NIR Snorkel Sampler for Gravity Drop and Air Conveyed Applications

Snorkel Sampler

Stainless Steel Snorkel Sampler Assembly

Certain applications require the NIR measurement of moisture or active ingredient in powdered, granular or flake material at a point where it is conveyed by gravity drop or air.  The lack of continuous flow and varying product density are not suitable for measurement through a sight glass.

The Snorkel Sampler collects product via a stainless steel tube terminating in a sample cup and viewing window.  The Snorkel Sampler is bolted to a spud attachment that is welded to the conveyor duct around a hole cut at the selected sample point and supported with a bracket.  This allows easy insertion and removal of the Snorkel Sampler for routine maintenance.

The user selectable measurement cycle allows for sample collection and measurement followed by an air purge blast to empty the sample cup.  The Snorkel Sampler also includes an adjustable delay cycle that holds the digital display, analog and digital outputs constant while the collection cup of the Snorkel Sampler refills for the next measurement cycle.


Snorkel Sampler Installed

NIR Snorkel Sampler Installed In-Line

Columnated Beam Assembly for Narrow Web and Web Edge Measurement

Columnated Beam Assemblies for Narrow Webs and Web Edge measurements are becoming an increasingly important tool for packaging material suppliers in the food, pharmaceutical and other industries.  Typically these applications require a much smaller spot size to avoid the irregularity on the body of the web which may contain intentional voids or reception spots for capsules, pills, vitamins etc.  In these cases there is usually a continuous band of hot melt coating on the narrow web edge for both lab and process measurements.

There are two common methods to narrow spot size.  Masking the light beam essentially blocks light energy into a smaller profile using less light and decreasing the signal to noise ratio.  Optical lens size reduction maintains energy and a strong signal to noise ratio.  Sometimes a combination of the two techniques are employed to best optimize spot size and shape for narrow webs.  Please contact Process Sensors to discuss your application at 508.473-9901.

Narrow Web comparison of optical to mask technique

Narrow Web Columnated Lens Assembly

Air Purge – When Do I Need One?

Air Purge Specifications

Process Near Infrared (NIR) analyzers benefit from an air purge in dusty environments.   The optical light tube is equipped with a 1/4″ brass Swagelock fitting for filtered or plant air.  Air flow is typically 3-5 psig to provide a laminar air flow that prevents dirt and dust from accumulating on the lens and reducing light energy return to the detector.  Higher air pressures create a turbulent flow that doesn’t protect the lens from dirt accumulation.  The picture below illustrates the difference that an air purge can make in a very dusty environment such as mines, concrete processing, or other environments where dust, or dirt is prevalent.

Please contact your Process Sensors representative at 508.473-9901 to discuss your application today.

Air Purge before and after

Benefit of Air Purge