Silverton, , South Africa
Engineering Products - Manufacturer,
Proprietorship Firm Since 0
SAFDY Solid State Airflow Sensor
The proven way to accurately measure airflow in mines, independent of small particles
The SAFDY solid-state airflow sensor was originally designed for the South African diamond and coal mining industries for monitoring airflow underground to determine whether the ventilation system - so crucial for human life - is functioning. Available in fixed-mount and hand-held models, the system has a remote sensing head for continuously monitoring airflow and is designed to be interfaced to a remote telemetry system. The output of the SAFDY airflow sensor can easily be displayed as trend graphics on a SCADA software program.
Besides having proved itself in the harshest of South African mining conditions, the SAFDY airflow sensor has also been tested against propeller and resistance types of sensors by the country's foremost scientific institution. The SAFDY airflow meter was found to be "the most suitable for underground application from a durability and applicability point of view."
SAFDY VORTEX FLOWMETERS :-
- Remote sensing head for continuously monitoring airflow
- Designed to be interfaced to a remote Telemetry System
- The output of the Airflow sensor can be displayed as trend graphics on a Scada software program.
- Originally designed for the South African mining industry, specifically to monitor underground in the gold, coal or diamond mine, but can also be used for industrial applications.
The SAFDY solid-state airflow sensor was originally designed for the South African diamond and coal mining industries for monitoring airflow underground to determine whether the ventilation system. - Safdy Systems Vortex Shedding :- - Highly accurate - Linear over very wide range - Once-off factory calibration only - No degradation over lifetime - High initial purchase price - Lower maintenance cost - Propeller Type :- - Bearing slippage problem at low velocities - Bearings degrade with time - Susceptible to damage in harsh environment - Low initial purchase price - Needs regular calibration - High maintenance cost - Resistance Type :- - Dependant on air mass (chill factor) - Compensation for humidity - Compensate for air pressure - Sensor must be kept clean - ADVANTAGES OF SAFDY SYSTEMS :- - Intrinsically safe for use in coalmines - Linear Output - Highly accurate - Wide turn-down ratio - Rapid response - Excellent repeatability - Highly reliable - Rugged construction - Low lifecycle cost - No moving parts - No calibration - Highly producible - Construction :- - Solid-state design airflow sensor - Measures airflow using the VORTEX method - Vortex method is a proven way to measure the airflow very accurately - Vortex method is independant of small particles present in the air stream - like water droplets - The airflow sensor is housed in a stainless steel box - The lifespan of the airflow detector can be in excess of ten years. - Advantageous characteristics :- - Airflow speed maximum range of 40m/s or 144 km/hour - Linear output proportional to airspeed - Highly accurate, dependant on the width of the "accentuatar" bar - Calibration is a function of the width of the bar - Rapid response of change of airflow - Excellent repeatability inherent to the vortex principles - Very low lifecycle costs due to no moving parts - Insensitive to small particles, dust or waterdroplets in the airstream - Internal DIL switch for different ranges of airspeed - Output is a standard 4-20mA
P O Box 912870,
Silverton - 0127 () South Africa