Instruction Manual: EMP-3
NIC-TD-0000067-01
Nippon Instruments Corporation
25
4.5.3.4 CHECKING OF DRIFT AND INTERFERING COMPONENTS
About Drift
Drift occurs when the optical system becomes unstable, such as immediately after the start
of measurement or sudden temperature change occurs.
As the baseline changes, even if mercury isn’t detected, the displayed value gradually
increase or decreases.
Drift is eliminated by the ZERO check.
About Interfering Components
If any interfering component is contained in gas to be measured, a measurement value may
change because of interference. It is impossible to obtain the correct measurement value
unless the influence of interfering components is eliminated.
If the concentrations of interfering components do not change in the one cycle of a
measurement, interference is eliminated by the ZERO check.
However, if the concentration of any interfering component changes rapidly in the one cycle
of a measurement, the displayed value of the mercury concentration may become an
abnormal value because of interference by the interfering component.
Procedure for Checking of Drift and Presence/Absence of Interfering Components
When a judgment on changes of the concentrations about drift or interfering components is
difficult, make a check according to the following procedure.
(1)
Press “Sample”. The display is switched to “Filter”.
