How To Fix A Thermometer With Separated Mercury

INSTRUCTIONS FOR REUNITING (rejoining)
SEPARATIONS IN LIQUID IN Drinking glass THERMOMETERS

We empathize that separation of the liquid column is unsightly, but non a defect of the product.
Separation unfortunately happens during transit, extreme changes in temperature, trauma to the instrument, improper storage, etc. Any separation must exist rectified prior to utilise or inaccurate readings will exist obtained.

All of out precisions thermometer are closed under extremely loftier nitrogen pressure while cartoon the mercury into the lower portion of the capillary. This Process, when coupled with acid done tubing and triple distilled mercury, although costly, greatly reduces the frequency of separations in the capillary portion of the thermometer. All the same, though misuse or rough treatment during shipment, separations do occur.

Many instructions for rejoining separations begin with "the mercury tin be retracted into the bulb by immersing information technology in a suitable mixture of dry water ice and booze".
This statement is not specific enough. We recommend you determine the type of separation from the illustrations provided and keep co-ordinate to the instructions outlines beneath.

SEPARATION AT UPPER PORTION OF MERCURY Column
Reuniting Upper Section
Most well-constructed thermometers contain an expansion sleeping room or blister at the extreme top of the capillary. This chamber serves a twofold purpose. 1, to accommodate an overflow of mercury when the thermometer is field of study to temperatures in excess of its scale range, and 2, as a means of rejoining this type of separation, While holding the instrument in a vertical position, slowly oestrus the bulb until the separated segments and a portion of the main (intact) column enter the bedchamber. (Great care must be taken to insure that the mercury does not fill more than than ½ to ¾ of the chamber volume: otherwise, breakage of the bulb will result). The nitrogen pressure will force a rejoining of the mercury. Still belongings the thermometer vertically, examine the column equally information technology cools and retracts to exist sure it is intact.

SEPARATION IN THE Contraction CHAMBER
Reuniting Chamber Scetion
Separation of the mercury in the contraction chamber is an entirely dissimilar trouble. Many thermometers contain scale ranges that brainstorm well above ambient temperature. These Thermometers take a contraction chamber or enlargement that prevents the mercury from entering the seedling at ambient temperatures. Heavy jarring of the instrument or thermal stupor can crusade separation in the chamber. If the separated mercury is in the class of a speck or small corporeality, invert the thermometer and gently tap it confronting palm of the hand. This will crusade a larger separation, calculation additional volume and weight to the separation portion. The thermometer should and then be righted and only the tip of the bulb should be dipped in ice water or salted ice water. Remove it from water and gently tap the bulb on a desk-bound blotter and allow the separation portion to fall to the bottom of the chamber and re-join the mercury reservoir. Allow thermometer to warm to room temperature and check to be certain all separations have been removed.

SEPARATION IN THE LOWER PORTION OF THE Column
Reuniting Lower Section
Separations of this type are less frequent and more difficult to repair. There are many variables and no one explanation volition cover all types of thermometer. The full general procedure is to subject field the bulb just to a temperature sufficient to retract all the mercury into the bulb. A dull return to ambient temperature will return an intact column. Our experience has shown that additional bug tin can be acquired in these procedures and we betoken out the following cautions. Cautions must be taken where a range is such that at the freezing betoken of mercury -38.8°C (almost the same in °F) mercury however remains in the capillary. If the thermometer is returned to ambient temperatures rapidly after freezing, there is a chance the bulb volition crack. This Breakage is caused by the mercury thawing in the capillary more than slowly then the mercury in the bulb, thereby creating an impasse to the expanding mercury. To avert the breakage, great care must be taken to allow the mercury in the bulb to liquefy at the same rate as the mercury in the capillary. While the thermometer is being allowed to return to ambient temperature, farthermost intendance must be taken to insure that it is not jarred or at the slightest angle while the mercury returns to the capillary. Without these precautions, gas bubbles could develop in the bulb and cause inaccuracies.
In this case, asking an RGA to return the thermometer to the manufacturer to reunite and return (at customer expense).

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