Field usable calibrator for humidity meters

Details Field usable calibrator for humidity meters Field usable calibrator for humidity meters

1989-09-27

1991-03-12

Noland, Tom

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

239 34, G01D 1800

Patent

active

049984314

ABSTRACT:
Disclosed herein is a humidity calibrator device including a base part sealed by plugs, and a replaceable humidity calibrator cartridge. The cartridge contains saturated vapor, saturated salt solution and salt crystals. The cartridge is sealed with a semipermeable membrane and an air-tight protective peel-off foil. The semipermeable membrane, which seals the part of the humidity calibrator cartridge entering the base part of the apparatus provides a separation of the compartment in the base of the apparatus and liquid containing space of the cartridge, allowing permeation of water vapor and preventing permeation of the liquid.

REFERENCES:
patent: 2239628 (1941-04-01), Seki
patent: 3209579 (1965-10-01), Roberts
patent: 3412935 (1968-11-01), O'Keeffe
patent: 3618911 (1971-11-01), Martin
patent: 3760773 (1973-09-01), Christensen
patent: 3776023 (1973-12-01), Budd et al.
patent: 3832882 (1974-09-01), Schuen, Jr.
patent: 3856204 (1974-12-01), Chand
patent: 4136550 (1979-01-01), Pott
patent: 4139942 (1983-08-01), Chand
patent: 4849174 (1989-07-01), Brandt et al.
Patent Abstracts of Japan; GRP P465; vol. 10, No. 160 ABS pub. date Jun. 7, 1986 (61-13146).

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