T4 and T4x portable four-gas detectors (CO, H2S, combustible, O2)
Country: United Kingdom · Model: T4 / T4x
The portable T4 gas detector monitors CO, H2S, combustible gases and oxygen deficiency at the same time. It weighs 282 g and measures 135×80×35 mm. It is carried on rounds of water utilities, municipal networks, oil and gas and industrial sites that need a simple, rugged instrument with a low cost of ownership.
- Gases
- CO, H2S, combustible gases, O2
- T4x sensors
- dual toxic CO/H2S, long-life LLO2 oxygen sensor, MPS combustible gas sensor (over 15 gases, no poisoning)
- Dimensions / weight
- 135×80×35 mm; 282 g
- Durability
- 4 m drop test onto concrete; built-in rubber boot
Technical specifications
| Gases | CO, H2S, combustible gases, O2 |
|---|---|
| T4x sensors | dual toxic CO/H2S, long-life LLO2 oxygen sensor, MPS combustible gas sensor (over 15 gases, no poisoning) |
| Dimensions / weight | 135×80×35 mm; 282 g |
| Durability | 4 m drop test onto concrete; built-in rubber boot |
| Battery | Li-ion; T4 about 18 h; T4x up to 35 h (MPS and LLO2); charging 5.5 h |
| Data log | 130 h of data, up to 3500 events |
| Protection | IP65 and IP67 |
| Explosion protection | T4: II 2 G Ex db ia IIC T4 Gb; T4x: II 1 G Ex ia IIC T4 Ga (zone 0); UL/cUL Class I Div 1 |
| Functions | TWA Resume, 180° display rotation |
| Temperature | −20…+55 °C |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The housing survives a 4 m drop onto concrete, the rubber boot comes as standard, and a removable filter cover keeps dirt off the sensors. Protection against water and dust is confirmed to IP65 and IP67. A single large button and a simple menu are designed for use in gloves with almost no training. The backlit display rotates by 180°, so readings stay visible when the unit is clipped to clothing. The alarm combines sound above 95 dB, red and blue LEDs and vibration. The TWA Resume function calculates the time-weighted dose of toxic gas for the shift correctly even if the unit was switched off for a break or while moving to another site. The log holds 130 hours of data and up to 3500 events, and the operating temperature is from −20 to +55 °C.
How to choose
T4 and T4x are chosen by zone class and sensor set. T4x is approved for zone 0 and can be fitted with a dual toxic CO/H2S sensor, a long-life LLO2 oxygen sensor and an MPS combustible sensor that does not poison and recognises over 15 combustible gases. With the MPS and LLO2 pair, run time rises to 35 hours and sensor replacement costs fall. When a fifth channel or pumped sampling is needed, look at the Gas-Pro for up to 5 gases, and for ammonia, ozone or SO2 the Tetra 3 is suitable.
Request a price and lead time
T4 and T4x portable four-gas detectors (CO, H2S, combustible, O2). We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What explosion protection marking do T4 and T4x have?
T4 is marked II 2 G Ex db ia IIC T4 Gb under ATEX/UKCA and IECEx, holds UL/cUL Class I Div 1 and INMETRO approvals and complies with the MED directive for ships. T4x is marked II 1 G Ex ia IIC T4 Ga for zone 0.
How many hours does T4 run on one charge?
The Li-ion battery of the T4 lasts about 18 hours, and the T4x with MPS and LLO2 sensors runs up to 35 hours. A full charge takes 5.5 hours.
Is the TWA calculation disturbed if the T4 was switched off in the middle of a shift?
No, the TWA Resume function keeps counting the dose after the unit is switched on again, so the time-weighted value for the shift stays correct. Data is stored in a log of 130 hours.
Does T4 work with I-Test test stations?
Yes, both versions, T4 and T4x, support I-Test test stations and the Connect cloud system.
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