Evaluator Type GMA 31.00.7xx
Anemometer Type WGA 15.15
CH4 sensor/transmitter
Type GMM 01.13
CO2 sensor/transmitter
Type GMM 04.14
VENTILATION MEASURING AND MONITORING UNIT
Typ AGA 15.15.xxx
I M1 Ex ia I Ma- Version for gas exhaustion pipes and pipelines
- Measuring range: 0.50...50.00 m/s or 0.001...50.00 m³/s
- Differential pressure measurement principle. Very low long time drift
- High accuracy of measurement by use of additional temperature and pressure sensors for compensation
- Outputs also for temperaure in the pipe and differential pressure pipe/environment
- CH4- and CO2- or CO-sensor/transmitter can be connected for measurement and evaluation as well as for optimal compensation of the gas influences
- Code lock to prevent unauthorized manipulation (can be switched off)
- Adjustments or status enquiries by means of a press button unit or a magnetic pointer. The housing need not be opened.
- Fault self diagnosis with alpha numeric display
- Test of the output signals by simulated measurement values
- Choice between normed frequency or current output signals
- Output range of the output signals is variable
- Four independent limit switches with optocouplers and/or relays in the evaluator
- Connecting cables between anemometer, optional sensors and evaluator are pluggable
- The components can be replaced individually
The permanently installed volume flow and wind speed measurement and monitoring unit AGA 15.15 has been designed especially for the continous monitoring of the flow in pipes and for the gas exhaustion pipes in coal mines.
The certification of the devices is conform to the explosion protection rating of intrinsic safety´i´, category Ex ia I Ma, I M1 of the ATEX-directive 94/9/EG. This means that the devices can also be used under unpermitted high concentrations of methane gas.
The economical, permanently installed unit is characterised by its stable measurements, and simple and secure operation with a closed housing.
The wind speed is measured according to the principle of differential pressure measuring with a special flow part. The flow velocity can be measured from 0.50 to 50.00 m/s or the volume flow can be measured from 0.001 to 50.00 m³/s.
The temperature and the pressure inside the pipe are also measured and used to increase the measurement accuracy.
The evaluator can display and output the gas concentrations of the optional CH4- and
CO2-/CO-sensors. These measued values are also used for an optimal compensation of the influences on the flow values.
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 large illuminated graphic display shows the measured values of the anemometer and the optional gas sensors in 10 mm high digits. Further on the limit switch conditions, status informations and messages in clear text are displayed.
The anemometer, the optional gas sensors and the evaluator are connected to each other
by means of plugs and a connecting cable VDL 6.
For the transmission of the measured values up to five 5/6...15Hz or 0.1/0.2....1/mA or 4...20mA outputs are available. The transmission of the measured value signals can be checked with test signals from the evaluator.
For triggering the local alarms four integrated limit value switches with optocoupler- or relay outputs are available. Switching states are shown by LEDs. The limit values can be set up independently. The switches can be elective assigned to the sensors.
