Rosemount Analytical Model 403 / 403VP Endurance Conductivity Sensor
Starting at $1,006.00

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  • Initial calibration not required
  • 0.01, 0.1 and 1.0/cm cell constants
  • 1-1/2 inch or 2-inch sanitary flange process connection
  • Temperature range: 32 to 221°F (0 to 105°C)
  • Max pressure: 250 psi (1825 kPa abs)
  • All wetted surfaces have 16 micro inch Ra finish
  • Certificate of conformance supplied with each sensor
  • Variopol quick disconnect fitting option

The Rosemount Analytical Model 403 and 403VP Endurance Conductivity Sensors are intended primarily for the determination of electrolytic conductivity in water-for-injection (WFI). The sensors are also used in water purification systems in the food and beverage industry.

ENDURANCE Model 403 and 403VP sensors are contacting sensors. They are available in cell constants of 0.01, 0.1, 1.0, and 10/cm. The choice of cell constant depends on conductivity. High conductivity samples require larger cell constants.

Sensors with 0.01, 0.1, and 1.0/cm cell constants have concentric titanium electrodes separated by a PCTFE (Neoflon®) insulator. Ethylene propylene O-rings seal the internal parts of the sensor from the process liquid. The sanitary flange is 316 stainless steel. All wetted plastics and elastomers are compliant with 21CFR177, and all wetted surfaces have a 16 microinch (0.4 micrometer) Ra finish. The sensor is shipped with a certificate of conformance for materials and surface finish.

Electrolytic conductivity is a strong function of temperature, and conductivity readings are typically converted to the value at a reference temperature. A platinum RTD in the inner electrode measures the temperature.

Sensors with a 10/cm cell constant have side-by-side graphite electrodes and an epoxy body. The RTD is enclosed in a titanium thermowell protruding from the end of the sensor. Graphite electrode sensors are not compliant with 21CFR177, nor do they have a 16 microinch Ra surface finish.

ENDURANCE Model 403 and 403 VP sensors are available with either a 1-1/2 inch or 2-inch TriClamp® sanitary process connection.

Model 403VP has a Variopol 6 (VP) quick disconnect watertight connector. Wire the interconnecting cable to the analyzer and run the cable to the sensor. The sensor plugs into the cable receptacle. To replace the sensor, simply disconnect the Variopol fitting and plug in a new sensor. There is no need to rewire or rerun cable.


Rosemount Analytical 23747-00 Connecting Cable
Connecting cable terminated for Rosemount Analytical sensors
Rosemount Analytical 9-conductor Extension Cable
Rosemount Analytical VP6 Cable
VP6 conductivity, amperometric cable for the Rosemount Analytical 400 series, available in 2.25 to 100ft lengths


Please consider these optional accessories.

Rosemount Analytical 23550-00 Junction Box Remote
Rosemount Analytical 9210004 Conductivity Standard
Conductivity Standard, 2000 µS/cm, 16 oz
Rosemount Analytical 9340078 Ball Valve
Ball valve 1 1/4" full port
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: