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Portable Gas Detectors

FP-31 Interference Free Highly Accurate Formaldehyde Detector

Colorimetric Low Interference Formaldehyde Detector with internal pump

Formaldehyde (HCHO) Gas Detector

The FP-31 is a highly sensitive portable gas detector specific for formaldehyde (HCHO) detection. Unlike other Formaldehyde detection techniques that require pre-filter tubes for filtering out Phenols and other compounds, the FP-31 uses a specially doped colorimetric detection tabs with photoelectric photometry to provide a direct readout on the digital LCD display. Users place a tablet into the instrument, and then an air sample is pumped onto the tablet for either a 15 minute or 30 minutes. If HCHO 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 HCHO in the air. The stain darkness is read by an optical sensor in the Instrument. The FP-31 calculates the gas concentration from this.


Product Features

No interference Gases

Users read the HCHO measurement on an easy-to-read LCD display. The unit detects formaldehyde at very low levels. Users can easily confirm if an area contains safe breathing levels. In addition, the FP-31 has no known interfering gases.

The instrument has a self diagnosis function and is very easy to operate in addition to being very reliable. Users can also specify the optional tripod mounting in order to statically measure formaldehyde in a laboratory or mortuary. The Colorimetric tablets are readily available. In addition the unit comes fully calibrated and ready to use.

Detects the WHO Formaldehyde level:

The FP-31 replaces the popular FP-30 with ergonomic improvements including size, weight and an easy to read big LCD screen, and uses the same tabs.

The model FP-31 can detect the World Health Organization level of 0.08 ppm average for 30 minutes.

FP-31 Formaldehyde detector applications:

Users are Mortuaries, Teaching hospitals, universities, medical and veterinary laboratories as well as applications in furniture construction ,wood products and general air quality monitoring.


Model FP-31
Gas to be detected Formaldehyde (HCHO)
Detection Principle Photoelectric photometry method
Measurement range TAB 008: 0.000 – 0.400 ppm (“<0.01” is displayed for less than 0.015 ppm.)
TAB 009: 0.00 – 1.00 ppm (“<0.02” is displayed for less than 0.02 ppm.)
Measurement time TAB 008: 1800 seconds (30 minutes)
TAB 009: 900 seconds (15 minutes)
Fault alarm
Battery voltage low, Sensor failure, Poor pump connection, Detector system error, Abnormal temperature
Detection method Pump drawing type/Time accumulations measurement
Display method LCD digital display
Memory function Up to 99 detection points (Automatic recording after detection)
Use temperature/humidity range Operating temperature range: -10 – +40ºC
Operating humidity range: 90%RH or less (Non-condensing)
*The operating temperature and humidity ranges of each detection TAB are indicated on the detection TAB itself.
Power supply AA alkaline dry battery x 4
Continuous operating time About 12 hours (new dry batteries, without alarms or lighting, at 20ºC)
Outer dimensions Approx. 80 (W) x 150 (H) x 40 (D) mm (Only main unit excluding projections)
Weight About 250 g (without dry batteries)
Functions Data logger function, Clock function
*Specifications subject to change without notice.

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