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Flow meter use instructions

1. - Remove the bobby (orange rubber teat) from the bottom of the flow meter and fill with a soapy water solution.

2. - Attach bobby with soap solution to flow meter rim as illustrated in fig 6.

3, - Attach flow meter as illustrated in fig 5, fig 6 or fig 7.

4. - Allow air to bubble through the system, substituting water in both the spherical and pear shaped flasks.

5. - By squeezing the bobby slightly, raise and introduce the soap solution to the stream of air, allowing it to form a series of soap bubbles or membranes. Once the bubbles reach the top of the flow meter column your flow meter has been primed and is ready for use.

6. - Introduce one bubble and note the time it takes to reach the 100ml mark.

7. - Increase or restrict the flow rate, using a clamp (Hoffman clamp) or small plastic tap (stopcock), so that it takes 6 seconds from the bubble/membrane formation to reach the 100ml mark

This equates to the required flow rate of 1L/min since - 100ml/6sec = 1000ml/60 sec = 1L/min.

8. - Now use this flow rate to set the water manometer for monitoring the flow rate for that particular system. (Note)