ASME B40-200-2008 pdf download

ASME B40-200-2008 pdf download.Thermometers, Direct Reading and Remote Reading.
connection, right-side: one in which the stem projects from the right side of the case, parallel to the dial, as viewed from the front. connection, top: one in which the stem projects upward from the case, parallel to the dial (see Fig. 2). connector: the component that joins the stem to the case assembly. connector, jam nut: a connector using a straight-thread nut and seating part for connecting the thermometer to a bushing, flange, or thermowell. connector, plain: a connector with no threads. connector, threaded: a connector with fixed threads, usu- ally tapered. connector, union: a threaded fitting that is rotatable rela- tive to the case. correction: the quantity that is algebraically added to an indicated value to obtain the true value. The algebraic sign of correction is the opposite of the sign of the error (see also error). corrosion failure: see failure, corrosion. coupling nut: see connector, jam nut. crystal: see window. dampening: a method used to reduce the effects of shock and vibration, usually the application of a viscous mate- rial to the bimetallic element and/or bearing. dial: the component that contains the scale. dial, anti-parallax: see dial, mirror; dial, multi-plane. dial, dished: see dial, multi-plane. dial, dual-scale: a dial containing two scales with different units of measure, such as °F and °C. dial, graduations: the individual division marks of a scale. dial, mirror: a dial with a reflector band for the purpose of reducing parallax error. dial, multi-plane: a dial with graduations in approxi- mately the same plane as the pointer (to reduce parallax error). dial, rotatable: a feature that allows rotation of the dial relative to the pointer. diameter, stem: the outside diameter of the stem. element, bimetallic: the temperature-responsive compo- nent. It is composed of two or more metals mechanically associated in such a way that relative expansion of the metals, caused by temperature change, produces motion. element, bimetallic helical: a bimetallic element formed in the shape of a helix. environmental conditions: see conditions, environmental. error: the difference between the true and indicated val- ues of the variable being measured. A positive error 3 denotes that the indicated value is greater than the true value (see also correction). error, friction: the difference between the indicated values before and after the thermometer has been lightly tapped. error, parallax: reading error induced by visual misalignment. Fahrenheit: U.S. customary unit of temperature measure- ment, abbreviation °F. failure, corrosion: failure caused by environmental or pro- cess-corrosive chemical attack. failure, over-temperature: failure caused by environmental or process exposure to temperatures in excess of rated temperature limit (see para. 6.3). failure, vibration: failure caused by exposure to vibration (see para. 6.6). friction error: see error, friction. friction ring: see ring, friction. graduations, dial: see dial, graduations. hermetically sealed: see case, hermetically sealed. jam nut: see connector, jam nut. length, immersion: the distance from the free end of the stem to the point of immersion in the medium. This length must be greater than length, sensitive portion (see para. 3.6.4). length, insertion: the length from the free end of the stem to, butnotincluding, the external threads or othermeans of attachment. length, sensitive portion: the length of that section of the stem enclosing the bimetallic element. length, stem: the distance from the free end of the stem to the underside of the wrench flat portion on the threaded connector. The stem length of a plain stem thermometer is the distance from the free end of the stem to the connector or, where there is no connector, to the case (see Fig. 3). lens: see window. liquid-filled case: see thermometer, liquid-filled. mirror dial: see dial, mirror. NPT: American National Standard Taper Pipe Thread (ASME B1.20.1). parallax: see error, parallax. pointer: the component that, in conjunction with the dial, indicates temperature. pointer, maximum: a component that is moved by the indicating pointer to the maximum temperature indi- cated and remains at that point until reset. Inclusion of this accessory may affect the thermometer’s accuracy.