Products - Acoem

Features

All-in-one efficiency

Reduce capital costs with 8-in-1 simultaneous monitoring of toxic gases, visibility, temperature, and humidity.

Plug & play

Eliminate in-tunnel gas bottles with 'plug-and-play' sensor modules that swap in minutes.

Long life

Built from high-quality 316L stainless steel for maximum service life and corrosion resistance.

Rugged enclosure

Rugged IP66 enclosure endures harsh environments and high-pressure tunnel washdowns.

Simplified connectivity

Features circular multi-pole plugs for fast installation and easy 'return-to-base' servicing.

Compliance

Complies with the EN 50545-1:2011 gas detection safety standard for road tunnels.

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Resources

Vecta
Data Sheet

Advanced measurement technology

The VECTA integrates two distinct, high-precision measurement principles into a single, compact housing to provide a comprehensive view of the tunnel atmosphere.

Dual-purpose optical visibility & smoke detection

The VECTA utilises a light-scattering technique for highly sensitive visibility measurements. An internal light source (TX turret) emits a beam, and a receiver (RX turret) detects light scattered by particles in the air.

This monitor delivers precision readings over a standard road tunnel range of 0 to 15 km-1, whilst its high dynamic range allows it to double as a dry smoke monitor
(up to 4000 km-1) for rapid fire detection. Built-in temperature and humidity compensation ensures stable performance across all environmental conditions.

Intelligent electrochemical gas sensing

Toxic gas concentrations are measured using specialised electrochemical cells.

Modular “smart” design: These cells are housed within pre-calibrated, plug-in Gas Sensor Modules. These modules store their own factory calibration data, serial numbers, and expiry dates, which the VECTA’s main CPU reads automatically upon installation.
Reliable performance: To ensure accuracy in the variable conditions of a tunnel, the gas measurements are fully compensated for temperature and humidity.
Multi-gas capability: The system can monitor up to two toxic gases simultaneously (typically CO, NO2, NO), with a response time (T90) of less than 60 seconds.

The “single-point” efficiency paradigm

The VECTA’s primary technical advantage lies in its ability to measure up to eight parameters simultaneously from a single mounting location. Unlike traditional tunnel monitoring that requires separate instruments for visibility and each specific toxic gas, the VECTA integrates light-scattering technology for visibility with dual gas monitoring ports for electrochemical cells. This consolidation significantly lowers the “Total Cost of Ownership” by reducing the electrical infrastructure needed—requiring only one power and comms cable rather than a complex web of wiring for multiple standalone sensors.

Maintenance revolution: the plug-and-play GSM

The core of the VECTA’s gas measurement system is the pre-calibrated Gas Sensor Module (GSM). In most tunnel environments, calibration is a logistical nightmare involving the transport of heavy, high-pressure gas cylinders into active traffic bores. The VECTA eliminates this by utilising smart modules that store their own factory calibration data. Maintenance staff can simply swap an expired module for a new one in minutes, achieving instant recalibration without ever opening a gas bottle in the tunnel.

Accessories & software

VECTA utility software: Windows-based package for instrument set-up, control, real-time data logging, and diagnostic overrides.
Audit filter kit: includes a calibrated span visibility filter for in-situ performance checks.
Replacement GSMs: Pre-calibrated CO, NO2, and NO modules available to ensure continuous accuracy.
Termination units: Optional local cable termination units (TSL-CTU) with optional integral 24V power supplies.