The AN/NZS 4641-compliant 4OxLL redefines oxygen sensing for mining applications, with unsurpassed stability in challenging environmental conditions, minimised nuisance alarms and extended operational life.
City Technology, which is in the Honeywell group of companies, will showcase its gas sensing range at the Honeywell Life Safety booth A275.
One of the key drivers of the launch in Australia is improving the reliability of gas detectors in underground mines while reducing cost of ownership, according to Honeywell Life Safety marketing director Mario Maura.
Protecting workers in underground mines from oxygen depletion and the hazards of toxic and flammable gases is a continuous challenge, he says.
Companies must not only maximise safety and adhere to stringent regulations, they must also leverage operational cost efficiencies, while ensuring their people and assets are protected. Selecting the right gas sensing solution is an intrinsic aspect of fulfilling this remit.
“Mining applications represent some of the most challenging environments for portable gas detectors,” Maura said.
“Temperature and relative humidity (RH) can fluctuate dramatically as workers move from external locations into hot and humid mining environments and pressure shocks can occur during mine shaft lift descent, sometimes resulting in incorrect oxygen readings.
“These aspects can make nuisance alarms a prevalent and costly issue.”
A portable gas detector is only as good as the sensors it contains, according to Maura.
“The serious safety concerns created by the abundance of flammable and toxic gases and the depletion of oxygen in underground mines means only the highest performing sensors can be used,” he said.
“Our new AN/NZS 4641 compliant 4OxLL oxygen sensor is the result of more than 35 years experience serving the mining industry for City Technology.
“In fact, our company was founded from a joint project with the National Coal Board in the UK in the 1970s, where we developed and patented the first mining carbon monoxide sensor.
“Since then, we have been innovating and pioneering mining sensing solutions that raise the global industry standard – and 4OxLL is no exception, providing an impressive combination of specification advantages.
“For example, our 4CM carbon monoxide sensor was designed to meet the world’s most challenging mining standard – the Chinese Mining Specification, AQ6205-2006.”
The 4OxLL incorporates a patented electrochemical cell internal geometry – designed using Six Sigma and FEM modelling practices and manufactured to exacting standards.
Most oxygen sensors struggle under the considerable adverse conditions of a mine due to large temperature and RH changes, pressure shock or vibrational damage, which can cause nuisance alarms or sensor damage, according to Maura.
“Not only does this compromise life safety but it can prove very costly in terms of downtime, sensor replacement and maintenance requirements,” he said.
“[But] 4OxLL’s revolutionary component design virtually eliminates these occurrences, working without any issue in changing humidity and temperature conditions.
“Designed as a five-year solution, this sensor lasts as long as the operational life of a typical portable gas detector.
“Most oxygen sensors last approximately two years.”
