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 18 of 42 pages
4. Checking and calibrating the air entrainment
4.1 Determining the initial pressure
To ensure that the air entrainment meter has the correct settings and will function properly,
please conduct the following checks:
a)
When there is no pressure in the air entrainment meter, the pointer of the
pressure gauge must lie on the marking after 100 % (see Section 7. Calibration
instructions, illustration no. 4). If the pointer does not lie over this marking, open
the threaded ring of the pressure gauge. Then hold the axis of the pointer
securely, and turn the screw on the opposite side of the pointer to move the
pointer to the marking after 100 %. Please look at the possibilities of results,
nos. I to III, in Section 4.2.
b)
The initial pressure is the pressure to which you have pumped up the air
entrainment meter before you begin testing. On the pressure-gauge scale, this
pressure is at the left of the zero point, and is marked by a red marking pointer.
This additional air volume will compensate for the loss of air volume during
testing of the air entrainment (this loss of air volume is due to the technical
design of the device). The initial pressure that applies to each device has
already been set and marked by the red marking pointer during factory testing,
before each air entrainment meter is shipped to its users.
For purposes of pre-setting, system characteristics require that the red marking pointer
must be placed in a position to the left of the zero point. To make this pre-setting, first
remove the threaded ring and the Plexiglas lens of the pressure gauge so that you can
move the marking pointer.
Please follow the steps below to make the correct setting of the red marking pointer:
1. Remove the upper part of the air entrainment meter (this is the part of the air
entrainment meter with the pressure-gauge mounting). Now, take the short tube that
is delivered with the air entrainment meter as part of the calibration kit, and insert it
from below into the hole that has been provided for the left ball shut-off valve (A).
2. Fill the test pot with water, up to the top.
3. Set the upper part of the air entrainment meter back onto its normal position. Place
the upper part of the unit back into place and turn it until the red points on the cover
are in line with each other (only for the 5; 7 and 8-litre air entrainment meters).
4. Fasten the upper part of the air entrainment meter firmly and airtight together with the
test pot by snapping down both of the two quick-release latches at the same time.
These clamps are located on opposite sides of the air entrainment meter.
5. Open the two ball shut-off valves (A and B). They are open when their levers are
