Meteor-Optic Tabletop Compensated Sympiesometer   |    Ref: ME-TTS002

This instrument embodies a compensation system, patented by Meteormetrics Limited, which makes it easy to read an accurate figure for the barometric pressure at any temperature in its working range.

The device consists of a captive gas volume, adjustable using a brass thumbwheel, connected to a glass helix dipping under the surface of coloured fluid as in model TTS001. It differs from the latter, however, in that it incorporates a thermometer, the bulb of which is enclosed by the captive gas vessel and the stem of which extends downwards along the axis of the glass helix.

The thermometer is designed to exhibit a rate equal to the expansion rate of the air in the captive gas vessel so that the thermometer thread keeps pace with the level of liquid in the glass helix. Thus the vertical distance between the level in the helix and the position of the thermometer thread will give the atmospheric pressure directly in millibars. Moreover, the helix provides an expansion of scale. Each full turn represents 10 millibars, so the user can easily read the pressure to a precision of one millibar by observing the radial position of the meniscus around the helical turn. Thus it is possible to read the pressure rather as the hour is read on a clock face.

This results in an instrument, which though made almost entirely of glass and without a scale, can be used to read the atmospheric pressure to a high degree of accuracy.

Dimensions:
360mm Height
approx 55mm Diameter