Teflon Process Flow Cell

Highly Efficient and Reliable Measurements

Our GUIDED WAVE™ Teflon Process Flow Cell was developed for sample streams that are either extremely corrosive or intolerant to metal contamination. None of the cell’s wetted parts are constructed of metal. Only smooth Teflon and sapphire surfaces contact the process stream. Otherwise, the Teflon Process Flow Cell utilizes the same optical components as our popular Multi-Purpose Metal Flow Cell. Corrosion resistant stainless steel is used in the outer cell construction to maintain a rigid, stable optical path length. Hence, it has the same high optical efficiency. Plus, it is guaranteed not to leak! The GUIDED WAVE PFA/PEEK Flow Cell was developed for environments that must be completely metal-free.

Teflon not only “cold flows” but has a very large temperature coefficient of expansion. To maintain the all-important pathlength, stainless steel rods are embedded in the Teflon body. The windows and other precision optics are held rigidly in place by these rods. Thus, preventing even the slightest change to the critical pathlength during the normal expansion and contraction that naturally occurs with Teflon products. The measurement accuracy of the stream is therefore never compromised due to this or any other phenomena. If necessary, the cell can be completely disassembled for inspection or deep cleaning. The reassemble step is easily accomplished without changing the critical pathlength. For your convenience, the Teflon Flow Cell is equipped with a clean-out port that provides access to the windows for cleaning without disconnecting fibers or plumbing.

Process-Resistant Flow Cell Body Construction

Since no metal parts come in contact with the liquid stream, the design is ideal for processes where even parts per billion levels of metals contamination can create serious problems as in semiconductor fab etching and cleaning steps. The cell also performs well in the presence of extremely corrosive streams containing strong acids, bases, peroxides or halogenated compounds.

Operating Range

The GUIDED WAVE Teflon Process Flow Cell operates at moderate temperatures and pressures. Specifically, safe upper limits for deployment are:
• Temperatures to 150 °C
• Pressures to 100 psi

Available in four standard pathlengths 2, 5, 10 and 20 mm, but other custom paths are available by special order.

Common Integration with Most Spectrometers

The GUIDED WAVE Teflon Process Flow Cell is manufactured to facilitate full integration with any fiber optic system configured with SMA 905 connectors. Connecting the Teflon flow cell with fibers having a core diameter of 400 to 600 micron to the NIR analyzer will provide the best optical performance. The Teflon flow cell is compatible with FT-NIR analyzers from other vendors.

Exceptional Light Transmission

Like our other GUIDED WAVE optical probes, the Teflon Process Flow Cell provides exceptional optical performance. Typical peak transmission exceeds 50%. That means more signal, lower measurement noise and lower detection limits. The flow cell can be completely dismantled, then reassembled without changing the sampling pathlength, an important feature when working with established NIR calibration models.

Compatible with All of Our GUIDED WAVE Analyzers

The sample interface is a crucial component of a complete fiber optic-based analyzer system. For optimal performance, the probe must be ‘’optically matched’’ with both the spectrometer and the fiber optic cable. The Teflon Process Flow Cell, just as is the case for all our Guided Wave probes, provides consistently high performance when used in combination with our analyzers and fiber.

Product Name	Teflon PFA/PEEK Flow Cell
Optical Pathlength	2; 5; 10; 20 mm
Spectral Range	UV-VIS (200 – 600 nm); NIR (600- 2100 nm)
Fiber Connector	SMA 905
Optical Efficiency	>45% transmission from 800 – 1650 nm (%T)
Temperature Range	0 to 150 °C (O-ring material dependent)
Pressure Range	0 to 100 psi [690 kPa]
Body Material	Teflon
O-Ring Material	Kalrez® 6375 UP (wetted only)
Process Connections	3/8 or 1/2 inch FNPT (pathlength dependent)