Ventilation Adjustment /Monitoring - asecos APA.145.75 Mode D'emploi

9. Ventilation adjustment /monitoring

The integrated exhaust air fan extracts a minimum volume of 330 m 3 /h from the hazardous material workplace. This
extraction volume is sufficient in accordance with the air-related test to DIN 12924-4: 2012 (in conjunction with BS
EN 14175-3 section 5.4) to prevent pollutants from escaping from the hazardous material workplace (laboratory test).
The power of the fan is sufficient for the connection of an exhaust pipe DN125 with a length of up to 7.5 m with 2 x
90° bends by the customer. If an exhaust pipe with DIN 100 is used, the length of the exhaust pipe is reduced to 1 m.
The faultless ventilation function is automatically controlled by a monitoring electronics system. A differential pressure
measurement device monitors air volumes in the extraction air shaft. The pressure sensor has an adjustable nominal
value.
The nominal value is set in relation to the stated nominal (minimum) air quantity. An alarm (lighting up of the red LED
"Exhaust air malfunction" and acoustic signal) is issued in the case if an approx. 10 % deviation from the set rated air
value. The acoustic alarm can be cancelled by pressing the "Reset" button. The optical alarm only stops when the rated
value is again attained. Operation of the air monitoring unit is ensured by the integrated rechargeable battery, even in
case of a power failure.
10. Construction, mode of operation
The hazardous material workplace mainly consists of plastic-coated high-grade sheet steel, RAL 7035 light grey. A joint-
less, liquid-tight plastic sump serves as the working surface. The melamine-resin coated baffle wall and all components
for exhaust air are made of plastic. An inserted melamine-resin MDF board serves for pressure relief and simultaneously
as a cover. The bulbs in the work area are mounted to avoid glare and have a lighting intensity of approx. 500 lx. There is
an integrated exhaust air fan in the head section of the hazardous material workplace (optional: without exhaust air fan).
The gases, vapours or suspended solids originating from handling hazardous materials are collected by effective extrac-
tion via the suction slots in the rear section and discharged to the exhaust system. Safe and correct functioning is shown
by the ventilation monitoring mechanism which is fitted as standard.
11. Electronic monitoring system/self-test
The hazardous material workplace APA.145.xx is fitted as standard with an electronic monitor.
The electronic monitor performs a self-test after first connection of the device to a power supply. Depending on the
programmed start delay, the self-test takes approx. 1 or 2 1/2 minutes. For this, the LEDs are consecutively switched on
and off, the exhaust fan is switched on and the pressure sensor checked.
The two green LEDs light up if proper condition is established.
The self-test can be started manually. For this, keep the reset-button pressed for 3 seconds.
The electronic monitoring system is arranged in the front left area with the following operating elements:
Display mains connection = green LED
Display operation = green LED
Display exhaust air malfunction = red LED
Reset of acoustic alarm = reset button
12. Option media supply
The additional media supply consists of a water and/or gas connection and an outlet. The gas and water outlet is
arranged on the rear wall, the shut-off valves at the front. The supply line for gas and water provided by the customer
must be installed on the rear side of the hazardous material workplace, immediately above bench height. Uniflex hose
connections with 1/2" internal thread with NBR gasket are available for this purpose. Connection may only take place
by a "competent person".
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