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Emerson Rosemount MCL-220 Manual

Monochloramine system with rosemount 1056 transmitter
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Manual
LIQ-MAN-MCL, Rev E
July 2017
™
Rosemount
MCL-220
Monochloramine System with Rosemount 1056 Transmitter

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Summary of Contents for Emerson Rosemount MCL-220

  • Page 1 Manual LIQ-MAN-MCL, Rev E July 2017 ™ Rosemount MCL-220 Monochloramine System with Rosemount 1056 Transmitter...
  • Page 2 Essential instructions Read this page before proceeding! Your purchase from Rosemount has resulted in one of the finest instruments available for your particular application. These instruments have been designed and tested to meet many national and international standards. Experience indicates that the instrument's performance is directly related to the quality of the installation and knowledge of the user in operating and maintaining the instrument.
  • Page 3 Rev level Date Notes 09/08 This is the initial release of the product manual. This manual has been reformatted to reflect the Emerson documentation style and updated to reflect any change in the prod- uct offering. 08/09 Updated ISO/DNV approval. 09/11...

  • Page 5: Table Of Contents

    Features ............................5 Specifications ..........................6 Ordering information ........................7 Chapter 3 Installation ........................9 Unpacking and inspection ......................9 3.1.1 Rosemount MCL-220 ....................... 9 Installation ............................. 9 3.2.1 General information ......................9 3.2.2 Sample requirements ....................10 3.2.3 Mounting, inlet, and drain connections ................. 10 3.2.4...
  • Page 6 Contents 6.4.3 Procedure - configuring alarms and assigning setpoints ..........36 6.4.4 Procedure - simulating alarms ..................37 6.4.5 Procedure - synchronizing timers ...................39 Configuring the measurement ..................... 40 6.5.1 Purpose ......................... 40 6.5.2 Definitions - chlorine ..................... 40 6.5.3 Procedure - configuring the measurement ..............
  • Page 7 Contents 9.3.7 Sensor 1 Not Detected ....................66 9.3.8 Sensor Factory Data, Sensor Board User Data, and Sensor EEPROM Write errors .... 67 9.3.9 Sensor ADC error ......................67 9.3.10 Sensor RTD Out of Range ....................67 Troubleshooting when a Warning message is showing ..............68 9.4.1 Sensor Need Factory Cal ....................
  • Page 8 Contents Rosemount MCL...

  • Page 9: Quick Start Guide

    Quick Start guide Quick Start guide For Rosemount MCL-220 Monochloramine System Prerequisites Refer to Chapter 3 for installation instructions and Chapter 4 for wiring instructions. Procedure Once connections are secured and verified, apply power to the transmitter. When the transmitter is powered up for the first time, Quick Start screens appear..
  • Page 10 Quick Start guide Choose the desired units for chlorine. Choose the desired temperature units. The main display appears. The outputs and alarms (if an alarm board is present) are assigned to default values. To change outputs, alarms, and other settings, go to the main menu and choose Program.
  • Page 11 Quick Start guide Instruction Manual...
  • Page 12 Quick Start guide Rosemount MCL...

  • Page 13: Description And Specifications

    Replacing the electrolyte solution takes only minutes. The Rosemount MCL-220 system includes an easy-to-use Rosemount 1056 transmitter that features two fully programmable 4-20 mA outputs and four fully programmable relays. The large back-lit display allows you to read monochloramine concentration at a glance.

  • Page 14: Specifications

    Description and Specifications Specifications Table 2-1: General Specifications Physical characteristics Specifications Sample requirements • Pressure: 3 to 65 psig (122 to 549 kPa abs). A check valve in the inlet prevents the sensor flow cells from going dry if sample flow is lost. The check valve opens at 3 psig (122 kPa abs).

  • Page 15: Ordering Information

    The MCL is not suitable for use in hazardous areas. Ordering information The Rosemount MCL-220 is a complete system for the determination of monochloramine in water. It consists of a monochloramine sensor, Rosemount 1056 transmitter, Variopol cable, and constant head overflow cup to control sample flow. All components are mounted on a backplate, and the cable is pre-wired to the transmitter.
  • Page 16 Description and Specifications Table 2-4: Component Parts Transmitter model Description 1056-03-24-38-AN Rosemount 1056 transmitter, single input (monochlora- mine), alarm relays, analog output, 115/230 Vac Sensor model Description 499ACL-03-54-VP Monochloramine sensor with Variopol connector Sensor cable Description 23747-04 Interconnecting cable, Variopol for Rosemount 499ACL sensor, 4 ft Table 2-5: Accessories...

  • Page 17: Chapter 3 Installation

    Rosemount immediately. 3.1.1 Rosemount MCL-220 The Rosemount MCL-220 consists of the following items mounted on a back plate. The Rosemount 1056-03-24-38-AN with sensor cable attached. Constant head overflow sampler with flow cell for monochloramine sensor. The monochloramine sensor (Rosemount 499ACL-03-54-VP), three membrane assemblies, and a bottle of electrolyte solution are in a separate package.

  • Page 18: Sample Requirements

    Pressure: 3 to 65 psig (122 to 549 kPa abs) Minimum flow: 3 gal/hr (11 L/hr) 3.2.3 Mounting, inlet, and drain connections The Rosemount MCL-220 is intended for wall mounting only. Refer to Figure 3-1 for details. The sensor screws into the flow cell adapter.

  • Page 19: Electrical Connections

    Installation Remove the foam packing insert between the outer tube and the inner overflow tube. Adjust the sample flow until the water level is even with the central overflow tube and excess water is flowing down the tube. 3.2.4 Electrical connections Refer to Section 4.1 for details.
  • Page 20 Installation Rosemount MCL...

  • Page 21: Chapter 4 Wiring

    Wiring Wiring Power, alarm, and output wiring WARNING! RISK OF ELECTRICAL SHOCK Electrical installation must be in accordance with the National Electrical Code (ANSI/NFPA-70) and/or any other applicable national or local codes. 4.1.1 Power Wire AC mains power supply to the power supply board, which is mounted vertically on the left hand side of the transmitter enclosure.

  • Page 22: Alarm Wiring

    Wiring Figure 4-1: Analog output connections The analog outputs are on the main board near the hinged end of the enclosure door. For best EMI/RFI protection, use shielded output signal cable enclosed in earth-grounded metal conduit. Keep output signal wiring separate from power wiring. Do not run signal and power or relay wiring in the same conduit or close together in a cable tray.

  • Page 23: Sensor Wiring

    Wiring Figure 4-2: Alarm relay connections Keep alarm relay wiring separate from signal wiring. Do not run signal and power or relay wiring in the same conduit or close together in a cable tray. Sensor wiring The Rosemount MCL is provided with sensor cables pre-wired to the transmitter. If it is necessary to replace the sensor cable, refer to the instructions below.
  • Page 24 Wiring Insert the new cable through the gland and pull the cable through the cable slot. Wire the sensor to the signal board. Figure 4-3. Figure 4-3: Rosemount 499ACL-03-54-60 Sensor Wiring to Rosemount 1056 Transmitter Once the cable has been connected to the board, slide the board fully into the enclosure while taking up the excess cable through the cable gland.

  • Page 25: Display And Operation

    Display and operation Display and operation Display The transmitter has a four line display. Figure 5-1. The display can be customized to meet your requirements. Refer to Section 5.6. Figure 5-1: Main Display When the transmitter is being programmed or calibrated, the display changes to a screen similar to the one shown in Figure 5-2.

  • Page 26: Keypad

    Display and operation Figure 5-3: Arrow Bar The arrow bar shows whether additional items in a list are available. Keypad Local communication with the transmitter is through the membrane keypad. Figure 5-4 Figure 5-5 explain the operation of the keys. Rosemount MCL...
  • Page 27 Display and operation Figure 5-4: Analyzer Keypad Four navigation keys move the cursor around the screen. The position of the cursor is shown in reverse video. The navigation keys are used to increase or decrease the value of a numeral. Press ENTER to select an item and store numbers and settings.

  • Page 28: Programming The Transmitter - Tutorial

    Display and operation Programming the transmitter - tutorial Setting up and calibrating the transmitter is easy. The following tutorial describes how to move around in the programming menus. For practice, the tutorial also describes how to assign ppm monochloramine values to the 4 and 20 mA analog outputs. Press MENU.
  • Page 29 Display and operation Press ENTER. The Output Range screen appears. The screen shows the present values assigned to output 1 (O1) and output 2 (O2). The screen also shows which sensors the outputs are assigned to. S1 is sensor 1. The assignments shown are the defaults for the MCL-220.

  • Page 30: Security

    Display and operation To return to the main menu, press MENU. To return to the main display, press MENU and then EXIT. Security 5.4.1 How the security code works Security codes prevent accidental or unwanted changes to program settings or calibrations.

  • Page 31: Using Hold

    Display and operation Using hold 5.5.1 Purpose To prevent unwanted alarms and improper operation of control systems or dosing pumps, place the alarms and outputs assigned to the sensor in hold before removing it for maintenance. Hold is also useful if calibration will cause an out of limits condition. During hold, outputs assigned to the sensor remain at the last value, and alarms assigned to the sensor remain in their present state.

  • Page 32: Configuring The Main Display

    Display and operation Select the sensor to be put in hold. Press ENTER. To put the sensor in hold, choose Yes. To take the sensor out of hold, choose No. Configuring the main display The main display can be configured to meet your requirements. Press MENU.
  • Page 33 Display and operation Scroll through the list of items and select the parameter you wish to be displayed. Once you are done making changes, press EXIT twice to return to the display menu. Press MENU and then EXIT to return to the main display. The following abbreviations are used in the quadrant display.
  • Page 34 Display and operation Rosemount MCL...

  • Page 35: Programming The Transmitter

    Programming the transmitter Programming the transmitter General This section describes how to make the following program settings using the local keypad. Configure and assign values to the analog current outputs. Configure and assign values to the alarm relays. Choose the type of chlorine measurement being made. This step is necessary because the transmitter used with the MCL can measure forms of chlorine other than monochloramine.
  • Page 36 Programming the transmitter Table 6-1: Default Settings (continued) Item Choices Default 7. Simulate 0.00 to 22.00 mA 12.00 mA Alarms 1. Logic high or low AL1 low, AL2, 3, 4, high 2. Assignments a. AL1 and AL2 monochloramine, temperature, fault, monochloramine (sensor 1) interval timer b.

  • Page 37: Configuring, Ranging, And Simulating Outputs

    Programming the transmitter Configuring, ranging, and simulating outputs 6.3.1 Purpose This section describes how to configure, range, and simulate the two analog current outputs. Important Configure the outputs first. Configuring an output means a. Assigning a sensor and measurement (monochloramine or temperature) to an output.

  • Page 38: Procedure - Configure Outputs

    Programming the transmitter and live. Fixed means the selected output goes to the previously programmed value (between 0.00 and 22.00 mA) when a fault occurs. Live means the selected output is unaffected when the fault occurs. Ranging an The outputs are fully rangeable, including negative numbers. If the output output is logarithmic, assigned values must be positive.

  • Page 39: Procedure - Ranging Outputs

    Programming the transmitter Choose Output 1 or Output 2. The screen shows the present configuration. There are six items: Assign (S1 is sensor 1), Range, Scale, Dampening, Fault Mode, and Fault Value. To display the fifth and sixth items, scroll to the bottom of the screen and continue scrolling. To make a change, move the cursor to the desired line and press ENTER.

  • Page 40: Procedure - Simulating Outputs

    Programming the transmitter Choose Range. Choose Output 1 or Output 2. The screen shows the present settings for the outputs. O1 is output 1, O2 is output 2, and S1 is sensor 1. To make a change, move the cursor to the desired line and press ENTER. A screen appears in which the present setting can be edited.
  • Page 41 Programming the transmitter The main Menu screen appears. Move the cursor to Program and press ENTER. The cursor is on Outputs. Press ENTER. Choose Simulate. Choose Output 1 or Output 2. Enter the desired simulated output current. Instruction Manual...

  • Page 42: Configuring Alarms And Assigning Setpoints

    To end the simulated current, press MENU or EXIT. Configuring alarms and assigning setpoints 6.4.1 Purpose The Rosemount MCL-220 transmitter has an optional alarm relay board. This section describes how to configure and assign setpoints to the alarm relays, simulate alarm action, and synchronize interval timers. Important Configure the alarms first.
  • Page 43 Programming the transmitter Figure 6-1: High Alarm Logic The alarm activates when the chlorine concentration exceeds the high setpoint. The alarm remains activated until the reading drops below the value determined by the deadband. Figure 6-2: Low Alarm Logic The alarm activates when the chlorine concentration drops below the low setpoint. The alarm remains activated until the reading increases above the value determined by the deadband.

  • Page 44: Procedure - Configuring Alarms And Assigning Setpoints

    Programming the transmitter Figure 6-3: Operation of the Interval Timer The numbers in parentheses are the allowed values for each timer parameter. Synchronize If two or more relays are being used as interval timers, choosing timer synchronize timers will cause each timer to start one minute later than the preceding timer.

  • Page 45: Procedure - Simulating Alarms

    Programming the transmitter Choose Configure/Setpoint. Choose Alarm 1, Alarm 2, Alarm 3, or Alarm 4. The screens summarizes the present configuration and setpoints. There are nine items: Setpoint, Assign (S1 is sensor 1), Logic, Deadband, Interval time, On time, Recover time, and Hold while active.
  • Page 46 Programming the transmitter Press MENU. The main Menu screen appears. Move the cursor to Program and press ENTER. Choose Alarms. Choose Simulate. Choose Alarm 1, Alarm 2, Alarm 3, or Alarm 4. Rosemount MCL...

  • Page 47: Procedure - Synchronizing Timers

    Programming the transmitter Choose Don't simulate, De-energize, or Energize. Press MENU or EXIT to end simulation. 6.4.5 Procedure - synchronizing timers Synch Timers is available only if two or more alarm relays have been configured as interval timers. Press MENU. The main Menu screen appears.

  • Page 48: Configuring The Measurement

    Programming the transmitter Configuring the measurement 6.5.1 Purpose This section describes the following: Program the transmitter to measure monochloramine using the 499ACL-03 sensor. This step is necessary, because the transmitter can be used with other sensors to measure other chlorine oxidants. Set the level of electronic filtering of the sensor current.

  • Page 49: Configuring Temperature Related Settings

    Programming the transmitter To make a change, move the cursor to the desired line and press ENTER. A screen appears in which the present setting can be edited. To store the setting, press ENTER. a. For Measurement, choose Chloramine. b. Leave Filter at the default value unless readings are noisy. To return to the main display, press MENU and then EXIT.

  • Page 50: Procedure - Configuring Temperature Related Settings

    Programming the transmitter measurement and calibration temperatures differ by no more than about 2 °C. Manual temperature correction is useful if the sensor temperature element has failed and a replacement sensor is not available. 6.6.3 Procedure - configuring temperature related settings Complete the following steps to set the temperature units and to select automatic or manual temperature correction.

  • Page 51: Configuring Security Settings

    Programming the transmitter Configuring security settings 6.7.1 Purpose This section describes how to set security codes. There are three levels of security. A user can view the default display and diagnostic screens only. A user has access to the calibration and hold menus only. A user has access to all menus.

  • Page 52: Resetting The Transmitter

    Programming the transmitter The screen shows the existing security codes. To make a change, move the cursor to the desired line and press ENTER. A screen appears in which the present setting can be edited. Press ENTER to store a change. The security code takes effect two minutes after pressing ENTER.
  • Page 53 Programming the transmitter Scroll to the bottom of the screen and continue scrolling until Reset Analyzer is highlighted. Press ENTER. Choose whether to reset all user-entered values (Factory Defaults), sensor calibration (Sensor Cal Only), or output calibration (Output Cal Only). If you choose Sensor Cal Only or Output Cal Only, a second screen appears in which you can select which sensor or output calibration to reset.
  • Page 54 Programming the transmitter Rosemount MCL...

  • Page 55: Chapter 7 Calibration

    Calibration Calibration Introduction The Calibrate menu allows you to do the following: Calibrate the temperature sensing element in the monochloramine sensor. Calibrate the monochloramine sensor. Calibrate the analog outputs. Calibrating temperature 7.2.1 Purpose The monochloramine sensor is a membrane-covered amperometric sensor. As the sensor operates, monochloramine diffuses through the membrane and is consumed at an electrode immediately behind the membrane.
  • Page 56 Calibration Press MENU. The main Menu screen appears. The cursor is on Calibrate. Press ENTER. Choose the sensor you wish to calibrate. Sensor 1 is the monochloramine sensor. Choose Temperature. Change the display to match the temperature read from the calibrated thermometer.

  • Page 57: Calibration - Monochloramine

    Calibration Calibration - monochloramine 7.3.1 Purpose Figure 7-1 shows, a monochloramine sensor generates a current directly proportional to the concentration of monochloramine in the sample. Calibrating the sensor requires exposing it to a solution containing no monochloramine (zero standard) and to a solution containing a known amount of monochloramine (full-scale standard).

  • Page 58: Procedure - Zeroing The Sensor

    Calibration 7.3.2 Procedure - zeroing the sensor Complete the following steps to calibrate the sensor with the zero standard. Remove the sensor from the flow cell and place it in the zero standard (deionized water). Be sure no air bubbles are trapped against the membrane. The sensor current drops rapidly at first and then gradually reaches a stable zero value.
  • Page 59 Calibration Choose Zero Cal. The transmitter automatically starts the zero calibration. If the zero calibration was successful, the following screen appears. If the zero current is moderately larger than expected, an error message appears. To force the transmitter to accept the zero current, choose Yes. To repeat the calibration, choose No.

  • Page 60: Procedure - Calibrating The Sensor

    Calibration The transmitter will not update the zero current. For troubleshooting assistance, see Section 9.5. To return to the main display, press MENU and then EXIT. 7.3.3 Procedure - calibrating the sensor Complete the following steps to calibrate the monochloramine sensor with the full scale standard solution.
  • Page 61 Calibration Choose In Process Cal. Follow the screen points. Once the reading is stable, press ENTER. Take the sample and press ENTER. At this point, the transmitter stores the present sensor current and temperature and uses those values in calibration. Determine the free chlorine concentration in the sample and enter the value in the screen below.

  • Page 62: Calibration - Analog Outputs

    Calibration Calibration - analog outputs 7.4.1 Purpose Although the transmitter analog outputs are calibrated at the factory, they can be trimmed in the field to match the reading from a standard milliameter. Both the low (0 or 4 mA) and high (20 mA) outputs can be trimmed. 7.4.2 Procedure Complete the following steps to calibrate the transmitter's analog outputs.
  • Page 63 Calibration Change the value in the display to match the reading from the milliameter. If the calibration was successful, the screen below appears. If the user enterd value is more than ±1 mA different from the nominal value, a possible error screen appears. To force the transmitter to accept the calibration, choose Yes.
  • Page 64 Calibration Rosemount MCL...

  • Page 65: Chapter 8 Maintenance

    Maintenance Maintenance Transmitter The transmitter used with the Rosemount MCL requires little maintenance. Clean the transmitter case and front panel by wiping with a clean soft cloth dampened with water only. Do not use solvents, like alcohol, that might cause a buildup of static charge.

  • Page 66: Cleaning The Membrane

    Maintenance clean the membrane every month and replace the membrane and electrolyte solution every two or three months. Actual cleaning and maintenance frequency can be determined only by experience. 8.2.2 Cleaning the membrane Keep the sensor free from dirt and algae. Periodically inspect the membrane. If it appears fouled and the sensor response is less than expected, clean the membrane by using a stream of water from a wash bottle.
  • Page 67 Maintenance Hold the sensor over a container with the cathode pointing down. Remove the fill plug. Allow the electrolyte solution to drain out. Wrap the plug with several turns of pipe tape and set aside. Prepare a new membrane. a. Hold the membrane assembly with the cup formed by the membrane and membrane holder pointing up.

  • Page 68: Constant Head Flow Controller

    Maintenance Constant head flow controller 8.3.1 General After a period of time, deposits may accumulate in the constant head overflow chamber and in the tubing leading to the flow cell. Deposits increase the resistance to flow and cause the flow to gradually decrease. Loss of flow may ultimately have an impact on the sensor performance.
  • Page 69 Maintenance Figure 8-2: Rosemount MCL Flow Controller Assembly Replacement Parts Instruction Manual...
  • Page 70 Maintenance Rosemount MCL...

  • Page 71: Chapter 9 Troubleshooting

    Troubleshooting Troubleshooting Overview The transmitter continuously monitors itself and the sensor for problems. When the transmitter identifies a problem, the word warning or fault appears intermittently in the lower line of the main display. When the fault or warning message appears, press DIAG for more information.

  • Page 72: Troubleshooting When A Fault Message Is Showing

    Troubleshooting For additional troubleshooting information, select the desired message and press ENTER. For more information, see Section 9.3. To return to the main display, press MENU and then EXIT. Troubleshooting when a Fault message is showing Fault message Explanation Section Main Board CPU Error Main board software is corrupted.

  • Page 73: Main Board Cpu, Main Board Factory Data, And Main Board User Data Errors

    Troubleshooting 9.3.1 Main Board CPU, Main Board Factory Data, and Main Board User Data errors These error messages mean the main board is corrupted or the eeprom data on the main board is corrupted. Cycle the power off and then on. If cycling the power does not help, call the factory.

  • Page 74: Sensor Cpu Error

    Troubleshooting 9.3.5 Sensor CPU Error This message means the sensor board software is corrupted. Cycle the power off and then on. If cycling the power does not help, call the factory. The sensor board must be replaced. 9.3.6 Sensor RTD Open The sensor used in the MCL contains a Pt 100 RTD (resistance temperature device) for measuring temperature.

  • Page 75: Sensor Factory Data, Sensor Board User Data, And Sensor Eeprom Write Errors

    Troubleshooting Procedure Confirm that the ribbon cable connecting sensor 1 (chlorine) board to the main board is plugged into the sensor 1 connector on the main board. Confirm that the ribbon cable is seated at both ends. 9.3.8 Sensor Factory Data, Sensor Board User Data, and Sensor EEPROM Write errors These messages mean factory eeprom data or user eeprom data on the sensor board is corrupted or the CPU on the sensor board is bad.

  • Page 76: Troubleshooting When A Warning Message Is Showing

    Troubleshooting Troubleshooting when a Warning message is showing Warning message Explanation Section Sensor Need Factory Cal The sensor was not calibrated at the factory. Section 9.4.1 Sensor Negative Reading The monochloramine reading is less than -0.5 Section 9.4.2 ppm. Sensor RTD Sense Open RTD sensor line is broken or not connected.

  • Page 77: Sensor Temperature High Or Low

    Troubleshooting Disconnect the white and white/red sense and return leads and measure the resistance between them. It should be less than 1 Ω. See Figure 9-4. Even though the sense line is open, the sensor is still usable. Use a wire jumper to connect the sense and return terminals on the sensor terminal strip.

  • Page 78: Zero Current Is Unstable

    Troubleshooting Has adequate time been allowed for the sensor to reach a minimum stable residual current? It may take several hours, sometimes as long as overnight, for a new sensor to stabilize. Check the membrane for damage and replace it if necessary. Be careful not to touch the membrane or cathode.

  • Page 79: Process Readings Are Erratic

    Troubleshooting CAUTION! EQUIPMENT DAMAGE Do not use a tissue to wipe the membrane. If cleaning the membrane does not remove the sensor response, replace the membrane and electrolyte solution. See the sensor instruction sheet for details. 9.5.4 Process readings are erratic. Readings are often erratic when a new sensor or rebuilt sensor is first placed in service.

  • Page 80: Sensor Does Not Respond To Changes In Monochloramine Level

    Troubleshooting b. Confirm that the nozzle is properly positioned in the flow cell. Line up your eye with the bottom of the membrane retainer. No gap should be visible between the end of the nozzle and membrane retainer. Is the sensor new or has it been recently serviced? New or rebuilt sensors may require several hours to stabilize.

  • Page 81: Troubleshooting When No Error Message Is Showing - General

    Troubleshooting loss in sensitivity. After about two or three months of operation, the sensitivity may start to drop rapidly. At this point, the electrolyte solution and membrane should be replaced. Refer to Section 8.2. Low readings can be caused by zeroing the sensor before the residual current has reached a stable minimum value.

  • Page 82: Current Output Too Low

    Troubleshooting 9.6.2 Current output too low Load resistance is too high. Maximum load is 600 Ω. 9.6.3 Alarm relays don't work. Verify the relays are properly wired. Verify the deadband is correctly configured. 9.6.4 Bubbles trapped against membrane. Section 9.5.5, step 4. Simulating inputs To check the performance of the transmitter, use a decade box and 1.5 V battery to simulate the current from the sensor.

  • Page 83: Simulating Temperature

    Troubleshooting The voltage of a fresh 1.5 volt battery is about 1.6 volt (1600 mV). Simulating temperature 9.8.1 General The MCL accepts a Pt100 RTD. The Pt100 RTD is a three-wire configuration. Figure 9-3. Figure 9-3: Three-Wire RTD Configuration Although only two wires are required to connect the RTD to the transmitter, using a third (and sometimes fourth) wire allows the transmitter to correct for the resistance of the lead wires and for changes in the lead wire resistance with temperature.
  • Page 84 Troubleshooting Figure 9-4: Simulating RTD Inputs To check the accuracy of the temperature measurement, set the resistor simulating the RTD to the values indicated in the table and note the temperature readings. The measured temperature might not agree with the value in the table. During sensor calibration, an offset might have been applied to make the measured temperature agree with a standard thermometer.
  • Page 85 Troubleshooting Temp. (°C) Pt 100 (Ω) 132.8 134.7 138.5 Instruction Manual...
  • Page 86 Troubleshooting Rosemount MCL...
  • Page 87 Troubleshooting Instruction Manual...
  • Page 88 Emerson Automation Solutions The Emerson logo is a trademark and service mark of Emerson 1 Pandan Crescent Electric Co. Rosemount is a mark of one of the Emerson family of Singapore 128461 companies. All other marks are the property of their respective Singapore owners.

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