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Summary of Contents for Omega PX2088
- Page 1 User’s Guide Model PX2088 Pressure Transmitter http://www.omega.com e-mail: info@omega.com PX2088 Pressure Transmitter...
- Page 2 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.
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Page 3: Table Of Contents
Table of Contents SECTION 1 Introduction Overview ............1-1 Safety Messages . - Page 4 Wiring Connections PX2088 ........
- Page 5 SECTION 6 Spare Parts and Ordering Spare Parts ............6-1 SECTION 7 LCD Meter LCD Meter for Smart Transmitters .
- Page 6 APPENDIX A Model HC275 HART Communicator Overview ............A-1 Safety Messages .
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Page 7: Introduction
SECTION Introduction OVERVIEW This section contains general transmitter safety information, a brief description of each model covered in this manual, and a summary of each of each section. SAFETY MESSAGES Procedures and instructions in this manual may require special precautions to ensure the safety of the personnel performing the operations. -
Page 8: Models Covered
Pressure Transmitter. It is organized into the following sections: Section 2 Commissioning the Smart Transmitter This section provides information on commissioning and operating the Model PX2088 Smart Pressure Transmitter. Information is also included on software functions, configuration parameters, and on-line variables. -
Page 9: Commissioning The Smart Transmitter
SECTION Commissioning the Smart Transmitter OVERVIEW This section contains information regarding commissioning the transmitter. Commissioning involves reviewing configuration data, setting the 4 and 20 mA points, configuring the transmitter to recognize accessories such as a LCD meter, and testing the transmitter output. SAFETY MESSAGES This section contains procedures that require connecting a communicator to the transmitter, or making connections in an explosive atmosphere. -
Page 10: Commission: On The Bench Or In The Loop
If the communicator lacks the device driver for the PX2088 Smart, the transmitter will be identified as “GENERIC” by the communicator. Basic configuration functions are still possible, but many advanced configuration functions are not possible when the communicator is in this mode. -
Page 11: Review Configuration Data
Process Variables HART Fast Keys 1, 1 The process variables for the Model PX2088 Smart provide the transmitter output, and are continuously updated. The Process Variable menu displays the following process variables: Pressure Percent Range... -
Page 12: Basic Setup
After changing units, press SEND (F2) so the microprocessor will recalculate the associated variables (4–20 mA points, for example). The Model PX2088 Smart recalculates all variables that depend on units. After the transmitter recalculates the variables, you may change any of the... -
Page 13: Rerange
NOTE Regardless of the range points, the Model PX2088 Smart will measure and report all readings within the digital limits of the sensor. For example, if the 4 and 20 mA... -
Page 14: Damping
1, 4, 3, 4, 3 Burst Mode sets the transmitter to maintain digital contact with a Digital Control System that has custom software to support burst mode. When the Model PX2088 Smart is configured for burst mode, it provides faster digital communication from the transmitter to the control system by eliminating the time required for the control system to request information from the transmitter. -
Page 15: Save, Recall, Or Clone Configuration Data
® Burst mode is compatible with use of the analog signal. Because HART protocol features simultaneous digital and analog data transmission, the analog value can drive other equipment in the loop while the control system is receiving the digital information. Burst mode applies only to the transmission of dynamic data (pressure and temperature in engineering units, pressure in percent of range, and/or analog output in mA or V), and does not affect the way other transmitter data is accessed. -
Page 16: Calibration
Digital to Analog Trim (Page 2-11) or Scaled Digital to Analog Trim (Page 2-12) Figure 2-3 illustrates the Model PX2088 Smart transmitter data flow. This data flow can be summarized in four major steps: 1. A change in pressure is measured by a change in the sensor output (Sensor Signal). -
Page 17: Sensor Trim
FIGURE 2-3. Transmitter Data Flow with Calibration Options. (Transmitter Ranged 0 to 100 inH Transmitter Electronics Module Analog-to- Microprocessor Digital-to-Analog Digital Signal Digital PV Signal Conversion Conversion HART Communications 100 inH 20.00 mA Output Device Input Device If readings do PX2088S:PT-4763 not match If readings do not... - Page 18 A zero trim is a single-point adjustment. It is useful for compensating for mounting position effects, and can be performed with the transmitter installed or from the bench. Since this correction maintains the slope of the characterization curve, it should not be used in place of a full trim over the full sensor range. A full trim is a two-point sensor calibration where two end-point pressures are applied, and all output is linearized between them.
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Page 19: Output Trim
NOTE Select pressure input values so that the low and high values are equal to or outside the 4 and 20 mA points. Do not attempt to obtain reverse output by reversing the high and low points. The transmitter allows approximately a 5% URL deviation from the characterized curve established at the factory. -
Page 20: Diagnostics And Service
7. Select “OK” at the “Setting fld dev output to 20 mA” prompt, and repeat Steps 5 and 6 until the reference meter value equals the transmitter output value. Select “OK” after you return the control loop to automatic control. Scaled Digital to Analog Trim HART Comm. -
Page 21: Multidrop Communication
4. Check the current meter installed in the test loop to verify that it reads the value you commanded the transmitter to output. If the readings do not match, the transmitter requires an output trim or the current meter is malfunctioning. - Page 22 NOTE The transmitter is set to address 0 at the factory, allowing it to operate in the standard point-to-point manner with a 4–20 mA output signal. To activate multidrop communication, you must change the transmitter address to a number from 1 to 15. This change deactivates the 4–20 mA analog output, locking it to 4 mA.
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Page 23: Commissioning The Analog Transmitter
Failure to follow safe commissioning guidelines can cause death or serious injury. Please review the following safety messages before commissioning a Model PX2088 Pressure Transmitter. To avoid explosions, do not remove the instrument cover or make electrical connections in explosive atmospheres when the circuit is alive. -
Page 24: Commission: On The Bench Or In The Loop
COMMISSION: ON THE BENCH OR IN THE LOOP Commission the Model PX2088 Analog transmitter before or after installation. It may be useful to commission the transmitter on the bench before installation to ensure proper operation and to avoid exposing the transmitter electronics to the plant environment. -
Page 25: Zero And Span Adjustments
FIGURE 3-2. Transmitter Terminal and Electronics Compartments. TERMINAL ELECTRONICS COMPARTMENT COMPARTMENT Potentiometer Test Terminals Selector Switch Negative Terminal Test Terminal ZERO AND SPAN ADJUSTMENTS Adjustment controls for zero and span are located in the transmitter electronics compartment. Calibrate the transmitter with the three-position switch and the ¾-turn potentiometer (see Figure 3-2). -
Page 26: Potentiometer Adjustment
Potentiometer Adjustment The procedure for calibrating the Model PX2088 is different from that of any other pressure transmitters and takes some time to become accustomed to. However, this method of calibration is considerably faster than other calibration methods. In addition, there is no interaction between the zero and span adjustments. -
Page 27: Setting The Span
The selector switch should not be set to the “Z” position unless the potentiometer will be adjusted. Failure to adjust the potentiometer while in the “Z” position will result in erroneous transmitter output during an overpressure event, and a shift in calibration after the overpressure event. -
Page 29: Installation
This section contains a flowchart (Figure 4-1 on Page 4-2), installation procedures, and a wiring diagram (Figure 4-8 on Page 4-10), to guide you to a successful Model PX2088 installation. Shielded cable should be used for best results in electrically noisy environments. - Page 30 High voltage that may be present on leads could cause electrical shock: • Avoid contact with leads and terminals. FIGURE 4-1. Installation Flowchart. Bench START HERE Calibration? FIELD VERIFY INSTALL Smart Analog Apply Pressure Check Jumper or Switches (Smart Only) Check Configuration Check Configuration (See Chapter 2)
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Page 31: Installation
The Model PX2088 weighs approximately 2.0 pounds (0.9 kg). In many cases, its compact size and light weight makes it possible to mount the Model PX2088 directly t the impulse line without using an additional mounting bracket. When this is not desirable, mount directly to a wall, panel, or two-inch pipe using the optional mounting bracket (see Figure 4-3). - Page 32 FIGURE 4-2. Model PX2088 Mounting Configurations for Liquids, Gases, and Steam. GAS OR LIQUID SERVICE LIQUID OR STEAM SERVICE SERVICE FIGURE 4-3. Model PX2088 Mounting Configurations with Optional Bracket. (132) (91) 1.25 (32) 3.10 2.48 5.97 (79) (63) (152) Mounting bracket ordering...
- Page 33 Page 4-10). Tighten the terminal screws to ensure that adequate contact is made. No additional power wiring is required. To connect test equipment for monitoring the output of the Model PX2088 during maintenance procedures, connect one lead to the terminal labeled “TEST+”...
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Page 34: Power Supply
Note that the resistance of intrinsic safety barriers, if used, must be included. Figure 4-9 shows the transmitter power supply load limitations. FIGURE 4-9. Transmitter Load Limitations. MODEL PX2088 Max. Load = 45.4 (Power Supply Voltage) –10.5 Operating... -
Page 35: Failure Mode And Security Jumpers
(Security Jumpers are Available with Smart Transmitters Only) Failure Mode As part of normal operation, the Model PX2088 Smart continuously monitors its own operation. This automatic diagnostic routine is a timed series of checks repeated continuously. If the diagnostic routine detects a failure in the transmitter, the transmitter drives its output either below or above specific values depending on the position of the failure mode jumper or switch. -
Page 36: Transmitter Security
ZERO AND SPAN ADJUSTMENTS Smart The Model PX2088 Smart is equipped with local zero and span adjustment buttons. The buttons are located on the top of the transmitter beneath the certifications label. Use the zero and span adjustments to set the 4 and 20 mA output points. -
Page 37: Rerange Procedure
Rerange Procedure To rerange the transmitter using the span and zero buttons, perform the following procedure. 1. Loosen the screw holding the nameplate on top of the transmitter housing and rotate the nameplate to expose the zero and span buttons (see Figure 4-11). 2. - Page 38 Analog If it is necessary to make zero or span adjustments after installation of the transmitter, use the zero/span selector switch and the potentiometers to rerange the transmitter 4-14...
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Page 39: Troubleshooting
SECTION Troubleshooting This section provides basic troubleshooting suggestions to help solve the most common operating problems. 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. - Page 40 TROUBLESHOOTING TABLE 5-1. Smart Transmitter Troubleshooting and Corrective Actions. Symptom Potential Source Corrective Action High Output Impulse Piping, • Check for blockage in the impulse line. • Check to ensure that the blocking valve is fully open. • Check for trapped gas in a liquid line, or trapped liquid in a gas line.
- Page 41 TABLE 5-1. (continued).Smart Transmitter Troubleshooting and Corrective Actions. Symptom Potential Source Corrective Action Low Output or Impulse Piping • Check for leaks or blockage in the impulse line. No Output • Check to ensure that the blocking valve is fully open. •...
- Page 42 TABLE 5-2. (continued).Analog Transmitter Troubleshooting and Corrective Actions. Symptom Potential Source Corrective Action Erratic Output Impulse Piping • Check for leaks or blockage in the impulse line. • Check to ensure that the blocking valve is fully open. • Check for trapped gas in a liquid line, or trapped liquid in a gas line.
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Page 43: Spare Parts And Ordering
SECTION Spare Parts and Ordering SPARE PARTS FIGURE 6-1. Model PX2088 Smart Transmitter Exploded View. LCD Meter Cover Assembly includes LCD Cover and O- ring Part Description Item No. Part Number Spares Category Smart Transmitters (Output Code S) Electronics Cover (with O-ring) - Page 44 FIGURE 6-2. Replacement Parts for the Model PX2088. LCD Meter Cover Assembly includes LCD Cover and O-ring Part Description Item No. Part Number Spares Category Analog Transmitters (Output Codes A and M) Electronics Cover 02088-0014-0002 LCD Meter Cover Assembly 02088-0075-0003...
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Page 46: Lcd Meter
SECTION LCD Meter LCD METER FOR SMART TRANSMITTERS The LCD meter provides local indication of the output, and abbreviated diagnostic messages governing transmitter operation. The meter is located on the electronics module side of the transmitter, maintaining direct access to the signal terminals. An extended cover is required to accommodate the LCD Meter for Smart Transmitters. -
Page 47: Diagnostic Messages
FIGURE 7-1. Exploded View of the Transmitter with Optional LCD Meter. Interconnecting Pins Jumpers (top and bottom) LCD Meter Extended Cover Diagnostic Messages In addition to the output, the LCD meter displays abbreviated operation, error, and warning messages for troubleshooting the transmitter. Messages appear according to their priority, with normal operating messages appearing last. - Page 48 FAIL CONFIG A non-volatile memory fault has been detected in the transmitter memory by the memory verification routine. The memory fault is in a location that could effect transmitter operation, and is user-accessible. To correct this problem, use a Model HC275 HART Communicator to interrogate and reconfigure the appropriate portion of the transmitter memory.
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Page 49: Lcd Meter For Analog Transmitters
Note the following LCD temperature limits: Operating: –4 to 175 °F (–20 to 80 °C). Storage: –40 to 185 °F (–40 to 85 °C). FIGURE 7-2. LCD Meter on a Model PX2088 Analog. Meter Selector Engineering Units Switch Potentiometer Adjustment... -
Page 50: Diagnostic Message Display
DIAGNOSTIC MESSAGE DISPLAY Model PX2088 Analog Transmitter conducts regular diagnostic routines and can identify several types of failure conditions. If the transmitter detects a failure, the indicator displays “FAIL”. In addition to detecting and displaying transmitter failures, the meter display will flash when other conditions exist. -
Page 51: Configuration
NOTE If you are using a transmitter that has a white plastic electronics cover, perform the following procedure to replace it with a local indicator. If you are using a transmitter that has a black plastic electronics cover, proceed to Step 4 a. -
Page 52: Positioning The Decimal Point
Positioning the Decimal Point The decimal point may be positioned in one of four locations, as shown in Figure 7-2 on Page 7-4. The decimal point will remain fixed in this position until it is repositioned. 1. Place the meter selector switch in the “Z” (Zero) position. NOTE The meter selector switch must be placed in the “Z”... - Page 53 4. Return the meter selector switch to the “RUN” position. This action prompts the microprocessor to store the set value in memory and deactivates the potentiometer. 5. Apply pressure to the transmitter that represents the full-scale calibration. 6. Place the meter selector switch in the “S” (Span) position. 7.
- Page 54 SECTION Model HC275 HART Communicator OVERVIEW This appendix provides basic communicator information on the Model HC275 HART Communicator when used with a Model PX2088S Smart Pressure Transmitter. Included in this appendix is the PX2088S Smart menu tree and fast key table. This brief appendix will familiarize you with the HART Communicator but is not meant to replace the HART Communicator product manual.
- Page 55 FIGURE A-1. HART Communicator Menu Tree for the Model PX2088 Smart 1 Pressure 1 PROCESS 2 Percent Range VARIABLES 3 Analog Output 1 Self test 1 TEST DEVICE 2 Status 1 Keypad Input 1 RERANGE 2 Apply Values 2 DIAGNOSTICS...
- Page 56 TABLE A-1. HART Fast Key Sequences for the Model PX2088S. Function HART Communicator Fast Key Sequences Analog Output Analog Output Alarm 1, 4, 3, 2, 4 Burst Mode Control 1, 4, 3, 3, 3 Burst Operation 1, 4, 3, 3, 4 Calibration 1, 2, 3 Damping...
- Page 58 Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification.
- Page 59 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! TEMPERATURE √ √ Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies √ √ Wire: Thermocouple, RTD & Thermistor √ √ Calibrators & Ice Point References √...
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