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Laboratory Thermometers


General Purpose/ Laboratory Thermometers
Our general purpose mercury or red spirit filled glass thermometers serve your need for economical, quick and precise measurement of temperature in the laboratory.

These are available with the common features as follows:
Range -10/50 °C, -10/110 °C, -10/150 °C,
-10/250 °C ,-10/360 °C & as per requirement
Least Count/Graduation: 1 °C, 0.5 °C or 0.25 °C
Total Length: 305mm, 450mm, 600mm
Immersion Length: 76mm, 100mm, 150mm




Minus Range Glass Thermometers
Accurate minus range temperature measurement all the way to -100 °C, our Minus Range of specialty thermometers are filled with a special red spirit filling to allow precise measurement in the full range of operation.

These are available with the common features as follows:
Range -100/100 °C, -100/50 °C,
-50/50 °C, -50/100 °C
Least Count/Graduation: 1 °C, 0.5 °C
Total Length: 305mm, 450mm, 600mm
Immersion Length: 76mm, 100mm, 150mm




ASTM / IP / IS Standard Glass Thermometers
Standard thermometers manufactured in strict accordance with the specifications issued by the American Society of Testing & Materials (ASTM), Institute of Petroleum (IP) and the Bureau of Indian Standards in IS 2480 (Part I) : 1983 IP/ASTM/ Liquid-In-Glass thermometers are generally used in petroleum & related product testing .
IP /ASTM thermometers are generally used in OIL marketing & testing labs, petroleum refineries & companies making various lubricants and other related chemicals.. We specialize in such thermometers and have customers using our products since last 40 years and very much satisfied with our quality. There are various ranges of IP/ASTM thermometers which are equivalent to each other i.e they there specifications are same and they can be used in place of each other. Each & every thermometer can be supplied with /without calibration certificate

These are available with the common features as follows:


Range As per Standard
Least Count/Graduation: As per Standard
Total Length: As per Standard
Immersion Length: As per Standard
Filling As per Standard



Maximum-Minimum Thermometer

It consists of a U-shaped glass tube with two separate temperature scales set along each arm of the U. One of these is for recording the maximum temperature encountered and the other for the minimum temperature. The arms of the U-shaped tube terminate in sealed glass bulbs. The bulb at the top of the minimum reading scale arm is full of alcohol, the other contains a vacuum (or low pressure alcohol vapour).

alcohol, the other contains a vacuum (or low pressure alcohol vapour). Detail of the thermometer bulbs of the maximum minimum thermometer shown above. The left-hand (minimum arm) bulb is full of alcohol. This bulb measures the temperature by the expansion and contraction of the liquid. The right-hand (maximum arm) bulb contains alcohol and a bubble of low-pressure gas or alcohol vapour. This bulb accommodates the expansion in the other bulb and allows the train of alcohol and mercury to move in the U-shaped tube as the temperature changes.

mercury to move in the U-shaped tube as the temperature changes. In the bend of the U is a section of mercury, a metal which is liquid at normal temperatures. This is pushed around the tube by the thermal expansion and contraction of the alcohol in the first bulb as it responds to the external temperature. The near vacuum in the other bulb allows free movement of the alcohol and mercury. It is the alcohol which measures the temperature; the mercury indicates the temperature reading on both scales. This is unlike a normal mercury thermometer, in which the expansion and contraction of mercury itself indicates temperature

The thermometer shows a reading at the top of the mercury section on both the maximum and minimum scales; this shows the current temperature and should be the same on both scales. If the two readings are not the same, then the instrument scales are not correctly positioned or the instrument is damaged

The maximum and minimum readings are recorded by two small steel markers which are sprung into the capillary tube so that they can slide, but only if a force is applied to them, either by being pushed by the mercury or under the influence of an external magnet.

To take a reading, the positions of the ends of the markers nearest to the mercury are examined. Their positions on the maximum and minimum scales show the highest and lowest temperatures encountered since the last reset.




Maximum Thermometer( Shake Down Type)
Maximum Registering thermometers are designed to hold the temperature indefinitely, so that the thermometer can be removed and read at a later time or in a more convenient place. Mechanical registering thermometers hold either the highest temperature recorded, until manually re-set, e.g., by shaking down a mercury-in-glass thermometer, or until an even more extreme temperature is experienced.










Faden Thermometers
A Faden thermometer gives a convenient and accurate measurement of the emergent stem temperature of a partial immersion thermometer or a total immersion thermometer immersed as a partial immersion.Faden thermometers have long bulbs measuring between 5 and 20 cms with wall thickness and bore sizes nearly the same as the the ordinary thermometers. The bulb length is selected to approximate that of the emergent stem whose temperature is to be measured. The stem of the faden thermometer has a finer capillary than its bulb . The reading of faden thermometer or thermometers will indicate the mean temperature value of the area surrounding the bulb, which is also the mean temperature value of the adjacent portion of the thermometer stem.

These are available with the common features as follows:

Range As Required
Least Count/Graduation: 1 °C, 0.5 °C
Total Length: As Required
Bulb Length: As Required