Air Entrainment Meters
0.5 litre; model: TESTING 1.0334 0,75 litre; model: TESTING 1.0337
1 litre; model: TESTING 1.0335 5 litre; model: TESTING 2.0332
7 litre; model: TESTING 2.0337 8 litre; model: TESTING 2.0334
Page 16 of 42 pages
9. Use a mallet or a rubber hammer to beat against the side of the air entrainment meter
so that the last remaining air bubbles will be removed.
Important: It is absolutely
necessary that all air be removed from the air entrainment met
er. If not all air is
removed, the reading will be incorrect, since this air pocket will be calculated as part
of the entrained air content of the mortar or concrete. Critical:
The water that flows
out of the meter must absolutely have no bubbles.
This means that a constant flow
of water from the squeeze bottle is necessary to remove all the air.
10. Close both the shut-off valves (A and B).
11. Turn the red ball-headed knob to the left to release (unlock) the pump piston rod of
the hand pump. Now pump up the air entrainment meter until the black pointer of the
pressure gauge slightly goes beyond the red marking pointer. This is the initial
pressure. Wait a few seconds until the air from the pressure chamber has adjusted to
the ambient temperature. If the black pointer has gone too far (i.e., past the red
marking pointer), correct the pressure by briefly pressing the CORRECTION button of
the correction valve (the black cap). Tap with your finger gently against the dial of the
pressure gauge until the pointer comes to rest. It is possible that your work until now
will have caused the black pointer to come to rest
above
the red marking, next to the
zero point. In this case, pump up the air entrainment meter again until the black pointer
is
below
the red marking.
Note
After you have pumped up the air entrainment meter, do NOT screw the
ball knob of the pump piston back down again. The threads under the
ball knob are provided
only for safety and security during transport
– or to screw down the piston
during cleaning
of the air entrainment
meter so that no water can enter into the pump sleeve.
12. Press the button TEST (green rubber cap) to activate the overflow valve. This will
allow the air from the pressure chamber to flow into the test pot. Press the green TEST
button several times until the pressure has equalized. At the same time, hit the side of
the container wall hard with a rubber hammer or other suitable tool. Then tap lightly
with your finger against the pressure gauge until the pointer comes to rest.
13. Now note the apparent air entrainment reading (A1) of the fresh mortar or fresh
cement in percent.
14. After the testing is finished, slowly open both of the two ball shut-off valves. This will
allow the pressure to be released from the test pot.
15. Press the TEST button to open the overflow valve and allow the remaining air to flow
out of the pressure chamber into the test pot. At this time, the pointer of the pressure
gauge will slowly return to its initial position.
16. Open the quick-release latches and take off the upper part.
17. If required, calculate the absolute air entrainment (Ac) by application of the aggregate
correction factor. This factor (given in percent by volume) is always the same for the
same aggregate. It must therefore be determined only once in such cases.
