S
YSTEM
D
ESCRIPTION
ProStar 340 UV/Vis Detector
15
Lamp
The Lamp connection turns the lamp off when supplied with a
constant contact closure or TTL low.
Connect the triggering device so that the positive (+) line is
connected to the positive pole and the negative (–) line is
connected to the negative pole of the Remote Lamp terminal.
The Remote Lamp shut-off is triggered by shunting across its
two input terminals. Interruption of this shunt re-ignites the lamp.
NOTE:
If the lamp is switched off by the Remote Lamp Shutoff and then re-
ignited, the fixed zero volt recorder output function indicated by the front
panel Wait LED will not be maintained. The recorder output will return to
a level representative of the current absorbance and last-stored zero
value. The Autozero circuit should be activated.
Fluid Connections
The detector fluid inlet is the lower tube protruding from the rear
wall of the cell compartment (see Figure 5). As a general rule,
the less tubing between the column outlet and the flowcell, the
better. Ideally, the column outlet should be connected directly to
the detector inlet line. If this is not possible, you should use a
minimum length of narrow bore (0.010 inch ID) connecting tubing
and a zero dead volume union.
Because different columns use different fittings, the detector is
supplied with a bare tube end to allow connection to any column
accepting 1/16 inch OD tubing. You should use nuts and ferrules
suitable to your column.
Connect the cell outlet (the upper tube protruding from the rear
wall of the cell compartment) to a line leading to an appropriate
waste reservoir. If bubble formation in the detector cell causes
problems, you may wish to connect the cell outlet to a restrictor
or back pressure device providing 20-60 psi backpressure.
NOTE:
Before connecting a new piece of tubing or column to the detector, pump
several mL of clean solvent through it to waste. This action will clean any
particulates or oil from the inside bore of the tubing, which would
otherwise reach the sample cell or heat exchanger.
Summary of Contents for ProStar 340
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