1-CUBE GMA Kurzanleitung

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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:

https://www.youtube.com/watch?v=z_M7LpkEv1Q

content, line up the pressure and temperature on the rotary

Carbonation Analyser for Beer and Cider

Digital Thermometer

INLET

Note the inlet tube

content in g/l

release PLUNGER