Rosemount Analytical Model 228 Conductivity Sensor
Starting at $921.00

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  • Rugged construction
  • Max Temp;
    • PEEK: 120°C (248°F)
    • PEEK: 200°C (392°F)
    • Tefzel: 120°C (248°F)
  • Max Pressure;
    • PEEK: 295 psig
    • Tefzel: 200 psig
  • Tolerates high vibration
  • Max cable length: 200ft
  • Integral RTD

The Model 228 is a submersion-insertion type toroidal sensor. Because it measures conductivity by inducing a current, the toroids do not need to touch the sample, but can be encased in plastic. Thus, unlike metal electrode sensors, the Model 228 sensor can be used in corrosive and dirty samples. It is also ideal for measuring high conductivity liquids.

The sensor is available in glass-filled PEEK and in filled and unfilled Tefzel®. The temperature limit is 248ºF (120ºC); although a high temperature (392ºF (200ºC)) PEEK version is available. The pressure limit for PEEK body sensors is 295 psig (2135 kPa abs) and for Tefzel body sensors is 200 psig (1480 kPa abs).

Mechanical and manual retraction assemblies that allows the sensor to be removed from the process piping without shutting down the process and draining the line is also available.


Rosemount Analytical 23294-00 Extension Cable
Unshielded interconnecting cable for 1054A, 1054B & 2054C
Rosemount Analytical 23294-05 Extension Cable
Shielded interconnecting cable with additional wire
Rosemount Analytical Extension Cable
Extension cable for Model 228

Mounting Bracket

Rosemount Analytical Mounting Adapter
Mounting adapter with 2in insert, CPVC & 1in FNPT conduit connection


Please consider these optional accessories.

Rosemount Analytical Mounting Adapter
1 x 3/4in, 1.5in insertion
Rosemount Analytical Adapter Insert
PEEK, 1 X 3/4in, for 23242-02
Rosemount Analytical 23550-00 Junction Box Remote
Rosemount Analytical 23242-03 Mounting Adapter
1.5in insert, 1in conduit connection
Rosemount Analytical 33075-03 Gasket
Rosemount Analytical O-ring
Rosemount Analytical Ball Valve
Ball valve, full port, 1 1/2 FNPT
Rosemount Analytical Valve Insertion Assembly
Valve insertion assembly with mechanical or manual options
Rosemount Analytical 23277-01 Mounting Adapter
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:

Application Notes

Here's how some of our customers used this product.

Measuring Acid Concentration Via Conductivity

The Background: A manufacturing company uses a very strong acid as part of its manufacturing process and needs to monitor the strength of the acid

The Problem: Typical pH probes are generally designed for measuring between 2 and 12 pH. Outside of that range, accuracy is greatly diminished. To account for this, it is common to measure the concentration of the acid or base with a conductivity meter rather than measuring the pH level. One problem with this is that standard contacting conductivity probes are likely unable to handle the corrosive nature of strong acid and bases.

The Solution: The Rosemount 228 is a toroidal conductivity sensor that measures conductivity by inducing a current, a technology that does not require contact with the sample making it ideal for highly corrosive environments. The 228 will provide accurate conductivity readings as a way to determine the concentration of an acid or base.

Part Number Price Available
Show Configuration
Base Price
Materials of Construction
PEEK, Standard Temperature to 120°C (248°F)
Process Connection
3/4" MPT Threads
Cable Type
Shielded cable for improved EMI/RFI protection
Cable Length
20' (6.1 m)
$921.00 3

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