Anemometer Type WGA 15.07
Evaluator Type GMA 30.00.6xx
Ventilation measuring and monitoring unit
Type WMA 15.07.6xx
I M1 Ex ia I Ma- Measurement range: 0.15...12.00 m/s or 0.005...1800 m³/s
- Hot-film measurement principle, very low long time drift
- High accuracy of measurement by use of additional temperature and pressure sensors for compensation
- Adjustments or status enquiries by means of press buttons or magnetic pointer. The housing stays closed.
- The Connection of Anemometer over cable is plug able
- Code lock to prevent unauthorized manipulation (deactivate able)
- Fault self diagnosis with display
- Test of the output signal by simulated measuring values
- Choice between frequency or current output signal (optional)
- Measurement span of the measured value output is adjustable
- Two limit value outputs with opto-couplers or relays
- The components can be replaced individually
- Low power requirements
The permanently installed wind speed measurement and monitoring unit WMA 15.07.6xx has been designed for, among others, the continuous monitoring of the air currents in the mines and other areas of the coal industry.
The electrical construction of this device conforms to the explosion protection rating of intrinsic safety „i“, catagory I M1 Ex ia I Ma. This means that this device can be used in the zone M1 of underground mines, even when unpermitted high concentrations of the methane gas are prevailing. This certification conforms to the ATEX Directive 94/9/EC for equipment and protective systems intended for use in potentially explosive atmosphere.
The economical, permanently unit is characterised by its stable measurements, simple and secure operation. The housing should stay closed.
The wind speed is measured according to the principle of hot-film Anemometer. Wind speeds in the range of 0.15 to 12.00 m/s can be measured. Also the volume throughputs between 0.005 and 1800 m³/s can be read off. If required other measurement ranges can be made available. By continous measurement of the prevailing temperature and pressure the measurement accuracy is increased. The measurement channel is protected over long periods by a dust filter which can be replaced easily.
The operation is very simple: The housing need not be opened and the operator places a small magnetic press button unit on the device. As an alternative he can also use a magnetic pointer. A four digit code can be entered for protection against unauthorized changes of the set values. A self monitoring microcontroller system not only processes the measurement values precisely, it also carries out the operator specific instructions such as the entry of the code, signal instructions and outputs, analogue and digital outputs and test functions etc. A four digit display shows the measured values in 12 mm high digits. The second line of the displays shows the adjusted limits and the information about their status.
The anemometer WGA 15.07 and the evaluator device GMA 30.00.6xx are connected to each other by means of plugs and a connecting cable VDL 5.
For the transmission of the measured values a 5/6...15Hz output is available. As an option a 0.1/0.2....1/mA or 4...20mA output can also be supplied. The transmission of the measured value signals can be checked against quartz stabilised test signals from the evaluator.
For triggering the local alarms two integrated limit value switches with a single opto-coupler outputs are available. Switching status and signal transmission are shown by LED displays. Both the limit values can be set up independently over the entire display range. Switching delays can be set between 3 and 20 seconds
