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4
Using the Module
Instrument Controls
Status Mode
The ELS Detector can be operated in two modes; STANDBY or RUN, both of which
are described over page:
To display the current mode and/or select a new mode, highlight the MODE
function on the instrument display. The current mode will now be displayed on
the screen. Using the arrow keys, scroll up or down until the desired option is
displayed. The instrument acknowledges the command by displaying the mode
of operation in the top-right corner of the screen.
Standby
The STANDBY mode is the "ground state" of the ELS detector, which is by default
selected automatically after power-on (default can be changed using Power
Mode,
source are switched off, and the gas manifold valve is closed at power-on. The
STANDBY mode gives the user a control platform in which to set up the
operational parameters (gas flow, nebulizer, and evaporator temperatures)
before switching the unit into RUN mode. The instrument will default to STANDBY
mode should an error occur on the instrument.
Following a command or error, the instrument is switched from RUN to STANDBY
mode. In this situation, the gas management system is invoked and the gas flow
set to a minimum flow of 1.2 SLM for 15 min before the gas manifold valve is
closed. This minimum "blanket" gas is STANDBY enough to nebulize and
evacuate solvent should the instrument default to STANDBY mode with solvent
still flowing.
Flooding the detector
C AU T I O N
If the instrument is left in STANDBY mode for longer than 15 min, gas flow to
the unit is stopped to minimize gas usage.
The solvent pump must be turned off if the ELSD is going to be left in
STANDBY mode longer than 15 min to prevent solvent flooding the detector.
RUN
The RUN mode is the detector's operational mode. In this mode, the instrument is
controlled at the set temperatures and gas flow, and the system is fully
operational. During heating or cooling the instrument will display NOT READY to
show that the system has not reached the set conditions. When the instrument
has equilibrated, READY will be displayed and the instrument is ready for use.
Agilent InfinityLab ELSD User Manual
"Power Mode"
on page 50). In STANDBY mode the heaters and light
46
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