Niskin water sampler with rotating stand and tipping thermometer

 Niskin water samplers are used alone, attached to a wire rope or similar device, or integrated into a CTD water sampling system. If the water sampling tube has a rotating stand attached to it, a tipping thermometer* can be used to measure the depth and water temperature at the time of sampling ( Fig. 14 ).

Fig. 14 Operation of the tipping thermometer in the Niskin water sampler

a) Rotate the thermometer frame and turn it upside down, and secure it with a nylon teg.　b) When the water sampling trigger is actuated, the nylon tegs are released and the thermometer frame rotates 180 degrees with the rotating stand by the elasticity of the rubber tube.

※ Tipping Thermometer

 A special glass-mercury thermometer that, when tipped over, cuts the mercury bulb and the mercury column at the cutting point, and the length of the mercury column at the time of tipping over is preserved. By comparing the indicated values of the "protective pressure type" which is not subject to water pressure, and the indicated values of the "exposed to pressure type" which is subject to water pressure, the depth of water (or more precisely, water pressure) at the time of tipping over can be determined.

Fig. 15 Tipping Thermometer

主温度計　main thermometers

副温度計　secondary thermometers

防圧型　protective pressure type

被圧型　exposed to pressure type

転倒　tipping

死菅　dead pipe

切断点　cutting point

環状部　ringside