Emerson 755A Instruction Manual
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Emerson 755A Instruction Manual

Emerson 755A Instruction Manual

Oxygen analyzer
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Instruction Manual
245364-V
May 2002
Model 755A
Oxygen Analyzer
http://www.processanalytic.com

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Summary of Contents for Emerson 755A

  • Page 1 Instruction Manual 245364-V May 2002 Model 755A Oxygen Analyzer http://www.processanalytic.com...
  • Page 2 The information contained in this document is subject to change without notice. Teflon is a registered trademark of E.I. duPont de Nemours and Co., Inc. SNOOP is a registered trademark of NUPRO Co. Emerson Process Management Rosemount Analytical Inc. Process Analytic Division 1201 N.

  • Page 3: Table Of Contents

    Sample Pressure Requirements: General ..............2-7 c. Normal Operation at Positive Gauge Pressures.............2-9 d. Operation at Negative Gauge Pressures ................2-9 e. Sample Flow Rate......................2-9 Corrosive Gases ......................2-10 Leak Test ..........................2-10 Purge Kit (Optional) .......................2-11 Rosemount Analytical Inc. A Division of Emerson Process Management Contents...
  • Page 4 Pressure Signal Circuit ....................5-9 c. Positive and Negative Reference Voltage Circuits ............5-9 Buffer Amplifiers U10 and Associated Anticipation Function ..........5-11 Digital Output Circuit......................5-12 Analog Output Circuits for Recorder and Alarms ..............5-12 Contents Rosemount Analytical Inc. A Division of Emerson Process Management...
  • Page 5 Matrix .............................7-2 RETURN OF MATERIAL ......................8-1 Return Of Material .........................8-1 Customer Service ........................8-1 Training..........................8-1 APPENDIX A - VAISALA BAROMETRIC PRESSURE TRANSDUCER..........A-1 Overview..........................A-1 Circuit Function........................A-1 Installation..........................A-1 Adjustment..........................A-2 High Altitude Version (Option) ....................A-2 Rosemount Analytical Inc. A Division of Emerson Process Management Contents...
  • Page 6 Table 3-1. Standard Gases Recommended for Calibration of Various Oxygen Ranges on Analog Output ......................3-5 Table 3-2. Model 755A Internal Adjustments................3-6 Table 3-3. Oxygen Equivalents of Common Gases.............. 3-11 Contents Rosemount Analytical Inc. A Division of Emerson Process Management...
  • Page 7 Schematic Diagram, Master Board (Case) 617731 Pictorial Wiring Diagram, Model 755A 620434 Schematic Diagram, Current Output 632349 Installation Drawing, Model 755A 652219 Schematic Diagram, Control Board 652222 Schematic Diagram, Transducer Rosemount Analytical Inc. A Division of Emerson Process Management Contents...
  • Page 8 Instruction Manual 245364-V Model 755A May 2002 Contents Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 9: Preface

    Highlights an operation or maintenance procedure, practice, condition, statement, etc. If not strictly observed, could result in damage to or destruction of equipment, or loss of effectiveness. NOTE Highlights an essential operating procedure, condition or statement. Rosemount Analytical Inc. A Division of Emerson Process Management Preface...

  • Page 10: Intended Use Statement

    This analyzer requires periodic calibration with known zero and standard gases. Refer to Sections 2-5 (page 2-7) and 2-6 (page 2-7). See also General Precautions for Handling and Storing High Pressure Cylinders, page P-4. Preface Rosemount Analytical Inc. A Division of Emerson Process Management...
  • Page 11 CAUTION PRESSURIZED GAS This module requires periodic use of pressurized gas. See General Precautions for Handling and Storing High Pressure Gas Cylinders, page P-4 Rosemount Analytical Inc. A Division of Emerson Process Management Preface...

  • Page 12: General Precautions For Handling And Storing High Pressure Gas Cylinders

    8. Do not place cylinders where they may become part of an electric circuit. When electric arc welding, precautions must be taken to prevent striking an arc against the cylinder. Preface Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 13: Documentation

    This product may carry approvals from a certifying agency or may be in compliance with EMC Directive. If so, the product will carry approval insignia, like those shown here, on the product name rating plate. ® Rosemount Analytical Inc. A Division of Emerson Process Management Preface...
  • Page 14 Instruction Manual 245364-V Model 755A May 2002 Preface Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 15: Description And Specifications

    M o d e l 7 5 5 A Rosemount Analytical O x y g e n A n a l y z e r TEST Switch Figure 1-1. Model 755A Oxygen Analyzer Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications...

  • Page 16: Oxygen Ranges For Recorder Readout

    19% oxygen. Electrical Power The analyzer is supplied, as ordered, for operation on either 120 VAC, 50/60 Hz, or 240 VAC, 50/60 Hz. Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 17: Figure 1-2. Model 755A Component And Adjustment Locations

    Case Heater Fuse AC Power AC Power Detector/Magnet As- sembly Shock Mount Transducer Detector/Magnet Transformer, Power T1 Assembly (Behind TB1) Figure 1-2. Model 755A Component and Adjustment Locations Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications...

  • Page 18: Specifications

    Deviation from set flow would be held to within ±10% or ±20 cc/min, whichever is smaller. If so, zero and span drift will be within specifications, provided that operating temperature remains constant. Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 19: Electrical

    Code (ANSI/NFPA 70) for analyzers sampling nonflammable gases. Analyzers sampling flammable gases must be pro- tected by a continuous dilution purge system in accordance with Standard ANSI/NFPA 496-1986, Chapter 8. Consult factory for recommendations. Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications...
  • Page 20 Instruction Manual 245364-V Model 755A May 2002 Description and Specifications Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 21: Installation

    NOTE NOTE Refer to Installation Drawing 642349 at the rear of this manual for recommended cable Do not draw power for associated conduit openings. equipment from the analyzer power cable. Rosemount Analytical Inc. A Division of Emerson Process Management Installation...

  • Page 22: Recorder Connections

    (page 2-3). NO. 1 RESET NO. 2 + - + mV Recorder RESET mA Recorder Power Connections (see below) Jumpers Jumper 120 VAC CONFIGURATION 240 VAC CONFIGURATION Figure 2-1. Electrical Connections Installation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 23: Figure 2-2. Control Board

    Minimum Permissible Selector Plug Resistance for R1 + R2 10 mV 1K Ohm 100 mV 10K Ohm 100K Ohm 2K Ohm Figure 2-3. Connections for Potentiometric Recorder with Non-Standard Span Rosemount Analytical Inc. A Division of Emerson Process Management Installation...

  • Page 24: Isolated Current Output (Optional)

    Note the following recommendations: vibration through the cable to the detector, which can cause loss of 1. A line fuse should be installed in the accuracy. line between the (customer-supplied) Installation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 25: Alarm Relay Characteristics

    Relay contacts should needle moves upscale through the value then be connected accordingly. Refer to that corresponds to the setpoint plus Figure 2-6, page 2-6. deadband. This relay coil is energized Rosemount Analytical Inc. A Division of Emerson Process Management Installation...

  • Page 26: Figure 2-5. Typical Alarm Settings

    Valve Fail-Safe Higher High Alarm 115 VAC Alarm Bell Indicator, 115 VAC or Lamp Fail-Safe RESET RESET No. 2 No. 2 Figure 2-6. Relay Terminal Connections for Typical Fail-Safe Application Installation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 27: Calibration Gases

    Most sample handling calibrate the analyzer at the same systems have copper or brass components; pressure that will be used during however, stainless steel components are subsequent operation and to maintain this Rosemount Analytical Inc. A Division of Emerson Process Management Installation...

  • Page 28: Figure 2-7. Connection Of Typical Gas Selector Panel To Model 755A Oxygen Analyzer

    Valves Model 755A Oxygen Analyzer Sample In Two Micron To Vent Filter Downscale Flowmeter Standard Upscale Standard Figure 2-7. Connection of Typical Gas Selector Panel to Model 755A Oxygen Analyzer Installation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 29: Normal Operation At Positive Gauge Pressures

    In addition, any leakage will result in decreased readout accuracy as compared with operation at atmospheric pressure. The minimum permissible operating pressure is -1.9 psig (-13.1 kPa). Rosemount Analytical Inc. A Division of Emerson Process Management Installation...

  • Page 30: Corrosive Gases

    (69 kPa) to analyzer via a flow indicator with range of 0 to 250 cc/min. Set flow at 125 cc/min. Plug sample outlet. Flow reading should drop to zero. If not, system is leaking. 2-10 Installation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 31: Purge Kit (Optional)

    These standards are not applicable to enclosures into which a flammable gas or vapor mixture is introduced, such as by a continuous sample containment system that is subject to accidental leakage. Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-11...

  • Page 32: Figure 2-8. Installation Of Purge Kit (Optional)

    Purge Supply Purge Supply Flow Indicator Pressure Indicator or Alarm 645835 Purge Outlet Fitting Components in dashed line are supplied by customer. Figure 2-8. Installation of Purge Kit (Optional) 2-12 Installation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 33: Operation

    Note that on the circuit board switch positions are marked according to the amplifier gain. Desired Oxygen Amplifier Gain Span for Recorder Marking on Board 100% 100X Rosemount Analytical Inc. A Division of Emerson Process Management Operation...

  • Page 34: Figure 3-1. Model 755A Front Panel Controls

    SPAN Control (R16) suitable upscale standard gas flowing through the analyzer, the SPAN Control is adjusted for appropriate reading on display or recorder. Figure 3-1. Model 755A Front Panel Controls Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 35: Readout Of Applied Zero-Suppression Voltage On Digital Display

    99% to 100% oxygen range of this example, a slight readjustment of R104 may be required to set the recorder pen at the precisely correct position on the chart. Rosemount Analytical Inc. A Division of Emerson Process Management Operation...

  • Page 36: Startup Procedure

    1. A zero-based range normally uses an the suspension within the detector assembly. oxygen-free gas, typically nitrogen. To correct this condition, turn power OFF; tap Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 37: Table 3-1. Standard Gases Recommended For Calibration Of Various Oxygen Ranges On Analog Output

    99 to 100 High Purity O2 91% ±0.5% O2 Balance N2 90 to 100 High Purity O2 Table 3-1. Standard Gases Recommended for Calibration of Various Oxygen Ranges on Analog Output Rosemount Analytical Inc. A Division of Emerson Process Management Operation...

  • Page 38: Table 3-2. Model 755A Internal Adjustments

    Use to set fullscale current output at 20mA for 4 to 20mA or 0 to 20mA board or at Adjustment R2 50mA for 10 to 50mA board. Figure 3-2 Refer to , page 3-7, for component locations. Table 3-2. Model 755A Internal Adjustments Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 39: Figure 3-2. Model 755A Internal Adjustments Locations

    Instruction Manual 245364-V May 2002 Model 755A Control Board Door I G O I G O Refer to Table 3-2, page 3-6, for descriptions. Figure 3-2. Model 755A Internal Adjustments Locations Rosemount Analytical Inc. A Division of Emerson Process Management Operation...

  • Page 40: Calibration With Downscale And Upscale Standard Gases

    Control, refer to Section 6, conditions are otherwise, the pressure Service and Maintenance. compensation circuit must be re- calibrated by the following procedure: 2. Set upscale calibration point as follows: Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 41: Figure 3-3. Calibration By Pressure Decrease Setup

    00.00±5 counts on the display. concentration of the gas used during calibration be close to that of the process stream which is to be analyzed. Rosemount Analytical Inc. A Division of Emerson Process Management Operation...

  • Page 42: Compensation For Composition Of Background Gas

    In equation form: Adjusted value = % O2 in Std + %O2 Equivalent of Gas = % O2 in Std Analyzer Response to Gas [100(Spl-Std)]-100(Spl-Std) X 100 Analyzer Response to O 3-10 Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 43: Table 3-3.Oxygen Equivalents Of Common Gases

    Water, H -0.381 negative. Use a recorder with below- Xenon, Xe -1.340 zero capability to set negative values. Table 3-3.Oxygen Equivalents of Common Gases Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-11...

  • Page 44: Dual Alarm Option

    This will re- by connecting an ohmmeter to relay energize the relay. Turning R68 terminals on 638254 Alarm Relay above the setpoint will energize the Assembly (Figure 2-1, page 2-2). relay. 3-12 Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 45: Selection Of Deadband

    1. RELAYS SHOWN IN ENERGIZED POSITION. NOTES: +15V ALARM 1 -15V RESET ALARM 1 COMMAND ALARM 2 RESET ALARM 2 COMMAND Figure 3-4. Schematic Circuit of Alarm Relay Assembly Rosemount Analytical Inc. A Division of Emerson Process Management Operation 3-13...

  • Page 46: Routine Operation

    The appropriate calibration interval will noise. depend on the accuracy required in the particular application, and is best determined by keeping a calibration log. 3-14 Operation Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 47: Theory

    = c (k - k The restoring current is automatically maintained at the correct level by an electro-optical feedback system. A beam of Rosemount Analytical Inc. A Division of Emerson Process Management Theory...

  • Page 48: Physical Configuration Of Detector/Magnet Assembly

    HR1 and Hr2. Magnetic Field On the optical bench assembly, Figure 4-3C (page 4-4), the source lamp and the photocell plate are externally accessible, permitting convenient replacement. Theory Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 49: Figure 4-2. Functional Diagram Of Model 755A Paramagnetic Oxygen Measurement System

    DETECTOR/MAGNET Source Lamp ASSEMBLY CONTROL ASSEMBLY Shaded Pole Pieces (4) Zero Span % Oxygen Dual Photocell Readout BT1, BT2 Figure 4-2. Functional Diagram of Model 755A Paramagnetic Oxygen Measurement System Rosemount Analytical Inc. A Division of Emerson Process Management Theory...

  • Page 50: Figure 4-3. Detector/Magnet Assembly

    Lamp Viewing Hole Source Lamp Optical Bench Assembly Assembly Detector Assembly C. Exploded View of Optical Bench B. Sectional Top View of Optical Bench Assembly and Detector Assemblies Figure 4-3. Detector/Magnet Assembly Theory Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 51: Variables Influencing Paramagnetic Oxygen Measurements

    2. Immediately downstream from the of Response Time Adjust R30 (see Table inlet port, prior to entry into the 3-2, page 3-6, and Figure 3-2, page 3-7). detector, the sample is preheated by Rosemount Analytical Inc. A Division of Emerson Process Management Theory...

  • Page 52: Electronic Circuitry

    0 to 10 VDC. The Control Board contains signal The circuit solves the follow equation: conditioning and control circuitry. The Control Board is mounted on the inside of Vo = k (Vx/Vz) Theory Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 53: Case Board

    Analog Output Circuit . The output from outputs. Each is routed through an U10 is provided as an input to the associated series-type integrated circuit recorder output amplifier. This circuitry Rosemount Analytical Inc. A Division of Emerson Process Management Theory...

  • Page 54: Isolated Current Output Board (Optional)

    Figure 2-1 of 140°F (60°C). Temperature is sensed on page 2-2. by a thermistor on the Control Board adjacent to critical electronic components. Theory Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 55: Circuit Analysis

    159 mV on the non-inverting terminal. Positive feedback or hysteresis is built into each comparator circuit for stability or positive action. This is achieved by the 20M ohm resistances, R70 and R73. Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis...

  • Page 56: Figure 5-1. Two-Comparator Or Circuit

    (from -15V to -1.89V) to the temperature comparator 2 transistor to cease to conduct. bridge at the rate of 120 pulses per second. Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 57: Figure 5-2. Ramp Generator

    C37 again. The result is that the (comparators 1 and 2) to operate Q6 or Triac potential across C37 will vary almost linearly Q7 in the case heater (Figure 5-5 on page 5- Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis...

  • Page 58: Figure 5-3. Case Heater Control Circuit

    Triac Q7 (Figure 5-5 on page 5- positive; therefore, Q6 does not conduct and a 6) turning it on. charge builds up on capacitor C38. Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 59: Figure 5-4. Case Heater Circuit

    The pulses arrive at Q7 just as the supply AC line voltage is passing the zero-volt crossover point. The purpose of C36 (Figure 5-2 on HEATER MOTOR NEUTRAL 120V Figure 5-4. Case Heater Circuit Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis...

  • Page 60: Detector Heater Control Circuit

    (R55, R56, R59 and RT1) equals 149 K. would not be supplying heat energy to the detector. HR1 +2 120 V 25 VAC +15V 700K 700K CR12 149K .01uF -15V Figure 5-5. Detector Heater Control Circuit Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 61: Detector Light Source Control Circuit

    DS1 is shunted from the main current path, +8.5V BUS +15V 6.1 VAC 120 V 7.5K .01uF 6.1 VAC 9.0V 2.2V .01uF 2000uF 4530 Figure 5-6. Detector Light Source Control Circuit Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis...

  • Page 62: Detector With First Stage Amplifier And Pressure Compensation Circuits

    6a on page 5-9 . be flowing through the feedback loop in order to maintain balance and provide a reading of the oxygen content of the sample. Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 63: Pressure Compensation Circuit

    Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis...

  • Page 64: Figure 5-7. Detector With First Stage Amplifier And Pressure Compensation Circuits

    REFERENCE REFERENCE Reference Voltages TRIM -10.00V CAL 1 To Test Switch CAL2 PRESS To Analog SENSOR Divider U6 +10V -10V Figure 5-8. Pressure Signal and Reference Voltage Circuits 5-10 Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 65: Buffer Amplifiers U10 And Associated Anticipation Function

    Alarms, Section 5-9 on page 5-12 8052A Differentiator Network DIGITAL DISPLAY DISPLAY DRIVER AND 71C03 CONTROL +15V REGULATOR To Analog Output Circuit (Figure 6-9) Figure 5-9. Buffer, Anticipation, and Digital Output Circuit Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis 5-11...

  • Page 66: Digital Output Circuit

    Required zero suppression is 90% RECORDER oxygen; thus the Zero Suppression 100% Selection Jumper is placed in the 80% position, and the Zero Suppression Potentiometer is set for 10% oxygen. 100X 5-12 Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...
  • Page 67 Dual Alarm Amplifier Circuit. This circuit drives Recorder Output Resistor Network. It provides the optional 638254 Alarm Relay Assembly. a jumper-selectable output of 0 to 10 mV, 0 to Rosemount Analytical Inc. A Division of Emerson Process Management Circuit Analysis 5-13...

  • Page 68: Figure 5-10. Simplified Analog Output Circuit For Recorder (Showing Three Ranges)

    Suppression (0% to 25% Oxygen) -REF 8.33K Recorder Zero Suppression (Jumper Selectable) Resistor Values are in Ohms. Figure 5-10. Simplified Analog Output Circuit for Recorder (Showing Three Ranges) 5-14 Circuit Analysis Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 69: Service And Maintenance

    It is recommended that those familiar with circuit analysis refer to the circuit theory in Section 5 of this manual. Rosemount Analytical Inc. A Division of Emerson Process Management Service and Maintenance...

  • Page 70: Detector Component Checks

    See Section 6-3a on page 6-3. 3. Measure between the orange and red wires. The reading should be approximately the same as step 2. Service and Maintenance Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 71: Detector Component Replacement

    With all internal adjustments now properly set, the instrument may be calibrated in 4. Remove the two screws at the bottom the normal manner. of the detector assembly, slide detector out. Rosemount Analytical Inc. A Division of Emerson Process Management Service and Maintenance...

  • Page 72: Figure 6-1. Detector/Magnet Assembly

    Side View Connector Pin Removed of Connector Connector Pin/ Leads in Place Lower Slot Improvised Pin Removal Tool, Such as a Paper Clip Figure 6-2. Detector/Magnet Assembly Wiring Service and Maintenance Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 73: Source Lamp Replacement

    6-4, using method shown in Figure 6-2C lamp filaments in proper orientation. on page 6-4. If the lamp assembly removed from the instrument has two wires, proceed to step Rosemount Analytical Inc. A Division of Emerson Process Management Service and Maintenance...

  • Page 74: Figure 6-4. Modification Of 633689 Connector Board For Compatibility With Replacement Lamp

    Solder Side of Board (Backside) Figure 6-4. Modification of 633689 Connector Board for Compatibility with Replacement Lamp 1/4" Set Screw Red Mark for Alignment Figure 6-5. Lamp Alignment Service and Maintenance Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 75: Photocell Replacement And Adjustment

    RT1 resistance at ambient in, never soldered. If soldered, the fuse temperature. The voltmeter should now element may melt and open the circuit. show pulses of 120 VAC. Rosemount Analytical Inc. A Division of Emerson Process Management Service and Maintenance...

  • Page 76: Detector/Magnet Heating Circuit

    1M is incorrect, heater HR1 may be open. ohm at 25°C and approximately 149K ohms at operating temperature of 65°C. Service and Maintenance Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 77: Replacement Parts

    652220 Control Board exchange basis. Because of the exchange policy covering circuit boards, the following list does not include individual, circuit board mounted components. If circumstances necessitate Rosemount Analytical Inc. A Division of Emerson Process Management Replacement Parts...

  • Page 78: Matrix

    General Purpose W/ISA Type Z Purge General Purpose W/Tropicalization General Purpose with Purge with Tropicalization Special Code Operation 115V, 50/60 Hz 230V, 50/60 Hz Special Code Features as selected above Special 755A Example Replacement Parts Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 79: Return Of Material

    Rosemount Analytical Inc. Rosemount Return Authorization, prepaid, Customer Service Center to the address provided by Rosemount 1-800-433-6076 CSC. Rosemount Analytical Inc. Process Analytical Division Customer Service Center 1-800-433-6076 Rosemount Analytical Inc. A Division of Emerson Process Management Return of Material...
  • Page 80 Instruction Manual 245364-V Model 755A May 2002 Return of Material Rosemount Analytical Inc. A Division of Emerson Process Management...

  • Page 81: Appendix A - Vaisala Barometric Pressure Transducer

    Test points are provided on the circuit board for this adjustment. 6. Replace R97 on the door board with a 2 Meg Ohm, 1/4W, 1% resistor (provided). Rosemount Analytical Inc. A Division of Emerson Process Management Appendix A – Vaisala Pressure Transducer...

  • Page 82: Adjustment

    2 should now read zero. The noise should be less than ±1 count. Procedure is complete. Appendix A – Vaisala Pressure Transducer Rosemount Analytical Inc. A Division of Emerson Process Management...
  • Page 83 WARRANTY Goods and part(s) (excluding consumables) manufactured by Seller are warranted to be free from defects in workmanship and material under normal use and service for a period of twelve (12) months from the date of shipment by Seller. Consumables, glass electrodes, membranes, liquid junctions, electrolyte, o-rings, etc., are warranted to be free from defects in workmanship and material under normal use and service for a period of ninety (90) days from date of shipment by Seller.
  • Page 84 Instruction Manual 245364-V Model 755A May 2002 Emerson Process Management Rosemount Analytical Inc. Fisher-Rosemount GmbH & Co. Process Analytic Division Industriestrasse 1 63594 Hasselroth 1201 N. Main St. Germany Orrville, OH 44667-0901 T (330) 682-9010 T 49-6055-884 0 F (330) 684-4434 F 49-6055-884209 E gas.csc@emersonprocess.com...

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