SAFDY - Underground Airflow and Gas DetectorsSAFDY produce detectors for the continuous monitoring in underground mining conditions. All SAFDY detectors connect to a telemetry system to display information on a SCADA package. SAFDY recognise the requirement of a high quality product to operate within the hostile mining environment, as well as this criteria, the specifications of the customer must be met with value for money. Additionally, SAFDY provide after-sales service of the product, along with prompt repair times. SAFDY products are designed to ATEX specifications, and manufactured with robust stainless steel housing. All PCB's are triple conformal coated, and have an SMD electronic circuitry design. SAFDY are based in, and design all of their products in South Africa, meaning that all parts and components are readily available. This eliminates delays associated with importing replacement parts. The SAFDY range of detection products includes the following:
SAFDY VORTEX AIRFLOW DETECTORThe SAFDY vortex airflow detector has a remote sensing head for the continual monitoring of airflow, and is designed to be interfaced to a remote telemetry system. The output of the airflow sensor can be displayed as trend graphs on a SCADA software program. This detector was originally designed for the South African mining industry, specifically to monitor underground in coal and gold mines, although it is also used for industrial applications. With a linear output proportional to air speed, the SAFDY vortex detector is highly accurate, and demonstrates excellent repeatability. Although the detector can have a lifespan of up to ten years, the elimination of moving parts provides very low life cycle costs. Another advantage of the SAFDY vortex detector is insensitivity to small particles, such as dust or water droplets in the air stream. The detector has an internal DIL switch for different ranges of airspeed, and the output is a standard 4mA to 20mA. Besides having proved itself in the harshest of South African mining conditions, the SAFDY airflow sensor has also been tested against resistance types of sensors by the country's foremost scientific institution. SAFDY HANDHELD VORTEX AIRFLOW INDICATORThe Airwolf II is a hand-held air velocity sensor which has been tested and proven over a long duration in harsh South African underground mining conditions. It uses the Vortex Shedding principle to accurately measure air velocity. There are no moving parts making the instrument highly insensitive to dust, temperature and humidity. The unit comes with a leather pouch for easy belt attachment.
SAFDY METHANE DETECTORThe SAFDY methane detector is highly accurate, and four times more sensitive than conventional CH4 sensors. The product has a remote sensing head for continuous monitoring of 0%-5% methane/volume. The detector has a linear output proportional to 100% LEL. Zero and span calibration is completed via an internal twirl-port. The SAFDY methane detector demonstrates a rapid response to a change of detected CH4. The SAFDY CH4 utilises the reliable NEMOTO pellistor. An active pellistor forms one part of a Wheatstone bridge circuit. Catalytic oxidation of atmospheric methane causes an increase in temperature, hence the resistance of the pellistor. This causes an imbalance in the bridge, which is detected, amplified and processed for output as a 4mA to 20mA signal. A second (inactive) pellistor forms the second leg of the Wheatstone bridge, which provides compensation for variations in ambient pressure and temperature. CARBON MONOXIDE DETECTORThe SAFDY carbon monoxide detector has a remote sensing head for continuously monitoring CO gas up to 200ppm. This detector is designed to be interfaced to a telemetry system, and has a linear output proportional to parts per million CO gas. This product is highly accurate, and dependent on the sensitivity of the CO cell. Replacement of the CO cell is economical, meaning that the detector has very low life cycle costs, despite of a possible life span for the product of up to two years. There are no external settings, and output is a standard 4mA to 20mA. When air containing carbon monoxide passes through the membrane, catalytic reaction on the platinum electrode converts the carbon monoxide to carbon dioxide. This process generates an electric current directly proportional to the absolute number of CO molecules. Below is a list of mines/shafts where SAFDY airflows are installed:
SAFDY
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  SAFDY produce high quality detectors for the continuous monitoring in underground mining conditions, such as the SAFDY vortex airflow detector. | ||
 Airwolf II - intrinsically safe handheld airlfow meter. | |||
 The SAFDY methane detector is highly accurate, four times more sensitive than conventional CH4 sensors and utilises the reliable NEMOTO pellistor. | |||
 The SAFDY carbon monoxide detector has a remote sensing head for continuously monitoring CO gas up to 200ppm. |
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