Thermostat for permeation tube humidity generator

Abstract

The invention relates to a thermostat for a permeation tube humidity generator, and belongs to the field of constant temperature for gas component mixture techniques. Four paths of identical permeation chambers are embedded in the thermostat. The thermostat is internally provided with a gas circuit preheating dark channel, gas enters from the bottom parts of the permeation chambers after one heat cycle, and gas outlets are formed in the side wall of the thermostat. The thermostat further comprises temperature control platinum resistor channels and temperature measurement platinum resistor channels, which are distributed on the two sides of a center hole, the temperature control platinum resistor channels are close to heating rod channels, the temperature measurement platinum resistor channels are close to the permeation chambers, and an internal heating mode is adopted. The thermostat ensures that the temperature in the permeation chambers is monitored through a temperature controller and the thermal field is even and stable at the temperature of 100 DEG C. In addition, the phenomena of deformation and distortion of a connection pipeline in the process of dismounting are avoided. A thermal insulation material is wrapped by a polyurethane foaming agent to realize cleanness and convenience, and the permeation chambers are not polluted in the process of changing a permeation tube. The thermostat is compact in design structure and light in weight, and is convenient to carry.

Description

technical field [0001] The invention relates to a constant temperature body for an osmosis humidity generator, which belongs to the field of constant temperature for gas distribution technology. Background technique [0002] Humidity generators in the field of low humidity measurement are based on many principles, such as dual temperature and dual pressure method, mixing method, osmotic method, etc. However, due to the lack of sufficient and reliable standard humidity generators for on-site calibration in the low-humidity measurement field, compared with other methods, the osmotic humidity generator has the advantages of simple structure, small size, easy portability, easy value transfer, low price, and convenient operation. The accuracy can meet the verification requirements of general humidity measuring instruments and meet the needs of on-site calibration. [0003] The accuracy of the output standard moisture value of the permeation method humidity generator is mainly re...

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Problems solved by technology

[0005] CN 00214154, CN 02222688, and CN 1765474A disclose permeable gas distribution devices, all of which do not mention the influence of the constant temperature and body temperature field used by the device

CN 2421650Y permeation tube rapid dynamic gas distribution device mentions fewer permeation chambers of constant temperature heating devices, which are used for standard sample gas distribution; and there is no gas preheating channel, resulting in cold gas directly entering the permeation chamber without thermal circulation, resulting in The standard sample gas is unstable; because it is heated by winding heating wire, that is, external heating, the heating wire is wrapped with insulation cotton, resulting in a large volume, which cannot meet the requirements of portability

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