Rosemount Analytical Model 242 Flow Toroidal Conductivity Sensor
Starting at $5,236.00

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  • Over 250 configurations
  • Replaceable liner in glass-filled PEEK, Teflon, or Alumina
  • DIN and ANSI flanges compatible with all piping installations
  • Line sizes of 1 through 4 inches (DN 25, 40, 50, 80 and 100)
  • In-line Calibration
  • Temperature sensor and junction-box included

The Rosemount Analytical Model 242 Flow Toroidal Conductivity Sensor is ideal for use in processes where contacting sensors - those with electrodes exposed to the measured solution -- would corrode or become fouled.

The Model 242 Flow Through Toroidal conductivity sensor consists of two toroids surrounding a pipe through which the process liquid flows. One toroid acts as a transmitter and the other as a receiver. Energizing the transmitter toroid induces an electric current in the process solution which induces an electric current in the receiver toroid. The strength of the induced current is directly proportional to the conductivity of the solution.

The Model 242 sensor is available in over two hundred fifty configurations to meet the needs of many applications and installations. Line sizes of 1, 1.5, 2, 3, and 4 inches (25, 40, 50, 80, and 100 mm) are available with both ANSI and DIN compatible flanges. A variety of liner materials and O-rings are available to ensure compatibility with most process liquids.

The Model 242 sensor is easy to install. It fits in the process piping between mounting flanges. Special grounding rings are not needed because the sensor has contact rings built into it. Recessed bolts hold the sensor together to ensure all internal parts stay in perfect alignment. A junction box and a Pt 100 RTD are included. The RTD slips easily into one of the sensor contact rings. There is no need to install a separate thermowell, and temperature measurements are made at the same point as the conductivity measurements.

The Model 242 is not sensitive to flow rate or direction. It does not obstruct the process flow. The sensor is rugged and constructed from chemically resistant materials. All these features make the sensor ideal for applications in mining and metals processing, pulp and paper processing, and the chemical processing industry.

The Model 242 Flow Through Conductivity Sensor is compatible with instrument Models 54eC, 1055, 3081T, 4081T, 5081-T, and Xmt-T.


Rosemount Analytical Extension Cable
Extension cable for Model 228
Rosemount Analytical 23909-00 Extension Cable
Prepped extension cable available in 15, 30, 45 & 60ft lengths, for use with 1055, 1056, 56, 54eC, 5081-T & Xmt-T


Please consider these optional accessories.

Rosemount Analytical Stainless Steel Tag
Rosemount Analytical Kit liner
Kit liners that come in 1", 1 1/2", 2", 3" or 4"
Rosemount Analytical O-Ring Kit
O-rings kits for model 242, 1", 1 1/2", 2", 3", and 4" sizes
Rosemount Analytical TC Kit
TC kit for model 242 flow toroidal conductivity sensor
Rosemount Analytical Pt100 RTD
Pt100 RTD for model 242
Rosemount Analytical 99CC Calibration Certificate
One certificate per lot at standard factory ranges only, includes the model, serial and/or tag numbers (does not include actual test data)
Rosemount Analytical Electronic Calibration
Certificate for specific unit, includes model, serial and/or tag numbers, test standards, NIST report numbers, & the actual test data
Rosemount Analytical Certificate of Origin
Original certificate of origin with chamber of commerce stamp


This product can be used in the following applications: