The OFI Testing Equipment (OFITE) Hand Crank Rheometer is a direct-indicating, manually-operated, rotational viscometer. It is powered by a hand crank, which drives the spindle through a precision gear train. The shift cam selects between fixed speeds of 300 and 600 RPM. A knob on the hub of the shift cam determines gel strength.
During operation, fluid is contained in the annular space between two concentric cylinders. The outer cylinder, or rotor, is driven by the hand crank. The inner cylinder, or bob, is restrained by a torsion spring. A dial attached to the torsion spring indicates bob displacement due to friction.
The instrument constants have been adjusted so that plastic viscosity and yield point can be calculated using the 300 and 600 RPM readings.
Size: 9″ × 4″ × 6.5″ (23 × 10 × 17 cm)
Weight: 8 lb (3.6 kg)