Riken Keiki GX-3R

The Riken Keiki GX-3R is designed for workers who need continuous gas monitoring without bulky equipment. With a mass of approximately 100 g and dimensions around 58 × 65 × 26 mm, it is small enough to be worn unobtrusively on a lapel, harness or pocket. Positioning the detector in the breathing zone keeps sampling close to the nose and mouth, improving confidence that displayed readings reflect actual personal exposure rather than general area conditions.

The detector is configured as a personal 4-gas instrument for confined space entry and monitoring. It simultaneously measures combustibles, oxygen, carbon monoxide and hydrogen sulfide, covering the key hazards in tanks, pits, voids and other enclosed spaces. Wide measurement ranges support both normal operating conditions and upset scenarios. A diffusion sampling method provides continuous, real-time readings without the complexity, weight or power demand of an external pump, while an optional manual suction unit with various tube and rod configurations enables remote sampling and pre-entry checks when required.

The GX-3R incorporates multiple alarm types for both gas and fault conditions, helping distinguish environmental hazards from instrument issues. Alarms are delivered through bright flashing LEDs, a loud buzzer rated at approximately 95 dB at 30 cm and a strong vibration motor. This combination is designed to cut through background noise, PPE and poor visibility, supporting rapid awareness when gas levels exceed set limits or when the detector requires attention.

Intrinsically safe, explosion-protected construction makes the GX-3R suitable for use in hazardous gas and mining atmospheres, with international approvals including IECEx, ATEX and other regional schemes depending on the version. The IP66/68 enclosure resists dust, powerful water jets and immersion, supporting washdown and outdoor use. A robust housing with a replaceable rubber boot has been tested for drops up to 7 m, and optional protective accessories such as a heat-resistant case, leather case and display protective film further enhance durability in high-temperature, dirty or mechanically demanding environments. A marine-approved version with MED (WheelMark) certification extends use to vessel and offshore applications.

The GX-3R uses Riken Keiki’s R Sensor platform to deliver long sensor life and stable performance. The unique dual filament LEL sensor design provides around 40 times greater resistance to silicone poisoning than conventional configurations, helping maintain combustible gas sensitivity in contaminated environments. An optional hydrogen-compensated CO sensor improves accuracy where hydrogen is present, and an HC gas list function enables direct reading of multiple combustible gases, supporting mixed-gas and process applications typical of industrial confined spaces.

Rechargeable power options, including Li-ion and direct-charging Ni-MH packs depending on the model, provide long continuous operating time of around 40 hours per full charge in long battery mode. This supports extended shifts and multi-day deployments with minimal recharging. Fast charging capability, with certain versions fully recharging in roughly 180 minutes, reduces turnaround between uses. A flexible charging ecosystem includes single cradles, interconnectable cradle arrangements, five-unit charging cables and optional multi-chargers, allowing organisations to scale from a few detectors to large fleets without extending charge times.

The GX-3R supports three preset alarm levels per gas plus an over-range alarm, enabling configuration in line with workplace exposure limits such as EH40 where required. This configurability helps align personal monitoring with site rules and regulatory frameworks. An internal data logger records approximately 3600 events and around 300 hours of readings, providing a record for incident review, exposure analysis and audit trails. Data can be downloaded via an IrDA interface or dedicated data management software, allowing centralised storage, trending and reporting.

Multiple mounting and protection options make the GX-3R adaptable across roles and tasks. An ultra-slim 360° alligator clip, belt clip, arm and ankle belts, and a range of cases support secure attachment on clothing or PPE. A manual suction unit enables remote sampling, while charging cradles, a calibration station, data logger adapter and software streamline routine calibration, bump testing and record keeping. As part of the GX-3R family, with a clear upgrade path towards the GX-3R Pro, the detector supports fleet standardisation, common training and shared accessories, helping reduce spares inventories and simplify long-term gas detection management. A three-year overall warranty, including the oxygen sensor, combined with long-life sensor design and comprehensive support services, contributes to a low total cost of ownership.