Hydrogen Sulfide (H2S) Single Gas Detector

Keeping Workers Safe and You Compliant

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 desensitize 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 more life for a competitive low-cost price by simply slipping the detector into hibernation mode when you’re not using it to extend its service life. This instrument is ideal for contractors or consultants who only visit site on occasion.

The H2S sensor is designed to withstand the harshest industrial working conditions. Typical applications include:

  • Site wide safety
  • Confined space entry
  • Plant shutdown processes
  • First response safety

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Hydrogen Sulfide (H2S) Gas Detector


Designed with practical applications in mind, the ARA Hydrogen Sulfide (H2S) unit weighs just 3.25 oz and is equipped with a sturdy clip for attaching to workwear positioned close to the breathing zone. At only 8.7cm 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 they’re safe in all environments due to the device’s three-signal system of a flashing light, audible alarm, and vibration, alerting the wearer of dangerous exposure levels.

The ARA Hydrogen Sulfide gas detector has a daily self-test feature that tests the audio, visual and vibration alarms, giving you confidence that your 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 readings
  • Event logging download
  • 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.

Technical Specification

qps_ certificationIECEx certificationATEX certfication

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)

* 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.

What’s in the box?

See the contents in the box and what you receive when you order an ARA gas detector for safety compliance monitoring!

Find out more about ARA Single Gas Detector Range

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


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

H2S Single Gas Detector – Accessories and Replacement Parts

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