Page 2 - Instruction Manual; Section 1 Introduction; Scope of Manual; To avoid personal injury or property; Description; WARNING; Specifications for the 846 transducer are listed in table 1-1.
Instruction Manual D102005X012 846 Transducer March 2015 2 Section 1 Introduction Scope of Manual This instruction manual provides installation, operating, calibration, maintenance, and parts ordering informationFisher 846 current‐to‐pressure transducers. Refer to separate manuals for instructions c...
Page 3 - Maximum particle density size:
Instruction Manual D102005X012 846 Transducer March 2015 3 Table 1-1. Specifications Input Signal Standard Performance: 4 to 20 mA DC, 4 to 12 mA DC, or 12 to 20 mA DC.Field adjustable split ranging. Multirange Performance: 4 to 20 mA DC. Consult factory for split range input. Equivalent Circuit See...
Page 4 - Emerson Process Management sales
Instruction Manual D102005X012 846 Transducer March 2015 4 Table 1-1. Specifications (continued) Performance (continued) (5) Electromagnetic Interference (EMI): Tested per IEC 61326‐1 (Edition 1.1). Meets emission levels for ClassA equipment (industrial locations) and Class Bequipment (domestic loca...
Page 5 - Declaration of SEP; may; Table 1-2. EMC Immunity Performance Criteria; Related Documents; Emerson Process Management sales office
Instruction Manual D102005X012 846 Transducer March 2015 5 Table 1-1. Specifications (continued) Declaration of SEP Fisher Controls International LLC declares thisproduct to be in compliance with Article 3 paragraph3 of the Pressure Equipment Directive (PED) 97 / 23 /EC. It was designed and manufact...
Page 6 - Figure 1-2. Transducer Modular Construction; Educational Services
Instruction Manual D102005X012 846 Transducer March 2015 6 Figure 1-2. Transducer Modular Construction A6643 MODULE COVER MODULE FINALASSEMBLY ELECTRONICCIRCUIT BOARD MODULE HOUSING TERMINAL BLOCK TERMINALCOMPARTMENTCOVER Figure 1-3. Equivalent Circuit NOTE:THE 846 IS NOT A CONSTANT RESISTOR IN SERI...
Page 7 - Section 2 Installation
Instruction Manual D102005X012 846 Transducer March 2015 7 Section 2 Installation 22 WARNING To avoid personal injury or property damage from the sudden release of pressure or air: D Always wear protective clothing, gloves, and eyewear when performing any installation operations. D Disconnect any ...
Page 8 - No special conditions for safe use.; Special Conditions of Use
Instruction Manual D102005X012 846 Transducer March 2015 8 WARNING Failure to follow these conditions of safe‐use could result in personal injury or property damage from fire or explosion, andarea re‐classification. CSA Intrinsically Safe, Explosion-proof, Non-Incendive No special conditions for saf...
Page 9 - Special Conditions for Safe Use
Instruction Manual D102005X012 846 Transducer March 2015 9 ATEX Special Conditions for Safe Use Intrinsically Safe This equipment is intrinsically safe and can be used in potentially explosive atmospheres. The apparatus must be only connected to a certified associated intrinsically safe equipment an...
Page 10 - The cable entry device used shall be certified Ex d IIB or Ex d IIC.
Instruction Manual D102005X012 846 Transducer March 2015 10 IECEx Special Conditions for Safe Use Intrinsically Safe No special conditions for safe use. Flameproof See below. Refer to table 2-4 for additional approval information. Table 2-4. Hazardous Area Classifications—IECEx Certificate Certifica...
Page 11 - Mounting; Pressure Connections
Instruction Manual D102005X012 846 Transducer March 2015 11 Mounting WARNING This unit will vent to the atmosphere through the stroke port in the module cover and the exhaust port, located under thenameplate. Do not remote vent this unit. The transducer is designed for mounting on a control valve, 5...
Page 16 - Figure 2-4. Typical Transducer Dimensions with Gauges
Instruction Manual D102005X012 846 Transducer March 2015 16 Figure 2-4. Typical Transducer Dimensions with Gauges SUPPLY GAGE 49 (1.92) 72 (2.83) 9 (0.36) 81 (3.2) OUTPUT GAGE FILTER‐REGULATOR 14B7332‐DE0776 1/4‐18 NPT OUTLET CONNPLUGGED WHENGAUGE NOTFURNISHED 67CFR14‐18 NPTSUPPLY CONN mm (INCH) Fig...
Page 17 - Electrical Connections
Instruction Manual D102005X012 846 Transducer March 2015 17 Output Pressure Connect the output signal line to the transducer at the output port. The output port is 1/4‐18 NPT, as shown in figure2-1. The output gauge port can be used as an alternate signal port. If the gauge port is used as a signal ...
Page 18 - Venting Ports; Stroke Port; Upon loss of input current, or if input current decreases below 3.3
Instruction Manual D102005X012 846 Transducer March 2015 18 Connect the positive signal lead to the positive terminal, marked +. Connect the negative signal lead to the negativeterminal, marked -. Note Units with the Remote Pressure Reading (RPR) option may cause interference with the analog output ...
Page 19 - Section 3 Calibration
Instruction Manual D102005X012 846 Transducer March 2015 19 Section 3 Calibration 33 WARNING The following calibration procedures require taking the transducer out of service. To avoid personal injury and propertydamage caused by an uncontrolled process, provide some temporary means of control for t...
Page 20 - Figure 3-1. Connecting a Current or Voltage Source for Calibration; CAUTION
Instruction Manual D102005X012 846 Transducer March 2015 20 Figure 3-1. Connecting a Current or Voltage Source for Calibration ADJUST THE CURRENTSOURCE TO PROVIDETHE 4 AND 20 mASET POINTS CALIBRATION USING A CURRENT SOURCE CALIBRATION USING A VOLTAGE SOURCE TO OBTAIN THE 4 AND 20 mASET POINTS, ADJUS...
Page 21 - Standard Performance: Full Range Input, Direct Action; Multirange Performance: Full Range Input,
Instruction Manual D102005X012 846 Transducer March 2015 21 Standard Performance: Full Range Input, Direct Action WARNING Refer to the WARNING at the beginning of the Maintenance section. Use the following procedure to achieve a standard 0.2 to 1.0 bar (3 to 15 psi) output span for a 4 to 20 mA inpu...
Page 22 - Standard Performance: Split Range Input, Direct Action; to 12 mA Input Signal; Repeat steps 2 and 3 to verify and complete the calibration.; unit may not turn down this low if it does not, go to step 7.
Instruction Manual D102005X012 846 Transducer March 2015 22 Use the following procedure with a multirange performance unit to achieve the desired direct action output span for a4 to 20 mA input signal: 1. Perform steps 1 through 9 of the calibration procedure for Standard Performance: Full Range Inp...
Page 23 - Repeat steps 4 and 5 to verify and complete the calibration.; Standard Performance: Full Range Input, Reverse Action; except for step 2. In place; Multirange Performance: Full Range Input, Reverse Action
Instruction Manual D102005X012 846 Transducer March 2015 23 6. Repeat steps 4 and 5 to verify and complete the calibration. 7. Turn off the air supply. Remove the module final assembly from the housing. Place the range jumper in the Lo position for Low Range, as indicated in figure 6-4. Replace the ...
Page 24 - Standard Performance: Split Range Input, Reverse Action; unit may not turn up this high if it does not, go to step 7.
Instruction Manual D102005X012 846 Transducer March 2015 24 3. Apply an input of 20.0 mA (Vm = 5.0 V), and adjust the span screw to achieve the desired lower limit of the output range. The span must be at least 0.7 bar (11.0 psi). The lower limit of the 20.0 mA setting is 0.03 bar (0.5 psi). Theoutp...
Page 25 - Transporting the Module Final Assembly
Instruction Manual D102005X012 846 Transducer March 2015 25 6. Repeat steps 4 and 5 to verify and complete the calibration. 7. If the 12.0 mA (Vm = 3.0 V) cannot be adjusted to 1.0 bar (15.0 psi) in step 4, turn off the air supply. Remove the module final assembly from the housing. Place the range j...
Page 26 - Section 4 Principle of Operation; Figure 4-1. Functional Parts Block Diagram; Electronic Circuit
Instruction Manual D102005X012 846 Transducer March 2015 26 Section 4 Principle of Operation 44 The following paragraphs describe the functional parts of the 846. Figure 4-1 shows the block diagram. Figure 4-1. Functional Parts Block Diagram 4 to 20 MA INPUT ELECTRONIC CIRCUIT MAGNETIC ACTUATOR PILO...
Page 27 - Magnetic Actuator
Instruction Manual D102005X012 846 Transducer March 2015 27 Magnetic Actuator The electronic circuit controls the level of current flowing through the actuator coil, which is located in thepilot/actuator assembly. A change to the level of coil current is made by the electronic circuit when it senses...
Page 28 - Booster Stage
Instruction Manual D102005X012 846 Transducer March 2015 28 Figure 4-3. Detail of Deflector/Nozzle Pilot Stage W6287 Booster Stage The receiver nozzle pressure controls the booster stage, which has a poppet valve design. An increase in receivernozzle pressure positions the valving in the booster sta...
Page 29 - Section 5 Troubleshooting; Diagnostic Features; Using a Frequency Counter to Read the RPR Signal
Instruction Manual D102005X012 846 Transducer March 2015 29 Section 5 Troubleshooting 55 The modular design and unitized subassemblies of the 846 allows for quick and easy troubleshooting and repair. Thissection presents information on the diagnostic features and procedures for troubleshooting both ...
Page 30 - ) Find frequencies at zero and span pressure.; In‐service Troubleshooting
Instruction Manual D102005X012 846 Transducer March 2015 30 1) Find frequencies at zero and span pressure. 2) Solve for m, using equation (2). 3) Solve for b by inserting m, initial pressure, and initial frequency into equation (1). 4) Insert m and b into equation (1) to find conversion formula. Pro...
Page 31 - Figure 5-2. Field Troubleshooting Flowchart
Instruction Manual D102005X012 846 Transducer March 2015 31 Figure 5-2. Field Troubleshooting Flowchart NOTE:AFTER FINAL CORRECTIVE ACTION, CHECK LOOP OPERATION.IF NOT OK, RESTART TROUBLESHOOTING PROCEDURE. 1 REFER TO REPLACING THE MODULE FINAL ASSEMBLYIN SECTION 6. TROUBLESHOOTING FROM THE CONTROL ...
Page 32 - confirm that proper input current is supplied to the transducer.; for an exploded view.
Instruction Manual D102005X012 846 Transducer March 2015 32 WARNING Personal injury or property damage could result from an uncontrolled process. Unscrewing the module cover removespower from the electronics and the output signal will be 0.0 psi. Before removing the module cover, ensure the process ...
Page 33 - Troubleshooting in the Shop; in the Maintenance section for complete; gently
Instruction Manual D102005X012 846 Transducer March 2015 33 Before making the following checks, disconnect both signal wires from the transducer, and ensure the module finalassembly is removed from the housing. 1. Using an ohmmeter, check the electrical connections in the housing terminal compartmen...
Page 35 - Section 6 Maintenance; Module Final Assembly
Instruction Manual D102005X012 846 Transducer March 2015 35 Section 6 Maintenance 66 This section describes the major components, assembly, and disassembly of 846 current‐to‐pressure transducers. WARNING To avoid personal injury or property damage from the sudden release of pressure or air: D Alway...
Page 39 - the O‐rings to ensure that they are not twisted or stretched.
Instruction Manual D102005X012 846 Transducer March 2015 39 3. Remove the module final assembly from the module cover. To accomplish this, hold the cover steady, and push the module final assembly in the direction of the module cover indicating boss. At the same time, lift the opposite footof the mo...
Page 40 - Electronic Circuit Board; Figure 6-4. Circuit Board Jumper Positions; Optional Remote Pressure Reading (RPR) Jumper
Instruction Manual D102005X012 846 Transducer March 2015 40 9. Hand tighten the module cover as much as possible. Use a wrench or long screwdriver shaft to tighten the module cover an additional 1/4 to 1/2 turn [24 to 27 N S m (18 to 20 lbf S ft)]. For units with ATEX/IECEx Flameproof approvals, mak...
Page 41 - Range Jumper; Removing the Electronic Circuit Board
Instruction Manual D102005X012 846 Transducer March 2015 41 that can be received by a frequency counter. Operation of the RPR feature is jumper‐selectable, in units so equipped.The RPR feature operates when the jumper is located in the N position on the circuit board. With the jumper in the Dpositio...
Page 42 - centered and in contact with the manifold, as shown in figure 6-5.; Pilot/Actuator Assembly
Instruction Manual D102005X012 846 Transducer March 2015 42 the O‐ring sizes. The pressure sensor may be gently bent away from the pressure sensor manifold to access the sensorO‐ring and confirm that the pressure ports are clear. Replacing the Electronic Circuit Board 1. Verify that the circuit boar...
Page 43 - Insert the wire into each nozzle
Instruction Manual D102005X012 846 Transducer March 2015 43 Figure 6-6. Pilot/Actuator Assembly (Bottom View) ALIGNMENTKEY RUBBERDIAPHRAGM MOUNTINGSCREWS A6654 Removing the Pilot/Actuator Assembly To remove the pilot/actuator assembly, disengage the four mounting screws, and gently pull the assembly...
Page 44 - Replacing the Pilot/Actuator Assembly; or red for pilot/actuators inserted into a reverse action unit.; Module Subassembly; Terminal Compartment
Instruction Manual D102005X012 846 Transducer March 2015 44 Figure 6-7. Cleaning the Nozzles A6655‐1 DEFLECTOR BAR WIRE WIRE PLASTIC HOUSING Replacing the Pilot/Actuator Assembly 1. Verify that the rubber diaphragm under the nozzle area is blue for pilot/actuators inserted into a direct action unit,...
Page 45 - Figure 6-8. Terminal Compartment Exploded View; Exhaust and Stroke Port Screens
Instruction Manual D102005X012 846 Transducer March 2015 45 The terminal compartment contains the terminal block, terminal block connection board, span and zero screws,electrical feedthroughs, and internal grounding lug, as shown in figure 6-8. The terminal block connection board isattached to the t...
Page 46 - Section 7 Parts; Parts Kit; Parts List
Instruction Manual D102005X012 846 Transducer March 2015 46 Section 7 Parts 77 Whenever corresponding with your Emerson Process Management sales office about this equipment, always mentionthe transducer serial number. WARNING Use only genuine Fisher replacement parts. Components that are not supplie...
Page 50 - Section 8 Installation Drawings
Instruction Manual D102005X012 846 Transducer March 2015 50 Section 8 Installation Drawings 8 This section includes installation drawings required for wiring of intrinsically safe installations. If you have anyquestions, contact your Emerson Process Management sales office . Figure 8-1. CSA Installa...
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