1-CUBE GMA Quick Manual

Quick Guide for using a 1-CUBE GMA Dissolved CO
Also read the User's Guide
Pressure Gauge
To start measuring the dissolved CO
It will help if you watch this YouTube video:
1) Direct the outlet hose to a suitable drain or waste beer collection container
2) To clean any debris from inside the tank outlet valve, open the tank sampling valve. Allow
beer to flow out to waste for a short time. Close the tank sampling valve.
3) Connect the inlet hose to the tank sampling valve. If necessary, secure with a clip or cable tie to
achieve a gas tight seal. Remember to allow for the pressure in the tank, it will be applied to the
hose.
4) Fully Open the tank sampling valve and Fully Open the GMA inlet valve
5) Gently Open the GMA outlet valve until beer starts to flow. Adjust the outlet valve until a slow
and steady flow is achieved to flush through and fill the chamber with new beer. Normally allow
the beer to flow for at least 30 seconds, and until the beer flows clear in the chamber.
6) Fully Close the GMA outlet valve. Then Fully close the inlet valve.
You now have your sample for analysis with the instrument, but the beer in the chamber is under
pressure, notice the gauge. This excess pressure must be released, otherwise our equilibrium pressure
reading will be wrong.
7) Open the outlet valve for a short time (about 1 sec.) Close the valve. Excess gas will have
released. The pressure should now be about zero or just above.
8) Rotate and unlock the black plunger on top of the GMA, so that the plunger can move up &
down. Notice the position of the white dot and the locked position.
9) Fully lift the plunger and push down hard, repeat for THREE full strokes in quick
succession. (Only three times. No more and no less!). NOTE: On each stroke you will see gas
being released from solution inside the chamber.
10) After the third down stroke rotate and lock the plunger
11) In theory partial pressure equilibrium has been reached. Notice how the pressure in the chamber
has increased. This is because dissolved gas has come out of solution.
12) Switch on the digital thermometer and read the temperature.
13) Read the pressure in kPa
14) To calculate the dissolve CO
nomogram on the base of the instrument. Read off the CO
NOTE: 1 g/l = 0.506 %vol. 1%vol = 1.976 g/l.
To measure another tank, re-connect the GMA and repeat the steps above. The new beer sample
will push out the previous beer.
Continued...please read on, cleaning is important!
GMA
by 1-CUBE
OUTLET
in a sample, first take a sample from a tank as follows:
2
https://www.youtube.com/watch?v=z_M7LpkEv1Q
content, line up the pressure and temperature on the rotary
2
Carbonation Analyser for Beer and Cider
2
CO
Digital Thermometer
INLET
Note the inlet tube
content in g/l
2
release PLUNGER
2