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2.2

Mounting

Mount the transmitter at a high point in the conduit run to prevent moisture from draining
into the transmitter housing.

The Rosemount

™

 148 Temperature Transmitter installs:

•

In a connection head or universal head mounted directly on a sensor assembly

•

Apart from a sensor assembly using a universal head

•

To a DIN rail using an optional mounting clip

2.2.1

Mounting a Rosemount 148 to a DIN Rail

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

    C

B

A

A. Mounting hardware

B. Transmitter

C. Rail clip

2.3

Installation

The Rosemount

™

 148 Temperature Transmitter can be ordered assembled to a sensor

with the XA option code and thermowell or as a stand-alone unit. If ordered without the
sensor assembly, use the following guidelines when installing the transmitter with an
integral sensor assembly.

Installation

Reference Manual

June 2019

00809-0100-4148

12

www.Emerson.com

Summary of Contents for Rosemount 148

Page 1: ...Reference Manual 00809 0100 4148 Rev DA June 2019 Rosemount 148 Temperature Transmitter ...

Page 2: ... one international number Customer Central 1 800 999 9307 7 00 am to 7 00 pm CST National Response Center 1 800 654 7768 24 hours a day Equipment service needs International 1 952 906 8888 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 ca...

Page 3: ... 12 2 3 Installation 12 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 5 1 Product Certifications 35 5 2 Ordering Information Specifications and Drawings 35 Reference Manual Contents 00809 0100 4148...

Page 4: ...Contents Reference Manual June 2019 00809 0100 4148 iv www Emerson com ...

Page 5: ...ppropriate hazardous locations certifications All connection head covers must be fully engaged to meet explosion proof requirements Process leaks could result in death or serious injury Do not remove the thermowell while in operation Install and tighten thermowells and sensors before applying pressure Electrical shock could cause death or serious injury Use extreme caution when making contact with...

Page 6: ...TD 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 A compact size and multiple housing options allow mounting flexibility in the field Model code option that allows it to be assembled to any sensor thermowell and extension accessory Refer to the following ...

Page 7: ... 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 For best results shielded cable should be used in e...

Page 8: ... C 185 F If the ambient temperature is 55 C 131 F and the process temperature to be measured is 800 C 1472 F the maximum permissible connection head temperature rise is the transmitter specification limit minus the ambient temperature moves from 85 to 55 C or 30 C 86 F In this case an extension of 100 mm 3 94 in meets this requirement but 125 mm 4 92 in provides a margin of 8 C 46 4 F thereby redu...

Page 9: ...Sheet MSDS required by law to be available to people exposed to specific hazardous substances must be included with the returned materials Outside of North America contact a local Emerson representative 1 5 Product recycling disposal Recycling of equipment and packaging should be taken into consideration and disposed of in accordance with local and national legislation regulations Reference Manual...

Page 10: ...Introduction Reference Manual June 2019 00809 0100 4148 10 www Emerson com ...

Page 11: ...ppropriate hazardous locations certifications All connection head covers must be fully engaged to meet explosion proof requirements Process leaks could result in death or serious injury Do not remove the thermowell while in operation Install and tighten thermowells and sensors before applying pressure Electrical shock could cause death or serious injury Use extreme caution when making contact with...

Page 12: ...ount 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 C B A A Mounting hardware B Transmitter C Rail clip 2 3 Installation The Rosemount 148 Temperature Transmitter can be ordered assembled to a sensor with the XA option code and thermowell or as a s...

Page 13: ...nnection head a Thread the transmitter mounting screw into the connection head mounting holes b Assemble the extension to the connection head c Insert the assembly into the thermowell 6 Slip the shielded cable though the cable gland 7 Attach a cable gland into the shielded cable 8 Insert the shielded cable leads into the connection head through the cable entry 9 Connect and tighten the cable gland...

Page 14: ...to the thermowell 6 Install drain seals if required for severe environments or to satisfy code requirements 7 Pull the sensor wiring leads through the universal head and transmitter 8 Mount the transmitter in the universal head by threading the transmitter mounting screws into the universal head mounting holes 9 Mount the transmitter sensor assembly into the thermowell 10 Seal adapter threads with...

Page 15: ...ocess temperature value is out of range the transmitter outputs default saturation values Low end saturation levels are either 3 90 or 3 80 mA and the high end saturation level is 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 o...

Page 16: ...ly high voltage e g AC line voltage to the transmitter terminals since abnormally high voltage can damage the unit Sensor and transmitter power terminals are rated to 42 4 Vdc Note The transmitters will accept inputs from a variety of RTD and thermocouple types Refer to Figure 2 5 when making sensor connections Use the following steps to wire the transmitter Procedure 1 Remove the terminal block c...

Page 17: ...is compatible with a number of RTD and thermocouple sensor types Figure 2 5 shows the correct input connections to the sensor terminals on the transmitter To ensure a proper sensor connection anchor the sensor lead wires into the appropriate compression terminals and tighten the screws CAUTION Use extreme caution when making contact with the leads and terminals Reference Manual Installation 00809 ...

Page 18: ...th ambient temperature variations Using the same type of wire on all lead wires will make the installation as accurate as possible When using a 4 wire RTD the effect of lead resistance is eliminated and has no impact on accuracy A 3 wire sensor will not fully cancel lead resistance error because it cannot compensate for imbalances in resistance between the lead wires Using the same type of wire on...

Page 19: ... 0 039 Ω Ω C Temperature coefficient of Pt αPt 0 00385 Ω Ω C Change in Ambient Temperature ΔTamb 25 C RTD Resistance at 0 C Ro 100 Ω for Pt 100 RTD Pt100 4 wire RTD No lead wire resistance effect Pt100 3 wire RTD Lead wire imbalance seen by the transmitter 0 5 Ω Pt100 2 wire RTD Lead wire resistance seen by the transmitter 150 m 2 wires 0 025 Ω m 7 5 Ω Reference Manual Installation 00809 0100 4148...

Page 20: ... ground the loop is at the negative terminal of the power supply Do not ground the current signal loop at more than one point The transmitter is electrically isolated at 500 Vac rms 707 Vdc at 50 60 Hz so the input circuit may also be grounded at any single point When using a grounded thermocouple the grounded junction serves as this point Note Do not ground the signal wire at both ends Ungrounded...

Page 21: ...he sensor wiring shield 2 Ensure the two shields are tied together and electrically isolated from the transmitter housing 3 Ground shield at the power supply end only 4 Ensure the sensor shield is electrically isolated from the surrounding grounded fixtures Figure 2 7 Option 2 Grounded Housing D B A C A Sensor wires B Transmitters C DCS host system D Shield ground point Reference Manual Installati...

Page 22: ...y end Figure 2 8 Option 3 Grounded or Ungrounded Housing A B D C A Sensor wires B Transmitters C DCS host system D Shield ground point Ground the transmitter Option 4 Use this method for grounded thermocouple inputs Procedure 1 Ground sensor wiring shield at the sensor 2 Ensure that the sensor wiring and signal wiring shields are electrically isolated from the transmitter housing Do not connect th...

Page 23: ...Figure 2 9 Option 4 Grounded Thermocouple Inputs A B D C A Sensor wires B Transmitters C DCS host system D Shield ground point Reference Manual Installation 00809 0100 4148 June 2019 23 ...

Page 24: ...Installation Reference Manual June 2019 00809 0100 4148 24 www Emerson com ...

Page 25: ...rmowell while in operation Install and tighten thermowells and sensors before applying pressure Electrical shock could cause death or serious injury Use extreme caution when making contact with the leads and terminals Physical access Unauthorized personnel may potentially cause significant damage to and or misconfiguration of end users equipment This could be intentional or unintentional and needs...

Page 26: ...he first available COM port 3 3 2 Rosemount 148 programming Table 3 1 Programming Kit Spare Part Numbers Product description Part number Programming software CD 00148 1601 0002 Rosemount 148 programmer kit USB 00148 1601 0003 Rosemount 148 programmer kit serial 00148 1601 0004 3 3 3 PC Programmer hardware setup The Rosemount 148 PC Programming Kit includes configuration software and a communicatio...

Page 27: ...ers It can be used to label transmitters electronically according to the requirements of the application The tag may be up to eight characters in length and does not impact the measurement of the transmitter Sensor configuration The following sensors indicate the sensor type and the number of wires to be connected 2 3 or 4 wire Pt 100 α 0 00385 Ω C 2 3 or 4 wire Pt 100 α 0 003916 Ω C 2 3 or 4 wire...

Page 28: ...g value increases the transmitter response time With damping enabled the transmitter outputs values according to the following relationship At time t Damping value At the time the damping time constant is set the transmitter output is at 63 percent of the input changes and it continues to approach the input according to the damping equation above After one damping time constant following a sensor ...

Page 29: ...t be 3 8 3 9 mA The high saturation level must be between 20 5 mA and the high alarm value minus 0 1 mA Example The highalarm value has been set to 20 8 mA so the low saturation level S must be 20 5 20 7 mA See Failure mode considerations 50 60 Hz selection The 50 60 Hz selection sets the transmitter electronic filter to reject the frequency of the AC power supply in the plant Write protect Write ...

Page 30: ...smitter temperature Shows the reading used by the onboard RTD to compensate the cold junction of thermocouples Status indicator buttons Two buttons that indicate if the device is in Sensor Malfunction or Transmitter Malfunction Device identification This shows revisions for the software hardware and final assembly number Configuration Reference Manual June 2019 00809 0100 4148 30 www Emerson com ...

Page 31: ...n head covers must be fully engaged to meet explosion proof requirements Process leaks could result in death or serious injury Do not remove the thermowell while in operation Install and tighten thermowells and sensors before applying pressure Electrical shock could cause death or serious injury Use extreme caution when making contact with the leads and terminals Physical access Unauthorized perso...

Page 32: ...Table 4 1 Rosemount 148 Troubleshooting Chart Symptom Potential source Corrective action High output Sensor input failure or connection Check for a sensor open or short circuit Check the process variable to see if it is out of range Loop wiring Check for dirty or defective terminals interconnecting pins or receptacles Power supply Check the output voltage of the power supply at the transmitter ter...

Page 33: ...ltage to the transmitter It should be 12 0 42 4 V dc over entire 3 75 23 mA operating range Check for shorts and multiple grounds Check for proper polarity at the signal terminal Check the loop impedance Check wire insulation to detect possible shorts to ground Reference Manual Operation and Maintenance 00809 0100 4148 June 2019 33 ...

Page 34: ...Operation and Maintenance Reference Manual June 2019 00809 0100 4148 34 www Emerson com ...

Page 35: ...rmation 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 3 For installation drawings select Drawings Schematics and select the appropriate document 4 For ordering information specifications and dime...

Page 36: ...witzerland 41 0 41 768 6111 41 0 41 768 6300 RFQ RMD RCC Emerson com Asia Pacific Regional Office Emerson Automation Solutions 1 Pandan Crescent Singapore 128461 65 6777 8211 65 6777 0947 Enquiries AP Emerson com Middle East and Africa Regional Office Emerson Automation Solutions Emerson FZE P O Box 17033 Jebel Ali Free Zone South 2 Dubai United Arab Emirates 971 4 8118100 971 4 8865465 RFQ RMTMEA...

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