PerkinElmer aanalyst 200 User Manual page 75

Electrodeless Discharge Lamps (EDL System II)
While hollow cathode lamps are an ideal source for determining most elements by atomic
absorption, for volatile elements, an electrodeless discharge lamp (EDL) is recommended instead.
EDLs provide greater light output for improved detection limits and precision, along with
increased sensitivity and working curve linearity. EDLs also have a longer life than
corresponding hollow cathode lamps. For certain elements (such as arsenic and selenium), EDLs
will also provide improved sensitivity.
Lamp Driver
Locking Pin
Figure 4- 6 An Electrodeless Discharge Lamp (EDL).
An EDL consists of a quartz bulb under an inert gas atmosphere, containing the element or a salt
of the element for which the lamp is to be used. When an RF field is applied to the bulb, the inert
gas is ionized and the coupled energy excites the vaporized analyte atoms inside the bulb, causing
them to emit their characteristic spectrum. The emission spectra produced is typically much more
intense than that from hollow cathode lamps, frequently tenfold larger or more.
Lamp Installation
When you first receive your instrument, there is no lamp source installed. For initial lamp
installation details see, Chapter 6, Operation of the Instrument in this manual. If you need to
replace an existing lamp see, Chapter 9, Maintenance later in this manual contains the various
lamp replacement procedures.
Lamp Sleeve
Note: This cable connects to the
"Lamp1" or "Lamp2" receptacle
on the back of the EDL Power Supply.
Note:
This coding plug is not
used with the AAnalyst
Instruments.
AAnalyst 200 User's Guide
Note:
Use this coding plug
with the AAnalyst
Instruments.
4-9