TBR    Tannas Basic Rotary Viscometer
A low-shear (1-200 reciprocal seconds) rotational viscometer that measures true viscosity (dynamic) not a combined viscosity-density value (kinematic). This is very important when distinguishing the viscous properties of synthetic and mineral oils or when comparing water-based and oil-based lubricants. For automotive applications the TBR has been found particularly useful in measuring the viscosity of sooted diesel engine oils. Autosampler available. Principle: - High temperature, low shear rate rotational (absolute) viscometry.
Special Features: - Sample measurement time as quick as 5 minutes, depending on sample type. - Incorporates the Chase-flush technique for sample injection. - Excellent for measuring viscosities of 'used' and 'heavily sooted' oils. - AutoSampler Delivery System also available.
Tech. parameters
Dimensions: - Viscometer: ~ 32 lbs. (10" x 10" x 16") or (25 x 25 x 41 cm) - Console Box: ~7 lbs. (8.5" x 13" x 5.5") or (22 x 33 x 14 cm) Operating Temperatures: - Ambient to over 200C (0.1C) - Sub-ambient temperature operating information upon request. Shear Rate Capabilities: - Maintains constant shear rate from 1 to over 200 reciprocal seconds (sec-1), depending on speed setting and rotor size. Read-out: - Continuous viscosity reading directly into centiPoise (cP). Sample Volume: - Fifty (50) mL sample size is recommended. Viscosity Range: - The TBR is capable of analyzing fluids with viscosities ranging from 1 to 35,000 cP with the current Rotor design. For measuring higher viscosities, a different size Rotor may be required. This can be investigated on a project basis. The desired operating temperatures would be required for such a project to commence. - When measuring oils with viscosities too high to manually (hand) inject into the TBR via the syringe, a Pump Controller is required. Accuracy & Repeatability: - TLS-I Viscometer - Specially modified Brookfield Viscometer with traditional Brookfield torque accuracy: 0.1, reproducibility: 0.2%. - A repeatability study conducted with 10 back-to-back analyses on the TBR resulted in a Relative Standard Deviation of 0.083% with repeatability at 0.23%. Voltage: - 120 VAC, 50/60 Hz (Also available in 220 VAC) Safety: - Over-temperature Cut-out Fuse - CE Marked