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Wireless gas detection with Crowcon’s Detective Net

28 January 2014

Crowcon’s new Detective Net wireless module allows up to 25 Detective+ gas detectors to be linked without cables. It is ideal for use in the oil, gas, petrochemical and utility industries. The Detective+ is a free-standing, transportable multigas monitor that can be used individually or in groups to monitor up to four gases at once.

By using the Detective Net module, up to 25 Detective+ units can belinked wirelessly and positioned as much as 100 metres apart. Should wirelessconnection between two of the detectors weaken, the RICOCHET® wireless networkwill ‘self-heal’ and automatically re-route communications via alternativedevices. This creates a ‘mesh’ type network, ensuring greater reliability insafety-critical situations.

Over a dozen gas sensor options are available with theDetective+, including infrared sensors for flammable gas that are immune to thepoisoning effects which plague standard flammable gas sensors. If a dangerousgas level is detected, the Detective+ unit warns with a wailing 104 dBA sirenand flashing, high intensity LED beacons which are  visible from all angles. A signal is alsosent to all the other units, alerting workers to the danger. In additionDetective Net transmits other fault information such as loss of signal or lowbattery power.

If the signal is very weak, for example because of thickmetal bulkheads, Detective Net can act as a repeater to boost the signalbetween units. A cable can even be used to extend the reach of an individualDetective+ unit and put it in a position with a stronger wireless signal – thisis especially useful in cramped, confined spaces.

The Detective+ is indeed ideal for confined spaces, ensuringsafe gas levels before workers enter and monitoring continuously during weldingand other repair work.  With 60 hours ofbattery operation, work can go on with a minimum of detector recharging, keepingshutdown time as short as possible.  Incommissioning new liquefied natural gas (LNG) plants, the Detective+ can beplaced along the pipelines to check for leaks, minimising explosion risks.

The rugged tripod construction and raised profile keeps theDetective+ sensors away from obstructions and surface water.  An integral safety cage gives extraprotection in the event of the unit being overturned in chaotic workareas.  An operating temperature range of-20°C to +40°C assures reliable detection in a variety of environments.  The units are Class 1 Division 1 Groups A, B,C, and D approved.  Optional folding legsfacilitate compact storage and transportation.

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