Call us: (732) 777-2040 | Fax: (732) 777-4828 | E-mail: info@lawlercorp.com

PRECISION PETROLEUM TESTING INSTRUMENTS

Low-Temperature Viscosity of Lubricants Measured by Brookfield Viscometer – ASTM D2983 | ISO 9262 | IP 267 | DIN 51 398

 

Liquid Bath

The use of programmable liquid baths for ASTM D2983 has been allowed since the first development of the test if the cooling profile meets the specifications of Annex A2 of the method.

The Lawler liquid baths are programmed such that the sample cooling rate equals the cooling rate experienced by a sample when immersed in the constant low temperature air chamber. The bath can also be programmed to cool at a rate of 1°C per minute from ambient to as low as -55°C as per CEC-L-18A, ISO 9262, and IP 267 for the measurement of European low temperature Brookfield viscosity.

Operating temperature range of the programmable liquid baths is +20° to -55°C. Temperature control is within ±0.1°C. Windows based PC proprietary software is capable of controlling two baths simultaneously. This allows operating baths at two independent temperatures with independent start, stop, and duration times.

The bath is an unsilvered Dewar jar holding about 3 liters of bath medium. The illuminated jar allows full visibility of the test samples to facilitate the proper position of the spindle bead immersion level.

The turntable holds 10 test samples. After the 16 hours conditioning time, the turntable is manually rotated until the proper test cell is under the viscometer. The spindle is connected while the sample is still in the liquid bath. This allows the measurement of viscosity without removing the sample from the temperature controlled environment. Far superior viscosity data repeatability is obtained using this procedure as opposed to the air chamber procedure.

Duplicate samples at -40°C were measured in a Model 76 Liquid Programmable Bath. Of the 56 samples, the average variability between the duplicate samples was ±1.13% of mean. This compares very favorably to the method’s stated precision of 11.8%. The key factor in this improved precision is the superior temperature control of the sample as its viscosity is being measured.

Model LB-76 Programmable Liquid Bath is a bench top model has a single bath with 10 sample capacity. A Windows based PC is required (not supplied). The bath is supplied with an integral leveling viscometer support rod.

 

 

Air Bath

Five models are available conforming to ASTM D2983 Test Method for Low Temperature Viscosity of Automotive Fluids Measured by Brookfield Viscometer. Each model is equipped with turntable rotating at 4 RPM. Ample storage is provided inside the cold chambers for pre- cooling the insulated cell carriers. A digital, indicating controller with resolution of 0.1°C, maintains set temperature to ±0.1°C.

Model BV-70 has an 28 cm (11 inch) square, multipane, insulated window with fluorescent light for observation of the interior, with 28 sample capacity. A video chart recorder (option -V) to track possible temperature upsets, and a digital sample temperature display (option -D) are available for Model BV-70.

Model BV-40 is a smaller, floor space saving, compact unit, with 12 sample capacity. No viewing window, but with digital sample temperature display.

Model BV-20 is a compact, bench top unit with 6 sample capacity with digital sample temperature display. It is designed for those laboratories with a very light sample load and limited space and budget.

  • Conforms to ASTM D2983, ISO 9262, IP267, DIN 51 398
  • Temperature stability of ±0.1º C
  • Lowest temperature of -60º C
  • Models with dual temperature, independent chambers
  • Capacity from 6 to 28 samples

Liquid Bath Models

Model Number Number of Baths Sample Capacity Lowest Temperature Cabinet Dimensions
LB-76 1 10 -55ºC 23x24x27 in
(58x61x69 cm)

Air Bath Models

Model Number Number of Baths Sample Capacity Lowest Temperature Cabinet Dimensions
BV-20 1 6 -50ºC 38x27x26 in
(95x68x65 cm)
BV-40 1 12 -50ºC 28x36x43 in
(71x91x109 cm)
BV-70 1 28 -60ºC 37x33x46 in
(83x94x117 cm)
Part Number Description
LM-PC Lawler supplied computer configured with software.
KVS-1 Floor stand for Model LB-76
92-10 Dry block bath for sample preconditioning, 10 test positions, optional
92-20 Dry block bath for sample preconditioning, 20 test positions, optional
XDV2TLV Brookfield digital viscometer and DV configuration software
ISO-LVDV Re-certification of existing Brookfield viscometer
LB-VR Viscometer clamp assembly (included with visc. purchased from Lawler)
#4B2 Insulated viscometer spindle, each
LB-F Test cells, per dozen. (Do not use air chamber test jars)
LB-Z Test cell stopper, each
LB-K Test cell cover, each
N27B Reference Fluid, pint -40°C to -18°C (37,000 cP @ -40°C)
N115B Reference Fluid, pint -29°C to – 7°C (12,000 cP @ -12°C)
N14B Reference Fluid, pint 17,000 cP @ -40°C
N60B Reference Fluid, pint 150,000 cP @ -55°C
N120B Reference Fluid, pint 150,000 cP @ -40°C
N480B Reference Fluid, pint 150,000 cP @ -26°C
N1400B Reference Fluid, pint 150,000 cP @ -12°C
LB76-Kit Recommended Accessories for LB76 or LB76-G. Includes:

  • (2) LB-F
  • (10) LB-Z
  • (14) #4B2
  • (10) LB-K
  • (1) LM-PC

Note: The LB76-Kit does not include the Brookfield Viscometer, which can be purchased separately. At least two reference fluids are recommended for each desired test temperature per viscosity.

Part Number Description
92-10 Block Bath for sample preconditioning, 10 test positions
92-20 Block Bath for sample preconditioning, 20 test positions
XDV2TLV-ST Brookfield digital viscometer and DV Loader configuration software (Includes viscometer stand)
ISO-LVDV Re-certification of your existing Brookfield viscometer
#4B2 Insulated viscometer spindle, each
BV-T Test cells, per dozen
BV-S Cell stopper, each
BV-C Cell carrier, each
DAQ-BV Digital data acquisition module for recording of sample and chamber temperature
N27B Reference Fluid, pint -40°C to -18°C (37,000 cP @ -40°C)
N115B Reference Fluid, pint -29°C to – 7°C (12,000 cP @ -12°C)
N14B Reference Fluid, pint 17,000 cP @ -40°C
N60B Reference Fluid, pint 150,000 cP @ -55°C
N120B Reference Fluid, pint 150,000 cP @ -40°C
N480B Reference Fluid, pint 150,000 cP @ -26°C
N1400B Reference Fluid, pint 150,000 cP @ -12°C
BV70-Kit Recommended accessories for BV70. Includes:

  • (4) BV-T
  • (28) BV-S
  • (36) #4B2
  • (10) BV-C
BV40-Kit Recommended accessories for BV40 or BV40-2. Includes:

  • (2) BV-T
  • (12) BV-S
  • (16) #4B2
  • (6) BV-C
BV20-Kit Recommended accessories for BV20. Includes:

  • (1) BV-T
  • (6) BV-S
  • (10) #4B2
  • (4) BV-C

Note: Kits do not include the Brookfield Viscometer, which can be purchased separately. Recommended are at least 2 reference fluids for each desired test temp./visc.

Top