Emerson ROSEMOUNT 242 Instruction Manual
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Emerson ROSEMOUNT 242 Instruction Manual

Flow-through toroidal conductivity sensor
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Instruction Manual
PN 51-242/rev E
March 2012
Model 242
Flow-Through Toroidal Conductivity Sensor

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Summary of Contents for Emerson ROSEMOUNT 242

  • Page 1 Instruction Manual PN 51-242/rev E March 2012 Model 242 Flow-Through Toroidal Conductivity Sensor...
  • Page 2 Application compat ibility is entirely the respon- in place, except when maintenance is being performed by qualified sibility of the user. persons, to prevent electrical shock and personal injury. Emerson Process Management Rosemount Analytical Inc. 2400 Barranca Parkway Irvine, CA 92606 USA...

  • Page 3: Table Of Contents

    MODEL 242 TABLE OF CONTENTS MODEL 242 TOROIDAL CONDUCTIVITY SENSOR TABLE OF CONTENTS Section Title Page MODEL 242 SENSOR ..................... Features and Applications..................Specifications ......................Ordering Information ....................Installation ........................ Calibration ........................ Maintenance ......................Troubleshooting ..................... Replacement Parts....................General ........................Remove the Sensor From the Process ..............
  • Page 4 Notes 11/02 This is the initial release of the product manual. The manual has been reformatted to reflect the Emerson documentation style and updated to reflect any changes in the product offering. 8/03 Corrected wiring references in text and drawings. Added information regarding ATEX approvals with Model 5081T.

  • Page 5: Model 242 Sensor

    MODEL 242 SECTION 1.0 242 SENSOR SECTION 1.0 242 SENSOR • FLOW THROUGH DESIGN is ideal for use with viscous, abrasive, or fibrous process liquids. • OVER 250 CONFIGURATIONS to meet customers' needs. • REPLACEABLE LINER in glass-filled PEEK, TEFLON, or ALUMINA reduces long-term operating costs.

  • Page 6: Specifications

    MODEL 242 SECTION 1.0 MODEL 242 SENSOR 1.2 SPECIFICATIONS The Model 242 Flow Through Sensor comprises a toroid housing constructed from 316 stainless steel and polyeth- yleneterephthalate, process connection flanges of 316 stainless steel, two metal contact rings (available in choice Pt 100 RTD of three materials), an insulating liner (choice of three materials), O-rings (choice of three materials), a Pt 100...
  • Page 7 MODEL 242 SECTION 1.0 MODEL 242 SENSOR FIGURE 1-1. Pressure - Temperature Specifications for 1”, 1.5”, and 2” (25, 40, and 50 mm) Sensors: Models 242-02, 242-03, and 242-04 FIGURE 1-2. Pressure - Temperature Specifications for 3” and 4” (80 and 100 mm) Sensors: Models 242-06 and 242-08...
  • Page 8 MODEL 242 SECTION 1.0 MODEL 242 SENSOR FIGURE 1-3. Pressure - Temperature Specifications for 1” and 2” Sensors: Alumina Liner FIGURE 1-4. Pressure - Temperature Specifications for 3” and 4” Sensors: Alumina Liner...

  • Page 9: Ordering Information

    MODEL 242 SECTION 1.0 MODEL 242 SENSOR 1.3 ORDERING INFORMATION The 242 Flow-Through Sensor is configurable to meet the needs of many applications and installations (both ANSI and DIN). After specifying line size and flange type, the customer selects the wetted materials most compat- ible with the process stream.
  • Page 10 MODEL 242 SECTION 1.0 MODEL 242 SENSOR ACCESSORIES PART NUMBER DESCRIPTION 23909-00 Extension cable, Pre-prepped, for connection to Instrument Models 54eC, 1055, 3081T, 4081T, 5081-T, and Xmt-T (Specify length) KIT PN DESCRIPTION FOR SENSOR MODELS 24005-00 Kit, Liner, 1” DN 25, Teflon PTFE 242-02[ ]TE[ ] 24005-01 Kit, Liner, 1”...

  • Page 11: Installation

    MODEL 242 SECTION 1.0 MODEL 242 SENSOR 1.4 INSTALLATION Installation of the Model 242 Flow Through Sensor is simi- lar to installation of a section of pipe. Consequently, be In the instructions below, the Junction Box is installed prepared to use tools, supplies, equipment, and tech- after the sensor is bolted into the process line.
  • Page 12 MODEL 242 SECTION 1.0 MODEL 242 SENSOR INSTALLING THE SENSOR IN THE PROCESS LINE 1. Install process flanges in accordance with applicable instructions, standards, and local regulations. 2. Position the sensor between the process mating flanges with flange gaskets inserted between each set of flanges.
  • Page 13 MODEL 242 SECTION 1.0 MODEL 242 SENSOR ATTACHING THE JUNCTION BOX Pull the sensor wires up into the junction box. Screw the junction box onto the threaded male connection on the sensor. Use of pipe sealing tape or other compound is at the discretion of the customer.

  • Page 14: Calibration

    MODEL 242 SECTION 1.0 MODEL 242 SENSOR EXTENSION CABLE HOOK UP 4. Connect the 8 wires of the extension cable to the terminal block inside the sensor junction box as 1. Do not run sensor cable in conduit or open trays indicated in Figure 1-7.
  • Page 15 MODEL 242 SECTION 1.0 MODEL 242 SENSOR FIGURE 1-10. Extension Cable to Model 54eC Wiring NOTE: If wiring to a single channel 1055-21 or to a dual channel 1055-21-xx or 1055- xx-31, the toroidal sensor is wired only to Terminal Blocks 3 and 4.
  • Page 16 MODEL 242 SECTION 1.0 MODEL 242 SENSOR SELECT HI OR * Applies only to 3081T and 4081T. FIGURE 1-12. Extension Cable to Models 3081T, FIGURE 1-13. Extension Cable to Model 81T 4081T, and 5081T Wiring Wiring FIGURE 1-14. Extension Cable to Model Xmt Pipe/Wall Mount Enclosure...

  • Page 17: Maintenance

    MODEL 242 SECTION 1.0 MODEL 242 SENSOR FIGURE 1-15. Extension Cable to Model Xmt Panel Mount Enclosure A. To perform liquid calibration prior to installing the sensor in the process line, first seal one end of the sensor, and then proceed with the following steps. 1.

  • Page 18: Troubleshooting

    MODEL 242 SECTION 2.0 TROUBLESHOOTING SECTION 2.0 TROUBLESHOOTING 2.1 TROUBLESHOOTING. The simplest method of trou- TABLE 2-1 Resistance Values for Pt100 RTD bleshooting is to run a resistance test on the inductive sensing device. It is also recommended to check the Temperature Resistance resistance of the RTD and resistance between various...
  • Page 19 MODEL 242 SECTION 2.0 MODEL 242 SENSOR The green wire from the extension cable’s black-green-clear bundle might be connected opposite the sensor’s orange wire, as indicated by to utilize the sensor’s alternative cell constant. FIGURE 2-1. Sensor Circuit for Troubleshooting...

  • Page 20: Replacement Parts

    MODEL 242 SECTION 3.0 REPLACEMENT PARTS SECTION 3.0 REPLACEMENT PARTS 3.1 GENERAL NOTE REGARDING O-RINGS When replacement parts are required, ensure that There are two pairs of O-rings inside the sensor: qualified people install the parts specified by process O-rings (item 6) and secondary or backup Rosemount.

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