--- title: Cambridge Viscosity | Portable 321 Sensor description: Cambridge Viscosity’s Portable Viscometer 321 sensor is designed to be installed in a tank for continuous, accurate temperature and viscosity tracking. --- [![CVI-by-PAC-RGB](https://www.cambridgeviscosity.com/hs-fs/hubfs/CVI-by-PAC-RGB.png?width=1320&height=291&name=CVI-by-PAC-RGB.png "CVI-by-PAC-RGB")](https://www.cambridgeviscosity.com) This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. # Portable Viscometer 321 Sensor ## A unique viscometer for in-tank blending and reaction monitoring ## Cambridge Viscosity’s Portable 321 Viscometer is designed to be installed in a tank for continuous temperature and viscosity tracking. ![Viscosity Range Icon](https://www.cambridgeviscosity.com/hubfs/icon%20green-drops.png "Viscosity Range Icon") Viscosity Range: 0.2 to 20,000 centipoise (cP) ![Repeatability Icon](https://www.cambridgeviscosity.com/hubfs/icons/icon%20green%20double%20arrow.png "Repeatability Icon") Repeatability: 0.5% ![Accuracy Icon](https://www.cambridgeviscosity.com/hubfs/icons/icon%20green-accurate.png "Accuracy Icon") Accuracy: ± 1.0% ![Maximum Temperature Icon](https://www.cambridgeviscosity.com/hubfs/icons/icon%20green%20thermometer.png "Maximum Temperature Icon") Maximum Temperature: 190°C (370°F) ![Pressure Range Icon](https://www.cambridgeviscosity.com/hubfs/icons/icon%20green%20high%20pressure.png "Pressure Range Icon") Pressure Range: 1,000 psi (70.3 bar) ![Wetted Parts Icon](https://www.cambridgeviscosity.com/hubfs/200x200-oil-analysis-1.png "Wetted Parts Icon") Wetted Parts: 316L or Hastelloy [ Talk to an Industry Expert About Your Requirements ](https://www.cambridgeviscosity.com/contact-human-viscometer-inquiries) ![321 Sensor- Image (HR)](https://www.cambridgeviscosity.com/hubfs/White%20background%20sensors/321%20Sensor-%20Image%20(HR)%20.jpeg "321 Sensor- Image (HR)") ### How a Viscometer Sensor Works ### Tell The Reader More - Bullets are great - For spelling out [benefits](https://www.cambridgeviscosity.com/portable-viscometer-321#) and - Turning visitors into leads. ### Cambridge Viscosity's Portable 321 Viscometer Sensor Provides In-Tank Monitoring of Viscosity and Temperature   | **Specifications** |   | | --- | --- | | Viscosity |  0.2 to 20,000 centipoise (cP) | | Piston Ranges |  0.2-2cP, 0.25-5cP, 0.5-10cP, 1-20cP,    2.5-50cP, 5-100cP, 10-200cP, 25-500cP,   50-1,000cP, 100-2,000cP, 250-5,000cP,  500-10,000cP, 1,000-20,000cP | | Viscosity Accuracy* |  ± 1.0%  | | Repeatability |  ± 0.5% of Reading | | Temperature Sensor |  4 wire internal RTD | | Wetted Materials |  316L or Hastelloy | | Maximum Particle Size |  25-360 microns (Range Dependent) | | Max Ambient Temperature |  375°F (190°C) | | Max Operating Pressure |  1,000 psi (70.3 bar) | | Standard Cable Length |  15 feet (4.5 meters) | | Power |  Requires VISCOpro electronics | ### Approvals/Certifications: - TIIS Approved IIBT3 #TC15402 - Approved for Class 1, Div. 1, Group C & D - Approved for EEx d IIC T2, -20C