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Libra-785-Series

Parallel Tube Liquid Bath Libra Model 785

Isotech calibration baths employ sophisticated designs to ensure calibration to the smallest of uncertainties. In 1986 Isotech purchased the interests of H N Irving & Sons Temperature division which had specialised in providing high quality baths to NPL and other international laboratories.

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Parallel Tube Liquid Bath Libra Model 785

Features

  • Uncertainties to <1mK
  • Physical separation of heating from Calibration Volume
Parallel Tube Liquid Bath Libra Model 785

Description

The knowledge and concepts from this scientific instrument manufacturer were used in the development of the Isotech 815 and 915 Parallel Tube Liquid Baths. Whilst there is a higher cost compared to simple designs the quality and pedigree is unmatched.

The key feature is the physical separation of the chamber in which the liquid is heated or cooled from the chamber that contains the calibration volume in which the thermometers are placed.

The geometry of parallel tube is also important, with the shape and angle of the curves optimised for temperature uniformity.

The new Libra Model 785 achieves this with the same parallel tube assembly as used in the 915 packaged into a different case and now with internal refrigeration can be used to lower temperatures. The cooling power varies dynamically with the benefit of giving greater stability at lower temperatures.

Parallel Tube Liquid Bath Libra Model 785

Specifications

ModelAll Models785L785M785H
Temp Range-80°C to 125°C-40°C to 125°C30°C to 300°C
Volume98mm diameter, 485mm deep98mm diameter, 485mm deep98mm diameter, 485mm deep
Absolute Stability:±0.006°C±0.006°C±0.006°C
Direct in liquid(water, 50°C)(methanol, -80°C)(methanol, -40°C)(C10 Oil, 125°C)
Vertical Uniformity From <1mK – see evaluation reportFrom <1mK – see evaluation reportFrom <1mK – see evaluation reportFrom <1mK – see evaluation report
Heating Time25°C to 125°C < 50 mins (c10 Oil)25°C to 125°C < 50 mins (c10 Oil)30°C to 250°C < 150 mins (VH Oil)
Cooling Time0°C to -80°C < 300 mins (methanol)10°C to -40°C < 180 mins (methanol)–
Display Resolution (whole range):0.01°C0.01°C0.01°C
Liquid Height (above surface)3mm3mm3mm
DesignParallel Tube: separate Calibration and Mixing ChambersParallel Tube: separate Calibration and Mixing ChambersParallel Tube: separate Calibration and Mixing Chambers
CommunicationsIncludes serial interface, PC Cable and softwareIncludes serial interface, PC Cable and softwareIncludes serial interface, PC Cable and software
Dimensions485mm wide, 525mm deep, 1150mm high485mm wide, 525mm deep, 1150mm high485mm wide, 525mm deep, 1150mm high
Weight78kg68kg48kg
SafetyCompliant to CE RegulationsCompliant to CE RegulationsCompliant to CE Regulations
Power2.8kW 108-130 or 208-240V 50/60Hz1kW 108-130 or 208-240V 50/60Hz800W 108-130 or 208-240V 50/60Hz
How to order785L785M785H

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