PPCH-G™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 2
Pressure Ranges
Four controller models from 20 MPa (3 000 psi) max to 100 MPa (15 000 psi)max.
Low uncertainty measurement provided by selection of Quartz Reference
Pressure transducer(s) (Q-RPTs)
Operating Media
Nitrogen, air, consult factory regarding other non-corrosive gases
Pressure Supplies
Test pressure supply: Greater than maximum pressure to be controlled by at
least 5% of controller range, but not more than 15%
greater than controller range, minimum 70% of
controller range. Must remain stable ± 1 % and flow
must be adequate to maintain stable supply while
slewing. into test volume.
Drive air supply:
500 to 800 kPa (75 to 120 psi)
Pressure Connections
DRIVE: 1/8 in. NPT F
TEST:
DH500F
SUPPLY:
DH500F
NOTE: DH500 is a gland and collar type fitting for ¼
in. (6.35 mm) coned and left hand threaded tube.
DH500 is equivalent to AE F250C, HIP HF4, etc.
ATM:
10-32
UNF
Pressure Limits
Maximum
working
T
test pressure: Controller or Hi Q-RPT maximum
Maximum
test
pressure
without
damage: 115 % controller or Hi Q-RPT maximum
1.2.2
PRESSURE MEASUREMENT SPECIFICATIONS
1.2.2.1
QUARTZ REFERENCE PRESSURE TRANSDUCER (Q-RPT)
Quartz reference pressure transducers (Q-RPTs) can be installed in PPCH-G to
obtain high precision and low uncertainty pressure measurement. One or two
Q-RPTs can be included in the PPCH-G and/or additional Q-RPTs can be used
externally mounted in a
DHI
RPM4 Reference Pressure Monitor (see Section 3.2.5).
All PPCH-G Q-RPTs are of the absolute pressure type (Axxx) using an evacuated,
permanently sealed reference. Axxx Q-RPTs used in PPCH-G can measure
absolute and gauge pressure. Gauge pressure is obtained by offsetting atmospheric
pressure and applying dynamic compensation for atmospheric changes using the
on-board barometer (see Section 3.2.4). See Section 3.3.3,
PRINCIPLE, for
additional information on absolute and gauge measurement modes.
PPCH-G models configured with two Q-RPT modules have only one
TEST
port.
PPCH-G internal valves and logic handle switching between the two Q-RPTs as
needed.
Table 1.
Quartz Reference Pressure Transducer (Q-RPT) designations and range
SI VERSION
US VERSION
RPT
DESIGNATION
MAXIMUM PRESSURE
Absolute and Gauge [MPa]
MAXIMUM PRESSURE
Absolute and Gauge [psi]
A100M 100
15
000
A70M 70
10
000
A40M 40
6
000
A20M 20
3
000
A14M 14
2
000
A10M 10
1
500
A7M 7
1
000
