DH Instruments PPC3 - Utility Sensor; On-Board Barometer; Pressure Control Specifications

PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 4
1.2.2.2 UTILITY SENSOR
Base PPC3 pressure controllers include a utility sensor. If a Hi Q-RPT
(see Section 3.2.4) is installed, there is no utility sensor.
Utility sensors are used for pressure control, system monitoring and safety functions.
They are intended for indication only, not to provide reference pressure
measurement. Q-RPTs (see Section 1.2.2.1) are used for reference measurement.
Warm Up Time
None required
Range
PPC3-10M: 10 MPa (1 500 psi) absolute and gauge
PPC3-7M: 7 MPa (1 000 psi) absolute and gauge
PPC3-2M: 2 MPa (300 psi) absolute and gauge
PPC3-700K: 700 kPa (100 psi) absolute and gauge
PPC3-200K: 300 kPa (45 psi) absolute;
200 kPa (30 psi) gauge
Resolution
0.001 % of span
Precision
0.1 % of span
1.2.2.3 ON-BOARD BAROMETER
The on-board barometer is used only to measure changes in atmospheric
pressure to provide dynamic compensation of the Q-RPT’s atmospheric pressure
offset when using an Axxx (absolute) Q-RPT to make gauge pressure
measurements.
Warm Up Time
None required
Range
70 to 110 kPa (10 to 16 psi)
Resolution
0.001 % of span
Precision
Predicted Stability
0.1 % of span
0.05 kPa/yr (0.008 psi/yr)
The on-board barometer is only present in PPC3s that have an Axxx
(absolute) or BGxxx (bi-directional gauge) internal Q-RPT.
1.2.3 PRESSURE CONTROL SPECIFICATIONS
PPC3-200K PPC3-700K PPC3-2M PPC3-7M PPC3-10M
Control Precision
± 0.002 % of reading or of 2 % of controller span, whichever is greater.*
Q-RPT used must provide resolution higher than expected
control precision.
Lowest Controllable Pressure
(gauge mode)
Zero set by automated venting. Lowest point above or below zero
limited only by Q-RPT resolution and control precision.
Lowest Controllable Pressure
(absolute, negative gauge modes)
1.5 kPa
(0.2 psia)
3 kPa
(0.4 psia)
5 kPa
(0.75 psia)
5 kPa
(0.75 psia)
10 kPa
(1.5 psia)
Ultimate Pressure
(absolute, negative gauge)
TEST(+) port is isolated and connected to vacuum
supply. Typically < 50 Pa (0.008 psia) depending on
vacuum source and test volume configuration.
5 kPa
(0.75 psia)
Typical Pressure Setting Ready Time
15 to 30 seconds.
Optimum TEST Volume
500 cc 500 cc 500 cc 250 cc 250 cc
Default Dynamic Control Hold Limit
± 0.005 % of current range
* Control precision is reduced in absolute mode under 7 kPa (1 psi) absolute.