Emerson Rosemount 248 Reference Manual
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Emerson Rosemount 248 Reference Manual

Emerson Rosemount 248 Reference Manual

Wireless temperature transmitter
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Reference Manual
00809-0100-4248, Rev DE
April 2024
Rosemount
™
248 Wireless Temperature
Transmitter

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Summary of Contents for Emerson Rosemount 248

  • Page 1 Reference Manual 00809-0100-4248, Rev DE April 2024 Rosemount ™ 248 Wireless Temperature Transmitter...
  • Page 2 Rosemount 248 Wireless Hardware Revision HART Device Revision Device Install Kit/DD Revision Device Revision 01, DD Revision 01 or greater Device Type 2676  WARNING Failure to follow these installation guidelines could result in death or serious injury. Ensure only qualified personnel perform the installation.
  • Page 3 NOTICE Before installing the wireless transmitters The Rosemount 248 Wireless Temperature Transmitter and all other wireless devices must be installed only after the Wireless Gateway has been installed and is functioning properly. Emerson recommends that wireless devices 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.

  • Page 5: Table Of Contents

    Chapter 6  Troubleshooting........................43 6.1 Overview.............................43 6.2 Device status information......................43 6.3 Transmitter troubleshooting....................46 6.4 LCD display troubleshooting....................47 6.5 Wireless network troubleshooting..................47 Appendix A  Reference data........................49 A.1 Product Certifications ......................49 A.2 Ordering information, specifications, and drawings............49 Appendix B  Alert message mapping......................51 Rosemount 248...
  • Page 6 Contents Reference Manual April 2024 00809-0100-4248 Emerson.com/Rosemount...

  • Page 7: Chapter 1 Introduction

    Reference Manual Introduction 00809-0100-4248 April 2024 1  Introduction 1.1  Product recycling/disposal Recycling of equipment and packaging must be taken into consideration and disposed of in accordance with local and national legislation/regulations. Rosemount 248...
  • Page 8 Introduction Reference Manual April 2024 00809-0100-4248 Emerson.com/Rosemount...

  • Page 9: Chapter 2 Configuration

    Sensor input trim example Fast Key sequence: 1, 2, 3, etc. 2.2  Sensor connections The Rosemount 248 Wireless Transmitter is compatible with a number of RTD and thermocouple sensor types. Figure 2-1 shows the correct input connections to the sensor terminals on the transmitter.
  • Page 10 Independent of lead wire resistance up to 5 Ω per lead. Unbalanced lead wire resistance is the maximum resistance differences between any two leads. Figure 2-1: Sensor Wiring A. Thermocouple and mV B. 4-wire RTD and Ω C. 3-wire RTD and Ω D. 2-wire RTD and Ω Emerson.com/Rosemount...
  • Page 11 C. 4-wire RTD and Ω D. T/C and mV Note Emerson provides 4-wire sensors for all single element RTDs. Use these RTDs in 3- or 2-wire configurations by leaving the unneeded leads disconnected and insulated with electrical tape. Figure 2-3: RTD Lead Wire Configurations per IEC 60751 A.
  • Page 12 3. Remove the LCD display (if applicable). 4. Loosen the captive screws and remove LCD adapter plate (if applicable). 5. Attach the sensor leads according to Figure 2-1. 6. Reattach and secure LCD adapter plate to 5 in-lbs of torque (if applicable). Emerson.com/Rosemount...

  • Page 13: Bench Top Configuration

    Send (F2) key. AMS configuration changes are implemented after the Apply button has been selected. The power module must be installed to provide power to the Rosemount 248 Wireless for configuration. To communicate with the transmitter: 1.
  • Page 14 If this occurs, then refer to Troubleshooting. AMS Device Manager and AMS Wireless Configurator When configuring the Rosemount 248 Wireless using AMS Device Manager or AMS Wireless Configurator, double-click the Rosemount 248 Wireless device icon (or right-click and select Con/Setup), then select the Configure Menu. AMS configuration changes are implemented after the Apply button has been selected.

  • Page 15: Device Network Configuration

    3. Select 3: Configure Update Rate. 4. When the device configuration is completed, remove the power module and replace the module cover.  CAUTION Only insert the power module when the device is ready to be commissioned. Use caution when handling the power module. Rosemount 248...
  • Page 16 3. Device Type 1. Identification 4. Device Revision 2. Revisions 5. Software Revision 3. Radio 6. Hardware Revision 4. Security 7. Transmit PWR Lvl 8. Min Brdcst Updt Rt Security 1. Write Protect 2. Lock Status 3. Over the Air Upgrade Emerson.com/Rosemount...
  • Page 17 1. Tag 2. Hi Alarm 2. Long Tag 3. Lo Alarm 3. Descriptor 4. Lo-Lo Alarm 4. Message 5. Date 6. Country 7. SI Unit Control Power 1. Power Mode 2. Power Source 3. AC Power Filter Security Rosemount 248...
  • Page 18 2. Sensor Status 3. Current Lower Trim 4. Current Upper Trim Simulate 5. Lower Sensor Trim 1. Sensor 6. Upper Sensor Trim 2. Electronics Temp 7. Recall Factory Trim 3. Supply Voltage Reset/Restore 1. Perform Master Reset 2. Restore Default Settings Emerson.com/Rosemount...
  • Page 19 Fast Keys: 3, 5, 2 If the transmitter's digital value for the primary variable does not match the plant’s standard calibration equipment, then Emerson recommends performing a sensor trim. The sensor trim function calibrates the sensor to the transmitter in temperature units or raw units.
  • Page 20 • 7 Upper Sensor Trim Note Emerson recommends performing lower offset trims first and upper slope trims second. 5. Answer the prompt about configuring device for steady state sensor drive. 6. Select the appropriate sensor trim units at the prompt.
  • Page 21 5. Select desired display options and click Enter. Configuring LCD display with AMS Device Manager Procedure 1. Right-click on the device and select Configure. 2. Select Configure Device Display button under Optional Setup. 3. Select desired display options and select Enter. Rosemount 248...
  • Page 22 HI alert value must be higher than the LO alert value. Both alert values must be within the temperature sensor limits. Figure 2-10: Rising Alert A. Units of measurement B. Alert "OFF" C. Alert "ON" D. Alert "OFF" E. Deadband F. Time G. Assigned value H. Alert set point Emerson.com/Rosemount...
  • Page 23 Reference Manual Configuration 00809-0100-4248 April 2024 Figure 2-11: Falling Alert A. Units of measurement B. Alert "OFF" C. Alert "ON" D. Alert "OFF" E. Assigned value F. Alert set point G. Deadband H. Time Rosemount 248...

  • Page 24: Remove Power Module

    2.5  Remove power module After the sensor and network have been configured, remove the Power Module and replace the module cover. Emerson recommends inserting the power module only when the device is ready to be commissioned.  CAUTION Exercise caution when handling the power module. The power module may be damaged if dropped from heights in excess of 20 feet (6 m).

  • Page 25: Chapter 3 Installation

    3.1.1  Power up sequence Emerson recommends installing the Rosemount 248 Wireless Transmitter and all other devices 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 Gateway, beginning with the closest.
  • Page 26 The electronics cover is tightened so that polymer contacts polymer. When removing the electronics cover, ensure that there is no damage done to the O-ring. If damaged, Emerson recommends replacing it with a Rosemount O-ring. Reattach cover. Ensure polymer contacts polymer (i.e. no O-ring visible).

  • Page 27: Mounting

    If the ambient temperature is 131 °F (55 °C) and the max process temperature to be measured is 1499 °F (815 °C), the maximum permissible temperature rise is the transmitter specification limit minus the ambient temperature (moves 85 to 55 °C), or 86 °F (30 °C). Rosemount 248...

  • Page 28: Physical Installation

    G. Power module cover 5. Attach the sensor wiring to the terminals as indicated on Figure 2-1. 6. Reattach and secure LCD display adapter plate to 5 in.-lb. of torque (if applicable). 7. Reattach the LCD display (if applicable). Emerson.com/Rosemount...
  • Page 29 11. Reattach and tighten the power module cover. 12.  Always ensure a proper seal by installing the electronics housing cover(s) so that polymer contacts polymer (i.e. no O-ring visible). Emerson recommends using Rosemount O-rings. 13.  Provide 1.75 in. (45 mm) of clearance for units without an LCD display. Provide 3 in.
  • Page 30  polymer (i.e. no O-ring visible). Use Rosemount O-rings. 14.  Provide 1.75 in. (45 mm) of clearance for units without an LCD display. Provide 3 in. (76 mm) of  clearance for units with an LCD display for cover removal. Emerson.com/Rosemount...
  • Page 31 4. Attach the LCD display on the LCD adapter plate, rotate to the desired position, and snap into place. 5. Reattach and tighten the transmitter enclosure cover. 6. Connect the Green Power Module. 7. Reattach and tighten the power module cover. Rosemount 248...
  • Page 32 Reference Manual April 2024 00809-0100-4248 8. Always ensure a proper seal by installing the covers so that polymer contacts polymer (i.e. no O-ring visible). Emerson recommends using Rosemount O-rings. To enable and configure the LCD display, refer to Configuring the LCD display.

  • Page 33: Chapter 4 Commissioning

    4.1.2  Field Communicator For HART communication, a Rosemount 248 Wireless Device Driver (DD) is required. To ® obtain the latest DD, see Emerson.com/Rosemount/Device-Install-Kits. The communication status may be verified in the wireless device using the following Fast Key sequence.
  • Page 34 When the device has joined the network, it will appear in the Wireless Configurator window as shown in Figure 4-2. For HART communication, a Rosemount 248 Wireless DD is ® required. To obtain the latest DD, see Emerson.com/Rosemount/Device-Install-Kits. Figure 4-2: AMS Wireless Configurator...

  • Page 35: Reference Information

    B. 4-Wire RTD and Ω C. 3-Wire RTD and Ω D. 2-Wire RTD and Ω Figure 4-4: Sensor Connections A. 2-wire RTD and Ω B. 3-wire RTD and Ω C. 4-wire RTD and Ω D. T/C and mV Rosemount 248...
  • Page 36 Commissioning Reference Manual April 2024 00809-0100-4248 Note Emerson provides 4-wire sensors for all single element RTDs. Use these RTDs in 3- or 2-wire configurations by leaving the unneeded leads disconnected and insulated with electrical tape. Wireless HART Table 4-2: Fast Key Sequences ®...
  • Page 37 IEC 60584 thermocouple colors ASTM E-230 thermocouple colors Type Positive (+) Negative (-) Positive (+) Negative (-) Black White White Green White Yellow Brown White Blue Note Dual thermocouple sensors are shipped with one pair of the wires shrink-wrapped together. Rosemount 248...
  • Page 38 Commissioning Reference Manual April 2024 00809-0100-4248 Emerson.com/Rosemount...

  • Page 39: Operation And Maintenance

    X X X X x x   Device Information - Tag: This is the user-entered tag which is eight characters long. It will not display if all characters are blank. A b c d e f g h   Rosemount 248...
  • Page 40 S u p l y 3. 6 0 v o l t s   Software Revision: This is the device software revision.   SV Screen: This is the terminal temperature value. TRMNL 2 5 . 0 0   Emerson.com/Rosemount...

  • Page 41: Power Module Replacement

    Use caution when handling the power module. It may be damaged if dropped from heights in excess of 20 ft (6.1m). Battery hazards remain when cells are discharged. Reference conditions are 70° F (21° C), transmit rate of once per minute, and routing data for three additional network devices. Rosemount 248...
  • Page 42 Environmental considerations As with any battery, local environmental rules and regulations must be consulted for proper management of spent batteries. If no specific requirements exist, then Emerson recommends recycling through a qualified recycler. For battery specific information, consult the material’s Safety Data Sheet.

  • Page 43: Chapter 6 Troubleshooting

    The device has detected an electronics error that does not currently impact the device measurement reading. Recommended actions 1. Reset the device. 2. Reconfirm all configuration items in the device. 3. If the condition persists, replace the electronics. Rosemount 248...
  • Page 44 3. If not needed, then disable this alert. 6.2.7  Lo alarm Description The primary variable has surpassed the user-defined limit. Recommended actions 1. Verify the process variable is within user-specified limits. 2. Reconfirm the user-defined alarm limit. 3. If not needed, then disable this alert. Emerson.com/Rosemount...
  • Page 45 The supply voltage is too low for the device to broadcast updates. Recommended actions Replace the power module. 6.2.12  Supply voltage low Description The supply voltage is low and may soon affect broadcast updates. Recommended actions Replace the power module. Rosemount 248...

  • Page 46: Transmitter Troubleshooting

    Low output or no output Potential cause Sensor element Recommended actions 1. Connect a communication device and enter the Transmitter test mode to isolate a sensor failure. 2. Check the process variable to see if it is out of range. Emerson.com/Rosemount...

  • Page 47: Lcd Display Troubleshooting

    2. Increase communication paths by adding more wireless points. 3. Check that device has been on line for at least an hour. 4. Check that device is not routing through a “limited” routing node. 5. Create a new network with an additional Wireless Gateway. Rosemount 248...
  • Page 48 Recommended actions 1. Check that Power Always On mode is off. 2. Verify device is not installed in extreme temperatures. 3. Verify device is not a network pinch point. 4. Check for excessive network rejoins due to poor connectivity. Emerson.com/Rosemount...

  • Page 49: Appendix A Reference Data

    A  Reference data A.1  Product Certifications To view current Rosemount 248 Wireless Temperature Transmitter Product Certifications: Procedure 1. Go to Emerson.com/Rosemount/Rosemount-248-Wireless. 2. Scroll as needed to the green menu bar and click Documents & Drawings. 3. Click Manuals & Guides.
  • Page 50 Reference data Reference Manual April 2024 00809-0100-4248 Emerson.com/Rosemount...

  • Page 51: Appendix B Alert Message Mapping

    84 Additional ® Status Field for the transmitter. The information in this section can be used by DeltaV ™ alert monitoring, and in the Emerson Wireless Gateway for Additional Status mapping in Modbus , OPC, etc. ® A complete list of additional status bits is available in the Wireless Gateway.
  • Page 52 The terminal temperature has exceeded Beyond Limits the transmitter’s maximum range. Supply Voltage Low Byte 8 :: Bit 4 The supply voltage is low and may soon affect broadcast updates. Location of the alert in the HART command 48 status field. Emerson.com/Rosemount...
  • Page 53 Reference Manual 00809-0100-4248 April 2024 Rosemount 248...
  • Page 54 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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