by Fmeaddons

High Sensitivity Gas Monitor


  • PPB detection for ArsineAsH3 and Hydrogen Selenide H2Se
  • PPB or PPM digital display
  • Easily transportable
  • Panel mounting configuration available
  • Cassette tape remainder display included
  • Self-diagnostic functions
  • Two alarm levels
  • Interference – free detection
  • Ideal for detecting new ACGIH's TLV level for Arsine

Contact RKI Sales


RKI’s paper tape monitors utilize highly sensitive colorimetric tapes to achieve interference free detection at low PPB and PPM levels of a wide variety of gases. The FP-301 is equipped with an easily replaceable tape that is highly specific to Arsine AsH3 and Hydrogen Selenide H2Se. This model is equipped with a digital display showing the type of gas and concentration in ppb. The FP-301 will also display remaining tape life as well as an end of tape alarm.

The FP-301 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-301 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.



  • Detecting of uncaptured gas from scrubber
  • Environmental monitroing for semiconductor fabs




Detection principle

Photoelectric photometry method using tape cassette

Detection tape

Plug in cassette

Target Gas and Detection range

Arsine: 0-15 ppb

Hydrogen Selenium: 0-200 ppb

Sampling method

Internal sample drawing pump

Gas concentration display

Digital display by LCD

Alarm Indication

Warning and alarm with audible and visual indications

Alarm relay output

Common contact for each WARNING, ALARM and trouble, latched mode, rated 0.5A at 125VAC (resistive load)

Alarm display

Gas Alarm: Yellow warning light, Red alarm light and buzzer sound

Trouble Alarm: Flashing green light

Self diagnosis

Sensor failure, low flow, tape cut, tape end notice, tape end, tape set failure, system trouble

External output signal

4-20mA (300 Ω at maximum load resistance)

Operating temperature & humidity


30~90% RH (non condensing)

Power supply & power

24VDC +/- 10% for panel mounting
100 VAC-220VAC+/-10%, 50/60 Hz (desktop type)

Please specify the mounting type and power supply when ordering

Dimensions & weight

Panel mounting: Approx. 6.5″(W) x 6.5″(H) x 10.3″(D) Approx. 14.33lb

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


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Datasheet PDF