Liquid mercury barometers are in use on a daily basis in many hospitals and medical labs around the country.  These facilities use the barometers to find the local air pressure in order to calibrate various pieces of medical equipment. The Eco-celli barometer reads altitude adjusted barometric pressure.  Most medical facilities need the actual air pressure, not altitude adjusted air pressure, at what ever altitude they are located.  The Eco-celli does not read absolute or true pressure for altitudes above sea level.  The Eco-celli could only be used by medical facilities located at sea level where true pressure and altitude corrected pressure are the same value.  (Note: If you are confused about this, please call us at 978-649-8547 and we will be happy to explain it to you.)  The growing awareness of the danger of mercury and the potential great cost of a mercury spill clean-up has motivated many facilities to look for a suitable replacement barometer and in certain specific circumstances, the Eco-celli will meet that need.

In August, 1998 DD Barometers of Belgium patented the first non-mercury liquid barometer having the same accuracy as a mercury barometer in measuring atmospheric pressure.   They named their barometer the Eco-celli after Evangelista Torricelli, the inventor of the barometer.  The Eco-celli contains no mercury.  The 64 inch long U-shaped glass tube is filled with a red fluid and gas (Boyle's Law).    Because of the length of the barometer tube, the barometers scale is four times larger than a standard mercury scale making it much easier to read. 

The precision thermometer is filled with blue colored methyl alcohol.  An increase or decrease in temperature can cause the fluid in the barometer to expand and affect the pressure reading.  This is corrected by setting the movable scale, which is attached to both the  barometer and thermometer, to the top of the blue fluid in the thermometer and then taking your reading from the red barometer tube. 

The Eco-celli barometer costs 1/3 to 1/2 less than a comparable mercury barometer.  Given the low cost and and non-mercury operation, replacing mercury barometers now is a sensible option.  

We  recommend the E038.501 acrylic model pictured to the left.  Click on this link for more details:  Model E038.501 Acrylic.   Also see the matching acrylic P1 Psychrometer for measuring humidity.

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Last modified: April 02, 2007