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| Rheometer Model 280 Hand-Powered |
|
Requires very little field maintenance, and is the lightest field instrument available for determining plastic viscosity and yield point
The Model 280 is a hand-powered, two-speed rotational Rheometer designed specifically for field testing the rheological properties of drilling fluids. A small crank drives the rotor at a pre-selected constant speed through a precision gear train governor. Rotor speeds of 300 or 600 are obtained by setting the position of the speed control lever. Measurements are read directly from the deflection scale. The readings obtained are used to determine the plastic viscosity and yield point of the test fluid.
Gel strength measurements are read directly from the deflection scale. When making gel-strength measurements, force is applied manually by turning the gel knob and observing the maximum reading on the deflection scale before the gel breaks.
The API recommended Torsion Spring, Rotor, and Bob are supplied with the Model 280 Rheometer. A stainless steel sample cup is also included. An optional High Impact plastic carrying case is available.
The Rheometer Cup Heater allows measuring viscosity at elevated temperatures. Heater Cups are fitted with a removable stainless steel sample cup for easy cleaning, and are designed to fit snugly on the Rheometer base. The Thermostat control allows heating up to 200°F (93°C).
| Rheometer Model 50SL High Temperature |
|
Fann coaxial cylinder viscometers are the most widely used of this type in the world
The Model 50SL High-Temperature Rheometer is a rotational viscometer designed for testing fluids at temperatures to 500°F (260°C) and pressures to 1,000 PSIG (7,000kPa) in a coaxial cylinder chamber. Heating, pressurization and rotor speed are controlled by input from specialized software.
The xpRt50™ software is optimized for use with drilling fluids and fracturing fluids, and is designed to allow a single computer to control two Model 50 Viscometers using RS-485 serial communications. Once the sample has been loaded and the heater bath raised for testing, all control of the viscometer is accomplished via the computer and the specialized software.
The torsion springs are designed for ease of interchangeability, which permits the shear stress range of the instrument and, hence, the viscosity measuring range to be optimized for a given testing problem.
Specifications for Model 50 Rheometers
| Power Requirements | 115 Volt 50/60 Hz, 1000 Watts |
|
Motor Drive |
Variable from 3 to 600 RPM Sample Cup Speed |
| Sample Cup/Bob and Sample Heat | Thermo Bath, 600 Watt, Max Temp 500oF (260oC). |
| Sample Cup/Bob Sample Cool | Cold Water Circulation in Thermo Bath |
| Sample Temperature Measurement | Type "J" thermocouple in bottom of Bob shaft |
| Nitrogen Pressurization | Provided from external Nitrogen source controlled by Regulator |
| Bob Shaft Rotation | Controlled by Shear Stress, 15 degrees maximum, Mechanical stops prevent over travel |
| Shear Stress Transducer | Variable transformer sensing the angular position of the Bob and Bob shaft |
| Torsion Springs (Determines Shear Stress Range) | No. 440 (standard), 0.41 Newton/degree |
| Bob (Standard) | B5 1.5987 cm Radius x 7.62 cm long |
| Sample Cups | R1 1.8415 cm inside radius (standard) R2 1.7588 cm inside radius |
| Rheometer Model 286 Variable-Speed Electronic |
|
A precision rotational viscometer designed for conveniently testing the rheological properties of drilling fluids using two modes of operation.
The variable mode allows continuous speed from 3 to 600 rpm, while the second mode offers settings at conventional speeds of 100, 200, 300, 600, and gel strength (3 rpm). Closed loop speed control allows accurate testing of shear thinning fluids because the speed remains locked at the desired speed throughout testing. The rpm readout resolution is 1 rpm on a digital display. The dial indication is read directly through a cover-mounted magnifier.
The Model 286 Rheometer utilizes a universal power supply input and will operate at either 120 VAC, 230 VAC, or 12 VDC. This instrument is not affected by frequency variations.
The API recommended Torsion Spring, Rotor, and Bob are supplied with the Model 286 Rheometer. A stainless steel sample cup and a plastic carrying case are also included.
The Rheometer Cup Heater allows measuring viscosity at elevated temperatures. Heater Cups are fitted with a removable stainless steel sample cup for easy cleaning, and are designed to fit snugly on the Rheometer base. The Thermostat contr
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