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Optional glass capillary sprayer 4-9
Optional glass capillary sprayer
The glass capillary sprayer is designed for use with metal-coated borosilicate
glass capillaries. They allow extremely low flow rates (less than 100 nL/min).
The glass capillaries are used for one sample only and must then be discarded.
To use the glass capillary sprayer, complete the following procedures:
• Plumb the backpressure gas.
• Install the glass capillary sprayer.
• Fit and load the glass capillary.
• Optimize the sprayer.
Plumbing the backpressure gas
The electronic pressure controller can control pressure only when gas is
flowing. However, the glass capillary requires a backpressure without a flow.
To resolve this situation, the backpressure gas is plumbed from the source to
the glass capillary sprayer through an in-line tee-piece. The tee-piece permits
the gas flow to bleed to atmosphere while the selected pressure is maintained
at the back of the capillary.
Required materials
• Chemical-resistant, powder-free gloves
• Glass capillary option spares kit, which includes these items:
–
PTFE tubing, 1/16-inch OD, 0.006-inch ID, 530 mm
– PTFE tubing, 1/16-inch OD, 0.023-inch ID, 120 mm
– Tee piece and nuts, 1/16-inch “finger-tight”, 0.5-mm bore
– SealTight™ nut and ferrule
• Sharp knife or PEEK tubing cutter
To plumb the backpressure gas:
1. Use the sharp knife or PEEK tubing cutter to cut a 30-mm length from
the 0.006-inch ID PTFE tubing to leave a 500-mm length, and retain
both pieces.