FP 330
High Sensitivity Formaldehyde Gas Monitor

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  • Description
  • Features
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  • Specifications
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RKI’s paper tape monitors utilize highly sensitive colorimetric tapes to achieve interference free gas detection. The FP-330 is equipped with an easily replaceable tape that is highly specific to Formaldehyde. This model is equipped with a digital display showing the type of gas and concentration in PPM. The FP-330 will also display remaining tape life as well as an end of tape alarm.

The FP-330 has audible and visual alarms, as well as alarm relay contacts and 4-20mA output. A unique “Tape Saver mode” extends tape life in applications where high background gas levels may be present.

The FP-330 meets and exceeds OSHA and NIOSH compliance requirements, and does not respond to interfering gases (hydrocarbons, alcohols, solvents, CO, etc.) that may be present in industrial/manufacturing environments.

  • Small and compact
  • Highly sensitive and ideal for low level formaldehyde concentrations
  • Interference-free detection
  • Easy detection tape replacement with plug-in cassette
  • Tape remainder display and tape end warning alarm provided
  • PPM digital display
  • Easily transportable
  • 115 VAC powered
  • Alarm relays
  • 4-20mA output
  • Furniture and woodworking
  • Coating and varnishing
  • Engineered wood products
  • Medical / veterinary
  • Painting & corrosion resistant finishes
  • Carpet manufacture & storage
  • Adhesives
  • Heat treatment operations
  • Manufactured homes/trailer/RV inspection


FP-330 HCHO 0 – 0.500 ppm

FP-330 HCHO 0 – 1.00 ppm

FP-330 HCHO 0 – 5.00 ppm


Photoelectric photometry method using tape cassette

Detection tape

Plug in cassette, 65-FCL-018

Detection gas

Formaldehyde (HCHO)

Detection range

0.030 to 
0.500 ppm

0.05 to 
1.00 ppm

0.3 to 
5.00 ppm

Alarm point

1st 0.080ppm
2nd 0.300ppm

1st 0.17ppm
2nd 0.33ppm

1st 0.8ppm
2nd 1.7ppm


Latching alarm (standard) or non-latching (option)
Lamp: Caution = Yellow 
Alarm = Red, with buzzer


0.030 ppm

0.05 ppm

0.3 ppm

Measuring cycle

1800 sec.
(30 minutes)

600 seconds 
(10 minutes)

180 seconds 
(3 minutes)



0.01 ppm

0.1 ppm

Flow rate

450ml/min. (nominal)

Max. tubing 

2m (teflon only)


+/-20% of indication value + 1 digit

Tape operation time

1 month with no background gas. (see note below)

Alarm Indication

Warning and alarm with audible and visual indications


Low flow, tape cut, sensor failure, etc.

External output signal

4-20mA (load resistance: below 300Ω)

Operating temperature & humidity

5~35°C 20~60% RH (non condensing)

Gas inlet/outlet

OD 6mm with fittings

Power supply & power

100VAC to 220VAC universal power,

Dimensions & weight

Approx. 6.5″(W) x 7.8″(H) x 10.4″(D) 
Approx. 12.125lb

164 (W) x 198 (H) x 263 (D) mm, 6.5kg 

When HCHO exists in the background continuously over 0.03 ppm, the tape on FP-330 advances after every measurement, so the tape is consumed very quickly. In this case, to extend operating time, the Tape Saver mode is provided on the FP-330.

Tape Saver mode is available for all three ranges;
0H: Normal operation.
1H: One measurement during one hour. Tape lasts 15 days with constant background level.
2H: One measurement during two hours. Tape lasts 30 days with constant background level.

Specifications subject to change without notice