Emerson Rosemount 148 Reference Manual
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Emerson Rosemount 148 Reference Manual

Emerson Rosemount 148 Reference Manual

Temperature transmitter
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Reference Manual
00809-0100-4148, Rev DA
June 2019
™
Rosemount
148 Temperature Transmitter

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Summary of Contents for Emerson Rosemount 148

  • Page 1 Reference Manual 00809-0100-4148, Rev DA June 2019 ™ Rosemount 148 Temperature Transmitter...
  • Page 2 CAUTION The products described in this document are NOT designed for nuclear-qualified applications. Using non-nuclear qualified products in applications that require nuclear-qualified hardware or products may cause inaccurate readings. For information on Rosemount nuclear-qualified products, contact an Emerson Sales Representative.

  • Page 3: Table Of Contents

    2.4 Set the switches..........................15 2.5 Wiring............................16 2.6 Power supply..........................20 Chapter 3 Configuration.......................25 3.2 Safety messages..........................25 3.3 Rosemount 148 PC Programmer ....................25 Chapter 4 Operation and Maintenance..................31 4.1 Safety messages..........................31 4.2 Hardware............................31 Chapter 5 Reference Data......................35...
  • Page 4 Contents Reference Manual June 2019 00809-0100-4148 www.Emerson.com...

  • Page 5: Chapter 1 Introduction

    Reference Manual Introduction 00809-0100-4148 June 2019 Introduction Safety messages Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations. Information that potentially raises safety issues is indicated by a warning symbol . Refer to the following safety messages before performing an operation preceded by this symbol.

  • Page 6: Overview

    Operation and Maintenance • Explanation of hardware maintenance Transmitter Features of the Rosemount 148 include: • Accepts inputs from a wide variety of RTD and thermocouple sensors • Electronics that are completely encapsulated in silicone and enclosed in a plastic housing, making the transmitter extremely durable, and ensuring long-term reliability.

  • Page 7: Considerations

    Location Take into account the need for access to the transmitter when choosing an installation location. Special mounting Special hardware is available for mounting a Rosemount 148 head mount transmitter to a DIN rail. 1.3.3 Electrical Proper electrical installation is necessary to prevent errors due to sensor lead resistance and electrical noise.

  • Page 8: Return Of Materials

    8 °C (46.4 °F), thereby reducing any temperature effects in the transmitter. Return of materials To expedite the return process in North America, call the Emerson National Response Center toll-free at 1-800-654-7768. This center, available 24 hours a day, can assist with any needed information or materials.

  • Page 9: Product Recycling/Disposal

    Outside of North America, contact a local Emerson representative. Product recycling/disposal Recycling of equipment and packaging should be taken into consideration and disposed of...
  • Page 10 Introduction Reference Manual June 2019 00809-0100-4148 www.Emerson.com...

  • Page 11: Chapter 2 Installation

    Reference Manual Installation 00809-0100-4148 June 2019 Installation Safety messages Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations. Information that potentially raises safety issues is indicated by a warning symbol . Refer to the following safety messages before performing an operation preceded by this symbol.

  • Page 12: Mounting

    To attach a head mount transmitter to a DIN rail, assemble the appropriate rail mounting kit (part number 00248-1601-0001) to the transmitter as shown in Figure 2-1. Figure 2-1: Assembling Rail Clip Hardware to a Rosemount 148 A. Mounting hardware B. Transmitter C. Rail clip Installation ™...
  • Page 13 Reference Manual Installation 00809-0100-4148 June 2019 2.3.1 Head mount transmitter with DIN plate style sensor This type of installation is typical in Europe and Asia Pacific. Procedure 1. Attach the thermowell to the pipe or process container wall. 2. Install and tighten thermowells before applying process pressure. 3.
  • Page 14 12. Seal conduit threads with silicone tape. 13. Pull the field wiring leads through the conduit into the universal head. 14. Attach the sensor and power leads to the transmitter. Avoid contact with other terminals. 15. Install and tighten the universal head cover. www.Emerson.com...

  • Page 15: Set The Switches

    20.5 mA. Corresponding NAMUR compliant operation levels are 3.80 and 20.5 mA. These values are also custom configurable by the factory or using the Rosemount 148 PC Programmer interface. See Configuration for instructions on how to change the alarm and saturation levels with the 148 PC Programmer.

  • Page 16: Wiring

    2-4. Use extreme caution when making contact with the leads and terminals. 3. Tighten the terminal screws. 4. Reattach and tighten the cover, if applicable. All connection head covers must be fully engaged to met explosion-proof requirements. 5. Apply power (see “Power supply”) www.Emerson.com...
  • Page 17 Reference Manual Installation 00809-0100-4148 June 2019 Example Figure 2-4: Rosemount 148 Wiring 1.30 (33) 1.77 (45) A. Sensor terminals B. Power/communication terminals Signal loop may be grounded at any single point or left ungrounded. 2.5.1 Sensor connections ™ The Rosemount 148 is compatible with a number of RTD and thermocouple sensor types.
  • Page 18 RTD or ohm inputs The Rosemount 148 will accept a variety of RTD configurations, including 2-, 3-, and 4- wire designs. If the transmitter is mounted remotely from a 3- or 4-wire RTD, it will operate within specifications, without recalibration, for lead wire resistances of up to 60 Ω...
  • Page 19 Reference Manual Installation 00809-0100-4148 June 2019 Examples of approximate lead wire resistance effect calculations Given: Total cable length: 150 m Imbalance of the lead wires at 20 °C: 0.5 Ω Resistance/length (18 AWG Cu): 0.025 Ω/m °C Temperature coefficient of Cu (α 0.039 Ω/Ω...

  • Page 20: Power Supply

    Use this method for grounded housing. Procedure 1. Connect sensor wiring shield to the transmitter housing. 2. Ensure the sensor shield is electrically isolated from surrounding fixtures that may be grounded. 3. Ground signal wiring shield at the power supply end. www.Emerson.com...
  • Page 21 Reference Manual Installation 00809-0100-4148 June 2019 Figure 2-6: Option 1L Grounded Housing A. Sensor wires B. Transmitters C. DCS host system D. Shield ground point Ground the transmitter: Option 2 Use this method for grounded housing. Procedure 1. Connect signal wiring shield to the sensor wiring shield. 2.
  • Page 22 2. Ensure that the sensor wiring and signal wiring shields are electrically isolated from the transmitter housing. Do not connect the signal wiring shield to the sensor wiring shield. 3. Ground signal wiring shield at the power supply end. www.Emerson.com...
  • Page 23 Reference Manual Installation 00809-0100-4148 June 2019 Figure 2-9: Option 4: Grounded Thermocouple Inputs A. Sensor wires B. Transmitters C. DCS host system D. Shield ground point...
  • Page 24 Installation Reference Manual June 2019 00809-0100-4148 www.Emerson.com...

  • Page 25: Chapter 3 Configuration

    Physical security is an important part of any security program and fundamental to protecting your system. Restrict physical access by unauthorized personnel to protect end users’ assets. This is true for all systems used within the facility. Rosemount 148 PC Programmer ™ The Rosemount 148 Temperature Transmitter must be configured for certain basis variables to operate.
  • Page 26 ™ The Rosemount 148 PC Programming Kit includes configuration software and a communication modem. The Rosemount 148 device will need an external power supply of 12–42.4 Vdc for configuration. Procedure 1. Hook up the transmitter and a load resistor (250–1100 Ω) wired in series with the power supply.
  • Page 27 Advanced Settings, which include all of the configuration variables that can be set for the Rosemount 148. Any changes to the configuration must be sent to the transmitter by selecting the Send to Transmitter button on the right of the screen. The current configuration of the connected Rosemount 148 may be viewed by selecting the Load From Transmitter button.
  • Page 28 100–110 °C , and the damping is set to five seconds, the transmitter calculates and reports a new reading using the damping equation. At five seconds, the transmitter outputs 106.3 °C, or 63.2 percent of the input change, and the output continues to approach the input curve according to the above equation. www.Emerson.com...
  • Page 29 Reference Manual Configuration 00809-0100-4148 June 2019 Figure 3-1: Change in Input vs. Change in Output with Damping Set to Five Seconds Alarm and saturation Alarm direction, low alarm level, high alarm level, low saturation, and high saturation values can be set here. Rosemount and NAMUR standard values can be found on Failure mode or user-configured values may be entered.
  • Page 30 Shows the reading used by the onboard RTD to compensate temperature the cold junction of thermocouples. Status indicator Two buttons that indicate if the device is in Sensor Malfunction buttons or Transmitter Malfunction. Device identification This shows revisions for the software, hardware, and final assembly number. www.Emerson.com...

  • Page 31: Operation And Maintenance

    Reference Manual Operation and Maintenance 00809-0100-4148 June 2019 Operation and Maintenance Safety messages Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations. Information that potentially raises safety issues is indicated by a warning symbol . Refer to the following safety messages before performing an operation preceded by this symbol.
  • Page 32 Do not remove the thermowell while in operation. Select any standard, off-the-shelf sensor for use with a Rosemount 148 Tramsmitter or consult the factory for a special replacement sensor and transmitter combination.
  • Page 33 Reference Manual Operation and Maintenance 00809-0100-4148 June 2019 Table 4-1: Rosemount 148 Troubleshooting Chart (continued) Symptom Potential source Corrective action Loop wiring • Check for adequate voltage to the transmitter. It should be 12.0–42.4 V dc (over entire 3.75–23 mA operating range).
  • Page 34 Operation and Maintenance Reference Manual June 2019 00809-0100-4148 www.Emerson.com...

  • Page 35: Chapter 5 Reference Data

    3. Select Manuals & Guides. 4. Select the appropriate Quick Start Guide. Ordering Information, Specifications, and Drawings To view current Rosemount 148 Ordering Information, Specifications, and Drawings, follow these steps: Procedure 1. Go to Emerson.com/Rosemount/Rosemount-148. 2. Scroll as needed to the green menu bar and select Documents & Drawings.
  • Page 36 Emerson Terms and Conditions of Sale are available upon request. The Emerson logo is a Facebook.com/Rosemount trademark and service mark of Emerson Electric Co. Rosemount is a mark of one of the Youtube.com/user/RosemountMeasurement Emerson family of companies. All other marks are the property of their respective owners.

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