Emerson Rosemount 848T Reference Manual
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Emerson Rosemount 848T Reference Manual

Emerson Rosemount 848T Reference Manual

Wireless temperature transmitter
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Reference Manual
00809-0100-4848, Rev BC
June 2024
Rosemount
™
848T Wireless Temperature
Transmitter

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Summary of Contents for Emerson Rosemount 848T

  • Page 1 Reference Manual 00809-0100-4848, Rev BC June 2024 Rosemount ™ 848T Wireless 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 a Emerson Sales Representative.
  • Page 3 All wireless devices must be installed only after the Wireless Gateway has been installed and is functioning properly. Wireless devices must also be powered up in order of proximity from the Wireless Gateway, beginning with the closest. This will result in a simpler and faster network installation. For more information, see Emerson Wireless 1410 Gateway.

  • Page 5: Table Of Contents

    Chapter 5  Operation and Maintenance....................35 5.1 Calibration..........................35 5.2 Power module replacement.....................36 5.3 Spare parts..........................37 Chapter 6  Troubleshooting........................39 6.1 Device troubleshooting......................39 6.2 Wireless network troubleshooting..................42 Chapter 7  Appendix..........................43 7.1 Product certifications........................43 7.2 View ordering, information, specifications, and dimensional drawings......43 Rosemount 848T Wireless Temperature Transmitter...
  • Page 6 Contents Reference Manual June 2024 00809-0100-4848 Emerson.com/Rosemount...

  • Page 7: Chapter 1 Introduction

    Care must be taken to prevent thermal, electrical or mechanical damage. Contacts must be protected to prevent premature discharge. Use caution when handling the power module. It may be damaged if dropped from heights in excess of 20 ft. (6 m). Rosemount 848T Wireless Temperature Transmitter...

  • Page 8: Product Recycling/Disposal

    If the ambient temperature is outside of the specification limit, consider moving the transmitter to a location within the specified limits. 1.2  Product recycling/disposal Consider recycling equipment and packaging. Dispose of the product and packaging in accordance with local and national legislation. Emerson.com/Rosemount...

  • Page 9: Chapter 2 Configuration

    AMS Wireless Configurator AMS Wireless Configurator is capable of connecting to devices directly, using a HART ® modem, or wirelessly using the Emerson Smart Wireless Gateway. When configuring the device, double click the device icon or right click and select Configure. 2.2.1 ...

  • Page 10: Default Settings

    Configuration Reference Manual June 2024 00809-0100-4848 Figure 2-1: Field Communicator Connection A. Battery 2.3  Default settings The Rosemount 848T Wireless Transmitter default configuration: Type J Thermocouple Sensor 1 Sensor 2 Type J Thermocouple Type J Thermocouple Sensor 3 Sensor 4 Type J Thermocouple °C...
  • Page 11 1. From the Home screen, select 2: Configure. 2. Select 1: Guided Setup. 3. Select 2: Configure Update Rate, then follow the on-screen instructions to complete the configuration. • If using a Gateway, select Yes to enable optimizations. Rosemount 848T Wireless Temperature Transmitter...

  • Page 12: Sensor Configuration

    After the sensor and network parameters have been configured, remove the power module and close the housing cover. Note Only insert the power module when the device is ready for commissioning. NOTICE Use caution when handling the power module. It may be damaged if dropped. Emerson.com/Rosemount...

  • Page 13: Advanced Configuration (Optional)

      High alert configuration Low alert configuration Trigger point 212 °F (100 °C) 32 °F (0 °C) Dead band 41 °F (5 °C) 41 °F (5 °C) Rosemount 848T Wireless Temperature Transmitter...
  • Page 14 2. Select 2: Manual Setup. 3. Select 7: Security. 4. Select 1: Write Protect. 2.6.4  AC power filter Fast Keys 2, 2, 10, 2 The AC power filter can be set to reject line power noise at either 50 or 60 Hz. Emerson.com/Rosemount...
  • Page 15 A long tag (consisting of 32 characters) can be configured using the Fast Key sequence by selecting 2: Long Tag. Rosemount 848T Wireless Temperature Transmitter...
  • Page 16 8. RTD 2-wire offset 1. Process Sensors 5. Simulate 2. Electronics Temperature 3. Supply Voltage 1. Perform Master Reset 2. Measurement History 3. Advertise to New Devices 2.6.7  Fast Key sequences Table 2-1 lists the Fast Key sequences for common transmitter functions. Emerson.com/Rosemount...
  • Page 17 Network ID, Join Device to Network, Broadcast Information, including Update Rate and Messages Sensor Calibration 3, 4, 2–5 Sensor Status, Current Upper Trim, Current Lower Trim, Lower Sensor Trim, Upper Sensor Trim, Recall Factory Trim, RTD 2 Wire Offset Rosemount 848T Wireless Temperature Transmitter...
  • Page 18 Configuration Reference Manual June 2024 00809-0100-4848 Emerson.com/Rosemount...

  • Page 19: Chapter 3 Installation

    Emerson Wireless 1410 Gateway. Note Emerson recommends to have wireless devices be powered up in order of proximity from the Gateway, beginning with the closest. This will result in a simpler and faster network installation. Antenna position Emerson recommends that the antenna be positioned vertically and approximately 3 ft.

  • Page 20: Sensor Connections

    To ensure a proper sensor connection, anchor the sensor lead wires into the appropriate compression terminals and tighten the screws. Thermocouple or millivolt inputs Use appropriate thermocouple extension wire to remote mount the transmitter from the sensor. Make millivolt input connections with copper wire. Use shielding for long runs of wire. Emerson.com/Rosemount...
  • Page 21 Each adapter accommodates two voltage inputs, and can be installed interchangeably on Inputs 1 and 2, or 3 and 4.     To install voltage adapter: Procedure 1. Open Terminal Screws 2 and 3 on both inputs. Rosemount 848T Wireless Temperature Transmitter...
  • Page 22 4. Tighten all terminal screws to lock divider in place. 3.2.2  Wiring 0-10 volt inputs on the voltage adapter Wiring voltage 0-10 volt inputs using the adapter follows the same procedure as mV inputs and thermocouples. Figure 3-5 below shows how to connect the voltage leads. Emerson.com/Rosemount...
  • Page 23 If neither of these is practical, a sensor trim may be performed to compensate, assuming the source resistance is constant over the voltage range of interest the procedure for performing a Sensor trim. Rosemount 848T Wireless Temperature Transmitter...
  • Page 24 Cu (α Temperature 0.00385 Ω/Ω °C coefficient of Pt (α 25 °C Change in Ambient Temperature (ΔT 100 Ω (for Pt 100 RTD) RTD Resistance at 0 °C (R 3.2.4  Pt100 4-wire RTD No lead wire resistance effect. Emerson.com/Rosemount...
  • Page 25 5 ohm resistor to create a 20–100 mV signal. It is optimal to use a 5 ohm resistor with stable operation over the ambient temperature range where the 848T Transmitter is located. Figure 3-6 for information on wiring. Rosemount 848T Wireless Temperature Transmitter...
  • Page 26 Analog region Sensor Saturation > 21.71 > 108.55 Upper Alarm Sensor Out of Limits 20.8–21.71 104–108.55 Upper Saturation Good 3.9–20.8 19.5–104 Normal Region Sensor Out of Limits 3.79–3.9 18.95–19.5 Lower Saturation Sensor Saturation < 3.79 < 18.95 Lower Alarm Emerson.com/Rosemount...

  • Page 27: Physical Installation

    3. Run wiring (and conduit, if necessary) from the sensor to the 848T Transmitter. For an easier installation, use the outside conduit entries, as shown below. Note Any unused conduit entries must be sealed with an approved sealant using the included threaded conduit plug. Rosemount 848T Wireless Temperature Transmitter...
  • Page 28 Always ensure a proper seal by installing the electronics housing cover so that metal touches metal, but do not over tighten. 8. Position the antenna vertically. Note The antenna must be approximately 3-ft. (1 m) from any large structures or buildings to allow clear communication to other devices. Emerson.com/Rosemount...
  • Page 29 A. Shield ground point Grounded thermocouple option Procedure 1. Ground the sensor wiring shield at the sensor. 2. Ensure the sensor wiring and shield is electrically isolated from the transmitter housing and Terminal Screw 5. Rosemount 848T Wireless Temperature Transmitter...
  • Page 30 2. The 4–20 mA signal shield should be electrically isolated from the 848T Transmitter housing and the 4–20 mA device to ensure a single point ground. A. 4–20 mA device B. Power supply C. 5 ohm D. Shield ground point Emerson.com/Rosemount...

  • Page 31: Chapter 4 Commissioning

    For more information on a specific device, click on the tag name. 4.3  Verify operation Operation can be verified using one of three methods: Field Communicator, the Wireless Gateway’s integrated web interface, or using AMS Wireless Configurator. Rosemount 848T Wireless Temperature Transmitter...
  • Page 32 Advertisements Heard, Number of Available Neighbors, Number of Join Attempt Emerson Wireless Gateway In the Gateway’s integrated web interface, navigate to the Explorer page. This page shows whether the device has joined the network, and if it is communicating properly.
  • Page 33 Reference Manual Commissioning 00809-0100-4848 June 2024 Rosemount 848T Wireless Temperature Transmitter...
  • Page 34 Commissioning Reference Manual June 2024 00809-0100-4848 Emerson.com/Rosemount...

  • Page 35: Operation And Maintenance

    1. From the Home screen, choose 3: Service Tools. 2. Choose 4: Maintenance. 3. Choose 2-5: Calibrate Sensor 1, 2, 3, or 4, depending on what selection is made. 4. Choose 7: Recall Factory Trim. Rosemount 848T Wireless Temperature Transmitter...

  • Page 36: Power Module Replacement

    Dangerous Goods (ARD). It is the responsibility of the shipper to ensure compliance with these or any other local requirements. Note Consult current regulations and requirements before shipping. Reference conditions are 70 °F (21 °C), transmit rate of once per minute, and routing data for three additional network devices. Emerson.com/Rosemount...

  • Page 37: Spare Parts

    Kit, Spare cable gland, ½-NPT, thin wire, 3 mm - 8mm (Qty 1) 00648-9010-0003 Mounting bracket for 2-in. pipe mount - SST bracket and bolts 00848-4350-2001 M20 cable gland adapter (Qty 4) 00849-1605-0001 O-ring is included. Rosemount 848T Wireless Temperature Transmitter...
  • Page 38 Operation and Maintenance Reference Manual June 2024 00809-0100-4848 Emerson.com/Rosemount...

  • Page 39: Chapter 6 Troubleshooting

    The electronics temperature is outside of the operating range of the transmitter. Recommended actions 1. Make sure the device is installed in an environment within the device operating temperature range. 2. Contact a service center if the condition persists. Rosemount 848T Wireless Temperature Transmitter...
  • Page 40 The process temperature value has saturated and can no longer track the actual process temperature measurement. Recommended actions 1. Verify that the process temperature is within the valid operating limits of the temperature sensor and device. 2. Replace the temperature sensor. 3. Contact a service center if the condition persists. Emerson.com/Rosemount...
  • Page 41 1. Disable any simulation values. 2. Contact a service center if the condition persists. 6.1.13  Supply Voltage Failure Cause The supply voltage is too low for the device to function properly. Recommended actions Replace the power module. Rosemount 848T Wireless Temperature Transmitter...

  • Page 42: Wireless Network Troubleshooting

    1. Check that Power Always On mode is Off. 2. Verify the device is not installed in extreme temperatures. 3. Verify that the device is not a network pinch point. 4. Check for excessive network rejoins from poor connectivity. Emerson.com/Rosemount...

  • Page 43: Chapter 7 Appendix

    3. Click Manuals & Guides. 4. Select the appropriate Quick Start Guide. 7.2  View ordering, information, specifications, and dimensional drawings To view current Rosemount 848T Wireless ordering information, specifications, and dimensional drawings: Procedure 1. Go to Emerson.com/Rosemount/848T Wireless Temperature Transmitter.
  • Page 44 Emerson Terms and Conditions of Sale are available upon request. The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a mark of one of the Emerson family of companies. All other marks are the property of their respective owners.

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