Optical flow cell assembly incorporating a replaceable transparent flow cell
A new liquid flow cell assembly for light scattering measurements is disclosed which utilized a floating manifold system. The assembly operates with minimal stacked tolerances by aligning the cell to the windows within a manifold and independently aligning the cell to the read head directly. This configuration enables the ability to replace the flow cell or the flow cell/manifold assembly within a light scattering instrument without the need to realign the flow through elements with the light scattering illumination source while still maintaining reproducible, quality data. Some embodiments employ wide bore cells which enable the measurement of process analytic technology (PAT) including online monitoring of reactions.
1. An optical flow cell assembly comprising:
a transparent flow cell comprising a measurement channel;
a read head to contain the flow cell comprising
an outlet port sealed with an outlet o-ring to the channel,
a beam generating light source aligned to emit a beam of light along an axis of the read head;
an inlet port assembly to apply downward pressure onto the flow cell,
wherein the inlet port assembly comprises an inlet port coupled with an inlet o-ring to the inlet port assembly,
wherein the downward pressure causes the o-rings to seal; and
wherein the read head is to be directly registered to the flow cell, thereby aligning the flow cell to the read head,
wherein the read head further comprises
a read head cavity comprising vertical flat faces to contact vertical surfaces of the flow cell, and
at least one ball plunger to drive the vertical surfaces of the flow cell into contact with the vertical flat faces of the read head cavity.
2. The optical flow cell assembly of claim 1
wherein the inlet port assembly comprises an inlet path coupled to an outlet of the inlet port, and
wherein an inlet of the outlet port is coupled to an outlet path,
wherein the inlet path and the outlet path are to direct a flow of a liquid sample from the inlet port through the flow cell and out of the outlet port.
3. The optical flow cell assembly of claim 1
wherein the vertical flat faces of the read head cavity comprise two vertical flat faces,
wherein the vertical surfaces of the flow cell comprise two vertical surfaces, and
wherein the at least one ball plunger comprises two ball plungers to drive the two vertical surfaces of the flow cell into contact with the two vertical flat faces of the read head cavity.
4. The optical flow cell assembly of claim 3 wherein each of the two ball plungers are placed opposite from a respective vertical flat face among the two vertical flat faces.
5. The optical flow cell assembly of claim 4 wherein the each of the two ball plungers are placed 45 degrees from the axis.
6. The optical flow cell assembly of claim 3 wherein the beam generating light source is placed within a V shaped section of the read head cavity,
wherein the V shaped section is defined by the two vertical flat faces.
7. A method comprising:
containing an optical flow cell comprising a measurement channel within a read head such that the optical flow cell is aligned to the read head; and
registering directly the flow cell to the read head with at least an inlet port assembly to apply downward pressure onto the flow cell,
wherein the inlet port assembly comprises an inlet port coupled with an inlet o-ring to the inlet port assembly, thereby aligning the flow cell to the read head,
wherein the read head comprises
an outlet port sealed with an outlet o-ring to the channel,
a beam generating light source aligned to emit a beam of light along an axis of the read head,
a read head cavity comprising vertical flat faces configured to contact vertical surfaces of the flow cell, and
at least one ball plunger to drive the vertical surfaces of the flow cell into contact with the vertical flat faces of the read head cavity,
wherein the downward pressure causes the o-rings to seal.
8. The method of claim 7
wherein the inlet port assembly comprises an inlet path coupled to an outlet of the inlet port,
wherein an inlet of the outlet port is coupled to an outlet path, and
wherein the inlet path and the outlet path are to direct a flow of a liquid sample from the inlet port through the flow cell and out of the outlet port.
9. The method of claim 7
wherein the vertical flat faces of the read head cavity comprise two vertical flat faces,
wherein the vertical surfaces of the flow cell comprise two vertical surfaces, and
wherein the at least one ball plunger comprises two ball plungers to drive the two vertical surfaces of the flow cell into contact with the two vertical flat faces of the read head cavity.
10. The method of claim 9 wherein each of the two ball plungers are placed opposite from a respective vertical flat face among the two vertical flat faces.
11. The method of claim 10 wherein the each of the two ball plungers are placed 45 degrees from the axis.
12. The method of claim 9 wherein the beam generating light source is placed within a V shaped section of the read head cavity,
wherein the V shaped section is defined by the two vertical flat faces.