Learn more about the FP-301 Arsine AsH3 and Hydrogen Selenide H2Se Detector, FP301 provided by RKI Instruments.

FP-301 Arsine AsH3 and Hydrogen Selenide H2Se Detector

High Sensitivity Gas Monitor

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
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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. FP 301



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


Model FP-301
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 41-95°F 5~35°C30~90% 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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