H2S Single Gas Detector | RKI

H2S Single Gas Detector

H2S Gas Detector

HS-04 Single Gas Detector


  • Not designed to stop working
  • Continuously operate for over one year
  • Field serviceable
  • Pocket size 2.1”(W) x 2.6”(H) x 0.9”(D), 2.8 ounces
  • Impact, dust, and water resistant (IP-67)
  • Replaceable rubber boot
  • Alligator clip with 360° rotation
  • Audible / visual / vibration alarms
  • Automatic backlight
  • Intrinsically safe, ATEX and C / US approvals
  • 3 Year warranty*
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The HS-04 single gas monitor is designed to operate for many years with field replaceable sensors and filters. The HS-04 can be operated continuously for up to 9,000 hours on (2) AAA size alkaline batteries. The HS-04 has 3 preset alarms that are user adjustable. Also equipped with visual, audible, and vibration alarms as standard.

The replacement sensors are inexpensive, easily field replaceable, and are interchangeable with other popular RKI instruments like the GX-3R, GX-3R Pro, and GasWatch 3. Sensors have a life expectancy of over 3 years and are backed by a 3 year warranty.*

The HS-04 monitor is impact, dust, and water resistant with an IP-67 ingress protection rating. HS-04 instruments are safe for use in hazardous locations, classified as intrinsically safe ATEX/IECEx and by QPS to U.S. and Canadian standards for Class I, Division 1, Groups A, B, C, and D atmospheres.

* 3 year warranty on material and workmanship including sensors


  • Hazardous material
  • Mining
  • Refineries / petrochemical
  • Water / wastewater treatment
  • Pharmaceuticals
  • Utilities
  • Chemical plants
  • Fire services


Gases & Detectable Ranges
Gas Part #
Detection Range

Set Points

Continuous Operation
Hydrogen Sulfide


0 – 200.0 ppm
(0.1 ppm)
A1: 5 ppm 9,000 hours
A2: 30.0 ppm
A3: 100.0 ppm
TWA 1.0 ppm
STEL 5.0 ppm
Common Specifications
Sample Method Diffusion
Response Time T90 in 30 seconds
Alarm Types Gas alarm Trouble alarm
1st, 2nd, and 3rd
(user adjustable),
OVER alarm, STEL, and
Sensor connection,
low battery,
circuit failure,and calibration range error
Alarm Methods Gas Alarm Trouble Alarm STEL / TWA
Flashing LED’s, intermittent buzzer, flashing gas value, and vibration Flashing LED’s, intermittent buzzer, and display of error message Flashing LED’s, intermittent buzzer, flashing gas value, and vibration
Datalogging 10 sec. intervals = 10 hrs. 5 min. intervals = 300hrs,
10 min. intervals = 600 hours
Instrument records alarms, alarm trends, gas readings, calibration & bump test history, instrument settings
Battery Options Alkaline dry cell (2-AAA size)
Display Digital LCD, gas name & concentration, auto backlighting during alarm, operation icon, battery icon
Operating Temp.
& Humidity
-4°F to 122°F (-20°C ~ +50℃), 0- 90% RH non condensing
Dimensions 2.1” W x 2.64” H x 0.94” D (54 x 67 x 24 mm)
2.8 ounce (80g)
Enclosure Dust and water resistant with IP-67 rating
Safety Rating ATEX/IECEx approved. QPS classified, “C / US”, as intrinsically safe, Class I, Division 1, Groups A, B, C, D
• Rubber boot • Datalogging software
• Alligator clip • Alkaline batteries
• Calibration cap

• Wrist strap

• Calibration kit

• Belt clip

• Datalogging download cable

Special Functions Manual backlight for LCD (automatically lit during alarm), Peak hold, STEL & TWA
Warranty 3 year warranty (1 year for Ammonia and Chlorine)
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