This equipment described in this manual is designed and manufactured for the intended purpose of
generating high pressure gas. Certain precautions need to be followed during installation and operation of this
device. Reading and understanding this material is essential to the safe and correct operation of the unit.
Pressurized equipment is potentially dangerous. The equipment described in this manual generates and
controls very high gas pressures. It should not be operated by anyone who has not become thoroughly familiar
with this manual. Additional training in general and pressure specific safety procedures will help assure
protection from harm or damage to personnel or property. Responsibility for the proper and safe operation of
this instrument rests with the user.
High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases
can be released unexpectedly and with extreme force. High pressure systems should be assembled and
operated only by personnel who have been instructed in proper safety practices.
This instrument is not to be operated in any other manner than that specified by the manufacturer.
Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any
form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a
Fluke Company 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA.
DH Instruments makes sincere efforts to ensure accuracy and quality of its published materials; however, no warranty, expressed
or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the
use of the information in this manual or products described in it. Mention of any product or brand does not constitute an
endorsement by DH Instruments of that product or brand. This manual was originally composed in English and was subsequently
translated into other languages. The fidelity of the translation cannot be guaranteed. In case of conflict between the English version
and other language versions, the English version predominates.
DH Instruments, DH, DHI, DH500, GPC1, OPG1, PG7000, PG7202, RPM4 and HPMS are trademarks, registered and otherwise,
of DH Instruments, a Fluke Company.
Swagelok is a registered trademark of Swagelok Company.
Teflon is a registered trademark of 3M Corporation.
Krytox is a registered trademark of the Dupont de Nemours Company.
1.3.1 FRONT PANEL..............................................................................................................................................5
1.3.3 SYSTEM SCHEMATIC ..................................................................................................................................6
2.4.1 SET UP GPC1..............................................................................................................................................10
2.4.2 CONNECT PNEUMATIC POWER (DRIVE AIR) .........................................................................................10
2.4.3 CONNECT HIGH PRESSURE GAS SUPPLY (GB-152-AF).......................................................................11
2.4.4 MAKE TEST PRESSURE INTERCONNECTIONS......................................................................................12
2.4.4.1 CONNECT THE SYSTEM REFERENCE PRESSURE MEASURING DEVICE (RPM4/HPMS
2.4.4.2 CONNECTING TO A DEVICE UNDER TEST..........................................................................................12
2.4.4.3 CLEANLINESS CONSIDERATIONS WHEN CONNECTING DUTS....................................................13
2.5 POWER UP AND VERIFICATION.........................................................................................................15
2.5.1 APPLY THE HIGH PRESSURE SUPPLY...................................................................................................15
2.5.2 ADJUST THE INLET PRESSURE...............................................................................................................15
This manual provides the user with the information necessary to operate a GPC1-10000-AF Gas
Pressure Controller. It also includes a great deal of additional information provided to help you optimize
GPC1 use and take full advantage of its many features and functions.
FOR THOSE OF YOU WHO “DON’T READ MANUALS”, GO DIRECTLY TO SECTION 2.4 TO SET UP YOUR GPC1.
THEN GO TO SECTIONS 2.5.5 and 3.3. THIS WILL GET YOU RUNNING QUICKLY WITH MINIMAL RISK OF CAUSING
DAMAGE TO YOURSELF OR YOUR GPC1. THEN… WHEN YOU HAVE QUESTIONS OR START TO WONDER ABOUT
ALL THE GREAT FEATURES YOU MIGHT BE MISSING, GET INTO THE MANUAL!
GPC1-1000-AF is usually delivered as part of an PGC-10000-AF system which also includes an
RPM4/HPMS A70M/A20M-AF reference pressure monitor and and a GB-152-AF gas booster. The
RPM4/HPMS and the GB-152 have their own Operation and Maintenance Manuals.
Manual Conventions
(Caution) is used throughout the manual to identify user warnings and cautions.
(NOTE) is used throughout the manual to identify operating and applications advice and additional
explanations.
The GPC1-10000-AF Gas Pressure Controller is a stand alone, pressure setting and adjusting
component intended to be used as the means of pressure control in pneumatic calibration and test
systems. GPC1-10000-AF covers the range from atmosphere to 10 000 psi (70 MPa).
GPC1 combines the versatility, speed and reliability of direct operator control with the convenience and
effort-free operation of automation. It is the standard pressure control component in a PGC-10000-AF
Pneumatic Gauge Calibrator as well as in a PG7202 piston gauge system.
The GPC1-10000-AF is typically delivered as part of a PGC-10000-AF Pneumatic Gauge Calibrator. The
PGC-10000-AF system includes a GB-152-AF gas booster and an RPM4/HPMS A70M/A20M that have
their own Operation and Maintenance Manuals.
GPC1 is delivered, along with its standard accessories, in a corrugated container with
corrugated and polyurethane inserts to hold it in place.
Remove GPC1 and its accessories from the shipping container and remove each item from
its protective plastic bag.
Retain the specialized packing and shipping materials in case the GPC1 needs to be
shipped.
2.1.2 INSPECTING CONTENTS
Check that all items are present and have NO visible signs of damage.
Verify the items received against the parts list in Table 1.
Table 1. GPC1-10000-AF Parts List
DESCRIPTION PART #
GPC1-10000-AF instrument 402190
ACCESSORIES:
1 Mat, Top Surface Protection 123481
1 ea.
INTERCONNECTIONS KIT: 402165
2 ea. Nipple, 2.75 in. (70 mm), DH500 100207
1 ea. Nipple, 6 in. (152.4 mm), DH500 100208
1 ea. Nipple, 12 in. (30.5 mm), DH500 100209
1 ea. Elbow, 12 in. (30.5 mm), DH500 123136
1 ea. Adaptor, DH500 F x 1/8 in. NPT M 102819
1 ea. Adaptor, DH500 F x 1/4 in. NPT F 102820
1 ea Adaptor, DH500 F x 1/4 in. NPT M 102889
1 ea Adaptor, DH500 F x AN4 M 102888
3 ea. Plug, DH500 100285
3 ea. Collar, DH500 101201
PGC-10000-AF Documentation Disk including:
• RPM4/HPMS A70M/A20M-AF Operation and
Maintenance Manual, p/n 550136
• GPC1-10000-AF Operation and
Maintenance Manual, p/n 550135
• GB-152-AF Operation and Maintenance
Manual, p/n 550137
GPC1-10000-AF is usually delivered as the pressure generation and control component of a PGC-10000AF Pneumatic Gauge Calibration System (see Figure 4). The PGC-10000-AF system includes:
•RPM4/HPMS A70M/A20M-AF: Reference pressure monitor and high pressure mounting system used
as the pressure measuring reference of the calibration system.
• GPC1-10000-AF: Gas pressure controller used to set and adjust high pressure gas in the calibration
system.
• GB-152-AF: Gas booster package used to supply gas pressure up to 10 000 psi (70 MPa) to the
GPC1-10000-AF pressure controller.
Each of the three components of the PGC-10000-AF system has its own Operation and Maintenance
Manual and individual setup and start up instructions. Figure 4 shows the typical setup configuration of
the complete PGC-10000-AF system.
RPM4/HPMS A70M/A20M Reference Pressure Monitor
RPM4/HPMS A70M/A20M Reference Pressure Monitor
GPC1-10000-AF
GPC1-10000-AF
Gas Pressure Controller
Gas Pressure Control ler
CAUTION
CAUTION
Drive air
Drive air
connection
connection
Remote ENTER
Remote ENTER
Footswitch
Footswitch
GB152-AF
GB152-AF
DriveAir Control Kit
Drive Air Control Kit
GB152-AF
GB152-AF
Gas Booster
Gas Booster
Figure 4. Typical PGC-10000-AF system installation
The GPC1-10000-AF is typically delivered as part of a PGC-10000-AF Pneumatic Gauge Calibrator (see
Section 2.2). The PGC-10000-AF system also includes a GB-152-AF gas booster and an RPM4/HPMS
A70M/A20M that have their own Operation and Maintenance Manuals.
When selecting and preparing a site to setup a GPC1 system, the following should be considered:
•Bench stability: GPC1 weighs about 24 kg (53 lb). The RPM4/HPMS A70M/A20M-AF weighs
about 12 kg (26 lbs). Consider the combined weight of all components, including possible items to be
tested, when selecting a bench.
•Footprint: The PGC-10000-AF system requires a minimum bench space approximately 33 in. (84
cm) wide and 24 in. (60 cm) deep.
•Location of other components: Plan the space required and a convenient layout for the complete
system in which GPC1 is the pressure control component.
• If the GPC1 is to be used with an RPM4/HPMS, the GPC1 accessories include the hardware
necessary for setting up in a standard configuration (see Sections 2.2, 2.4.3, 2.4.4). The
RPM4/HPMS is normally placed to the left of the GPC1 and connected to the TEST2 port.
•DRAIN port: Provide access to the DRAIN port on the right, rear side of the GPC1. This port needs
to be accessed regularly to purge contaminants from GPC1.
•High pressure supply: Plan the connection from the high pressure gas supply to GPC1. If the high
pressure is being supplied by a GB-152-AF gas booster (included in GPC-10000-AF Pneumatic
Gauge Calibrator), interconnecting hardware to connect the booster output to the GPC1 SUPPLY
port is included with the booster (see the GB-152-AF Operation and Maintenance Manual).
•Drive air supply: Plan the PDVV drive air supply. The maximum drive air supply required is 100 psi
(700 kPa) but may be lower depending on the maximum test pressure to be adjusted (see Section
2.4.2, Table 2). The drive air PDVV DRIVE AIR port is on the right, rear side of GPC1. The
connection is 1/4 in. NPT female. This is usually supplied from an N2 or Air “K” bottle.
•Sy
stem interconnections: Plan the interconnections between GPC1 and any other components in
system. Minimizing the volume and maximizing the mass of all interconnecting elements will
the
reduce pressure generation and stabilization time (see Section 2.2).
ALWAYS use external tubing and fittings rated for pressures equal to or greater than the maximum
pressure which GPC1 will be used to control.
DH500 F fittings are delivered with disposable, orange, plastic dummy plugs installed. These are NOT
intended to hold high pressure. They should be removed and replaced with appropriate fittings or stainless
steel plugs before high pressure operation. Each dummy plug carries a DH500 collar. Remove and retain the
collar for use in connecting to the fitting.
Before setting up GPC1, see Section 2.3 for general information on site requirements.
To prepare a GPC1 for check out and operation:
Set up GPC1 (see Section 2.4.1).
Connect drive air (see Section 2.4.2).
Connect the high pressure supply (GB-152-AF) (see Section 2.4.3).
Make test pressure interconnections, including connecting the reference pressure measuring device
(RPM4/HPMS A70M/A20M-AF) (see Section 2.4.4).
2.4.1 SET UP GPC1
To set up GPC1 proceed as follows:
Place GPC1 on the site table in the proper orientation with the front panel controls
conveniently accessible.
Install the mat delivered with the GPC1 accessories on the top, front surface of the
GPC1.
2.4.2 CONNECT PNEUMATIC POWER (DRIVE AIR)
GPC1 requires pneumatic power to drive its pneumatically driven variable volume (PDVV).
The drive air requirements are summarized in Table 2. Since the flow requirements are very
low and cleanliness of the gas is important, the supply is usually regulated Nitrogen or
instrument grade air from a “K” bottle.
Connect the pneumatic pressure source to the 1/4 in. NPT F
connection
DRIVE on the right side of GPC1 housing. Use Teflon™ tape or another thread sealant to
minimize leakage.
GPC1 must be supplied with NON-LUBRICATED drive air. The internal components are
permanently lubricated. The oil in lubricated air can contaminate the small diameter tubing inside
GPC1 and lead to erratic behavior requiring difficult and costly cleaning.
GPC1 requires a high pressure gas supply of 10 000 psi (70 MPa) or lower. If the GPC1 is
part of a PGC-10000-AF Pneumatic Gauge Calibrator, the high gas pressure supply is
provided by a GB-152-AF gas booster. Hardware to connect the booster output to the GPC1
SUPPLY port is supplied with the booster. See the GB-152-AF Operation and Maintenance
Manual for instructions on making the connection using the GB-152-AF interconnections kit.
The high pressure gas supply is connected to the GPC1 SUPPLY port. The SUPPLY port is
a DH500 female (DH500 is equivalent to AE F250C, HIP HF4, etc.).
Do not connect pressure greater than 10 000 psi (70 MPa) to the GPC1 SUPPLY port.
Highly pressurized gas can be extremely hazardous. Before applying pressure to GPC1
and/or the system connected to it, be sure that all pressure vessels and connections are rated
for the pressure levels that will be applied and that all connections have been properly tightened
(see Section 2.5.5). Ensure that the GPC1 TEST INLET SET regulator is fully backed off and its
INLET valve is closed (see Section 2.5.1).
DH500 F fittings are delivered with disposable, orange, plastic dummy plugs installed.
These are NOT intended to hold high pressure. They should be removed and replaced with
appropriate fittings or stainless steel plugs before high pressure operation. Each dummy plug
carries a DH500 collar. Remove and retain the collar for use in connecting to the fitting.
2.4.4.1 CONNECT THE SYSTEM REFERENCE PRESSURE
MEASURING DEVICE (RPM4/HPMS A70M/A20M-AF)
GPC1-10000-AF is delivered with an interconnections kit (see Section 2.1.2,
Table 1). This kit includes a 12 in. (305 mm) DH500 elbow intended to connect
GPC1 to an RPM4/HPMS A70M/A20M-AF reference pressure monitor which is
included
in the PGC-10000-AF
the recommended layout. The setup assumes that one of the TEST ports on the
top of GPC1 or an open leg of the interconnecting tee will be used to connect to
the device or system under test.
Pneumatic Gauge Calibrator. See Figure 5 for
1.
RPM4/HPMS TEST port
2. 12 in. DH500 elbow (in GPC1 interconnections kit) 6.
3.
GPC1 TEST2 port
4. GCP1-10000-AF
Figure 5. Connecting GPC1-10000-AF to RPM4/HPMS A70M/A20M-AF
5.
GPC1 TEST1 port
GPC1 TEST3 port
7. RPM4 A70M/A20M-AF
2.4.4.2 CONNECTING TO A DEVICE UNDER TEST
In a PGC-10000-AF system, the device under test (DUT) is intended to be
connected to one of the TEST connections on the top surface of the GPC1. See
Section 2.4.4.3 concerning cleanliness considerations before connecting a DUT.
The TEST connections on the top of the GPC1 are DH500 F (DH500 is a gland
and collar type fitting for 1/4 in. (6 mm) coned and left hand threaded tube.
DH500 is equivalent to AE F250C, HIP HF4, etc.).
The PGC-10000-AF fittings accessory kit includes adaptors to convert the DH500 F
TEST connection to other commonly used fittings. The adaptors are made by
combining a DH500 F adaptor with a 2.75 in., 6 in. or 12 in. DH500 nipple. The
nipple/adaptor assembly is then
installed on the DUT. Finally, the
nipple/adaptor/DUT assembly is
installed on the GPC1’s DH500 F TEST
connection. Note that the gland nut on
the DH500 nipple assembly can be
Connection to DUT
Connection to DUT
Adaptor, DH500 F to
Adaptor, DH500 F to
1/4 in. M, 1/4 in. F,
1/4 in. M, 1/4 in. F,
1/8 in. M, AN4 M
1/8 in. M, AN4 M
or other
or other
tightened into the DH500 F connection
without rotating the nipple or DUT.
Adaptors included in the GPC1
accessory kit are:
•1/4 in. NPT F
DH500 nipple with
DH500 nipple with
glands and collars
glands and collars
installed
installed
• 1/4 in. NPT M
GPC1 TEST port
GPC1 TEST port
• 1/8 in. NPT M
• 37 degree flare M (AN4 M)
Figure 6. Adapting TEST port to connect a
device under test
Highly pressurized gas can be extremely hazardous. Before applying pressure
to GPC1 and/or the system connected to it, be sure that all pressure vessels and
connections are rated for the pressure levels that will be applied and that all
connections have been properly tightened (see Section 2.5.5).
2.4.4.3 CLEANLINESS CONSIDERATIONS WHEN CONNECTING DUTS
Special design features are included in GPC1 to avoid excessive contamination
of GPC1 if liquids should return from a DUT to which it is connected.
For this purpose, GPC1 is equipped with an inclined manifold that serves as a
liquid sump (see Figure 77). A DRAIN port is provided at the low point so that
the sump can be easily purged. The TEST ports all go directly through
so that any liquids returning from the system under test will collect there rather
than being carried throughout GPC1. The top, rear TEST1 port is supplied
directly from the
SUPPLY port so that it is always filled with clean gas from the
supply. Even if liquids are present in the sump, they will not enter the TEST1
port as gas that may have been exposed to liquids never flows into the port from
GPC1
(see Figure 77).
the sump
Below are recommendations for use of the three (3) GPC1 TEST
If there is no risk of return of
liquids from the devices that will be connected to
ports.
GPC1, it is not necessary to discriminate TEST port usage.
•TEST1 port(top, rear): This port is supplied directly with clean gas from the
SUPPLY port and should be reserved for connecting devices that are known
to be liquid free and must be protected from any risk of liquid contamination.
If no such devices will be connected to GPC1, then this port may be used as
any TEST port would.
•TEST2 port (left lateral): Normally, the system reference pressure
measurement device is connected here. In a PGC-10000-AF Pneumatic
Gauge Calibrator, this is an RPM4/HPMS A70M/A20M-AF.
• TEST3 port (top, front): This port is connected to the lowest point on the GPC1
sump and should be used for connecting test devices that may contain liquids.
By design, the TEST1 port is always filled directly with clean gas from the
SUPPLY port and exhausted away from the port. Do not break the TEST1 port
connection under pressure. If unclean gas is present in GPC1, flowing out the TEST1
port will contaminate the port.
1. High pressure gas SUPPLY connection 5. TEST3 port (top, front)
This section assumes that the GPC1 system has already been set up, including pressure
interconnection (see Section 2.4.1).
Highly pressurized gas can be extremely hazardous. Before applying pressure to GPC1
and/or the system connected to it, be sure that all pressure vessels and connections are rated
for the pressure levels that will be applied and that all connections have been properly tightened
(see Section 2.5.5). Ensure that the GPC1 TEST INLET SET regulator is fully backed off and the
INLET valve is closed (see Section 2.4, 2.5.1).
Do not connect pressure greater than 10 000 psi (70 MPa) to the GPC1 SUPPLY port.
Proceed as follows (numerical references refer to Section 3.1, Figure 88):
Fully back off the TEST INLET SET regulator (5).
Close the TEST INLET valve (12).
Open the TEST OUTLET valve (15).
Apply the high pressure supply to the SUPPLY port (1).
2.5.2 ADJUST THE INLET PRESSURE
This section assumes that the GPC1 system has already been set up, including
pressure interconnection (see Section 2.4.1).
Be sure the INLET valve is CLOSED before adjusting the TEST INLET SET regulator.
If the INLET valve is open, the supply pressure will be admitted to GPC1 components and
TEST ports.
Turn the TEST INLET SET regulator clockwise while observing the TEST INLET gauge.
Set the pressure as indicated by the TEST INLET gauge to the desired maximum
test pressure. The pressure set by the TEST INLET SET regulator is applied to the inlet of
the INLET valve.
This section assumes that the GPC1 system has already been set up, including pressure
interconnections (see Section 2.4.1).
Apply drive pressure to the PDVV DRIVE port. See Table 2 to determine the necessary
PDVV drive pressure value.
2.5.4 CHECK OPERATION OF COMPONENTS
Highly pressurized gas can be extremely hazardous. Before applying pressure to the GPC1
and/or the system connected to it, be sure that all pressure vessels and connections are rated
for the pressure levels that will be applied and that all connections have been properly tightened
(see Section 2.4, 2.5.5).
When the GPC1 INLET valve is opened, the SUPPLY pressure may be applied to the test
system rapidly. Before operating the INLET valve, ALWAYS adjust the TEST INLET SET regulator
pressure low enough so that the SUPPLY pressure does not exceed the maximum pressure rating
of the devices or system to which GPC1 is connected (see Sections 2.5.2 and 3.2.1).
Proceed as follows:
If an RPM4 A70M/A20M-AF is not already connected, connect a high pressure indicating
device to one of GPC1’s TEST ports (see Section 3.2.4). Plug all other TEST ports using
DH500 plugs.
There are three TEST ports: One on the left, rear side and two on the top (see Section
2.4.4.2).
Fully close the OUTLET valve.
Slowly open the INLET valve.
The pressure indicated by the reference and/or device under test should begin to
increase. If the pressure does not increase, possible explanations are:
• The TEST INLET SET regulator has not been properly adjusted (see Section 2.4.2).
• There is no high pressure supply (see Section 2.4.3).
• There is a large leak in the system to which GPC1 is connected or in GPC1 itself.
Keep the INLET valve open until the desired gas pressure is set.
Fully close the INLET valve.
Leak Check: The pressure indicated by the high pressure device connected to the
TEST port should stabilize and hold. If it does not, there is a leak in the system to which
GPC1 is connected or in GPC1 itself.
The time required for pressure to stabilize after the pressure has been changed is directly
proportional to the volume connected to GPC1, to the magnitude of the pressure change and to
the mechanical stability of the volume's connections and vessels. It may take up to 10 minutes to
stabilize pressure well enough to perform a valid leak test. To reduce stabilization time, go beyond
the pressure set point and return. If in doubt as to the validity of a leak test, consider running
the leak test overnight to observe the change in pressure over a very long time period. If the GPC1
is part of a PGC-10000-AF Pneumatic Gauge Calibrator, the RPM4/HPMS A70M/A20M-AF leak
test function can be used (see the RPM4/HPMS Operation and Maintenance Manual).
When leak checking is complete, slowly open the OUTLET valve to reduce pressure and
vent to atmosphere.
2.5.5 PRECAUTIONS TO TAKE BEFORE WORKING WITH HIGH
PRESSURE GAS / SAFETY CONSIDERATIONS
Highly pressurized gas can be extremely hazardous if proper procedures are not followed or
incorrect hardware is used. Before using GPC1 to set and adjust pressure, consider
the following:
• Double check that all connections, vessels and DUTs connected to GPC1 are rated for
the pressure to be set and that all fittings are properly tightened.
• Opening the INLET valve opens to the high pressure gas supply. To avoid accidental
overpressure of the any item connected to the GPC1, BEFORE opening the
INLET valve, ALWAYS adjust the TEST INLET SET regulator so that the supply to the
INLET valve is lower than the maximum pressure that is intended to be set with the
GPC1 (see Section 2.4.2).
• At high pressure, the
and push button PDVV valves increase pressure much more
quickly than at low pressure. Observe pressure evolution carefully when operating these
valves (see Section 3.2.3).
Drain/purge the GPC1 sump regularly to remove any contaminants that may
•
have
entered the system from the supply gas or devices connected to GPC1 (see Section 4.2).
•Put the PDVV plunger in the START position when starting a calibration or test sequence
(see Section 3.2.3).
• Systems and DUTs connected to GPC1 should be emptied of liquids before they are
pressurized (see Section 3.2.5, 4.2).
When leaving GPC1 at rest but still setup for operation:
Fully close the INLET valve.
Release gas pressure by fully opening the OUTLET valve.
Open the DRAIN port.
Release the high pressure supply and fully back off the TEST INLET SET regulator.
To prepare GPC1 for long term storage or shipping:
Disconnect all pneumatic pressure connections and plug the DH500 connections using DH500 plugs
or orange dummy plugs held by gland nuts. Plug the 1/4 in. NPT port with a plastic plug.
When shipping GPC1, use the original shipping materials, if possible. If it is necessary to use alternate
materials, use caution and ensure that: a) the front panel controls and indicators are protected; and, b) the
tubing and components exposed through GPC1’s open bottom are protected. GPC1 must ride on its four (4)
feet - NOT on its internal components.
Numerical references in this section refer to Section 3.1, Figure 88.
GPC1 is a self-contained system designed to set and adjust gas pressure in static pressure test and
calibration systems. GPC1-10000-AF operates to 10 000 psi (70 MPa). GPC1 combines the capability to
execute large pressure changes very quickly with very fine pressure adjustment.
GPC1 uses two different techniques to set and adjust pressure. These are rough pressure control using
the TEST INLET and TEST OUTLET valves (12, 15) and fine pressure control using the PDVV (+) and (-)
valves (13, 14).
The first means of setting and adjusting pressure uses the external gas pressure supply (1) with the
TEST INLET SET regulator (5), TEST INLET valve (12) and TEST OUTLET valve (15). This combination
is used for filling the system under test, making large pressure changes and for rough pressure control.
The valves are Belleville spring loaded, half-turn needle valves. Their operation is highly progressive
over a half-turn with mechanical stops at each end so they cannot be over tightened. The regulator is self
venting and its output is indicated by the TEST INLET gauge (4). The valve is turned clockwise (CW) to
close and counter-clockwise (CCW) to open. A WHITE dot on the handle body indicates the valve’s
current open/close position. The TEST INLET SET regulator (5) and TEST INLET gauge (4) are used to
set the supply pressure to the TEST INLET valve (12). Opening the INLET valve (12) allows the supply
pressure to enter GPC1 and reach the TEST ports (6,7,8). Opening the OUTLET valve (15) exhausts
gas, reducing pressure in the system.
The second means of generating and adjusting pressure is the Pneumatically Driven Variable Volume
(PDVV) (16) combined with the PDVV (+) and (-) valves (13, 14). This combination is used for smaller
pressure changes and fine pressure control. The PDVV is a pneumatically actuated variable volume. A
piston or plunger in a cylinder is exposed to the high pressure gas to be adjusted.
The other end of the plunger is connected to a dome loaded pneumatic actuator. Changing the
pneumatic pressure on the dome loaded actuator causes the plunger to move, increasing or decreasing
the high gas pressure. A spring returns the plunger to its minimum stroke position when there is no
pressure on the dome or on the plunger. A mechanical system tracks movement of the plunger and an
indicator (18) displays the plunger position on the front panel. The PDVV (+) and (-) valves (13, 14) are
momentary, poppet valves that open when pressed. The (+) valves (13) admit drive air pressure to the
PDVV actuator causing the PDVV piston to move forward, compressing the high pressure gas and
increasing the pressure. Th e (-) valves (14) have the opposite effect, causing pressure to decrease when
they are operated.
All GPC1 operational functions are accessed from the instrument front panel. Sections 3.2.1 to 3.2.5
detail the various functions.
1. PDVV drive air/test gas pressure
gauge
2. PDVV piston position indicator
3. Test inlet pressure gauge
4. Test inlet pressure regulator
5. Test inlet valve knob
6. PDVV increase fast and slow
buttons
7. PDVV decrease fast and slow
buttons
8. Test outlet valve knob
Figure 9. Front panel view
3.2.1 SETTING INLET SUPPLY PRESSURE, TEST INLET SET
REGULATOR ADJUSTMENT
Numerical references in this section refer to Section 3.2, Figure 99. For information on the
GPC1 operating principle, see Section 3.1.
Setting inlet supply pressure is generally done at the beginning of a test or calibration based
on the maximum pressure of the calibration. To avoid accidental overpressure, it is good
practice to set the inlet pressure just below the maximum pressure desired. The PDVV can
then be used for the final pressure adjustment at the maximum pressure (see Section 3.2.3).
With the INLET valve (5) closed, use the INLET SET regulator (4) and
the INLET gauge (3)
indication to set the maximum desired test pressure.
The TEST INLET SET regulator sets the pressure to the TEST INLET valve. When the TEST
INLET valve is opened, this pressure can be generated rapidly in the system connected
to GPC1. Use caution in setting the TEST INLET regulator pressure and always check the setting
and adjust if necessary before using the TEST INLET valve (see Section 2.4.2).
3.2.2 ROUGH PRESSURE GENERATION/CONTROL, INLET
AND OUTLET VALVE OPERATION
Numerical references in this section refer to Section 3.2, Figure 99. For information on the
GPC1 operating principle, see Section 3.1.
The INLET and OUTLET valves (5, 8) are used to execute large pressure changes in the test
system and for rough pressure control. The INLET valve is used to increase pressure and the
OUTLET valve decreases pressure and vents the system to atmosphere, setting zero gauge
pressure. If finer pressure control is needed, use the PDVV valves (see Section 3.2.3).
To increase pressure in the GPC1 system, open the INLET valve (5) slowly. Use the
progressive nature of the valve to control the rate of pressure increase. Close the valve when the
desired pressure has been reached. When a gas booster is used to supply high pressure, the
booster may not be able to keep up with the flow rate needed to set the desired pressure. In this
case, with the INLET valve open, wait for the booster to reach the desired pressure.
To decrease pressure in the GPC1 system, open OUTLET valve (8) slowly. Open the valve
fully to vent the system to atmosphere (set zero gauge).
The TEST INLET valve connects the pressure supply to the test system. When the TEST
INLET valve is opened, high pressure can be generated rapidly in the system connected to GPC1.
Use caution when opening the TEST INLET valve and always check the TEST INLET pressure gauge
to know the supply pressure before doing so (see Section 2.4.2).
3.2.3 FINE PRESSURE ADJUSTMENT, PDVV (+) AND (-)
VALVE OPERATION
Numerical references in this section refer to Section 3.2, Figure 99 except where
specified otherwise. For information on the GPC1 operating principle, see Section 3.1.
Use the valves labeled
plunger to back off and pressure to decrease. Use the valves labeled
and to release gas from the PDVV actuator, causing the PDVV
are to admit gas
to the PDVV actuator, causing the PDVV plunger to move forward and pressure to increase.
The
and valves are for high speed PDVV operation. The and valves are for slow speed
PDVV operation.
The PDVV (+) and (-) valves (6, 7) are utilized to make small pressure changes and for fine
pressure control. Brief momentary action on the
and valves is used to bump or jog
pressure in very small amounts around a pressure point.
If the PDVV plunger reaches end of stroke during a calibration or test, use the INLET valve and/or
OUTLET valve (5, 8) to increase or decrease the pressure, as needed (see Section 3.2.2).
The actual rate of pressure change caused by the PDVV (+) and (-) valves is dependent on the
test volume that is connected to GPC1 and the current pressure value. Increasing the test
volume lowers the pressure rate of change and pressure step size. Increasing the volume
increases the rate and the pressure step size. The maximum pressure that can be generated by
the PDVV (+) valves is dependent on the PDVV drive air supply (see Section 2.4.2, Table 2).
position of the PDVV plunger is indicated
The
by the PDVV POSITION indicator (2).
The
RED index (Figure 10, Ref 4) on the
START
indicator tracks the movement of the PDVV
plunger. Minimum and maximum end of
stroke positions (Figure 10, Refs 3 and 1) as
well as a recommended start position
(Figure 10, Ref 2) are indicated. The full
stroke displacement of the GPC1 PDVV
plunger from maximum to minimum end of
stroke is 2 cc (0.12 in.
The current drive air pressure on the PDVV actuator and approximate corresponding gas test
pressure are indicated by the PDVV DRIVE/TEST gauge (1). The gas test pressure
indication is highly approximate and only valid when the PDVV plunger is NOT at an end of
stroke position.
For the PDVV (+) and (-) valves (6, 7) to have an effect, the PDVV plunger must have stroke
available. If the PDVV is at its end of stroke position (Figure 10, Refs 1 and 3), the plunger
cannot move to change pressure. The recommended PDVV START position (Figure 10, Ref
2) puts the plunger at the middle of its stroke so 50 % of PDVV displacement is available in
either direction. The PDVV plunger can be positioned without affecting test pressure using
and valves when the OUTLET valve (8) is open (pressure vented). The plunger is
the
returned to minimum end of stroke position by a spring. The PDVV plunger is usually set to
the desired position at the start of a calibration or test.
The PDVV (+) valves generate pressure indefinitely when opened. Particularly when
operating at very high pressure, use caution when operating these valves so that they do not
generate more pressure than is desired.
3.2.4 CONNECTING A DEVICE UNDER TEST
The device to be tested or calibrated should be connected either to a TEST port configured on
the interconnections external to GPC1 or to one of GPC1’s top TEST ports (see Section 2.4.4.2).
The test connection is a DH500 F (DH500 is a gland and collar type fitting for 1/4 in. (6 mm)
coned and left hand threaded tube. DH500 is equivalent to AE F250C, HIP HF4, etc.).
The DH500 test connection can be converted to 1/8 in. NPT M, 1/4 in. NPT F, 1/4 in. NPTM
or AN4 M using the 2.75 in. (70 mm) tube and DH500 F X 1/8 in. NPT M or DH500 F x 1/4 in.
NPT F adaptor supplied with GPC1 accessories. Install the tube into the adaptor. Then
install that adaptor/tube assembly onto the DH500 F TEST port (see Section 2.4.4.2).
GPC1 covers a very wide range of pressure up to 10 000 psi (70 MPa). It is the user’s
responsibility to ensure that fittings and devices connected to GPC1 are rated for the pressures
at which they will be used.
By design, TEST1 port is always filled directly with clean gas from the SUPPLY port and
exhausted away from the port. Do not break the TEST1 port connection under pressure as, if
unclean gas is present in GPC1, this could cause it to flow to the TEST1 port.
3.2.5 PURGING LIQUIDS FROM THE DUT/SYSTEM UNDER TEST
For information on the GPC1 operating principle, see Section 3.1.
GPC1 includes a sump to collect liquids that may return from the device or system under test to
which it is connected. However, the amount of liquid that the sump can collect without liquids
entering other GPC1 internal circuitry is limited. Excessive fluids in GPC1 and test connections
can cause erratic pressure control and introduce unexpected uncertainty in measurements.
DUTs and the system under test should be cleaned of liquids to the extent reasonably possible
before being connected to GPC1. Also, see Section 2.4.4.3 for information about the appropriate
GPC1 TEST port connection to use.
The procedure to purge the GPC1 sump and/or a DUT connected to GPC1 is:
Use GPC1 to pressurize the system, including the DUT, to approximately 500 psi (3.5 MPa)
(or maximum pressure of the DUT if less than 500 psi).
Open DRAIN port. Use the 5/8 in. open end wrench supplied in the GPC1 accessories to slowly
and then more fully open the DRAIN port allowing gas to exhaust as quickly as is safe and practical.
Observe whether the gas coming out of the DRAIN port contains liquid or liquid vapor.
Repeat steps through until there is no evidence of liquid in the gas escaping from the
DRAIN port.
3.3 TYPICAL OPERATING SEQUENCE FOR A COMPLETE
CALIBRATION OR TEST
GPC1 is most often used to set and adjust pressure to a reference measuring device and a DUT when
performing a test or calibration. If the GPC1 is part of a PGC-10000-AF Pneumatic Gauge Calibrator, the
reference measurement device is an RPM4/HPMS A70M/A20M. The typical operational sequence is as
follows:
Connect the DUT to the appropriate GPC1 TEST port or to a test port on the external system to
which GPC1 is connected (see Sections 3.2.4, 2.4.4.2).
Set the TEST INLET SET regulator (see Section 3.2.1)
Position the PDVV plunger (see Section 3.2.3).
Purge the DUT (if necessary) (see Section 3.2 5).
Take the starting zero reading on the DUT: With the OUTLET valve open, and the INLET valve
closed, the pressure in the test system is zero gauge.
Set ascending test pressures: Carefully open the INLET valve and control the gas input to set the
pressure in the test system just under the desired test point (see Section 3.2.2). Pause a moment.
Then use the PDVV (+)and/or (-) valves to adjust the pressure to the exact test pressure desired or, if
the reference is a piston gauge, to float the piston gauge piston (see Section 3.2.3). Repeat this
process for all of the ascending increments. If the increments are small enough for the PDVV
displacement to generate the pressure, only the PDVV (+) valves may be needed to reach the next
pressure. If the PDVV runs out of stroke, use the INLET valve to generate pressure and reposition
the PDVV plunger.
Set descending test pressures: Very carefully open the OUTLET valve and control the gas
exhaust to set pressure in the test system just over the desired test point (see Section 3.2.2). Then
use the PDVV (+) and/or (-) valves to adjust the pressure to the exact test pressure desired or, if the
reference is a piston gauge, to float the piston gauge piston (see Section 3.2.3). Repeat this process
for all of the descending increments. If the increments are small enough for the PDVV displacement
to generate the pressure, only the PDVV (-) valves may be needed to generate the next pressure. If
the PDVV runs out of stroke, use the OUTLET valve to reduce pressure.
Vent the system and disconnect the DUT: Open the OUTLET valve fully and check that the DUT
GPC1 was designed for maintenance free operation. The PDVV is permanently lubricated. No
maintenance is required other than:
• Purge the sump very regularly (see Section 4.2).
• Clean/replace the PDVV driv
contaminated and restrict the free flow of pressure. It should then be cleaned or replaced
(see Section 4.3).
Maintenance and repair services for GPC1 are offered by DHI Authorized Service Providers (see Section
6.2, Table 6).
GPC1 is a sophisticated pressure setting and adjusting instrument with advanced features and
functions. Before assuming that unexpected behavior is caused by a system defect or breakdown, use this
manual and other training and troubleshooting facilities to become thoroughly familiar with GPC1 operation.
For rapid troubleshooting assistance in specific situations, see Section 0.
e air filter element when needed:The drive air filter may become
GPC1 is covered by a limited 1 year warranty (see Section 6.2). Unauthorized service or repair during the
warranty period is undertaken at the owner's risk and may cause damage that is NOT covered under product
warranty and/or may void the product warranty.
The GPC1 sump (see Section 2.4.4.3, Figure 7) is designed to collect liquids that may be returned from
the pressure supply or system/device under test so that they do not contaminate the rest of the system.
The sump has a limited volume so it should be drained regularly as part of normal operation. The purge
process below should also be used when a DUT is connected that is known to contain liquids (see
Section 3.2.5). The procedure to purge the GPC1 sump and/or a DUT connected to GPC1 is:
Use the GPC1 to pressurize the system, including the DUT, to approximately 500 psi (3.5 MPa) (do
not exceed the pressure rating of the system or the DUT connected to GPC1).
Open the DRAIN port (see Figure 111). Use the 5/8 in. open end wrench supplied in the GPC1
accessories to slowly and then more fully open the DRAIN port allowing gas to exhaust as quickly as
is safe and practical.
Observe whether the gas coming out of the DRAIN port contains liquid or liquid vapor.
Repeat steps through until there is no evidence of liquid in the gas that vents through the DRAIN
port.
Figure 11. Drain port location
4.3 CLEANING/REPLACING PDVV DRIVE AIR FILTER ELEMENT
There is a filter on the PDVV DRIVE port. If the drive air supplied is excessively dirty, this filter may
become excessively dirty and restrict air flow to the PDVV actuator (see Section 3.1, Figure 88).
The drive air filter is a filter body with a
be removed from GPC1.
To remove and reinstall the drive air filter, proceed as follows (numerical references in this section
refer to Figure 122):
Place GPC1 on the bench, so that its front panel is up with its open bottom is facing you.
Disconnect the downstream filter connection fitting (2) and move the 1/4 in. PFA flexible tubing (1)
away from the filter body (3). Then disconnect the upstream filter connection (4) and remove the filter
body (3).
To reinstall the filter, make the upstream filter connection (4). Then make the downstream filter
connection (2). Use caution to ensure that the filter body (3) is oriented in the correct direction
(the arrow on the filter body should be pointing in the direction of flow in from the PDVV DRIVE port).
sintered element. To clean or replace the filter the filter body must
GPC1 is a sophisticated pressuring setting and adjusting instrument with advanced features and functions.
Before assuming that unexpected behavior is caused by a system defect or breakdown, the operator should
use this manual and other training facilities to become thoroughly familiar with GPC1 operation. This
troubleshooting guide is intended as an aid in identifying the cause of unexpected GPC1 behavior and
determining whether the behavior is due to normal operation or an internal or external problem.
Identify the symptom or unexpected behavior you are observing from the SYMPTOMS listed in Table 3.
A PROBABLECAUSE is provided and a SOLUTION is proposed including references to manual
sections that provide information that may be of assistance.
Table 5. GPC1 troubleshooting checklist
SYMPTOM PROBABLE CAUSE SOLUTION
Test pressure continuously increases
even with all valves closed.
Test pressure continuously decreases
even with all valves closed.
Test pressure takes too long to
stabilize or will never stabilize.
Test pressure takes too long to
stabilize or will never stabilize.
Test pressure takes too long to
stabilize or will never stabilize.
PDVV will not increase pressure.
PDVV will not decrease pressure. PDVV is at minimum end of stroke
Opening INLET valve does not
increase pressure.
Leak in INLET valve or leak in PDVV (+) valve(s).
Leak in OUTLET valve, leak in PDVV
(-) valve(s), leak in test system
connected to GPC1 or internal leak in
GPC1 high pressure gas system.
You are observing normal evolution
of pressure in an uncontrolled static
volume.
Leak in GPC1 or test system
connected to GPC1.
GPC1 and/or test system tubing is
contaminated with liquids that are
“plugging” tubes.
PDVV is at maximum end of stroke
position, PDVV drive air supply
pressure is not high enough, or
PDVV drive air supply is plugged.
position.
TEST INLET SET regulator is set too
low and/or external pressure supply
to low.
Isolate leak to INLET valve or PDVV (+)
valve(s) by checking whether pressure
continues to increase when PDVV is at
maximum end of stoke. Replace or repair
valve(s) if qualified to do so. 3.1, 3.2.2, 3.2.3.
Identify and correct leak in test system if
present. Disconnect from test system and
plug GPC1 TEST ports to test GPC1 alone.
Isolate leak to OUTLET valve or PDVV (-)
valve(s) by checking if pressure continues to
decrease when PDVV is in minimum end of
stroke position. Replace or repair valve(s) if
qualified to do so. 3.1, 3.2.2, 3.2.3
Reduce resolution of pressure reading to
appropriate level. Reduce test volume.
Increase stability of test tubing and vessels.
Wait longer for stability. Overshoot test point
and return to reduce stabilization time.
See troubleshooting tips “Test pressure
continuously increases…” and “Test pressure
continuously decreases…” above.
Thoroughly purge complete system.
3.2.5, 4.2
Verify PDVV piston position and readjust if
necessary. Use INLET valve to increase
pressure. Increase PDVV drive air supply
pressure. Clean filter. 3.2.3, 2.4.2, 4.3
Verify PDVV piston position and readjust if
necessary. Use OUTLET valve to decrease
pressure. 3.2.3, 3.2.2
Check value of supply pressure on TEST INLET gauge. Adjust INLET regulator,
increase supply pressure if necessary. 3.2.1,
, Fast ( ) and slow ( ), PDVV (-) valves. Used to decrease pressure and for fine
, Fast ( ) and slow ( ), PDVV (+) valves. Used to increase pressure and for fine
collar
CCW
CW
DH500
DUT
gland
PDVV (Pneumatically
Driven Variable Volume)
PDVV (+) valves
PDVV (-) valves
pressure adjustment.
pressure adjustment.
The DH500 fitting element that is threaded onto the tube and provides a surface for the
gland to push against.
Counter-clockwise
Clockwise
High pressure, gland and collar type fitting for 1/4 in. (6 mm) coned and left hand
threaded, stainless steel tubes. DH500 is equivalent to AE F250C, HIP HF4, etc.
Device or System Under Test. The device that is connected to GPC1 to be tested or
calibrated.
The “jam nut” in a DH500 fitting that pushes the collar on the tube into the seat.
A pneumatically actuated plunger in a cylinder used to increase and decrease the
volume of the high pressure gas test system and provide fine adjustment of the
test pressure.
Momentary, push button actuated, poppet valves that admit drive air drive pressure to
the PDVV actuator causing the PDVV plunger to move forward, compressing the high
pressure gas and increasing the test pressure. Used to increase pressure and for fine
pressure adjustment.
Momentary, push button actuated, poppet valves that release air drive pressure from the
PDVV actuator causing the PDVV plunger to move back, decompressing the high
pressure gas and decreasing the test pressure. Used to decrease pressure and for fine
pressure adjustment.
Analog gauge that indicates the PDVV actuator air pressure and the approximate
corresponding gas test pressure.
Analog gauge that indicates the pressure set by the TEST INLET SET regulator and
applied to the TEST INLET valve.
Progressive, half-turn, needle valve used to admit high pressure gas into the test
system. Used for rough pressure adjustment.
Self venting regulator used to regulate the external high pressure gas supply.
Sets maximum TEST INLET valve pressure.
Progressive, half-turn, needle valve used to return exhaust gas from the test system.
Used to release pressure and for rough pressure adjustment.
The high gas pressure in GPC1 PDVV, at its TEST connections and in the system to
which GPC1 is connected.
Page 40
GPC1-10000-AF™ OPERATION AND MAINTENANCE MANUAL
6.2WARRANTY STATEMENT
Except to the extent limited or otherwise provided herein, DH Instruments (DHI) warrants for one year
from purchase, each new product sold by it or one of its authorized distributors, only against defects in
workmanship and/or materials under normal service and use. Products which have been changed or
altered in any manner from their original design, or which are improperly or defectively installed, serviced
or used are not covered by this warranty.
DHI and any of its authorized service providers’ obligations with respect to this warranty are limited to the
repair or replacement of defective products after their inspection and verification of such defects. All
products to be considered for repair or replacement are to be returned to DHI, or its authorized service
provider, freight prepaid, after receiving authorization from DHI or its authorized service provider. The
buyer assumes all liability vis-à-vis third parties in respect to its acts or omissions involving use of the
products. In no event shall DHI be liable to purchaser or any party for any unforeseeable or indirect
damage, it being expressly stated that, for the purpose of this warranty, such indirect damage includes,
but is not limited to, loss of production, profits, revenue, or goodwill, even if DHI has been advised of the
possibility thereof, and regardless of whether such products are used individually or as components in
other products.
Items returned to DHI under warranty claim but determined to not have a defect covered under warranty
or to not have a defect at all are subject to an evaluation charge as well as applicable repair and/or
calibration costs.
The provisions of this warranty and limitation may not be modified in any respect except in writing signed
by a duly authorized officer of DHI.
The above warranty and the obligations and liability of DHI and its authorized service providers exclude
any other warranties or liabilities of any kind.
Table 6. DHI Authorized Service Providers
DH INSTRUMENTS, A FLUKE COMPANY
AUTHORIZED SERVICE PROVIDERS
COMPANY
DH Instruments, a Fluke
Company
Minerva Meettechniek B.V. Chrysantstraat 1
Ohte Giken, Inc.
Technology Center
4765 East Beautiful Lane
Phoenix AZ 85044-5318
USA