FP-31 Formaldehyde Gas Detector

The Riken Keiki FP-31 is a highly sensitive portable gas detector specific for formaldehyde detection. It uses a photoelectric photometry method which utilises colorimetric tablets for detection. A tablet in placed into the instrument, and then a room air sample is pumped onto the tablet for either a 15 minute or a 30 minute period. If formaldehyde is present, it will cause the chemically impregnated tablet surface to darken or stain. The magnitude of the stain directly correlates to the level of formaldehyde in the air. The stain darkness is read by an optical sensor in the FP-31, and then the instrument calculates the formaldehyde concentration. The FP-31 then has a direct readout of the formaldehyde measurement on an easy to read LCD display. The unit is capable of detecting deficient levels of formaldehyde, to confirm if an area contains safe breathing levels.


TypeSingle gas
Target gasFormaldehyde (HCHO)
Detection principlePhotoelectric photometry
Power sourceAA alkaline battery x 4pcs
Continuous operationApprox. 12 hours
Dimensions & Weight80(W) x 150(H) x 40(D) mm, Approx. 250g
Operating temperature & Humidity-20 to 50℃, Below 95%RH


Sebastian Kelderman