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Fixed Gas Detection

FP-330 Interference Free Formaldehyde Monitor

Interference Free Highly Accurate Fixed Formaldehyde Detector

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.

Product Features

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. FP 330



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

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