Two methods were used to monitor water vapor passage through the specimens: chilled mirror hygrometer
and mass loss.
Edgetech Instruments Dew point hygrometers
combine the inherent accuracy, reliability and long term stability of optical chilled mirror technology with the convenience and ease of use demanded by Industry.
To respond to these new requirements, Yamatake has developed the FDW20 low dew point version of the FINEDEW chilled mirror hygrometer
, which offers an expanded measurement range.
There are a number of potential solutions, but before you try one, I'd recommend that you buy an inexpensive hygrometer
(see photo) to monitor your indoor relative humidity.
The humidity is reduced by using inexpensive, disposable or reusable desiccant and can be monitored with the door mounted dial hygrometer
. The Secador Mini Desiccator is also available as a gas purged model that requires very low volumes of gas to maintain a desired environment.
GE Panametrics have developed the PM880 hand-held portable hygrometer
. It introduces a versatile and accurate means of moisture measurement in industrial gas or hydrocarbon liquid applications.
All data that is measured by the inbuilt barometer, hygrometer
and thermometer can be viewed in real-time and used to refine official forecasts locally or predict wind or local storms.
In line with our article on soldier communications found in this issue, one further piece of equipment, one very important piece--that combines altimeter, barometer, thermometer, anemometer and hygrometer
into one very small unit--is worthy of note.
According to the company, the Protimeter allows users to switch between moisture meter and hygrometer
modes of operation, improving their understanding of the extent and nature of dampness-related problems in buildings.
Operating from a nominal 5 Vdc supply, the modules can be used with virtually no additional circuitry, and connection to a digital voltmeter converts them into a precision hygrometer
. The custom ASIC circuitry incorporates voltage regulation, sensor drivers, linearization, temperature compensation, and signal conditioning to output a fully conditioned, linearized 0-1 Vdc signal.
Michell Instruments has launched a new, easy to use hygrometer
for use in the natural gas industry.
The reliable, old-fashioned, hand-operated sling psychrometer costs about $100 (the lazy-person's unit with a battery-operated fan costs about $50 more), and the newest type of device, the digital pen-style pocket hygrometer
, costs about $50.