System and method for cleaning in-process sensors

1. A cleaning system for an in-process sensor, comprising:

a. a reaction vessel containing a process fluid and having a sampling system connected thereto by way of a conduit for withdrawing at least a portion of the process fluid from the reaction vessel, and passing the process fluid through the sampling system and returning the process fluid to the reaction vessel;

b. a sensor, wherein the sensor has a surface, which surface is positioned such that it contacts the process fluid; and

c. a scouring jet having an inlet and an outlet, at least the outlet being positioned inside the sampling system;

wherein the process fluid is in contact with the inlet of the scouring jet and, wherein the jet is positioned relative to the sensor such that discharge from the outlet consists of the process fluid which impinges on the surface of the sensor.

2. The cleaning system of claim 1 further comprising one or more valves located between the inlet to the scouring jet and The outlet of The scouring jet.

3. The cleaning system of claim 1 wherein the sensor is an Infrared, Raman or Near Infrared spectroscopic instrument.

4. The cleaning system of claim 3 wherein the instrument has a probe.

5. The cleaning system of claim 4 wherein the probe has a window in contact with the process fluid.

6. The cleaning system of claim 1 wherein the sensor is an Infrared spectroscopic instrument.

7. The cleaning system of claim 1 wherein me sampling system comprises a recycle loop.

8. The cleaning system of claim 1 wherein the sampling system comprises an infrared analyzer cell.