FP 31
Formaldehyde Gas Detector


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    • Description
    • Features
    • Applications
    • Specifications
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    The FP-31 is a highly sensitive portable gas detector specific for formaldehyde detection. It uses a photoelectric photometry method which utilizes 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 very low levels of formaldehyde, in order to confirm if an area contains safe breathing levels. There are no known interfering gases, as shown on the chart on the reverse side of this sheet.

    • Built-in sample draw pump
    • Photoelectric photometry technology
    • Direct digital readout
    • Colorimetric detection tablet method
    • No false readings from interfering gases
    • Operates on 4 AA
    • Stores 99 readings
    • No warm up time
      • Furniture and woodworking
      • Coating and varnishing
      • Engineered wood products
      • Medical / veterinary
      • Painting & corrosion resistant finishes
      • Carpet manufacture & storage
      • Adhesives
      • Heat treatment operations
      • RV / trailer / mobil home inspecting

      Detection Ranges

      30 minute sample 0 – 0.4 ppm (0.005 ppm/digit)
      15 minute sample 0 – 1.0 ppm (0.01 ppm/digit)

    Detection gasFormaldeyde (HCHO) in air
    Detection range0-0.4 ppm (0.005ppm/digit)0-1.0 ppm
    (0.01 ppm/digit)
    Detection time30 minutes (1,800 sec.)15 minutes (900 sec.)
    Detection principlePhotoelectric photometry method
    Detection methodColorimetric tablet method (accumulating measurement)
    Accuracy± 10% of reading or ± 5% of full scale (which ever is greater)
    DisplayDigital LCD
    Sampling methodSample drawing with built-in pump
    Operating conditions-10 ~ 40ºC (14 ~ 104ºF), below 90%RH
    MemoryUp to 99 readings (automatic recording at the completion of measurement)
    Self-diagnosisFailure of light source and light receiver, low battery voltage, pump failure, system trouble
    Power SourceAA size Alkaline batteries (quantity 4)
    Continuous OperationApproximately 12 hours (with no alarm or backlight, with alkaline batteries at 20°C)
    DimensionApprox 85(W) x 190(H) x 40(D)mm, 3.35(W) x 7.48(H) x 1.57(W),
    Weight500g, 17.6 oz
    Standard Accessories• Detection TAB (20 pcs/pack) ** • Carrying case • AA size alkaline batteries • Operating manual
    Optional AccessoriesZero and span tab, datalogging software, USB-IRdA cable (for downloading stored data)
    WarrantyOne year material and workmanship

    Interference against other gases (typical)
    Test GasConcentrationReading
    Toluene1.0 vol.%0 ppm
    Benzene1.0 vol.%0 ppm
    Acetoaldehyde100 ppm0 ppm
    Carbon monoxide50 ppm0 ppm
    Carbon dioxide1.0 vol.%0 ppm
    Ammonia25 ppm0 ppm
    Acetone1.0 vol.%0 ppm

    Field Test Verification Data
    Measurement PlaceFP-31DNPH method*
    Interior0.020 ppm0.025 ppm
    Locker0.030 ppm0.03 ppm
    Furniture0.040 ppm0.05 ppm

    * Dinitrophenylhydrazine detection method

    ** Please note: Detection tabs have a six month shelf life. They must be stored in a referigerator (37°F – 50°F, 3-10°C)

    Specifications subject to change without notice.