Omega Products PX751 Installation Manual

User’s Guide
Model PX751 Pressure Transmitter
http://www.omega.com
e-mail: info@omega.com
Pressure Transmitter
PX751
OMEGAnet® On-Line Service Internet e-mail http://www.omega.com info@omega.com
Servicing North America:
USA: One Omega Drive, Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 Tel: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar
Laval (Quebec) H7L 5A1 Tel: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca
For immediate technical or application assistance:
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM Customer Service: 1-800-622-2378 / 1-800-622-BESTSM Engineering Service: 1-800-872-9436 / 1-800-USA-WHENSM TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA Mexico and Latin America: Tel: (95) 800-826-6342 FAX: (95) 203-359-7807
En Espan˜ol: (95) 203-359-7803 e-mail: espanol@omega.com
Servicing Europe:
Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands Tel: (31) 20 6418405 FAX: (31) 20 6434643
Toll Free in Benelux: 0800 0993344
e-mail: nl@omega.com Czech Republic: ul. Rude armady 1868, 733 01 Karvina-Hranice Tel: 420 (69) 6311899 FAX: 420 (69) 6311114
Toll Free: 0800-1-66342 e-mail: czech@omega.com France: 9, rue Denis Papin, 78190 Trappes Tel: (33) 130-621-400 FAX: (33) 130-699-120 Toll Free in France: 0800-4-06342
e-mail: france@omega.com Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany Tel: 49 (07056) 3017 FAX: 49 (07056) 8540 Toll Free in Germany: 0130 11 21 66
e-mail: info@omega.de United Kingdom: One Omega Drive, River Bend Technology Centre ISO 9002 Certified Northbank, Irlam, Manchester
M44 5EX, England
Tel: 44 (161) 777-6611 FAX: 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.
Table of Contents
SECTION 1 Introduction
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Models Covered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Using this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
New Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1-4
SECTION 2 Commissioning
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Setting the Loop to Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Fast key sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Configure the Analog Output Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Set the Process Variable Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Set the Output Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Rerange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Set the Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
LCD Meter Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Diagnostics and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Transmitter Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Loop Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Sensor Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Analog Output Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Compensating Model PX751 Range 4 and 5
Differential Pressure Transmitters for Line Pressure . . . . . . . . . . . . . . . 2-16
EN
i
EN
SECTION 3 Installation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Mounting Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Housing Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Mounting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Electrical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Failure Mode Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Failure Mode Alarm vs. Saturation Output Values . . . . . . . . . . . . . . . . . . 3-12
SECTION 4 Troubleshooting
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
SECTION 5 Reference Data
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Transmitter Range and Sensor Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Bolt Identification and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
APPENDIX A HART® Communicator
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
iiiiiiii
SECTION
1
Introduction
OVERVIEW
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:
n 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
EN
1-1
MODELS COVERED
This manual provides basic installation, commissioning, and troubleshooting
EN
information for the following Omega® Model PX751 Pressure Transmitters: Model PX751CD Differential Pressure Transmitter
measures differential pressure from 0.5 inH superior performance including 0.075% accuracy and 100:1 rangeability.
Model PX751CG — Gage Pressure Transmitter
measures gage pressure from 2.5 inH proven capacitance cell technology.
Model PX751CA — Absolute Pressure Transmitter
measures absolute pressure from 0.167 to 4,000 psia (8.6 mmHga to 27580 kPa) using patented piezoresistive silicon sensor.
Model PX751H — High Process Temperature Pressure Transmitter
provides high process temperature capability to 375 °F (191°C), without the use of remote diaphragm seals or capillaries. These transmitters are available for differential and gage configurations (PX751HD and PX751HG).
Model PX751P —
provides 0.05% accuracy. The Model PX751P is the most accurate pressure transmitter available and is ideal for fiscal and allocation metering. Eliminates the need to stack multiple transmitters.
Model PX751T – Gage and Absolute Pressure Transmitter
measures absolute and gage pressures from 2,000 to 10,000 psi (13800 to 68900 kPa). The Model PX751T uses a single isolator design and microprocessor-based electronics.
Reference Class
2
Pressure Transmitter
O to 2,000 psi (0.12–13800 kPa) with
2
O to 2,000 psig (0.62–13800 kPa) using
1-2
USING THIS MANUAL
This manual is designed to assist in basic installation and operation of Model PX751 Family of Smart Pressure Transmitters. For more detailed information, contact an Omega product specialist.
Section 2 Commissioning
provides a description of common commissioning tasks.
Section 3 Installation
provides a flowchart outlining installation procedures and installation wiring diagrams.
Section 4 Troubleshooting
provides basic troubleshooting techniques for common diagnostic messages associated with the transmitter and the communicator.
Section 5 Reference Data
provides range tables, a typical model structure, and bolt torque specifications for Model PX751 Transmitters.
Appendices
contain menu trees and fast key sequences for the HART Communicator.
EN
1-3
NEW FEATURES
The latest line of Omega Model PX751 pressure transmitters feature physical and
EN
software enhancements for additional functionality and increased ease of use.
Local Zero and Span Adjustments
•Simplified Push-Button Operation
Electronics Housing
•FOUNDATION™ Fieldbus Compatible
•More Space for Field Wiring
New Software Features
•Custom LCD Meter Units
•NAMUR Compliant Alarm and Saturation Limits Available
Electronics Board
•“Plug-In” Shrouded Design
•Clear Labeling Simplifies Part Identification
•Fully Backwards Compatible
Terminal Block
•3-Post Design Supports External Meters
•Encapsulated Electronics for Increased Robustness
•“Plug-In” Design for Easy Installation
No Changes to the
Process Connections
Sensor Module
•Welded Metal Cap
•All Welded Design
•Fully Backwards Compatible
Optional LCD Meter
•2-line Display
•Capable of Displaying Custom Flow, Level, or Pressure Units
•Alarm and Security Jumpers on Faceplate
3051-3031A08B, 3051LCD
1-4
SECTION
2
Commissioning
OVERVIEW
This section summarizes Model PX751 Transmitter commissioning procedures.
SAFETY MESSAGES
Procedures and instructions in this section may require special precautions to ensure the safety of the personnel performing the operations. Information that raises potential safety issues is indicated by a warning symbol (). Refer to the following safety messages before performing an operation preceded by this symbol.
Warnings ( )
Explosions can result in death or serious injury.
•Do not remove the transmitter covers in explosive environments when the circuit is alive.
•Both transmitter covers must be fully engaged to meet explosion-proof requirements.
•Before connecting a communicator in an explosive atmosphere, make sure the instruments in the loop are installed in accordance with intrinsically safe or nonincendive field wiring practices.
EN
Electrical shock can result in death or serious injury.
•Avoid contact with the leads and the terminals. High voltage that may be present on leads can cause electrical shock.
2-1
SETTING THE LOOP TO MANUAL
Whenever you are preparing to send or request data that would disrupt the loop or
EN
change the output of the transmitter, you will have to set your process application loop to manual. The HART Communicator Model HC275 will prompt you to set the loop to manual when necessary. Keep in mind that acknowledging this prompter does not set the loop to manual. It’s only a reminder; you have to set the loop to manual yourself, as a separate operation.
FAST KEY SEQUENCES
For your convenience, fast key sequences are listed for common transmitter functions. Complete tables of fast key sequences are located in Appendix A/ If you are unfamiliar with the communicator or how to follow fast key sequences, please refer to Appendix A for communicator operations.
The fast key boxes in this section contain codes for the HART Communicator Model HC275. From the Online menu (HART Communicator) press these key sequences to access the desired transmitter function.
CONFIGURE THE ANALOG OUTPUT PARAMETERS
NOTE
The position of the transmitter security jumper may prevent configuration changes. Refer to Section 5 for the proper placement of the transmitter security jumper.
Set the Process Variable Units
HART Comm.
The Model PX751 allows any of the following output units: inH2O, inHg, ftH2O,
2
mmH
O, mmHg, psi, bar, mbar, g/cm2, kg/cm2, Pa, kPa, torr, and atm.
1, 3, 2
2-2
Set the Output Type
HART Comm.
You can set the transmitter output to either linear or square root. Activate the transmitter square root output mode to make the analog output proportional to flow. While in square root output mode, the Model PX751 switches to linear output at 0.8% of ranged pressure input, or 9% of full scale flow output to avoid the extremely high gain that results as the input approaches zero. The transition from linear to square root output is smooth, with no step change or discontinuity in output.
1, 3, 5
Rerange
The Range Values command sets the 4 and 20 mA points (lower and upper range values). Setting the range values to the limits of expected readings maximizes transmitter performance; the transmitter is most accurate when operated within the expected pressure ranges for your application. In practice, you may reset the transmitter range values as often as necessary to reflect changing process conditions.
NOTE
Regardless of the range points, the Model PX751 will measure and report all readings within the digital limits of the sensor. For example, if the 4 and 20 mA points are set to 0 and 10 inH20, and the transmitter detects a pressure of 25 inH20, it digitally outputs the 25 in H may be up to ±5.0% error associated with output outside of the range points.
You may use one of three methods to rerange the transmitter. Each method is unique; examine all three closely before deciding which method to use.
0 reading and a 250% percent of span reading. However, there
2
EN
2-3
Rerange with a Communicator Only
EN
HART Comm.
Reranging using only the communicator is the easiest and most popular way to rerange the transmitter. This method changes the values of the analog 4 and 20 mA points independently without a pressure input.
NOTE
Changing the lower or upper range point results in similar changes to the span.
NOTE
If the transmitter security jumper is in the “ON” position, you will not be able to make adjustments to the zero and span. Refer to Figure 3-12 on Page 3-11 for the appropriate placement of the transmitter security jumper.
4 -or- 5
Rerange with a Pressure Input Source and a Communicator
HART Comm.
Reranging using the communicator and a pressure source or process pressure is a way of reranging the transmitter when specific 4 and 20 mA points are not known. This method changes the values of the analog 4 and 20 mA points.
To rerange using the communicator and a pressure source or process pressure enter the fast-key sequence above, select 2 Apply values, and follow the on-line instructions.
1, 2, 3, 1, 2
NOTE
If the transmitter security jumper is in the “ON” position, you will not be able to make adjustments to the zero and span. Refer to Figure 3-12 on Page 3-11 for the appropriate placement of the transmitter security jumper.
2-4
Rerange with a Pressure Input Source and t he Local Zero and Span Buttons
Reranging using the local zero and span adjustments (see Figure 2-1), and a pressure sour c e i s a w a y o f r e r a n g i n g t h e t ra n s m i t t e r when specific 4 and 20 mA points are not known and a c o m m u n i c a t or i s n o t av a i l a b l e .
NOTE
When you set the 4 mA point the span is maintained; when you set the 20 mA point the span changes. If you set the lower range point to a value that causes the upper range point to exceed the sensor limit, the upper range point is automatically set to the sensor limit, and the span is adjusted accordingly.
To rerange the transmitter using the span and zero buttons, perform the following procedure.
1. Loosen the screw holding the ce rtif ications l abel on t op of t he transmit t er housing, and rotate the label to expose the zero and span buttons (see Figure 2-1 on page 2-5).
2. Using a pressure source with an accuracy three to ten times the desired calibrated accuracy, apply a pressure equivalent to the lower range value to the high side of the transmitter.
3. To set the 4 mA point, press and hold the zero button for at least two seconds, then verify that the output is 4 mA. If a meter is installed, it will display ZERO PASS.
4. Apply a pressure equivalent to the upper range value to the high side of the transmitter.
5. To set the 20 mA point, press and hold the span button for at least two seconds, then verify that the output is 20 mA. If a meter is installed, it will display SPAN PASS.
EN
NOTE
If the transmitter security jumper is in the “ON” p osition, or if the local zero a nd spa n adjustments are disabled through the software, you will not be able to make adjustments to the z e r o and s pan u s i ng th e local buttons. Ref e r t o Figure 3-12 on Page 3-1 1 for the proper placement of the transmitter security jumper. Or refer to “Local Span and Zero Control” on page 2-6 for instructions on how to enable the span and zero buttons.
FIGURE 2-1. Local Zero and Span Adjustments.
Span and Zero Adjustment Bu tto ns
2-5
3051-3031D02A
Local Span and Zero Control
EN
HART Comm.
1, 4, 4, 1, 7
The Local keys command allows software control over the use of the local span and zero adjustments. To enable or disable the span and zero adjustment buttons on your transmitter, perform the fast key sequence above.
NOTE
Disabling the local keys only disables transmitter configuration changes using the zero and span buttons. With the local keys disabled, you can still make changes to the transmitter configuration using a Hart Communicator.
Set the Damping
HART Comm.
The Model PX751 electronic damping feature changes the response time of the transmitter to smooth variations in output readings caused by rapid changes in input. Determine the appropriate damping setting based on the necessary response time, signal stability, and other requirements of the loop dynamics of your system.
1, 3, 6
LCD Meter Options
HART Comm.
1, 4, 3, 4
The Meter Options command allows you to customize the LCD meter for use in your application. You can configure the meter to display the following information:
nEngineering Units nPercent of Range nUser-Configurable LCD Scale
(1)
nAlternating between any two of the above
The user-configurable scale (2 CM Setup) is a new feature that enables you to configure the LCD meter to a custom scale using a Model HC275 HART communicator. With this feature you can define the decimal point position, the upper range value, the lower range value, the engineering units, and the transfer function. For more detailed LCD meter information, contact an Omega product specialist. .
(1) The user -configurable LCD scale is a feature specific to the new 4–20 mA output transmitters. It
is not available with Low Power transmitters.
2-6
Loading...
+ 32 hidden pages