Kinematic Viscosity Baths — Precision Bath Systems for ASTM D445, D2170 & D2162 Viscosity Testing
KB Scientific Instruments supplies the complete Tamson kinematic viscosity bath line, covering ambient-to-230°C capillary viscometer testing, sub-ambient aviation fuel testing, bitumen and asphalt viscosity determination, and master viscometer calibration. Every bath in the line delivers 0.01°C class temperature stability with full ASTM traceability. Identify the test method, temperature range, and sample type below to select the correct configuration for the laboratory.
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Precision Temperature Baths for Every Viscosity Test Method
Petroleum distillates, fuels, and lubricants are characterised partly by what they contain and partly by how they look. Color and appearance are direct quality indicators — pale, bright petroleum distillates command premium pricing and specification compliance; off-color products raise quality flags. Moisture is a contamination risk — water in petroleum products, chemicals, and process streams causes corrosion, phase separation, filter plugging, and catalyst poisoning. Both properties are measured routinely in petroleum QC labs, and both require purpose-built instrumentation to measure them accurately and repeatably.
The line divides into four functional groups. Standard baths such as the TV2000, TV4000, and TV7000 cover general-purpose kinematic viscosity testing from ambient temperature up to 230°C. Low-temperature baths such as the TV7000LT and TV12LT extend testing down to as low as -50°C for aviation fuel and cold-climate fuel work. Bitumen-configured baths support ASTM D2170 testing of liquid asphalts and road oils, and the TV16000 provides primary calibration of master viscometers and viscosity oil standards under ASTM D2162.
Refineries, independent testing laboratories, lubricant manufacturers, aviation fuel testing facilities, and calibration houses across the Midwest rely on this bath line for repeatable, traceable viscosity results. KB Scientific Instruments configures each bath with the correct cover, viscometer holders, and accessories for the specific test method a laboratory runs, so the instrument arrives ready to commission rather than requiring guesswork on compatible parts.
Built for Repeatable, Traceable Viscosity Results
Ultra-Precise Temperature Control
Every bath in the line achieves 0.01°C class temperature stability using a vane-type stirrer with baffle plates that directs freshly heated or cooled fluid evenly past the viscometer positions and window areas. This design eliminates the localized hot and cold spots that create measurement drift in less sophisticated baths. The TV16000 master calibration bath tightens this further, holding stability better than 0.005°C for primary reference work.
Sub-Ambient and Cryogenic Testing
The TV12LT and TV7000LT models include integrated cooling systems that reach temperatures as low as -50°C without an external chiller. This capability supports ASTM D7566 aviation turbine fuel testing at -20°C and -40°C, along with cold-climate diesel and jet fuel viscosity work. Cooldown from ambient to -20°C completes within approximately 60 minutes on the TV12LT.
Full ASTM Method Compliance
The bath line conforms to ASTM D445, D2170, D2162, D2167, D446, and D7566, along with IP 71 and ISO 3104. Each configuration ships with the cover, opening size, and viscometer holder combination the governing method specifies. This alignment removes the compliance risk of adapting a general-purpose bath to a method it was not built for.
Modular Cover and Viscometer Configurations
Bath covers are available in multiple opening counts and diameters, including 51 mm ASTM openings, 60 mm Pinkevitch openings, and mixed configurations for laboratories running more than one viscometer type. Additional openings accommodate a separate thermometer alongside the viscometer for redundant temperature verification. Covers can be reconfigured as a laboratory's test mix changes.
RS232 Digital Communication
All baths in the line include an RS232 interface for direct connection to a data logging system or LIMS. Temperature readings can be displayed in Celsius or Fahrenheit through a menu-selectable setting. This connectivity supports laboratories that must retain digital records for audit or accreditation purposes.
Master Viscometer Calibration Capability
The TV16000 extends the line beyond routine sample testing into primary calibration, supporting ASTM D2162 basic calibration of master viscometers and viscosity oil standards. Its 160-liter bath volume and 0.001°C readout resolution suit laboratories that certify reference viscometers for other facilities. An alternative TV7000DC plus TLC15-5 circulator setup extends this calibration range up to 230°C.
ASTM METHODS
Methods Supported by This Bath Line
Kinematic Viscosity by Glass Capillary Viscometer
This is the primary method covered by the TV2000, TV4000, TV7000, TV7000LT, and TV12LT baths. It determines the kinematic viscosity of transparent and opaque petroleum products by measuring the time required for a fixed volume of sample to flow under gravity through a calibrated glass capillary viscometer at a closely controlled temperature.
Kinematic Viscosity of Asphalts (Bitumen)
This method covers the determination of kinematic viscosity of liquid asphalts, road oils, and distillation residues of liquid asphalts at 60°C, and of asphalt cements at 135°C. The TV2000 and TV4000 baths, fitted with the D2170 cover configuration, support this method using Cannon Fenske Opaque, Zeitfuchs Cross Arm, or BS/IP/RF viscometers.
Primary Calibration of Master Viscometers and Viscosity Oil Standards
This method establishes the calibration constants for master viscometers and reference viscosity oil standards. The TV16000 bath, with 0.001°C readout resolution and stability better than 0.005°C, is purpose-built to support this primary calibration work in laboratories that certify reference materials.
Aviation Turbine Fuel Containing Synthesized Hydrocarbons
This specification requires kinematic viscosity testing of aviation fuels at sub-ambient temperatures, typically -20°C and -40°C. The TV12LT low-temperature bath was specifically engineered for this application, reaching -20°C from ambient within approximately 60 minutes.
Additional Applications — Model 577 (5G)
Choose the Bath Configuration for Your Test Method
The TV2000 is a compact kinematic viscosity bath offering three capillary viscometer positions
With 0.01°C temperature stability from ambient +5°C up to +230°C. A built-in cooling coil enables sub-ambient testing down to +5°C when connected to a circulator. The three viscometer positions conform to ASTM D445.
Three viscometer positions
Built-in cooling coil for sub-ambient operation
RS232 digital communication
Double-pane tempered safety glass windows
Bath volume: 20 L
Range: Ambient +5°C to +230°C
Stability: ±0.01°C
Power: 3100 W
00T0782 (230V, 50-60Hz)
00T0784 (115V, 60Hz)
The TV4000 offers seven capillary viscometer positions
With the same 0.01°C stability and ambient +5°C to +230°C range as the TV2000, suited to laboratories running a higher sample volume. The built-in cooling coil supports sub-ambient testing, and the bath is compatible with the AKV EASY automated viscosity upgrade kit for laboratories moving toward automated determination. Seven positions conform to ASTM D445.
Seven viscometer positions
Built-in cooling coil for sub-ambient operation
RS232 digital communication
Compatible with the AKV EASY automated upgrade kit
Bath volume: 40 L
Range: Ambient +5°C to +230°C
Stability: ±0.01°C
Power: 3100 W
00T0772 (230V, 50-60Hz)
00T0774 (115V, 60Hz)
The TV7000 provides a 70-liter bath volume with a 63 cm bath depth
Suited to tests requiring precise temperature control across a large fluid volume. It shares the same 0.01°C stability and ambient +5°C to +230°C range as the TV2000 and TV4000, scaled up for higher-throughput laboratories or larger viscometer holder arrangements.
Seventy-liter bath volume
Sixty-three centimeter bath depth
Built-in cooling coil for sub-ambient operation
RS232 digital communication
Bath volume: 70 L
Range: Ambient +5°C to +230°C
Stability: ±0.01°C
Power: 3100 W
00T0792 (230V, 50-60Hz)
00T0794 (115V, 60Hz)
The TV7000LT is a 70-liter low-temperature visibility bath
With integrated cooling that lowers the bath temperature to minus 40°C within approximately four hours. Cooling power is staged across four levels, trimming heat removal capacity to the set point and saving up to 50 percent of energy compared to running at full cooling continuously. Heated windows prevent condensation buildup during extended sub-ambient runs.
Integrated cooling to -40°C
Stability better than ±0.02°C over the full range
Heated windows prevent condensation
Drain and LED fluid level indicator
Bath volume: 70 L
Range: -40°C to +100°C
Stability: better than 0.02°C
Power: 3.1 kW
00T0450 (230V, 50Hz)
The TV12LT is a compact 15-liter low-temperature bath
With four viscometer positions and ultra-precise temperature control down to -42°C. It was specially designed for kinematic viscosity determination of aviation fuels at -20°C and -40°C under ASTM D7566, cooling from ambient to -20°C within approximately 60 minutes. This configuration conforms to ASTM D445, IP 71, and ISO 3104.
Four viscometer positions
Integrated cooling to -42°C
Cools to -20°C within 60 minutes
Detachable front window and internal LED light
Bath volume: 15 L
Range: -42°C to +20°C
Stability: standard deviation ±0.004°C
Power: nominal 800 W, maximum 2100 W
00T0410 (230V, 50Hz)
00T0415 (115V, 60Hz)
00T0420 (230V, 60Hz)
TV12LT configuration extends the upper temperature limit to +80°C
While retaining the same -42°C cooling capability and 0.01°C class stability as the standard range unit. It suits laboratories that need both sub-ambient aviation fuel testing and higher-temperature viscosity work from a single bath. This configuration also conforms to ASTM D445, IP 71, and ISO 3104, including ASTM D7566 aviation fuel testing at -40°C.
Four viscometer positions
Extended range to +80°C
Integrated cooling to -42°C
Detachable front window and internal LED light
Bath volume: 15 L
Range: -42°C to +80°C
Stability: standard deviation ±0.004°C
Power: nominal 800 W, maximum 2100 W
00T0425 (230V, 50Hz)
00T0430 (115V, 60Hz)
00T0435 (230V, 60Hz)
The ultra-low temperature TV12LT variant
Is engineered for the coldest sub-ambient viscosity testing requirements in the line, with a rated span down to -50°C. Independent stability testing shows the bath reaching -40°C within approximately 120 minutes when using methanol as the bath medium. Production units on this range carry a variation of plus or minus 2°C.
Used Together: TV12LT baths are typically paired with an E20 digital contact thermometer, Ubbelohde viscometer holders, calibrated Ubbelohde viscometer tubes, and an N2B viscosity reference standard to build a complete aviation fuel viscosity test system.
Four viscometer positions
Ultra-low temperature span to -50°C
Reaches -40°C within approximately 120 minutes
Detachable front window and internal LED light
Bath volume: 15 L
Range: -50°C to +20°C (±2°C production variation)
Stability: standard deviation ±0.004°C
Power: nominal 800 W, maximum 2100 W
00T0470 (230V, 50Hz)
00T0475 (115V, 60Hz)
00T0480 (230V, 60Hz)
This TV2000 configuration is fitted with the D2170 cover
For determining the kinematic viscosity of liquid asphalts, road oils, and distillation residues of liquid asphalts at 60°C, and of asphalt cements at 135°C. The three-position cover accommodates Cannon Fenske Opaque, Zeitfuchs Cross Arm, or BS/IP/RF viscometers. This configuration conforms fully to ASTM D2170 and EN/ISO 12595.
Three-position D2170 cover
Compatible with Cannon Fenske Opaque, Zeitfuchs Cross Arm, and BS/IP/RF viscometers
Built-in cooling coil for sub-ambient operation
RS232 digital communication
Bath volume: 20 L
Range: Ambient +5°C to +230°C
Stability: ±0.01°C
00T0782 (230V, 50-60Hz)
00T0784 (115V, 60Hz)
This TV4000 configuration extends the D2170 bitumen viscosity method
To a seven-position cover for laboratories testing a higher volume of asphalt, road oil, or distillation residue samples. It shares the same 60°C and 135°C test temperatures and viscometer compatibility as the TV2000 D2170 configuration, scaled to a 40-liter bath volume.
Seven-position D2170 cover
Compatible with Cannon Fenske Opaque, Zeitfuchs Cross Arm, and BS/IP/RF viscometers
Built-in cooling coil for sub-ambient operation
RS232 digital communication
Bath volume: 40 L
Range: Ambient +5°C to +230°C
Stability: ±0.01°C
Power: 3100 W
00T0772 (230V, 50-60Hz)
00T0774 (115V, 60Hz)
The TV16000 is a 160-liter ultra-stable bath purpose-built
For primary basic calibration of master viscometers and viscosity oil standards under ASTM D2162. It holds temperature stability better than 0.005°C with a readout resolution of 0.001°C, and it operates across a 10°C to 60°C span on four wheels, two of which include brakes for stable positioning. An alternative TV7000DC plus TLC15-5 circulator setup is available for calibration work up to 230°C.
Ultra-stable, better than ±0.005°C
0.001°C readout resolution
Four wheels, two with brakes
Heated window prevents condensation
Bath volume: 160 L
Range: 10°C to 60°C
Stability: better than 0.005°C
Power: 3 kW
00T0490 (230V, 50Hz)
00T0492 (115V, 60Hz)
00T0495 (230V, 60Hz)
Specifications at a Glance
Range
Range
From ambient-range TV2000 capillary testing to -50°C aviation fuel viscosity work on the TV12LT, this bath line covers ASTM D445 testing across every temperature range a petroleum laboratory runs.
Purpose-built for ASTM D2162 primary calibration of master viscometers and viscosity oil standards, with 0.001°C readout resolution for laboratories that certify reference materials for other facilities.
±0.01°C
Master Calibration Bath — TV16000
160 L
Tamson · CE certified
Who Uses This Bath Line
Petroleum Refining
Refinery quality control laboratories use these baths to verify the kinematic viscosity of crude fractions, finished fuels, and lubricant base stocks against product specifications. The standard TV2000, TV4000, and TV7000 baths cover the ambient-to-230°C range most refinery samples require. Consistent 0.01°C stability supports the repeatability refinery QC programs depend on.
Aviation Fuel Testing
Aviation fuel laboratories rely on the TV12LT to determine kinematic viscosity at the sub-ambient temperatures ASTM D7566 requires for synthesized hydrocarbon jet fuels. The bath reaches -20°C within approximately 60 minutes, keeping sample turnaround practical for production testing schedules. Reference standards and calibrated Ubbelohde viscometers complete the test system.
Asphalt and Bitumen Production
Asphalt terminals and paving material testing laboratories use the D2170-configured TV2000 and TV4000 baths to test liquid asphalts, road oils, and asphalt cements at their specified test temperatures. The D2170 cover and compatible viscometer holders keep sample handling consistent with the governing method. This supports both incoming material verification and finished product certification.
Independent Calibration Laboratories
Laboratories that certify master viscometers and reference viscosity oil standards for other facilities use the TV16000 for ASTM D2162 primary calibration work. Its 0.001°C readout and sub-0.005°C stability meet the precision that primary reference calibration demands. The alternative TV7000DC and TLC15-5 setup extends this calibration capability to higher temperatures.
Lubricant Manufacturing
Lubricant blending and finished product laboratories use the standard bath line to verify viscosity grade against SAE and ISO viscosity grade classifications during production and before shipment. The seven-position TV4000 and 70-liter TV7000 support higher sample throughput in production-scale QC environments. RS232 connectivity allows results to feed directly into a plant LIMS.
Environmental and Marine Fuel Testing
Marine fuel and bunker testing laboratories use these baths to verify viscosity specifications on distillate and residual marine fuels before delivery. The ambient-to-230°C range on the standard baths accommodates the higher viscosity grades common in heavy marine fuel oil testing. Consistent temperature control supports the repeatability required for bunker fuel quality disputes.
Your Authorized Tamson Partner in the Midwest
Three things that set sourcing this bath line through KB Scientific apart from buying direct or through a general lab equipment distributor with no petroleum viscosity testing background.
Authorized Tamson Representative
As an authorized Tamson representative, KB Scientific Instruments maintains a direct line to Tamson engineering and factory support for technical questions, warranty issues, and parts availability. Customers get manufacturer-backed answers without navigating an overseas support channel directly. This relationship also keeps lead times and stock availability current for the Midwest region.
Method-Matched Configuration Guidance
Every inquiry starts with identifying the governing ASTM, IP, or ISO method, the required temperature range, and the viscometer type already in use in the laboratory. KB Scientific then recommends the specific bath, cover, and accessory combination that matches those requirements rather than a generic catalog listing. This reduces the risk of ordering a bath that arrives incompatible with an existing test program.
Local Midwest Support
Being Midwest-based allows KB Scientific to support installation, commissioning, and ongoing calibration assistance without the delays of cross-country or international service scheduling. Laboratories get a local point of contact for troubleshooting and replacement parts. This regional presence shortens the time between an equipment issue and a resolved test program.
Frequently Asked
Questions
What refinery QC analysts, aviation fuel testers, and calibration lab managers ask most often about this bath line.
What is the difference between the TV2000, TV4000, and TV7000 baths?
All three baths share the same 0.01°C temperature stability and ambient +5°C to +230°C operating range, so the difference comes down to bath volume and viscometer position count. The TV2000 holds 20 liters with three positions, the TV4000 holds 40 liters with seven positions, and the TV7000 holds 70 liters with a 63 cm bath depth for larger fluid volumes. Laboratories with lower sample throughput typically choose the TV2000, while higher-volume QC or production testing environments favor the TV4000 or TV7000. All three accept the same style of RS232 connectivity and cooling coil options.
Can the TV12LT test aviation fuel viscosity at sub-zero temperatures?
Yes, the TV12LT was specifically designed for kinematic viscosity determination of aviation fuels under ASTM D7566, which requires testing at -20°C and -40°C. The standard -42°C to +20°C configuration and the extended -42°C to +80°C configuration both cool to -20°C from ambient within approximately 60 minutes. An ultra-low temperature variant is also available with a rated span down to -50°C for the coldest test requirements. A suggested accessory set including an E20 digital thermometer and calibrated Ubbelohde viscometers completes the aviation fuel test setup.
Which bath is needed for ASTM D2170 bitumen viscosity testing?
ASTM D2170 testing uses the TV2000 or TV4000 bath fitted with the D2170-specific cover configuration, which accommodates Cannon Fenske Opaque, Zeitfuchs Cross Arm, or BS/IP/RF viscometers. The method requires testing liquid asphalts and road oils at 60°C and asphalt cements at 135°C, both of which fall within the standard ambient-to-230°C range these baths cover. The choice between the TV2000 and TV4000 configuration depends on how many samples the laboratory runs concurrently. Both configurations conform fully to ASTM D2170 and EN/ISO 12595.
What does the TV16000 do that the standard baths cannot?
The TV16000 is purpose-built for ASTM D2162 primary calibration of master viscometers and viscosity oil standards, a task that demands tighter stability than routine sample testing requires. It holds temperature stability better than 0.005°C with a 0.001°C readout resolution, compared with the 0.01°C stability of the standard TV2000, TV4000, and TV7000 baths. Its 160-liter bath volume and mobile wheeled base also differ from the benchtop standard baths. Laboratories that certify reference viscometers for other facilities rely specifically on this level of precision.
Do these baths require external cooling equipment?
It depends on the model and the target temperature. The TV7000LT and TV12LT include integrated cooling systems that reach sub-ambient and sub-zero temperatures without an external chiller. The standard TV2000, TV4000, and TV7000 baths include a built-in cooling coil, but reaching temperatures below ambient plus 5°C on these models requires pumping cooling fluid through that coil using tap water or an external circulator such as the TLC10 or TLC15. KB Scientific can recommend the correct circulator pairing based on the target temperature and bath model.
Can existing manual Tamson baths be upgraded to automated viscosity determination?
Yes, the AKV EASY upgrade kit converts manual Tamson baths, including the TV4000MKII, TV4000DC, TV2000MKII, and compatible OEM baths, into a system with automated kinematic viscosity determination. The TV2000MKII accepts a single-channel AKV EASY system, while the TV4000MKII, TV4000DC, and OEM baths can run either a single or dual-channel configuration. The upgrade kit measures kinematic viscosity of oils and other Newtonian liquids from 0.3 up to 10,000 mm2/s using Ubbelohde viscometers, complying with ASTM D445, IP 71, and ISO 3104. Changing viscometers on an AKV EASY-equipped bath takes less than a minute, though filling and cleaning remain manual steps.
Other Instruments You May Need
Confirm the Right Configuration for
Your Test Method
Request a Quote or Technical Consultation
With ten bath configurations spanning four ASTM method families, the fastest path to the correct instrument is a short conversation about the test method, sample type, and temperature range already in use in the laboratory. KB Scientific Instruments will confirm the matching bath, cover, and viscometer combination and provide a formal quote covering the complete configuration.