LCS Laboratory laboratory offers ready to use sampling kits for monitoring of of Isocyanates. The kit is designed in strict compliance with Industrial Hygiene practice and will deliver the highest quality results. In this article we explain how to assemble sampling train to collect volatile diisocyanates using OSHA 42 and 47 methods. For this project we will send you a portable air sampling pump calibrated at 1 L/min, tubing with attached cassette holder, and 37 mm cassettes designed to collect and preserve most common diisocyanates: HDI, TDI, IPDI and MDI.

37mm sampling cassette opening of a cassette

Start preparation by removing red and blue stoppers from the inlet and outlet side of the cassette. The picture on the left (above) shows inlet side of the cassette. Word “INLET” is embossed on the plastic. The bottom part of the cassette (outlet) has a “wagon wheel” pattern. Words “inlet” and “outlet” describe airflow direction through the sampling cassette, where air enters the cassette through the inlet port. Dust is collected by the filter inside the sampling cassette, and clean air is removed from the cassette via the outlet port. OSHA 42/47 methods require “open face” sampling where the inlet part of the cassette is completely removed. Use a coin or a screwdriver to gently pry off the inlet side of the cassette.

open face cassette Cassette holder

Remove the inlet. The inner part of the cassette is completely exposed. Take a cassette holder (upper right image) and locate round support plate.

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Take the cassette holder (left image) and place the cassette onto cassette holder with “open face” – open side of the cassette facing down. Feed the connector through the support plate of the holder and insert it into the OUTLET side of the cassette (image on the right). Your cassette assembly is ready.

connecting tubing to pump on switch

Connect free end of tubing to the pump. Now the entire sampling train is ready. Turn the pump on using the on/off switch on the front panel.

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Hang the pump on a worker’s belt, and clip the cassette holder in worker’s breathing zone. Note: open side of the cassette inlet is facing downward. You are ready to collect a sample.

Please contact us if you need air sampling equipment or laboratory testing of your samples.