Hydrogen Sulfide (H2S) Single Gas Detector

Keeping Workers from Toxic Industrial Gases

Industrial sites in the Oil & Gas, Petrochemical and Offshore sectors can be volatile places if the right safety measures are not in place. You need reliable and ATEX certified gas detectors to keep the workforce safe.

Hydrogen Sulfide (H2S) may desensitise and render the body unconscious in no time at high concentrations, therefore, reliable personal monitoring equipment is crucial.

ARA H2S portable alarm is a low cost, wearable clip monitor for the detection of dangerous levels of Hydrogen Sulfide (H2S). The detector alerts workers when gas concentrations exceed set safety levels.

The ARA H2S clip monitor operates for 24 months maintenance-free, with continuous operation. The 36-month model, provides you with even more life for a competitive low-cost price, simply slip the detector into hibernation mode when you’re not using it to extend its service life, ideal for contractors who only visit site on occasion.

The H2S sensor is designed to withstand the harshest industrial working conditions, typical applications include:

  • Site wide safety
  • Plant turnaround processes

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Hydrogen Sulfide (H2S) Gas Detector


Designed with practical applications in mind, the ARA Hydrogen Sulfide (H2S) unit weighs just 92g and is equipped with a sturdy clip for attaching to workwear positioned close to the breathing zone. At only 87mm in length, it does not impede worker movement and is suitable for use in confined space working, such as maintenance to pipes or tankers. As an intrinsically safe model, users can be assured it’s safe in all environments, with a three-signal system of a flashing light, audible alarm, and vibration to alert the wearer of exposure levels reaching dangerous concentrations.

The ARA Hydrogen Sulfide gas detector has a daily self-test feature that tests the audio, visual and vibration alarms to give you confidence that workers are protected.

The ARA IR link* allows you to download 30 recent event logs and configure setting including:

  • User ID
  • Low / High alarms
  • Self test intervals
  • Bump test intervals

Ultimate Performance

  • 24 months of continuous operation
  • Live H2S readings
  • Event logging download
  • Water and dust resistant
  • Robust to withstand extreme operational environments

Ultimate Safety

  • Instantaneous alarms
  • Adjustable high/low alarms
  • Calibration and bump test reminders

Ultimate Flexibility

  • Lifetime remaining countdown helps users to plan for future projects and site shutdowns
  • Displayed data option (live reading or lifetime remaining)
  • Hibernation feature to extend the life of the device up to 36 months.

Hydrogen Sulfide Gas Detector – Technical Specification

qps_ certification

Sensor Type Single plug-in electrochemical cell
Detection Range H2S: 0 to 100 ppm
CO: 0 to 300 ppm
SO2: 0 to 50 ppm
O2: 0 to 25 %
Event Log Storage Last 30 events
Battery 3.6 Vdc, 1.65 Ah, lithium battery
Battery Life / Shelf Life Standard models: 24 months of operations (2 mins alarms per day)
Hibernation models: 36 months of operation (2 mins per day and using sleep function)12 Month Shelf Life
User Options User ID
Low Alarm
High Alarm
Displayed Data (live reading or lifetime remaining)
Bump-Test Interval
Calibration Interval
Self-test Interval
Alarms Audio Alarm: (95 dB @ 10 cm)
Visual Alarm: LED
Vibrating Alarm: Vibrator (operates at ± 10 °C)
Temperature H2S, CO, SO2: – 40 to 60 °C
O2: – 30 to 60 °C
Humidity: 5 – 95 % RH
Ingress Protection IP67
Display Liquid Crystal Display (LCD)
Weight and Dimensions 92 g (3.2 oz)
87 x 50 x 29 mm (3.4 x 2.0 . 1.1 inch)

* All specifications quoted are at calibration point and under the same ambient conditions.
Specifications are based on isobutylene calibration at 20 ˚C, 90% RH and 1000 mBar
*Model dependant.

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The ARA DOCK4 is a bump test and calibration station that can test up to 4 ARA Single Gas Detectors simultaneously reducing gas usage and testing time. The ARA DOCK4 is simple to operate and records calibration and bump test reading along with the serial number, date and time.

To find out more about the ARA DOCK4 available from ION Science, including the H2S Single Gas Detector, please fill out the form HERE.

*ARA DOCK4 is sold separately

ARA DOCK4 Manual
ARA DOCK4 Calibration dock

Video Library


Find out more about the ARA DOCK4 Bump Test and Calibration Station.

Find out more about ARA Single Gas Detector Range

Find out more about the ARA gas detector, its functionality and models for H2S, CO, SO2 and O2 gas detection.

What does ppm look like?

The term Part Per Million is fairly self-explanatory, it’s simply the dilution of one matter into another but what does it actually look like?


For further supporting documentation for ARA H2S gas detector, please see below.

ARA H2S Single Gas Detector – Accessories and Replacement Parts

For further supporting documentation for ARA H2S single gas detector please see below.

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ARA H2S Single Gas Detector Enquiry Form

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