Model 420 & 425 Flame Photometer
425 91 001
Issue 22
1
st
December 2016
ECN 1410 & 1932
- 36 -
Description of Instrument
continued
5.1.1 Controls
continued
Blank
(A feedback beep confirms the action).
Forces the instrument to zero all channels.
Must be used at start-up and after a change of ‘Peak/Cont’, ‘Single/Dual’ or element
selection.
A short press may be used at any time during a measurement session to reset the
blank while aspirating the blank solution.
A long press at any time will reset to default settings and put the instrument into
start-up blanking mode and into Set-up mode.
Single/Dual and Element Selection
Used at start-up to choose ‘Single’ or ‘Dual’ channel operation.
Used to select particular elements by “toggling” through the sequence: -
The Model 420
The Model 425
“Na & K”
“Na & K”
“Na & Li”
“Na & Ca”
“Na”
“Na & Li”
“K”
“Ca & K”
‘Li’.
“Ca & Li”
“Na”
“Ca”
‘K’
“Li”
When in “Ref” Mode with Li Internal Standard, Li cannot be measured and will not be
selectable.
Peak/Ref/Cont
Used at start-up to choose the measurement mode, must be chosen before
Blanking.
‘Peak’ has the instrument sense when a steady reading has been achieved and
freeze that reading.
‘Ref’ uses signals from the Lithium channel as an internal reference. Can be used
with ‘Peak’ or ‘Cont’.
‘Cont’ displays readings in real-time.
Sequence is: -
“Peak & Ref” (Default Mode), “Cont”, “Cont & Ref”, “Peak”.
