The RKI FP-330 is a continuous paper-tape monitor built specifically for formaldehyde, using photoelectric photometry against a dedicated plug-in chemcassette tape. It's available in three range/cycle configurations — 0-0.5 ppm (30-minute cycle), 0-1.0 ppm (10-minute cycle), or 0-5.0 ppm (3-minute cycle) — each with its own resolution and alarm setpoints tuned to the application.

Latching or non-latching alarms drive yellow and red lamps plus an audible buzzer, alongside a 4-20mA output for building or process integration. Running on universal 100-220VAC power, the FP-330 is built for continuous formaldehyde monitoring in furniture and engineered wood manufacturing, coatings and varnishing operations, and medical or veterinary facilities.