Emerson Rosemount 228 Reference Manual
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Emerson Rosemount 228 Reference Manual

Toroidal conductivity sensors
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Reference Manual
LIQ-MAN-228, Rev V
April 2018
™
Rosemount
228
Toroidal Conductivity Sensors

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Summary of Contents for Emerson Rosemount 228

  • Page 1 Reference Manual LIQ-MAN-228, Rev V April 2018 ™ Rosemount Toroidal Conductivity Sensors...
  • Page 3 Safety Information WARNING! HIGH PRESSURE AND TEMPERATURE HAZARD Before removing the senosr, reduce the process pressure to 0 psig and cool down the process temperature. Failure to reduce the pressure and temperature may cause serious injury to personnel. CAUTION! EQUIPMENT DAMAGE The wetted sensor materials may not be compatible with process composition and operating conditions.

  • Page 5: Table Of Contents

    Calibrating against a Referee - in-Process ..................25 Calibrating against a Referee - Grab Sample ................. 26 Chapter 5 Maintaining and Troubleshooting .................. 29 Maintaining the sensor .........................29 Troubleshooting .......................... 29 Chapter 6 Accessories ........................31 Chapter 7 Return of Materials ......................33 Rosemount 228 Sensor...
  • Page 6 Contents Reference Manual...

  • Page 7: Description And Specifications

    Table 1-2: Maximum operating temperature and pressure Maximum pressure (for Body material option Maximum temperature Maximum pressure CRN registration only) -02 (Glass-filled PEEK 248 °F (120 °C) 295 psig (2135 kPa) 220 psig (1618 kPa [abs]) (standard temperature)) Rosemount 228 Sensor...
  • Page 8 Description and specifications Table 1-2: Maximum operating temperature and pressure (continued) Maximum pressure (for Body material option Maximum temperature Maximum pressure CRN registration only) -03 (Glass-filled PEEK (high 392 °F (200 °C) 295 psig (2135 kPa) 220 psig (1618 kPa [abs]) temperature)) -04 (Glass-filled Tefzel) 248 °F (120 °C)
  • Page 9 Ball valve specifications (sold separately) Specification Description Part number 9340065 Wetted materials 316 stainless steel, Teflon TFE Process connection 1-1/2 in. FNPT Weight / shipping weight 4 lb / 5 lb (2.0 kg / 2.5 kg) Ball valve pressure and temperature Rosemount 228 Sensor...

  • Page 10: Ordering Information

    Description and specifications Ordering information Table 1-7: Rosemount 228 Toroidal Conductivity Sensor Ordering Information Model Sensor type Toroidal Conductivity Sensor Materials of construction Glass-filled PEEK (standard temperature) Glass-filled PEEK (high temperature) Glass-filled Tefzel Unfilled Tefzel Process connection 5/8 in. 11 UNC 3/4 in.

  • Page 11: Chapter 2 Install

    Mounting the sensor in a vertical pipe run with the flow from bottom to top is best. If the sensor must be mounted in a horizontal pipe run, orient the sensor in the 3 o-clock or 9 o'clock position. Figure 2-1: Rosemount 228 dimensional drawing Rosemount 228 Sensor...
  • Page 12 Install Figure 2-2: Insertion adapter 23242-02 for use with 3/4 in. MNPT threaded process connection (-21 option) Reference Manual...
  • Page 13 Install Figure 2-3: Insertion adapter 23242-03 for use with 5/8 in. 11 UNC threaded process connection (-20 option) Rosemount 228 Sensor...

  • Page 14: Insertion/Retraction Assembly Installation Requirements

    Install Figure 2-4: Insertion adapter 2001990 for use with 3/4 in. MNPT threaded process connection (-21 option) Procedure Mount the sensor in the pipe. Keep at least 1 in. (2.5 cm) between the sensor and pipe walls. If the clearance is too small, calibrate the sensor in place. Mount the sensor in a vertical pipe run with flow from top to bottom.

  • Page 15: Manual Retraction Assembly

    Provide 1/8 in. valves in inlet and outlet flush ports. Position flush ports so that the retraction chamber can be drained. 2.2.1 Manual Retraction Assembly Installing a Manual Retraction Assembly Loosen the collet nut and retract the sensor tube into the retraction chamber. Figure 2-5. Rosemount 228 Sensor...
  • Page 16 Install Figure 2-5: Manual retraction assembly dimensional drawing Loosen the union nut and separate the retraction chamber from the assembly. Install the retraction chamber on the 1-1/2 in. NPT full port valve mounted on the process line or vessel. Thread the sensor cable through the tube into the junction box. Screw the sensor into the tube.
  • Page 17 Open the ball valve, check for leaks, and manually insert the sensor into the process. Position the sensor at least 1/2 in. (13 mm) away from any wall of the vessel or pipe. Tighten the collet nut. Rosemount 228 Sensor...

  • Page 18: Mechanical Retraction Assembly (Pn 23311-00)

    Install Retracting the Manual Retraction Assembly Prerequisites Make certain that the system pressure is less than 35 psig (342 kPa [abs]). Procedure Push in on the sensor using the top of the junction box. Slowly loosen the collet nut. WARNING! HIGH PRESSURE Reduce pressure to 0 psig.
  • Page 19 Install Figure 2-7. Figure 2-7: Mechanical retraction assembly Terminate the sensor wiring in the junction box. Figure 2-6 for wiring details. Connect the other end of the cable to the transmitter. Rosemount 228 Sensor...
  • Page 20 Install See the wiring diagrams in Figure 3-2, Figure 3-3, and Figure 3-4. For cable PN 23294-00, follow the wiring for the 228-54 sensor. For cable PN 23294-05, follow the wiring for the 228-56 sensor with the following exception: Refer to the wire function diagram for the 228-56 option in Figure 3-1 and identify the RTD wire bundle.

  • Page 21: Replacing Seals In Manual And Mechanical Retraction Assemblies

    For manual retraction assemblies, pull down the nut guard and remove the collet nut from the bushing housing. Slide all hardware, including the bushing housing, off the sensor tube. Remove the retaining ring from the bottom of the bushing housing. Remove the Teflon guard. Rosemount 228 Sensor...
  • Page 22 Install From the top of the bushing housing, press out the Teflon bushing. This will also push out the Teflon cup seal. Replace all damaged parts with replacement parts from Figure 2-8 Figure 2-9. Replace the sensor tube if the surface is damaged. A rough or uneven surface will prevent the Teflon cup from sealing.
  • Page 23 For mechanical retraction assemblies, slide the 3 in. hex union nut, retraction stop collar, junction box compression nut, and plastic ferrules onto the sensor tube. Connect the junction box to the sensor tube and wire the sensor leads to the appropriate terminals. Rosemount 228 Sensor...
  • Page 24 Install For mechanical retraction assemblies, lock the retraction stop collar into position. Figure 2-8 or previously marked position for proper location. Place the union nut O-ring at the bottom of the bushing housing. Insert the sensor assembly into the retraction chamber and tighten the 3 in. hex union nut. For mechanical retraction assemblies, install the nut housing cap.

  • Page 25: Chapter 3 Wiring

    Keep sensor wiring away from ac conductors and high current demanding equipment. Do not cut the cable. NOTICE For additional wiring information on this product, please refer to the Liquid Transmitter Wiring Diagrams. Figure 3-1: Wire functions Rosemount 228 Sensor...
  • Page 26 Wiring Figure 3-2: Wiring diagram for Rosemount 1056 and 56 Transmitters Reference Manual...
  • Page 27 Wiring Figure 3-3: Wiring diagram for Rosemount 1066 Transmitters Figure 3-4: Wiring diagram for Rosemount 5081 Transmitters Rosemount 228 Sensor...
  • Page 28 Wiring Figure 3-5: Wiring sensors through a remote junction box Wire sensors point to point. For wiring at the transmitter end, refer to the appropriate transmitter wiring diagram. For interconnecting cable 23294-00, use the 228-54 wiring diagram. For interconnecting cable 23294-04 and 23294-05, use the 228-54 wiring diagram.

  • Page 29: Chapter 4 Calibration

    Calibration Sensor calibration The nominal cell constant of the Rosemount 228 sensor is 2.7/cm. The error in cell constant is about ±10%, so conductivity readings made the using the nominal cell constant will have an error of at least ±10%. Wall effects,as shown in...
  • Page 30 Calibration If wall effects are absent in the process installation, use a sufficiently large container for calibration to ensure that wall effects are absent. To check for wall effects, fill the container with solution and place the sensor in the center, submerged at least 3/4 of the way up the stem.

  • Page 31: Calibrating Against A Referee - In-Process

    Orient the referee sensor so that the air bubbles always have an easy escape path and cannot get trapped. Tap and hold the flow cell in different positions to allow bubbles to escape. Wait for readings to stabilize before starting the calibration. Rosemount 228 Sensor...

  • Page 32: Calibrating Against A Referee - Grab Sample

    Calibration Adjust the process sensor to match the conductivity measured by the referee instrument. Figure 4-4 shows the arrangement. Figure 4-4: Calibration with a referee instrument example Calibrating against a Referee - Grab Sample This method is useful when calibration against a standard is impractical or when in-process calibration is not feasible, because the sample is hot, corrosive, or dirty, making handling the waste stream from the referee sensor difficult.
  • Page 33 ±0.5 °C. Place the sensors in the grab sample. Wait until the readings are stable before starting the calibration. Adjust the reading from the process analyzer to match the conductivity measured by the referee sensor. Rosemount 228 Sensor...
  • Page 34 Calibration Reference Manual...

  • Page 35: Maintaining And Troubleshooting

    Resistance 103.9 Ω 10 °C (50 °F) 20 °C (68 °F) 107.8 Ω 25 °C (77 °F) 109.7 Ω 111.7 Ω 30 °C (86 °F) 40 °C (104 °F) 115.5 Ω 50 °C (122 °F) 119.4 Ω Rosemount 228 Sensor...
  • Page 36 Maintaining and Troubleshooting Reference Manual...

  • Page 37: Chapter 6 Accessories

    Mounting adapter, Foxboro, Tefzel, 5/8 11 UNC 33075-00 Viton gasket for option 20 33075-03 Kalrez gasket for option 20 9200276 Interconnecting extension cable, shielded, unprepped 9340065 1-1/2 in. FNPT full port ball valve for use with retraction assemblies Rosemount 228 Sensor...
  • Page 38 Accessories Reference Manual...

  • Page 39: Return Of Materials

    Return of Materials Return of Materials For repair and warranty inquiries, please contact Rosemount Customer Care to obtain a Return Material Authorization (RMA) number. Drain the sensor of fluids before shipping it back to Rosemount. Rosemount 228 Sensor...
  • Page 40 Return of Materials Reference Manual...
  • Page 41 Return of Materials Rosemount 228 Sensor...
  • Page 42 Return of Materials Reference Manual...
  • Page 43 Return of Materials Rosemount 228 Sensor...
  • Page 44 2018 Emerson. All rights reserved. youtube.com/RosemountMeasurement The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount is a google.com/+RosemountMeasurement mark of one of the Emerson family of companies. All other marks are the property of their AnalyticExpert.com respective owners.

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