Case Study - Wireless Bluetooth Two-way Radio

Bluetooth® technology is changing the way workers communicate in high noise industrial environments. From IS smart phones to IS Bluetooth® enabled Two-way radios, there are more communication options available to industrial companies who have environments where IS certified devices are required.

Sensear has worked with a number of leading Oil and Gas companies to deliver Wireless Bluetooth® Two-way Radio communication solutions. These customized solutions solved challenging communication problems. This case study covers a customized double protection application.

Customer Problem

For years this customer had a problem communicating in noise environments up to 115DB. This involved using products that required communication ear buds under passive muffs, so that the workers could hear radio traffi c and still meet requirements for double hearing protection. Their existing solution involved several cables from the ears to a control unit, another cable from the boom mic on the passive headset, and a control box the user was required to wear with yet another cable to connect to the user’s two-way radio.

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The use of batteries in hazardous areas

The electric energy in alternating current produced by thermal systems (coal-fired or oil power stations etc.) or by hydroelectric plants, is "non-accumulable" while the energy in direct current can be stored using devices called "Battery". This system allows to dispose of the energy over time and to be able to use it even in the absence or failure of the supply of traditional energy in alternating current.
 
With the rechargeable batteries, the charge can be completely re-established through the application of adequate electrical energy, with voltage/current control. The most important characteristics are:
    • the voltage at the terminals (expressed in volts) 
    • the capacity (expressed in ampere/hour) 
    • the discharge time, expressed in A/hC (where "A" is the current, "h" is the capacity in hours and "C" is the number of cycles

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The importance of the anti-condensation and the pre-heating systems in electric panels for environments with risk of explosion

In electrical panels for industrial environments, are usually installed systems for preventing the formation of inside condensation, a formation caused by the heat exchange deriving from variations of the ambient temperature in the transition from day to night and vice versa.

It is known that all the metal junction boxes, during the change of temperature from the inside to the outside, undergo a "sweating" due to capillarity that determines the creation of cold air that changes into condensation/water.

To avoid this phenomenon, since long time the designers have been using simple but functional systems that guarantee the precipitation of the condensation on the junction boxes walls, using either paints that retain this phenomenon or heating systems.

For the same reason, also in electrical and electronic equipment for environments with danger of explosion, it is necessary to adopt the same criterion of prevention and, as this equipment are generally installed outside, they have a greater necessity respect to those installed inside in industrial environments.

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The materials suitable for hazardous areas

In chemical, petrochemical, oil plants and, generally, in all types of industrial facilities which present a danger of explosion due to the presence of gas in the form of cloud or flammable dust, there are also harsh chemical substances that can be harmful and source of deterioration of electric and non-electric equipment.  

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