thermal bulb

thermal bulb

[′thər·məl ¦bəlb]
(engineering)
A device for measurement of temperature; the liquid in a bulb expands with increasing temperature, pressuring a spiral Bourdon-type tube element and causing it to deform (unwind) in direct relation to the temperature in the bulb.
References in periodicals archive ?
120 class of accuracy 2, 5 length of the connecting capillary - 6 depth of immersion of a thermal bulb - 160 mm diameter of a thermal bulb 16 mm, material of a thermal balloon - brass, type of protective sheath of a capillary - type ip54 protection degree, microswitches, breaking capacity of contacts - 50 va
Traditional thermal bulbs will be replaced with energy-saving compact fluorescent lamps.