Trolex Sentro Wireless TX6355, Руководство пользователя, Страница: 17 / 57

P5596.1600 rev B 17
www.trolex.com
TX6355 User Manual
Sensor coverage cannot be simply expressed in terms of ‘number per unit area’.
Sensors need to be sited where they are capable of monitoring those parts of a plant
where gas may accumulate or where a source of gas release is expected
to occur. This way, the earliest possible warning of a gas release can be given to
initiate shutdown functions, alarm functions or safe evacuation of the premises.
Trolex recommends that the Sentro Wireless Gas Detector is positioned a minimum of
6 m (20 ft) and no more than 245 m (800 ft) from a Strata CommTrac C node for the
Sentro Wireless Gas Detector to work effectively.
Sensor Management
A very important part of an efficient gas monitoring system is the training of plant
personnel in operation and maintenance of the sensors and the complete monitoring
system. Training can be provided by qualified Trolex application engineers. Once a
sensor installation is complete, the sensor locations and types should be formally
recorded and a planned test and maintenance procedure instituted.
STEL and TWA
Selected toxic gas sensors are equipped to automatically calculate STEL and TWA
limits in accordance with COSHH standards. If the facility is selected for use, ensure
that all accumulated data is reset to zero before the commencement of a working
period.
Checkpoint
STEL: Short term exposure limit of total accumulated units over a rolling fifteen
minute period. TWA: Time weighted average of gas concentration over a working
eight our period.
3.4 Connections
The Sentro Wireless sensor connects wirelessly to the Strata CommTrac mine wide
wireless network. Power is provided by batteries contained within the housing. No
hard wiring is required.
3.5 Connecting in Hazardous Areas
Certified Intrinsically Safe for use in underground mine hazardous areas.
The installation must be in accordance with the Sentro Wireless certification
parameters.