Gas sorption instruments are used to measure surface area and pore size of porous materials and powders. While most of such measurements are done at cryogenic temperatures using liquefied gases, many applications benefit from measurements at a very different temperature such as those around room temperature or the freezing point of water. These higher temperatures must still be well controlled, i.e thermostatted. This is best done by actively cooling/heating to ensure temperature stability rather than, at 0degC for example, relying on melting ice. This is normally achieved by using refrigerated, heated circulator baths. While these perform very well and have quite wide temperature range capabilities1, they are often too large, too power hungry, and simply too much for smaller thermostatting jobs. In contrast, the thermo-electric device uses peltier devices to both cool and heat the circulating fluid contained in a closed bath; this means very low evaporation of the fluid and fast response times. It can be used with the following "recirculating dewar kits":
for the NOVA: p/n 01655-7757
for the Quadrasorb: p/n 01655-7757-SI
for the autosorb-iQ: p/n 01655-7757-iQ
1a wider temperature range (-28degC to 100degC) is available with refrigerated/heated compressor-style bath circulators p/n's 02126-1 (100-120V) and 02127-1 (220-240V).
The new accessory is also the ideal partner for Quantachrome's gas pycnometer, the Ultrapyc-T 1200e, a density analyzer equipped with built-in circulation coils with an external port for connection to a circulator-style thermostat. The peltier does away with having separate heating and cooling elements and the associated refrigerant compressor, and so the new circulator is better matched in size (12"W x 12"D) and thermal specifications to the pycnometer.
The thermoelectric device can cool down to -5degC2, and heat up to 65degC2. It is supplied with the necessary connectors and hoses. Operating voltage range: 90 - 240V. p/n 02125-TE-1
2when used with the Ultrapyc-T 1200e it should be operated between 15 - 50degC under non-condensing ambient RH conditions.
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