Test Method
Determines the measurement of the Yield Stress, Apparent Viscosity and Borderline Pumping Temperature ( BPT) of engine oils. Borderline pumping temperature is a measure of the lowest temperature at which an engine oil can be continuously and adequately supplied to the oil pump inlet of an automotive engine. Provides a correlation between the temperature at which the viscosity of engine oils reaches a critical value and the borderline pumping failure temperature in engines at the test method specified shear stress.

K38500 Mini-Rotary Viscometer
• Testing capacity of up to 10 samples.
• Microprocessor temperature controllers store all testing profiles in
memory.
• Unique design is fully self-contained - no external refrigeration or heating
apparatus needed.
• Advanced direct refrigeration technology eliminates the need for liquid cooling mediums such as methanol.
• Removable test cells allow for easy cleaning, sample agitation and advance sample preparation.
• New rotor design eliminates possible interference with water and ice.
• Internal hermetic refrigeration system provides direct instant cooling.
• Power-saver feature allows testing profile to resume in the event of a brief power interruption.
• Internal gas system provides a continuous blanket of dry gas over
samples to eliminate moisture buildup.
• Rotor stator rack supplied for convenient cleaning, drying, and storage.
• Safety features include high pressure cutout and high temperature limits.
• Rotor stator sets included with instrument. Additional sets readily
available.
• Optional Software Package available

Specifications
Conforms to the specifications of:
ASTM D4684; SAE J300; ILSAC GF3-GF4
In accordance with the specifications of:
ASTM D3829, D6821* , D6896
* With available Drive Line equipment sold separately
Cabinet Material: Stainless steel and durable thermoplastic
Temperature Range: + 80° C to -40° C ( 176° F to -40° F)
Bath Design: Solid, direct cooling without liquids
Cooling Rate: Single Unit: 5.0° C per minute maximum
Refrigerant: R-507
Compressor Size: 1/ 3 Horsepower
Electrical Requirements:
115V 50/ 60Hz, 15A
220V 50/ 60Hz, 7A
Temperature Control: + / - 0.1° C, digital readout
Heating Capacity: 600 Watts
Testing Capacity: 10 samples

Included Accessories
Removable Rotor/ Stator Sets ( 10)
Rotor/ Stator Holding Rack
Stator Removal Tool
Moisture Cover
Set of Weights & Strings
Air Filter Dryer and Desiccant

Dimensions lxwxh, in.( cm)
15.5x12.5x13.5 ( 39x32x34)
Net Weight: 105 lbs ( 47.6 kg)

Shipping Information
Shipping Weight: 143 lbs ( 64.86 kg)
Dimensions: 23 x 19 x 27 in ( 58.4 x 48.3 x 68.6 cm)

Ordering Information
Catalog
Number Product Description
K38500 Mini-Rotary Viscometer, 115V 50/ 60Hz
K38590 Mini-Rotary Viscometer, 220V 50/ 60Hz

Accessories
Catalog
Number Product Description
K38500-1 Stator Insertion/ Removal Tool ( SIRT)
K38500-2 Moisture Cover
K38500-3 Rotor/ Stator Set ( 1 Set)

K38500-4 Rotor/ Stator Set ( Set of 10)

K38500-5 Carriage Wheel Assembly

K38500-6 Stainless Steel Thumb Nut

K38500-7 Air Filter Dryer with Desicant

K38500-8 Rotor/ Stator Holding Rack

K38500-9 MRV Weight Set – Standard

K38500-10 N105B Reference Oil ( Pint)

K38500-11 MRV String Set ( Qty 10)

K38500-12 MRV Driveline Rotor ( for D6821)

K38500-13 MRV Weight Set – Driveline ( for D6821)

K38500-14 Desiccant Media – 1 lb.