iX77® Rheometer

The iX77® Rheometer is a coaxial cylinder type rheometer designed to measure fluid rheologies under high pressures and temperatures with a high degree of safety. The Fann design is based on a machine developed by Sandia National Laboratories. Though designed with oil well and geothermal drilling fluids in mind, the instrument has applications in many other fields.

The iX77® Rheometer operates at temperatures up to 600°F (316°C) and pressures of up to 30,000 psig (206,840 kPa). Operation at below ambient temperatures is possible with an optional chiller controlled by the software. This system uses a unique magnetic sensor to detect the motion of the jewel mounted torsion assembly in the test cell. The sensor system can be calibrated to ± one degree (equivalent to one centipoise at 300 RPM). Test pressures are generated by an air operated high pressure hydraulic pump and controlled by a smart back pressure controller, high pressure valve and pressure transducer. The pressurization fluid fills the upper portion of the test cell. The pressurization fluid is in direct contact with the quiescent sample, above the sample, not in the measurement area. The contact area is small to minimize mixing.

The rheometer’s one-piece bench top design makes it suitable for use on a well site as well as in a laboratory. A strong low profile (22 inch high) bench top is recommended for easier cell removal. For viscosity testing below ambient temperatures Fann offers an optional chiller for the iX77™ Rheometer. The Model D4004 Chiller provides controlled sample cooling and is capable of regulated sample cooling from ambient temperature to -10°C.

Ordering Information

Part No. 101543382 -iX77™ Rheometer

Part No. 204160 Model D4004 Chiller 115/120 Volts

Part No. 381464 Model D4004 Chiller 220/230 Volts


  • Maximum Temperature 600°F (316°C)
  • Minimum  Temperature 23° (-5°C) (with optional chiller Material No. 204160/115V or 381464/230V)
  • Maximum  Pressure: 30,000 (206843 kPa, 2041 atm)
  • Sample Volume: 7.76in3 (175 cm3) (nominal)
  • Power Requirements: 230 Volt, 60/50 Hz, 1 KVA
  • Viscosity Range: 0-300 cP @ 300 rpm
  • Minimum Viscosity: 5 cP @ 600 rpm


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