Ocean Optics S2000 - Manual (Page 70)

LPC Long Pass Flow Cells
LPC L ONG P ASS F LOW C ELLS from Ocean Optics couple to the company's high-sensitivity fiber optic
spectrometers and compact light sources via SMA terminations for simple, efficient measurement of low-volume
or low-concentration (ppb-ppt) aqueous samples. LPC Long Pass Flow Cells are available in 1-meter, 5-meter and
10-meter path lengths for absorbance measurements. The Flow Cells will function with most liquids (except for
perfluorinated solvents) having a refractive index >1.30.
Caution!
Do not use perfluorinated solvents with the LPC because the amorphous fluoropolymer tubing is soluble in
these chemicals.
LPC Flow Cells will function with most liquids (except for perfluorinated solvents) having a refractive
index >1.30.
! !
Ensure the plumbing fittings through the front panel are tight and free of leaks.
! !
Minimize the injection of bubbles into the LPC since they will cause erratic results. Continuous pumping will
typically flush the bubbles through the system.
! !
At the end of each experimental session, flush the system with solvent and then pump dry. Avoid leaving fluid
in the LPC for extended periods of time.
! !
DO NOT exceed a fluid pressure of 45 psi.
Operation
Using the Plumbing Connections
On the front panel, there are two plumbing feed-through ports. It does not matter which one is used for the
plumbing input or the plumbing output. However, for experimental consistency, once you have assigned which
fitting will be the plumbing input and which one will be the plumbing output, try not to switch the plumbing
configuration. The tubing goes over the plumbing fittings, which are standard ¼-28 threads. The tubing should fit
snugly over the fittings and be free of leaks.
1.
Attach one end of the tubing to your pump. The pump used must not pump the solution so fast that the fluid
pressure exceeds 45psi. Remember to always turn off the pump in between taking a reference and taking
sample measurements.
2. Make sure you have a proper waste receptacle for the other end of the tubing.
The plumbing connections inside the LPC are standard industry fittings. No maintenance should be required.
However, if leaks develop, the plumbing connections will need to be tightened. To tighten the connections, simply
follow these steps:
1.
Remove the back panel.
2. Carefully slide off the top cover, being careful not to damage or pinch the tubing or fiber.
3. Hand-tighten the fittings and reassemble the cover and back panel.
Installing Fibers
On the front panel, there are two fiber feed-through ports. It does not matter which one is used for the fiber input
or the fiber output. However, for experimental consistency, once you have assigned which fiber port will be the
input and which one will be the output, try not to switch the fiber configuration. The fiber inside the LPC has a
core diameter of 200
µ
m. External coupling fibers should be 200
µ
m or larger for maximum coupling efficiency.
1. Attach one end of an illumination fiber to a port on the LPC and the other end to your light source.
2. Attach one end of a read fiber to the second port on the LPC and the other end to your spectrometer.
Sampling Chambers: LPC
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