Parr-instrument Performa Therm Liquid Calorimetric Thermometers Manuel d'utilisateur télécharger pdf

No. 415M

OPERATING INSTRUCTIONS

for PerformaTherm Liquid Calorimetric Thermometers

Inspect each thermometer carefully. Although Parr calorimetric

thermometers are filled with nitrogen above the liquid, this gas filling will

not prevent the liquid separations, which usually develop in a new

thermometer due to temperature extremes and rough handling in

shipment. It is important, therefore, that each new thermometer be

examined carefully for liquid separations and for entrapped gas bubbles

which must be eliminated before the thermometer is installed in a

calorimeter. Procedures for examining a new thermometer and for

rejoining any separations are given in the instructions that follow.

Handle with care. Do not use extreme heat when warming these

thermometers. The best procedure for raising the liquid to the top of the

stem is to warm the bulb in the palm of the hand. Or the bulb can be

immersed in warm water, but the water temperature should never be

higher than 35 °C. Never bring the liquid into the top chamber. Since

PerformaTherm thermometers react very quickly to changes in

temperature being measured, it is important that when running the liquid

from a higher temperature to a lower temperature (in the down direction)

you do not surpass a rate of 20° per minute. When going from a lower to

a higher temperature there is no restriction on rate of rise.

PerformaTherm thermometers react to temperature similarly to mercury

thermometers. Once at temperature, leave thermometer in medium being

tested three minutes before reading.

Examine with a magnifier. Examine each new thermometer with the

thermometer reading lens before installing it in a calorimeter. Inspect the

entire liquid thread for separations or gas bubbles and examine the gas

filled chamber above the liquid for any small droplets which may have

become separated from the main body and remain attached to the

capillary wall.

Always store vertically. A calorimetric thermometer in good condition

should never be put away in a drawer. Always store this type of

thermometer in a vertical position, bulb down.

PARR INSTRUMENT COMPANY

211 Fifty-Third Street, Moline, Illinois 61265 USA

Phone 309/762-7716 Fax 309/762-9453

Telex 270226

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Page 1 - OPERATING INSTRUCTIONS

No. 415M OPERATING INSTRUCTIONS for PerformaTherm Liquid Calorimetric Thermometers Inspect each thermometer carefully. Although Parr calorim

Page 2 - Revision 1-03-02

RE-JOINING LIQUID SEPARATIONS All thermometers, including PerformaTherm, experience occasional separations, especially during transit. I

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Parr-instrument Performa Therm Liquid Calorimetric Thermometers Manuel d'utilisateur

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