e-mail: info@omega.de
United Kingdom:One Omega Drive, River Bend Technology Centre
ISO 9002 CertifiedNorthbank, Irlam, Manchester
M44 5EX, England
Tel: 44 (161) 777-6611FAX: 44 (161) 777-6622
Toll Free in the United Kingdom: 0800-488-488
e-mail: info@omega.co.uk
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of
its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
This section outlines the models covered and the organization of this manual.
The following performance limitations may inhibit efficient or safe operation. Critical
applications should have appropriate diagnostic and backup systems in place.
Pressure transmitters contain an internal fill fluid. It is used to transmit the process pressure
through the isolating diaphragms to the pressure sensing element. In rare cases, oil leak
paths in oil-filled pressure transmitters can be created. Possible causes include: physical
damage to the isolator diaphragms, process fluid freezing, isolator corrosion due to an
incompatible process fluid, etc.
A transmitter with an oil fill fluid leak can continue to perform normally for a period of time.
Sustained oil loss will eventually cause one or more of the operating parameters to exceed
published specifications while a small drift in operating point output continues. Symptoms of
advanced oil loss and other unrelated problems include:
Sustained drift rate in true zero and span or operating point output or both
n
Sluggish response to increasing or decreasing pressure or both
n
Limited output rate or very nonlinear output or both
n
Change in output process noise
n
Noticeable drift in operating point output
n
Abrupt increase in drift rate of true zero or span or both
n
Unstable output
n
Output saturated high or low
n
EN
MODELSCOVERED
This manual provides basic installation, commissioning, and troubleshooting
information for the following PX750
Model PX750 - Differential Pressure Transmitter
measures differential pressure from 2 inH
Model PX750 - Gage Pressure Transmitter
measures gage pressure from 2 inH
Pressure Transmitters:
O to 1,000 psi (0.497 to 6895 kPa).
2
O to 1,000 psi (0.497 to 41369 kPa).
2
1-1
EN
Model PX750– Alphaline Draft Range Differential Pressure Transmitter
designed for monitoring low pressure flow rates with positive and/or negative static
pressure capabilities and 0–½ to 0–6 inH
O rangeability.
2
USINGTHISMANUAL
This manual is designed to assist in basic installation and operation of Model PX750
Pressure Transmitters.
Section 2 Installation
provides a flowchart outlining installation procedures and installation wiring
diagrams.
Section 3 Commissioning
provides a description of common commissioning tasks for the Model PX750 Smart
Pressure Transmitter.
Section 4 Commissioning
provides a description of common commissioning tasks for the Model PX750 Analog
Pressure Transmitter.
Section 5 Troubleshooting
provides basic troubleshooting techniques for common diagnostic messages
associated with the transmitter and the communicator.
Section 6 Reference Data
provides range tables, a typical model structure, and bolt torque specifications for
Model PX750 Transmitters.
Appendix
contains menu tree and fast key sequence for the HART Communicator.
1-2
SECTION
2
Installation
OVERVIEW
This section contains a flowchart in Figure 2-1 and wiring diagrams in Figures 2-2
through 2-5 to guide you to a successful Model PX750 installation. Shielded cable
should be used for best results in electrically noisy environments.
Failure to follow safe installation guidelines can cause death or serious injury. Please
review the following safety messages before installing a Model PX750 Pressure
Transmitter.
To avoid output shifts in critical applications, do not plug the low side with a solid plug.
■
To avoid process leaks, install and tighten all four flange bolts before applying pressure, or
■
process leakage may result. Attempting to remove the flange bolts while the transmitter is in
service may cause process fluid leaks.
To avoid explosions, do not remove the instrument cover or make electrical connections in
■
explosive atmospheres when the circuit is alive. Make sure the instrument is installed in
accordance with intrinsically safe or nonincendive field wiring practice.
To meet explosion proof requirements, make sure that both transmitter covers are fully
■
engaged.
EN
2-1
FIGURE 2-1. Installation Flowchart.
EN
CALIBRATE
PressBothZero
andSpanButton
Simultaneously
ApplyZeroPoint
Pressureand
PressZeroButton
ApplySpanPoint
Pressureand
PressSpanButton
A
STARTHERE
Usinga
NoSmartAnalog
Communicator?
Yes
CONFIGURE
SetUnits
Set
RangePoints
Set
OutputType
Set
Damping
A
Bench
Calibration?
Yes
Analog
or
Smart?
VERIFY
A
ApplyPressure
Within
Specifications?
No
Referto
Troubleshooting
Section
No
Yes
B
ADJUSTANALOG
ZERO/SPAN
Apply4mA-point
PressureandTurn
ZeroScrewto
Output4mA
Apply
20mA-point
Pressure
SubtractActual
Outputfrom
DesiredOutput
Divide
Difference
by5
TurnSpanScrew
aboveorbelowDesiredOutputbyValueinLastStep
FIELD
B
INSTALL
CheckJumper
orSwitches
Mount
Transmitter
Wire
Transmitter
Power
Transmitter
Zero
Transmitter
CheckforLeaks
2-2
RepeatSteps
until
Calibrated
B
DONE
WIRINGCONNECTIONS
Figure 2-2 shows wiring connections necessary to power a Model PX750 Transmitter
and if smart, enable communications with a hand-held communicator. Shielded cable
should be used for best results in electrically noisy environments.
NOTE
A resistance of at least 250 ohms must exist between the communicator and the
power supply for communications.
FIGURE 2-2. Field Wiring Diagram.
+
Power Wires
–
Hand-Held
Communicator
(For Smart
Transmitters Only)
STANDARD TERMINAL BLOCK
EN
1151-G05D
+
Power Wires
–
OPTION CODE R1 TERMINAL BLOCK
2-3
1151-1151K05A
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