| 摘要 |
Optical indictor of the membrane position of the expansion vessel is a cylindrical housing (19), closed by a glass window-pane (22) having spider lines (26) with two telescopic tubes: a fix one (14) with a battery lamp (17) and a movablbe one (15) closed by an ocular flap (13). Optical indicator is mounted on a top dished end plate (1) of expansion vessel, thus the direction of longitudinal axis (8) goes through under the angle &OHgr; through a centre 'O' of the bottom dished end plate (9). Variation of water temperature results in dilatation of the capacity of the same one, accepted by the vessel into a room (11) varying a membrane shape (10), thus firmly oriented spider lines (26) visually move along the surface of the membrane (10) that from the gasseous side (2) is coloured in circular surfaces: 3 (white) -stock, 5 (blue) - useful capacity and 6 (red) - outside the useful capacity. User may on the grounds of visual projection of the spider lines (26) on some of the surfaces (3,5 or 6) to determine instantaneous fluid parameters inside the expansion vessel.
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