Hydrogen Sulfide Gas Detector: ARA H2S

If proper safety precautions are not taken, industrial sites in the petrochemical, oil and gas and offshore sectors can become dangerous. ATEX-certified and reliable gas detectors from Ion Science are the key to guaranteeing the safety of workers.

High levels of hydrogen sulfide (H2S) can quickly desensitize the human body, rendering it unconscious. As a result, dependable personal monitoring equipment is essential.

The ARA H2S portable alarm from Ion Science is an economical, wearable clip monitor that detects dangerous levels of H2S. The detector cautions workers if gas concentrations go beyond preset safety levels.

The ARA H2S clip monitor continuously runs maintenance-free for 24 months. The 36-month model provides a longer service life for a competitively affordable price. Its service life could be prolonged by just placing the detector in hibernation mode when not in use. This is primarily for contractors or consultants who visit the site occasionally.

The H2S sensor has been developed to withstand even the most severe industrial working conditions, with the following normal applications:

  • Plant turnaround processes
  • Site-wide safety


The ARA Hydrogen Sulfide (H2S) unit has been developed by taking all the real-world applications into account. Each unit weighs around 92 g and is equipped with a powerful clip that can be fixed in the immediate vicinity of the breathing zone.

As it is only 87 mm long, it is appropriate for small working spaces, like pipe or tanker maintenance, and does not hinder worker movement.

The three-signal system consisting of an audible alarm, flashing light and vibration warns the user when the H2S exposure levels reach dangerous concentrations, thereby making it highly safe for all environments.

Ion Science also produces O2, CO and SOequivalents for any of your other hazardous gas detection needs.

ARA personal gas monitors from ION Science

Video Credit: Ion Science

The self-test feature of the ARA Hydrogen Sulfide gas detector guarantees that the visual, audio and vibration alarms work well on a daily basis, thus guaranteeing the safety of the workers.

The 30 downloadable latest event logs and design settings available in the ARA IR link are:

  • User ID
  • Self-test intervals
  • Bump test intervals
  • Low or high alarms

Ultimate Performance

  • Live H2S recordings can be performed
  • Robust enough to function in extreme working environments
  • Dust and water-resistant
  • Event logging downloads are available
  • Non-stop operation performed for around 24 months

Ultimate Safety

  • Adjustable high or low alarms
  • Prompt alarms
  • Calibration and bump test prompts

Ultimate Flexibility

  • Hibernation feature to extend the service life of the device by up to 36 months
  • Live reading or lifetime remaining data display option
  • The lifetime leftover countdown helps to schedule for upcoming projects and site closures

Technical Specifications

Source: Ion Science

Specification Value
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 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)
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)

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