Holding block ITL-M-18205

Description
This boiling-point maintenance apparatus is designed to create and maintain the liquid/vapor equilibrium (boiling point) of liquid nitrogen (or liquid argon) for calibration of thermometers according to EIT-90.

• -185 to -196°C
• Liquid nitrogen boiling point (-195.798°C)
• Gas manifold for thermometers
• Can be used as a standalone unit or mounted on a bench

Operation
The system is self-contained and cooled using either liquid nitrogen or liquid argon, supplied locally. Liquid nitrogen is generally less expensive and more readily available than liquid argon. No electrical power is required for operation. The system can maintain the liquid/vapor equilibrium point of nitrogen (-195.798°C) or argon (-185.8468°C) indefinitely while supplied with cryogen at temperature. It enables calibration by comparison at the lowest point defined by EIT-90.

Construction

• Stainless steel Dewar
• Internal equalizing block with 3 wells for 3 thermometers
• Top connections for filling and monitoring the coolant liquid level
• Safety pressure relief valve
• Manifold to thermally connect test thermometers to the equalizing block using gaseous helium (option)

Technical characteristics / specifications

• Model: ITL-M-18205
• Nominal temperature range: -185°C to -196°C
• Uncertainties: ±0.002°C. The temperature gradient along the copper block is less than 2 mK. Add the uncertainty stated in the calibration certificate. Additional uncertainties apply when comparing dissimilar probes.
• Dimensions: Length under flange: 430 mm
  Diameter under flange: 127 mm
  Flange diameter: 65 mm
• Weight: 14 kg