The Isotech Hydra range of calibration baths have proved very successful since their introduction in 2003. The Orion range has been introduced to fit alongside the Hydra models. The Orion calibration baths offer deeper calibration volumes than the Isotech Hydra series with world class temperature stability. There is a high temperature model (30°C to 300°C) and a model with built in refrigeration (-40°C to 125°C). These deep stirred liquid baths are suitable for the low uncertainty calibration of long thermometers including liquid in glass and extended length SPRTS. The Orion unit has sufficient depth, 470mm (18.5”), to accommodate Isotech’s largest Water Triple Point Cells providing a cost effective sub mK calibration system. There are accessories to hold Mercury, Water, Gallium and Indium ITS-90 Fixed Point Cells. Isotech baths have always been designed for thermometer calibration, setting the standard for immersion depth versus filling costs. As the Orion requires just 8.5L of fluid it offers significant cost savings, both initial and the ongoing running costs, when compared to other larger volume baths. In operation the liquid level is within 10mm of the top lid allowing calibration of liquid in glass thermometers without the need for complicated accessories. In addition to using a monocular to aid reading the scale I-Cal Easy automatic calibration software can capture images with low cost digital webcams. The Isotech Orion range provides many features that laboratories need but which other manufacturers often cannot supply....

The Isotech Hydra range of calibration baths have proved very successful since their introduction in 2003. The Orion range has been introduced to fit alongside the Hydra models. The Orion calibration baths offer deeper calibration volumes than the Isotech Hydra series with world class temperature stability. There is a high temperature model (30°C to 300°C) and a model with built in refrigeration (-40°C to 125°C). These deep stirred liquid baths are suitable for the low uncertainty calibration of long thermometers including liquid in glass and extended length SPRTS. The Orion unit has sufficient depth, 470mm (18.5”), to accommodate Isotech’s largest Water Triple Point Cells providing a cost effective sub mK calibration system. There are accessories to hold Mercury, Water, Gallium and Indium ITS-90 Fixed Point Cells. Isotech baths have always been designed for thermometer calibration, setting the standard for immersion depth versus filling costs. As the Orion requires just 8.5L of fluid it offers significant cost savings, both initial and the ongoing running costs, when compared to other larger volume baths. In operation the liquid level is within 10mm of the top lid allowing calibration of liquid in glass thermometers without the need for complicated accessories. In addition to using a monocular to aid reading the scale I-Cal Easy automatic calibration software can capture images with low cost digital webcams. The Isotech Orion range provides many features that laboratories need but which other manufacturers often cannot supply....

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, parallel tube action, giving the best uniformity and smallest calibration uncertainties, and wide temperature ranges. Hydra offers these features in a new price class, don’t settle for a bath with shallow immersion or simple stirred action when with 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 -50°C to 50°C, and from 20 to 27cm at 200°C. 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 Isotech’s experience, it drains faster, is easier to use, is safer, and is more convenient. Accessories allow a wide range of thermometers, for example, to be readily clamped by the Sensor Support and ITS-90 fixed points cells are accommodated with the adjustable cell holder....

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, parallel tube action, giving the best uniformity and smallest calibration uncertainties, and wide temperature ranges. Hydra offers these features in a new price class, don’t settle for a bath with shallow immersion or simple stirred action when with 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 -50°C to 50°C, and from 20 to 27cm at 200°C. 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 Isotech’s experience, it drains faster, is easier to use, is safer, and is more convenient. Accessories allow a wide range of thermometers, for example, to be readily clamped by the Sensor Support and ITS-90 fixed points cells are accommodated with the adjustable cell holder....

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, parallel tube action, giving the best uniformity and smallest calibration uncertainties, and wide temperature ranges. Hydra offers these features in a new price class, don’t settle for a bath with shallow immersion or simple stirred action when with 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 -50°C to 50°C, and from 20 to 27cm at 200°C. 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 Isotech’s experience, it drains faster, is easier to use, is safer, and is more convenient. Accessories allow a wide range of thermometers, for example, to be readily clamped by the Sensor Support and ITS-90 fixed points cells are accommodated with the adjustable cell holder....

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. 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....

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. 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....

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. 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....

The Isotech Model 915 Liquid Bath is suitable has a wide temperature range, using silicon oils and other suitable liquids. All components in contact with the liquid are of stainless steel, and are insulated with materials which are completely safe to use. The 915, used in conjunction with a chiller, utilizes the latest ozone friendly gases. The temperature range of the standard 915 liquid calibration bath (915H) is 40°C to 300°C. When the 915 is used in conjunction with our external chiller, the low temperature limit can be extended to -65°C. Liquids are circulated by a propeller, which mixes and forces the liquid through a specially designed orifice in the rear of the two parallel tubes. A variable speed motor optimizes the flow as the viscosity of the liquid changes. Below the orifice plate, liquid is circulated over a mineral-insulated heater and temperature sensors, which control the temperature of the bath. The liquid flows up the calibration tube and weirs over the tube into a collection tray, where it returns to the rear tube for recirculation. An angled side entry tube enables a refrigeration cooling probe to be inserted in the rear of the two parallel tubes. The temperature controller has resolution from 0.01°C to 0.1°C, which auto-scales to suit the four digit display (all digits can be read with the Cal NotePad Software). The 915 is fitted with serial communications for interfacing with a PC as standard....

The Isotech Model 915 Liquid Bath is suitable has a wide temperature range, using silicon oils and other suitable liquids. All components in contact with the liquid are of stainless steel, and are insulated with materials which are completely safe to use. The 915, used in conjunction with a chiller, utilizes the latest ozone friendly gases. The temperature range of the standard 915 liquid calibration bath (915H) is 40°C to 300°C. When the 915 is used in conjunction with our external chiller, the low temperature limit can be extended to -65°C. Liquids are circulated by a propeller, which mixes and forces the liquid through a specially designed orifice in the rear of the two parallel tubes. A variable speed motor optimizes the flow as the viscosity of the liquid changes. Below the orifice plate, liquid is circulated over a mineral-insulated heater and temperature sensors, which control the temperature of the bath. The liquid flows up the calibration tube and weirs over the tube into a collection tray, where it returns to the rear tube for recirculation. An angled side entry tube enables a refrigeration cooling probe to be inserted in the rear of the two parallel tubes. The temperature controller has resolution from 0.01°C to 0.1°C, which auto-scales to suit the four digit display (all digits can be read with the Cal NotePad Software). The 915 is fitted with serial communications for interfacing with a PC as standard....

The Isotech Model 915 Liquid Bath is suitable has a wide temperature range, using silicon oils and other suitable liquids. All components in contact with the liquid are of stainless steel, and are insulated with materials which are completely safe to use. The 915, used in conjunction with a chiller, utilizes the latest ozone friendly gases. The temperature range of the standard 915 liquid calibration bath (915H) is 40°C to 300°C. When the 915 is used in conjunction with our external chiller, the low temperature limit can be extended to -65°C. Liquids are circulated by a propeller, which mixes and forces the liquid through a specially designed orifice in the rear of the two parallel tubes. A variable speed motor optimizes the flow as the viscosity of the liquid changes. Below the orifice plate, liquid is circulated over a mineral-insulated heater and temperature sensors, which control the temperature of the bath. The liquid flows up the calibration tube and weirs over the tube into a collection tray, where it returns to the rear tube for recirculation. An angled side entry tube enables a refrigeration cooling probe to be inserted in the rear of the two parallel tubes. The temperature controller has resolution from 0.01°C to 0.1°C, which auto-scales to suit the four digit display (all digits can be read with the Cal NotePad Software). The 915 is fitted with serial communications for interfacing with a PC as standard....

If you have a large number of sensors to calibrate then this economically priced stirred liquid bath is the solution. The 820 bath has been introduced to provide a liquid calibration bath with a large volume. This is to allow the bath to be used with many temperature probes simultaneously immersed in the bath or with accessories. It may also be used to maintain standard resistors at a constant temperature. The liquid in the bath is heated to the set temperature and circulated by a propeller system. The Aquarium is of robust construction and the liquid is contained in a stainless steel insulated enclosure which has a calibration volume 185mm long x 140mm wide x 300mm deep. Refer to ‘Liquid Selection Guide’ on page 73 for information on liquids and important Health and Safety Information....