ToxiRAE II (PGM-1120) Hydrogen Sulfide (H2S) Gas Detector

  • Hydrogen Sulfide (H2S)
  • Hydrogen Sulfide










      Hydrogen Sulfide resembles the
      faint odour of a rotten egg



    Standard Range

    •   Portable System - 0-50ppm
    •   Fixed System - 0-25ppm



    Maximum Overload




    Alarm Levels

    •   First - 5ppm
    •   Second - 10ppm
        (where applicable)
    •   Pre-Alarm - 5ppm
        (where applicable)




    •   Dirty waste water sites
    •   Petrochemical companies
    •   Offshore companies
    •   Tunnelling contractors
    •   Man entry applications
    •   Chemical companies
    •   Laborotries
    •   Mines




    Hydrogen sulphide has a maximum safe exposure limit of 10ppm, however high concentrations cannot be smelt and can lead to instant paralysis.  It is well known for its bad egg odour which can be smelt down to less than 0.1ppm.  It has almost the same density as air so detectors are mounted at head height or near potential sources of leaks. 

    For more information on Hydrogen Sulfide click here.


    *Maximum Exposure Levels - MELs are for the more dangerous substances and exposure to materials with MELs should be as low as possible, certainly not above their MEL. Occupational Exposure Standards - OESs for the less dangerous materials are the exposures which can be viewed as safe, and employees can work in them day after day.

  • Resolution 1
  • Range PPM 0 to 100
Product Code - 045-0511-000
Ex Vat £170.00
Inc Vat £204.00
in stockdelivery
  • Description
  • Key Features
  • Specifications

ToxiRAE II (PGM-1120) Hydrogen Sulfide (H2S) Gas Detector

The ToxiRAE II Hydrogen Sulfide (H2S) Monitor continuously displays toxic gas concentrations to the user and costs a little more than disposable detectors.  For H2S monitoring, typical disposables only display remaining life whereas the RAE’s detector is fully-featured and provides a continuous, digital display of the gas concentration, STEL, TWA and peak values as well as high and low alarms.  RAE System’s hydrogen sulfide detector is a simple-to-use one-button product and is easy to calibrate.  By using or modifying the alarms, specific requirements can be met. These include a bright red flashing alarm, a loud 90 dB buzzer and a built-in vibration alarm. 

To assist hydrogen sulfide monitoring, the instrument can be hands-free, clipping onto a hardhat, shirt pocket, shoulder strap, or belt.  The ToxiRAE II H2S gas detector is durable, highly-impact resistant and carbon-loaded with ABS casing.  

Once disposable monitors are turned on they stay on until their batteries expire, whereas the ToxiRAE II hydrogen sulfide detector allows the user to decide when and where the device is used and can be turned off accordingly. 

RAE System’s H2S gas detector does not have a pre-programmed expiration date so the user will get the full life out of the battery and sensor, which can both be easily replaced in the workplace.  Due to the cost of the ToxiRAE II being similar to many reduced-feature disposables, there is a choice to renew the monitor or obtain a fresh, new monitor.

This hydrogen sulfide monitor also comes with a 2 year guaranty, stainless steel alligator clip, wrist strap, calibration gas test adapter and a high-capacity Lithium battery.         

It can be used for H2S detection in fields such as oil production, chemical plants, fire service and power plants.

  • Large, easy-to-read continuous display of gas concentration in ppm
  • Displays STEL, TWA, and Peak values
  • Field replaceable filter and battery
  • Field replaceable sensor 
  • 2-Year warranty
  • User adjustable high, low, STEL, and TWA alarms
  • Varying audio alarm signals for different alarm conditions
  • Bright red flashing alarm
  • Loud 90 dB buzzer
  • Built-in vibration alarm
  • Holds Peak values
  • Simple calibration
  • Durable, highly impact-resistant, carbon loaded ABS housing
  • Highly resistant to RFI interference
  • IP-65 rated weather resistant
  • Stainless steel corrosion resistant attachments
  • Small enough to be clipped onto a hard-hat, shirt pocket, shoulder-strap, or belt
Range 0 to 100



3.6" x 1.9" x 0.9" (9.3 cm x 4.9 cm x 2.2 cm)

Weight 3.6 oz (102 g) with clip
  • User-replaceable 2/3 AA high-capacity
  • Lithium battery (use only RAE Systems batteries)
  • Extra battery included for use if maximum alarm minutes are exceeded.

Operating  Time

  • 2 years typical battery life for CO/H2S/O2 sensors or 730  minutes of alarm.


One-button operation
Direct Readout
  • Instantaneous display of toxic gas concentration in ppm (or oxygen in vol %)  STEL & TWA values
  • Peak hold
  • Alarm minutes consumed

Easy-to-read LCD for continuous display of concentration in ppm and text messages

  • Audible: 90dB at 10 cm
  • Visible: Bright red/green LED bar visible from top, front, and sides
  • Sensory: Built-in vibration alarm
  • High: Displays “High,” emits 3 beeps and flashes every 3 seconds
  • Low: Displays “Low,” 2 beeps and flash every 3 seconds
  • STEL: Displays “STEL,” 1 beep and flash every 3 seconds
  • TWA: Displays “TWA,” 1 beep and flash every 3 seconds
  • Low battery: Displays empty battery symbol, 1 beep per minute


Two-point field calibration; auto-zero at startup, user-initiated span/standard reference gas


-40° to 131° F (-40° to 55° C) for O2, CO, and H2S


0 to 95% relative humidity (non-condensing)


Highly resistant to EMI/RFI

Compliant With

EMC Directive 89/336/EEC

IP Rating

IP-65: protected against dust, protected against low-pressure jets of water from all directions

Hazardous Area Approval
  • UL/cUL Classified as Intrinsically Safe for use in Class I Division 1, Groups A, B, C, D
  • Hazardous Locations T5 rating (UL/cUL, ATEX)
  • ATEX, II 1G, EEx ia IIB T5, or II 2G, EEx ia IIC T5
  • CE Mark, European Conformity
  • IECEx Ex ia IICT4
Warranty 2-year warranty for instruments with CO/H2S/O2 sensors (all other sensors have 1-year warranty)
What’s Included
  • ToxiRAE II Detector with sensor as specified
  • Operation and maintenance manual
  • Rugged stainless steel alligator clip (installed)
  • Stainless steel belt clip / hardhat adapter
  • Wrist strap
  • Calibration gas test adapter
  • High capacity Lithium battery installed


Fixed Gas Detection
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