FISCHER TEMPERATURE / HUMIDITY INDICATOR
Accurate Fischer Dial! Shows Relative Humidity and Temperature in both Fahrenheit and Centigrade at a glance
In Germany, Fischer and Lufft have been making fine meteorological instruments for over 100 years. Abbeon has been offering their high quality instruments here in the U.S. for over fifty years. The Fischer / Lufft instruments shown here have white faceplates with black lettering. Housing is solid brass, polished and lacquered.
The humidity is sensed by a Durotherm element that is a synthetic hygroscopic fiber that expands and contracts in response to the moisture in the air. The thermometer is actuated by a bimetallic spring which transmit changes in temperature through expansion and contraction. The Abbeon Certified Hygrometer Model HTAB-176 is certified to be accurate within ± 3% RH (30 ... 95%), + 1 scale division. The dial indicates the complete range of 0 to 100% relative humidity. The measurement of the temperature and relative humidity remains correct if the pressure goes up or down.
This is confirmed for the pressure range of 600 … 1200 hPa (mbar) = 8.7 … 17.4 PSI.
Each instrument has been tested for accuracy at 3 points on the scale for high, medium and low readings. The calibration and certification are done under ISO-9001 control. The bi-metallic thermometer on the model HTAB-176 is accurate to ±1% of scale with a range of -20 to 100° Centigrade and 0 to 210° Fahrenheit.
Graduations are 1° for Centigrade, 2° Fahrenheit and 1% RH. One-year guarantee. Some of our humidity indicators working on the same principle as this instrument have been in use for over 10 years and are giving satisfactory service day after day, month after month, and year after year. Both the humidity and temperature are directly read without any calculations whatsoever.
Solid 6-inch overall case drilled for wall mounting. Shipping weight: 3 pounds. Color differentiated 5-inch dial with black letters and numbers and a red pointer.