{"id":420,"date":"2019-03-27T10:12:40","date_gmt":"2019-03-27T10:12:40","guid":{"rendered":"https:\/\/sso2.com\/?page_id=420"},"modified":"2025-11-19T18:06:27","modified_gmt":"2025-11-19T18:06:27","slug":"glossary","status":"publish","type":"page","link":"https:\/\/sso2.com\/en\/glossary\/","title":{"rendered":"Glossary"},"content":{"rendered":"\t\t
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Glossary<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Also referred to as a vocabulary or definition of terms, we have put together some common terms that come up in reference to our precision O2 sensors.\u00a0 If you run across a term you are not familiar with, contact us.<\/p>

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Term<\/th>Definition <\/th>\n<\/tr>\n<\/thead>\n
ACCURACY<\/b><\/td>The quality of closeness to a specified value under stated conditions. Usually expressed as uncertainty \u2013 the maximum deviation to be expected between a reading or output and the actual value being measured.<\/td>\n<\/tr>\n
AMBIENT AIR<\/b><\/td>Often used as a term when referencing oxygen analyzer calibration. Ambient air consists of 20.9% oxygen which can be used as a known SPAN gas value.<\/td>\n<\/tr>\n
AMBIENT TEMPERATURE<\/b><\/td>The minimum \/ maximum temperature of air surrounding the device or equipment. A critical parameter when specifying an analyzer.<\/td>\n<\/tr>\n
ANALOG<\/b><\/td>A parameter which varies in a continuous, rather than incremental or discrete-step manner.<\/td>\n<\/tr>\n
CALIBRATE<\/b><\/td>To determine the indication or output of a device with respect to a standard.
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\n0 through 9, a 1\/2 digit will display a 0 or 1 and overrange at 2, a 3\/4 digit will display up to 3 and overrange at 4. A meter with a display span of \u00b13999 counts is a 33\/4 digit meter.<\/td>\n<\/tr>\n
EMI \/ RFI<\/b><\/td>Electromagnetic interference \/ Radio Frequency Interference. <\/td>\n<\/tr>\n
EXPANDED SCALE<\/b><\/td>AAn arrangement that expands a specific portion of an overall range to occupy a larger portion of the full-scale length than it normally would.<\/td>\n<\/tr>\n
EXPLOSION PROOF<\/b><\/td>An enclosure capable of withstanding an explosion of a specified gas or vapor which may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosures by sparks, flashes, heat or explosion of the gas vapor within.<\/td>\n<\/tr>\n
FORM<\/b><\/td>A method for specifying relay contact configuration: Form A SPST-NO single pole, single throw, normally open Form B SPST-NC single pole, single throw, normally closed Form C SPDT single pole, double throw Change-Over CO same as SPDT<\/td>\n<\/tr>\n
FULL SCALE VALUE<\/b><\/td>The arithmetic sum of the two end-scale values (may not apply to some specialized meters, such as power factor). When zero is not on the scale, the full-scale value is the higher end-scale value. Examples: Scale Full Scale Value 0-10 ppm, 0 \u2013 100ppm, 0 \u2013 500ppm, 0 \u2013 1000ppm, 0 \u2013 2500ppm, 0 \u2013 10000ppm, 0 \u2013 1%, 0 \u2013 5%, 0 \u2013 10%, 0 \u2013 25%<\/td>\n<\/tr>\n
GROUND<\/b><\/td>Reference point for an electrical system. Often used to indicate an earth connection or negative side of a DC supply.<\/td>\n<\/tr>\n
LINEARITY ERROR<\/b><\/td>A measure of the departure from a straight-line response in the relationship between two quantities, where the change in one quantity is directly proportional to a change in the other quantity. Usually expressed as a maximum percent.<\/td>\n<\/tr>\n
NEMA 4X \/ IP66 ENCLOSURE<\/b><\/td>A rating standard which defines intended use and degree of environmental protection. Typically associated with analyzers that will be installed outdoors.<\/td>\n<\/tr>\n
PPM (PARTS PER MILLION)<\/b><\/td>A convenient format to express very small numbers, such as temperature coefficients. 100ppm is 0.01%. PPM is also written as \u201ctrace\u201d as in trace oxygen.<\/td>\n<\/tr>\n
PSIA (PSI Absolute)<\/b><\/td>A pressure reading using vacuum as the reference.<\/td>\n<\/tr>\n
PSIG (PSI Gauge)<\/b><\/td>A pressure reading using ambient air pressure as the reference.<\/td>\n<\/tr>\n
RANGE<\/b><\/td>The span of values over which a meter will function without entering overload condition, e.g. 0-100ppm<\/td>\n<\/tr>\n
REPEATABILITY<\/b><\/td>The ability of an instrument to register the same reading in successive measurements of the same input.<\/td>\n<\/tr>\n
RESOLUTION<\/b><\/td>The degree to which nearly equal values of a quantity can be discriminated. In digital meters, the value represented by a one-digit change in the least-significant digit.<\/td>\n<\/tr>\n
SENSITIVITY<\/b><\/td>The minimum change in input to which a device can respond.<\/td>\n<\/tr>\n
SHIELD<\/b><\/td>A protective conductive covering that provides a least resistance path to ground for external interference.<\/td>\n<\/tr>\n
SPAN CAL ADJUSTMENT<\/b><\/td>The ability to adjust the gain of an instrument so the display value.<\/td>\n<\/tr>\n
T90 RESPONSE TIME<\/b><\/td>The time required for a sensor to respond to 90% of its total change resulting from a step input.<\/td>\n<\/tr>\n
TWO-WIRE TRANSMITTER<\/b><\/td>An instrument configuration in which the signal output and power input share two wires, power is transfer on one wire and returned to a PLC or DCS system via a 4 \u2013 20mA signal on the other wire. In most cases, this signal is non-isolated.<\/td>\n<\/tr>\n
ZERO CAL ADJUSTMENT<\/b><\/td>The ability to adjust an instrument so that zero output or zero display corresponds to a specific input signal, such as 0V or 4mA.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Home Also referred to as a vocabulary or definition of terms, we have put together some common terms that come up in reference to our precision O2 sensors.\u00a0 If you run across a term you are not familiar with, contact us.<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":""},"class_list":["post-420","page","type-page","status-publish","hentry"],"yoast_head":"\nGlossary of Oxygen & Industrial Gas Terms | SSO2<\/title>\n<meta name=\"description\" content=\"Comprehensive glossary of oxygen sensors, O\u2082 analyzers, and industrial gas terminology to help you understand key concepts and equipment for safe operations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sso2.com\/en\/glossary\/\" \/>\n<meta property=\"og:locale\" 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