Xylem YSI Alyza IQ NH4, Руководство по эксплуатации

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Alyza IQ NH4 Appendix
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9 Appendix
9.1 Glossary
Absorbance Logarithmic measure for the absorption of the sample; negative decadic
logarithm of the transmission.
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or a val-
ue that is regarded as correct, or that the difference remains within the tol-
erance.
Blank value The blank value is the measured value of a measuring system if the mea-
sured parameter has the value zero or is nonexistent. The blank value has
to be determined and subtracted from the measured values of the actual
samples.
Calibration Comparing the value from a measuring system (e. g. the displayed value)
to the correct value or a value that is regarded as correct. Often, this ex-
pression is also used when the measuring system is adjusted at the same
time. See «Adjusting».
Citation forms Different display formats that can be derived from each other of the mea-
sured value for a concentration. The method for determining ammonium
provides, for example, a measured value for nitrogen N. This measured
value can be cited with the citation forms NH4, NH4-N or NH3-N.
Concentration Mass or amount of a dissolved substance per volume, e. g. in g/L or mol/L.
Deionized water Water that was freed of minerals with the aid of an ion exchanger. Deion-
ized water may still contain uncharged contamination such as organic
compounds. It is also called DI water.
Firmware The software permanently assigned to an instrument.
Ground fault circuit
interrupter
Earth leakage circuit breaker. An electrical assembly group that switches
off a circuit as soon as the strength of current in the phases does not ex-
actly agree with the strength of current in the neutral conductor. The cur-
rent difference can be caused by a grounded person inadvertently
touching a live part of the circuit.
LED Light emitting diode
Measured
parameter
The measured parameter is the physical dimension determined by mea-
suring, e. g. pH, conductivity or D.O. concentration.
Measured value The special value to be determined of a measured parameter. It is given
as a combination of the numerical value and unit (e. g. 3 m; 0.5 s; 5.2 A;
373.15 K).
Measuring system A measuring system comprises all the devices used for measuring, e. g.
meter and sensor. In addition, there is the cable and possibly an amplifier,
terminal box and armature.