCIPLES
Page 25 © 2009 DH Instruments, a Fluke Company
Table 5. Settings Made by AutoRange
SETTING/SELECTION PURPOSE SET TO SECTION
Unit Set pressure unit of measure Operator specified during
AutoRange 3.2.10
Mode Set pressure measurement mode
(absolute, gauge, negative gauge) Operator specified during
AutoRange 3.2.11
Full scale Establish span maximum Operator specified during
AutoRange None
AutoRanged span Basis of span based setting
calculations Absolute mode: Zero absolute
to full scale
Gauge mode: Zero gauge to full
scale
Negative gauge mode: Minus
atmosphere to full scale
(negative equivalent of full scale
on BGxxx Q-RPT).
None
Q-RPT Select most appropriate Q-RPT
to cover range and mode and
operate PPC4 and RPM4
internal valving to connect the
selected Q-RPT to the
TEST
port(s) and shut off other Q-
RPTs in the system
Absolute and negative gauge
mode: Axxx Q-PRT with lowest
default full scale that is greater
than the AutoRange full scale
Gauge mode: Q-RPT with lowest
span whose full scale is greater
than AutoRange full scale, Gxxx
over Axxx if spans are equal.
None
Upper Limit
Lower Limit Set maximum and minimum
pressure control target limits Upper limit: 105 % of operator
entered full scale pressure
Lower limit: None in absolute
mode, zero in gauge mode,
minus atmosphere in negative
gauge mode, minus equivalent
of upper limit in negative gauge
mode on a BGxxx Q-RPT.
3.2.21
Resolution Set pressure display resolution 10 ppm of AutoRanged span or
1 ppm of default Q-RPT range,
whichever is larger. 3.2.19
Control Mode Select dynamic or static
pressure control Dynamic control 3.2.2
Control Parameters Set dynamic and static control
Ready/Not Ready control limits
Dynamic control hold limit:
± 50 ppm of AutoRanged span,
5 ppm of Q-RPT span or
0.4 ppm of controller full scale,
whichever is greater
Dynamic and static control
stability limit: 50 ppm of
AutoRanged span or 2 ppm of
Q-RPT span per second,
whichever is greater
Static control hold limit: 1 % of
AutoRanged span
3.2.2
3.2.3
Jog Step Set jog step size 100 ppm of AutoRanged span 3.2.20
Q-RPT turn down
(Premium class Q-RPTs only)
Turn down Q-RPT
characterization to improve
measurement uncertainty when
span is reduced See Premium Q-RPT pressure
measurement specifications 1.2.2.1