GT-ASTM

Supported Applications

The Omega GT-ASTM series comprises ASTM Like Quality Control Liquid in Glass Thermometers designed for laboratory environments. These individually serialized instruments approximate ASTM requirements and are intended for use in quality control laboratories or facilities where ISO 9000 standards apply.

Operating Conditions & Performance

The GT-ASTM series covers a broad envelope of temperature ranges, immersion depths, and accuracy classes tailored to specific test methods. Measurement spans from -80°C (-112°F) up to 350°F (depending on the model), with accuracies ranging as tight as ±0.2°C or ±0.5°F for specialized applications like Wax Melting Point and Low Softening Point tests, to wider tolerances such as ±4°F for Fuel Rating Orifice Tank models.

Performance specifications are method-dependent:

• Precision General Purpose (ASTM 62/63): Accuracy of 0.3°C or 0.6°F with total immersion.
• Fuel Rating and Flash Point Tests: Models for Pensky-Martens Low, Tag Closed Tester, and Vegetable Oil Flash offer accuracies between 1°C (2°F) and 3°F above specific thresholds.
• Solidification and Freezing Points: Weathering Test and Aviation Fuel Freezing Point models provide accuracy down to ±0.4°C or ±0.5°F, with some ranges specifying tighter tolerances below -20°C (-10°F).

Configuration Options

The series is configured by ASTM method number, temperature range scale (Celsius or Fahrenheit), and specific test application. All models feature a White Back design for enhanced readability.

• ASTM Methods Supported: Cloud and Pour, Low Cloud and Pour, Pensky-Martens Low, Density-Wide Range, Wax Melting Point, Softening Points (Low/High), Saybolt Viscosity, Reid Vapor Pressure, Aniline Point, Titer Test, Solvents Distillation, Storner Viscosity, Congealing Point, Tag Closed Tester, Tank tests, Fuel Rating variants, Vegetable Oil Flash, Solidification Point, Weathering Test, Bituminous Softening Point, and Aviation Fuel Freezing Point.
• Immersion Types: Configurations include Partial Immersion (typically 76 mm / 3" or similar), Total Immersion, and specific depths such as 50 mm (2") for Low Aniline Point tests.
• Scales and Divisions: Graduations range from 0.1°C/°F to 2°F depending on the model's intended resolution.

Model Numbering

The series follows the pattern GT-<MODEL_NUMBER>, where the suffix identifies the specific ASTM method and scale (e.g., GT-100011 for a 1°C range, GT-100092 for Pensky-Martens Low in Fahrenheit).

Physical Dimensions

Overall lengths vary by application, ranging from compact 162 mm (6.4") units for Fuel Rating and Butadiene tests to extended 420 mm (16.5") stems required for Density-Wide Range measurements.

Key Product Differences

Variants within the GT-ASTM series are distinguished primarily by their ASTM method designation, which dictates the temperature range, scale divisions, immersion depth, and accuracy class. The catalog includes paired Celsius (°C) and Fahrenheit (°F) models for most test methods.

• Scale Type: Models are available in either metric or imperial scales; a single model number corresponds to one specific unit system.
• Accuracy Tiers: High-precision applications such as Wax Melting Point (ASTM 14) and Low Softening Point (ASTM 15) utilize finer divisions (0.1°C/°F or 0.2°F) compared to general fuel rating models which may use 1°C or 2°F divisions.
• Immersion Requirements: Some methods require total immersion of the liquid column, while others specify partial immersion depths such as 76 mm (3") for standard ASTM No. 1 and 5 tests.