This procedure is meant to be carried out with no remarkable breaks (that is, breaks lasting over two hours).
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To avoid contamination, note the following precautions: Work in a clean environment with clean hands. Never operate the pump without the ozone destruction filter or purified air. Do not use a sensor loaded with solutions if the sensor is not connected to a powered interface (or if the anode and cathode wires are connected). |
Arrange the air flow meter as shown in Figure 1. The procedure for air flow measurement is described below. The numbers within brackets refer to the items in Figure 1:
- Fill the rubber bulb (4) and the flow meter tube with soap solution (8) almost up to the filling tube of the flow meter tube.
- Connect the air flow meter to the sensor cathode air exhaust tube. This is done by slipping the connector tube 3 (9) over the short Teflon tube protruding from the top plug of the sensor cathode chamber.
- With the radiosonde air pump operating, squeeze the rubber bulb (4) slightly to cause several soap bubbles to rise up the flow meter tube. Repeat the process several times, until the bubbles reach the top of the tube without breaking.
- Now form only one bubble, and use a stop-watch to determine the time (t) required for the bubble to rise from 0 to 100 ml up the flow meter tube (5). Repeat the measurement three times to obtain a mean value.
| When the air flow is measured, make sure the sensor is charged with the sensing solution. |
- 1
- Stand
- 2
- Bosshead
- 3
- Connector tube 1
- 4
- Rubber bulb
- 5
- Flow meter tube
- 6
- Clamp
- 7
- Connector tube 2
- 8
- Dishwashing liquid
- 9
- Connector tube 3