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Calibration Baths, Hydra Series Oil Baths
Isotech, HYDRA series Calibration Baths (-80°C to 300°C)
 
Liquid Calibration Baths, -80C to 300C (572F) in Three Models
  • Parallel Tube Action: Liquid flows up the rear volume of the bath and down the working volume. This action creates very small vertical and axial gradients. Enabling the smallest overall uncertainties
  • Circular Design: The circular design eliminates cold corners in tank-shaped baths
  • Heating:All heating is outside the container. By using a large area nickel foil heater the complete bath wall is heated uniformly
  • Cooling: The cooling is built-in and also surrounds the calibration volume creating a low temperature ambient in which the heater can function efficiently
  • Wider Temperature Range:A unique system removes the coolant from around the calibration volume above ambient and lets the bath heat up to 125C (121C is a key sterilization temperature)
  • Stability Better than 0.030C over the complete temperature range

Product Code: 798 HYDRA
 

   Product Description    Specifications
 
Precision calibration of thermometers calls for the use of stirred liquid calibration baths. The Hydra models set new standards in terms of price-to-performance ratio. Now Calibration Engineers and Metrologists can choose from a range of baths that offer good immersion depth and parallel tube action, giving the best uniformity, smallest calibration uncertainties, and wide temperature ranges.

Hydra offers these features in a new price class. Dont settle for a bath with shallow immersion or simple stirred action when these Isotech baths provide good depth of immersion and good temperature uniformity, along with the other benefits Isotech baths offer.

The immersion depth of 300mm allows the requirements of Supplementary Information to the ITS-90 to be met. This publication from BIPM recommends immersion depths of 15 to 20cm from -50C to 50C, and from 20 to 27cm at 200C. Many baths in this price range are simply not deep enough to meet this requirement. Rather than simply stirring a square tank of liquid, the Hydra uses parallel tube action for superior temperature uniformity. Like other Isotech liquid baths, the calibration volume is cylindrical to suit thermometers, not a large square tank. The bath is filled with just 5 litres of liquid, reducing filling and ongoing cost of ownership as liquids are replenished. The 798H and 798EHT feature a cooling coil, which can be attached to an external source of either cold water or gas to further reduce cool-down times.

Hydra benefits from Isotechs experience: it drains faster, is easier to use, safer, and more convenient. Accessories allow a wide range of thermometers, for example, to be readily clamped by the Sensor Support and ITS-90 Fixed Point Cells are accommodated with the adjustable cell holder.

Literature
798 Datasheet Hydra Manual Hydra Evaluation Report Intro to Liquid Baths
798 Hydra Datasheet 798 Hydra Manual 798 Hydra Evaluation Report Guide to Comparison Equipment