The Rosemount Model 400 /400VP Endurance Conductivity Sensor are designed for direct screw-in insertion into process piping using a 3/4-inch MNPT fitting. The Model 400 sensors can also be used in sidestream samples. A 1-inch pipe tee with a 3/4-inch bushing is a suitable flow cell. A 3/4-inch pipe tee can be used with 0.1 and 1.0/cm cells. A transparent plastic flow cell is also available (PN 24091-02).

ENDURANCE sensors are contacting conductivity 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. Consult the analyzer Product Data Sheet for recommended ranges and accuracy.

Sensors with 0.01, 0.1 and 1.0/cm cell constants have concentric titanium electrodes separated by a PEEK insulator. Viton O-rings seal the internal parts of the sensor from the process liquid. Sensors with 10/cm cell constants have graphite electrodes and an epoxy body.

Electrolytic conductivity is a strong function of temperature, and conductivity readings are typically converted to the value at a reference temperature. To measure temperature, ENDURANCE sensors use a platinum RTD. In metal electrode sensors the RTD is inside the inner electrode. In the epoxy body sensor, the RTD is in a titanium thermowell protruding from the end of the sensor.

The Model 400 sensor is available with Variopol 6 quick disconnect watertight connectors. Wire the interconnecting cable to the analyzer and run the cable to the sensor; the sensor plugs directly into the cable receptacle. To replace the sensor, simply disconnect the Variopol fitting and plug in a new sensor, with no need to rewire or rerun cable.

Features

• Process connection: 3/4 inch MNPT
• Operating temperature: 32 to 221°F (0 to 105°C)
• Operating temperature (option -60): 32 to 392°F (0 to 200°C)
• Maximum pressure: 250 psig (1825 kPa abs)
• Vacuum rating: 7.4 psia (51 kPa abs)
• Cable length options:
  • 10ft cable standard
  • 50ft cable optional
• Wetted materials:
  • Electrodes: titanium
  • Body: 316 stainless steel
  • Insulator: PEEK
  • O-rings: Viton