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The production in 1946 began with mechanical pressure and temperature gauges. The company held its position as one of the world market leaders also after the classical manometry was more and more replaced by electronic pressure and temperature measuring and display devices. In 2010 Wika produced more than 43 Million units.
The theoretical basis for thermometers is the zeroth law of thermodynamics which postulates that if you have three bodies, A, B and C, if A and B are at the same temperature, and B and C are at the same temperature then A and C are at the same temperature. B, of course, is the thermometer.
The integrated circuit sensor may come in a variety of interfaces — analogue or digital; for digital, these could be Serial Peripheral Interface, SMBus/I 2 C or 1-Wire.. In OpenBSD, many of the I 2 C temperature sensors from the below list have been supported and are accessible through the generalised hardware sensors framework [3] since OpenBSD 3.9 (2006), [4] [5]: §6.1 which has also ...
A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. the visible scale that is marked on a mercury ...
Several units were used to measure length. Legua was approximately equal to 2 2/3 in, [2] which is substantially different from the value of a Legua in Spanish customary units and a League elsewhere, which varied from about 1,500 metres to 11,000 metres.
The most common ion gauge is the hot-cathode Bayard–Alpert gauge, with a small collector inside the grid. [1] A glass envelope with an opening to the vacuum can surround the electrodes, but usually the nude gauge is inserted in the vacuum chamber directly, the pins being fed through a ceramic plate in the wall of the chamber. Hot-cathode ...
Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge blocks come in sets of blocks with a range of standard lengths.
The power consumption is drastically reduced compared to continuously operated Pirani gauges. The gauge's thermal influence on the real measurement is lowered considerably due to the low temperature threshold of 80 °C and the ramp heating in pulsed mode. The pulsed mode can be efficiently implemented using modern microprocessors. Disadvantages