OdorCheck

The Gastech OdorCheck is a portable handheld THT (Tetrahydrothiophene) odorant concentration meter designed specifically for gas network operators to verify odorization levels in natural gas distribution pipelines. The instrument housing is a slim, rectangular yellow and grey body — identifiable by its color display panel, five-button navigation interface, single side-mounted gas inlet port with integrated connection fitting, and a red indicator LED. The selective sensor technology responds specifically to THT — the sulfur-compound odorant mandated across Italian and European natural gas networks — delivering concentration readings directly in mg/m³ output units. The instrument carries product code FA.0050.THT.0001 and sits within Gastech’s Gas Metano e GPL product family.

Gas sample is drawn directly into the instrument through the flexible measurement hose connected to the pipeline access point. The selective sensor responds to THT concentration within a short measurement window, with the instrument’s automatic algorithm controlling the measurement cycle, sensor regeneration timing, and stability confirmation before outputting the final reading. This automated sequence eliminates procedural errors that can arise when operators manually judge measurement completion. The data logger function stores measurement results with measurement point identification, date, and time, allowing complete odorization audit trails to be compiled across an entire survey route. Results are downloadable via interface for transfer to data management systems. The instrument also performs continuous ambient air monitoring as a secondary function, providing a personal safety signal to the operator during handling of odorizing substances.

The Gastech OdorCheck is deployed by gas network operators and distribution companies during mandatory periodic odorization verification surveys across methane gas distribution networks — measuring THT concentration at network sampling points, metering stations, district regulator outlets, and end-of-network points to confirm that gas reaching consumers contains odorant at the mandatory detection threshold. Italian regulations require natural gas to carry sufficient odorant to be detectable at 20% of its Lower Explosive Limit (LEL).

Leader Infra supplies this THT-selective portable odorant meter for gas network operators and distribution companies — delivering traceable, data-logged odorization verification across all mandatory network measurement points in a single compact field instrument.

FAQ — Why does Italian gas regulation specify a minimum THT concentration level in distributed natural gas? Natural gas is odourless in its pure form and cannot be detected by human senses at low concentrations. Italian and EU regulations mandate that distributed gas be detectable by smell at a concentration of 20% of its Lower Explosive Limit — long before it reaches a dangerous level. THT is the primary odorant used in Italy for this purpose, and periodic instrumental measurement of its concentration across the network confirms that odorization remains within the required range at all points of the distribution system.