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Emerson Fisher 546NS Instruction Manual

Electro-pneumatic transducer
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Instruction Manual
D103425X012
Fisher
546NS Electro-Pneumatic Transducer
™
Contents
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Introduction

Scope of Manual

This instruction manual provides installation, operation, maintenance, and parts ordering information for the Fisher
546NS transducer and the 82 relay. Refer to separate manuals for instructions covering equipment used with the
transducer.
www.Fisher.com
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Figure 1. Fisher 546NS Electro-Pneumatic Transducer
Mounted on a 657 Pneumatic Diaphragm Actuator
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546NS Transducer
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Table of Contents
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Summary of Contents for Emerson Fisher 546NS

  • Page 1: Table Of Contents

    546NS Electro-Pneumatic Transducer ™ Contents Figure 1. Fisher 546NS Electro‐Pneumatic Transducer Mounted on a 657 Pneumatic Diaphragm Actuator Introduction ....... . .

  • Page 2: Description

    If you have any questions about these instructions, contact your Emerson sales office before proceeding. Description The 546NS transducer (figure 1) receives either a voltage (VDC) or a current (mA DC) input signal and transmits a proportional pneumatic output pressure to a final control element.

  • Page 3: Specifications

    Upon conclusion of the above tests, no loss of function or visible degradation was found. Educational Services For information on available courses for the 546NS transducer, as well as a variety of other products, contact: Emerson Automation Solutions Educational Services - Registration Phone: 1-641-754-3771 or 1-800-338-8158 E-mail: [email protected]...
  • Page 4 Instruction Manual 546NS Transducer June 2021 D103425X012 Table 1. Specifications Available Configuration Performance Actuator Loading Time: See figure 6 Electro‐pneumatic signal transducer with explosion‐proof case and cover, with EPDM : ±0.75% of the output span Reference Accuracy elastomers for use in elevated temperature and Independent Linearity: ±0.50% of the output span radiation environments Open Loop Gain: 26...

  • Page 5: Installation

    Instruction Manual 546NS Transducer D103425X012 June 2021 Table 1. Specifications (continued) Adjustments Approximate Weight 4.1 kg (9 pounds) Zero and Span Adjustments: Screwdriver adjustments located inside case (see figure 4) Declaration of SEP Fisher Controls International LLC declares this product to be in compliance with Article 4 paragraph Connections 3 of the Pressure Equipment Directive (PED) 2014/68/EU.

  • Page 6: Hazardous Area Classifications

    Note This information supplements the nameplate markings affixed to the product. Always refer to the nameplate itself to identify the appropriate certification. Contact your Emerson sales office approval/certification information not listed here. CSA and FM No special conditions of safe use.

  • Page 7: Mounting

    40 micrometers in diameter will suffice in most applications, check with an Emerson Automation Solutions field office and industry instrument air quality standards for use with corrosive air or if you are unsure about the proper amount or method of air filtration or filter maintenance.

  • Page 8: Electrical Connections

    Instruction Manual 546NS Transducer June 2021 D103425X012 Figure 2. Diagnostic Connections SUPPLY PIPE NIPPLE (OUTPUT CONN) GAUGE PIPE TEE PIPE BUSHING STEM PROVIDED WHEN GAUGE IS SPECIFIED BODY BODY PROTECTOR 12B8041‐B A6072‐1 Install the connectors and hardware between the transducer and the actuator. 1.

  • Page 9: Operating Information

    Instruction Manual 546NS Transducer D103425X012 June 2021 Figure 3. Typical Circuit Drawings 450 OHMS OHMS INPUT INPUT 90 OHMS 1010 INPUT 176 OHMS OHMS 500 OHMS THERMISTOR DC SIGNAL: 4 TO 20 MILLIAMPS DC SIGNAL: 10 TO 50 MILLIAMPS DC SIGNAL: 1 TO 9 VOLTS ADJUST RESISTANCE ACROSS INPUT TERMINALS TO 1300 OHMS NOTE:...

  • Page 10: Calibration

    Instruction Manual 546NS Transducer June 2021 D103425X012 Figure 4. Zero and Span Adjustments (Cover Removed) ZERO ADJUSTMENT SPAN ADJUSTMENT W5391/IL The zero adjustment is used to set the output pressure so that it corresponds to the proper value of the input signal. For example, if the output range is 0.2 to 1.0 bar (3 to 15 psig) and the input range is 4 to 20 mA DC and the unit is direct‐acting, use the zero adjustment to set the output pressure at 0.2 bar (3 psig) when the input signal is 4 mA DC.
  • Page 11 Instruction Manual 546NS Transducer D103425X012 June 2021 1. Check the supply pressure to ensure it agrees with the minimum pressure on the transducer nameplate. 2. Adjust the input current to 4.00 mA DC. 3. Turn the zero screw until the output pressure is 0.2 ±0.006 bar (3.00 ±0.09 psig). 4.

  • Page 12: Recalibration

    Maintenance section. Note Re‐magnetization of the torque motor is required when changing the output pressure range. Contact your Emerson sales office service center. Reversing the Action Reversing the action of a 546NS transducer requires no special parts. The direction of armature rotation is dependent upon the direction of the current flow.

  • Page 13: Split Range Operation

    Instruction Manual 546NS Transducer D103425X012 June 2021 Split Range Operation The 546NS transducer is suitable for two‐way split range operation. In a two‐way split the milliampere (mA) or voltage output signal of a single control device is split between two transducers electrically connected in series. Although each transducer receives the full signal, it is calibrated to provide a full output pressure range of 0.2 to 1.0 bar (3 to 15 psig) or 0.4 to 2.0 bar (6 to 30 psig) to the control valve with one‐half the input signal.

  • Page 14: Principle Of Operation

    Instruction Manual 546NS Transducer June 2021 D103425X012 Principle of Operation Refer to the schematic drawing in figure 5. Assume that the transducer is direct‐acting. An increase in the DC signal to the coils increases the magnetic field around the coils. This field increases the magnetic strength in the armature and the magnetic attraction across the air gap between the armature and the pole pieces.

  • Page 15: Maintenance

    Instruction Manual 546NS Transducer D103425X012 June 2021 The output decreases until the diaphragm assembly is forced back to its original position and the exhaust port is closed again. The reduced pressure in the feedback bellows diminishes the force to return the armature to the equilibrium position.

  • Page 16: Relay Removal And Replacement

    CAUTION The presence of Emerson Automation Solutions personnel and also approval agency personnel may be required if you service (other than normal, routine maintenance, such as calibration) or replace components on a transducer that carries a third‐party approval.

  • Page 17: Replacing The Feedback Bellows Assembly

    Troubleshooting This section contains some checks for operational difficulties that may be encountered. If correcting the difficulties is not possible, contact your Emerson sales office or service center. Electrical 1. Check the output of the control device. Make sure that it is reaching the transducer.

  • Page 18: Alignment

    40 micrometers in diameter will suffice in most applications, check with an Emerson Automation Solutions field office and industry instrument air quality standards for use with corrosive air or if you are unsure about the proper amount or method of air filtration or filter maintenance.

  • Page 19: Torque Motor Frame

    Torque Motor Frame The top pole piece plate (key 50, figure 8) of the torque motor can become twisted with respect to the bottom pole piece plate (key 51, figure 8). If this happens contact your Emerson sales office. Armature Travel Stop The armature travel stop (key 52, figure 8) must be in place to prevent overstressing the armature and coil support (key 41, figure 8) due to over‐travel.

  • Page 20: Filter Regulator

    WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson should not, under any circumstances, be used in any Fisher instrument. The use of components not manufactured by Emerson Automation Solutions may void your warranty, might adversely affect the performance of the instrument, and could result in personal injury or property damage.

  • Page 21: Torque Motor

    Instruction Manual 546NS Transducer D103425X012 June 2021 Figure 7. Transducer Assembly 82 RELAY TORQUE MOTOR FILTER REGULATOR FLAME ARRESTOR FLAME ARRESTOR APPLY LUBRICANT/SEALANT NOTE: KEY 4 NOT SHOWN 30A8595‐L B1768‐3 Description Description  28 Machine Screw  29 O‐Ring  31 Hex Nut  32 Washer Torque Motor (figure 8)
  • Page 22 Instruction Manual 546NS Transducer June 2021 D103425X012 Figure 8. Torque Motor Assembly APPLY LUBRICANT/SEALANT NOTES: 1. SHADED KEY NUMBERS INDICATE PARTS THAT SHOULD NOT BE DISASSEMBLED FROM TORQUE MOTOR. 2. KEY NUMBERS 22 AND 103 ARE NOT SHOWN. 30A8594‐K B1767‐3 Description Description  51...

  • Page 23: Relay

    Instruction Manual 546NS Transducer D103425X012 June 2021 Figure 9. Fisher 82 Relay Assembly RESTRICTION HOLES APPLY LUBRICANT/SEALANT NOTE: KEY 76 IS NOT SHOWN A1504‐1 Relay (figure 9) Note The 546NS relay is not repairable. If the relay is defective, order the 82 Relay Replacement Assembly (refer to Parts Kits).

  • Page 24: Mounting Parts

    Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.

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