Crowcon T4x Portable Four-Gas Detector
Portable four-gas detector with long-life O₂ and MPS sensor technology according to Crowcon’s catalog.
Original manufacturer: Crowcon.
Hazardous-area suitability depends on the exact ordered version and approvals. Do not infer certification from other Crowcon devices.
Official Source
Crowcon official product range →
T4x — long-life O₂ and MPS design choices
T4x’s stated long-life oxygen and MPS combustible sensor technology differs from older T4 configurations. Confirm gas-specific measurable ranges, response and calibrations before swapping it into a fleet that uses catalytic instruments. The MPS channel’s tested combustible-gas response must be evaluated for the site’s identified substances, not assumed universal. Current Ex certification, charging restrictions, ingress rating and alarm settings belong to the exact purchased T4x variant.
T4x — MPS and long-life oxygen in a Zone 0-rated Type 1 — manufacturer technical specification review
Crowcon’s exact product model and options determine gas range, electrical interface, battery, field application and instrument safety certification. Ratings below are not a universal family promise.
| Attribute | OEM model data | Selection consequence |
|---|---|---|
| Typical channels | O₂, CO, H₂S, and a chosen combustible gas sensor | Four-channel selection and supplied gas readings depend on sensors fitted. |
| Advanced technology | MPS combustible sensing and LLO₂ long-life oxygen options; dual CO/H₂S cartridge | MPS’s broad combustible response is not a solvent-selective PID. |
| Battery difference | Up to 35 h with MPS/LLO₂ options vs up to 18 h with standard sensor | Advertising 35 h on a basic sensor build would be misleading. |
| Mechanical | 135 × 80 × 35 mm, ~282 g, 4 m drop-test | Keep clean diffusion path after physical impact. |
| Alarm/logging | 95+ dB, vibration, 130 h trend and up to 3,500 events | STEL/TWA and calibration must be configured for actual worker exposure. |
| Ambient / sealing | −20 to +55 °C; IP65/IP67 | Gas element temperature may have additional limitations. |
| Ex distinction | ATEX II 1 G Ex ia IIC T4 Ga (T4 Type 1), IECEx equivalent | Distinct from original T4 Type 2 Ex db ia IIC T4 Gb Zone 1 rating. |
| Field communication | USB and I-Test/Crowcon Connect workflows with suitable accessory | Local gas warning must work independently of internet. |
Commissioning and risk limits
The major selection point is technology and approval, not just color or battery runtime. MPS may offer resistance to conventional pellistor poisoning and a wider combustible-gas response, but the flammable-gas mix and calibration model must be checked with the manufacturer. Choose T4x when its exact Zone 0 Type 1 approval and instrument options are needed; do not transfer its Ga approval to an existing T4 Type 2. Confirm startup/bump test, alarm logs, user shift TWA and instrument firmware before deployment.
Primary technical source: Crowcon original product data, approvals and model resource library. Exact gas-specific detector, current order code and Ex/IECEx schedule must be checked against supplied hardware.
Independent AirAlign technical editorial assessment · 25 October 2026. Information is not a stand-alone Ex/SIL or occupational safety certificate.