Marsh Vapor Actuated Thermometer Meter Gauge #15607 30-220° F

Description

You are bidding on:
Marsh Vapor Actuated Thermometer Meter Gauge #15607 30-220° F
New old stock.  Capillary is 6 feet long.  Adjustable direction, 3" long Copper tube.
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OPERATING PRINCIPAL:
A vapor actuated thermometer is essentially a pressure system with a sensing bulb at one end connected by a capillary to a pressure gauge at the other. The bulb is filled with a liquid which vaporizes as the temperature rises. This causes the pressure in the gauge bourdon tube to rise and move the pointer to indicate the measured temperature.
This temperature-to-pressure relationship is non-linear which means that the graduations on the line end of the scale are close together, whereas the graduation on the upper end are spaced farther apart. Changes in ambient temperature along the capillary or at the scale do not affect the thermometer readout. This means that capillary up to 75' long can be used without the need for ambient temperature compensation.
Please see all pictures and ask any questions BEFORE purchasing.
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