this is a quick guide to the gravimetric
functions on the Black Eagle espresso
machine there are three things I want to
cover today the first two buttons can be
preset to deliver a fixed amount of
liquid in the cup the third button is a
free flow button that allows you to brew
anything that you want to program a
button in the menu go to program doses
selected program doses again until it
asks you to select dose now all the
buttons will light up and at this point
you can program each of the two
programmable buttons on each group head
individually select the button you want
to program and then adjust using the
click wheel until you get your desired
weight in the cup at that point hit save
and that button is program that's all
it's - it is no need to brew ordering
additional than that you can set each
group head individually but I don't
recommend it what I would recommend is
when you've set the two buttons of one
group to go in to program doses and then
select to transfer that programming
across to a different group now the way
a gravimetric works is it's weighing
this process that's brewing and it's
waiting until it reaches a specific
weight to close the solenoid valve to
shut the group head off and the pump off
and to stop brewing what's important to
realize is that if it waited right until
you reached your target weight when it
hit stop there would be some overshoot
now the offsets are there to program the
machine to cut off a little bit earlier
to arrive at your desired dose now what
that offset is will vary so if you brew
a pre traditional old-school ristretto
type shot you'll need a pretty small
offset because the flow of the espresso
is pretty slow
so the amount of additional liquid that
will appear in the cup after you close
the valve is pretty small if you're
brewing more of a logo style shot then
that flow is a lot faster which means
that you'll need to shut off a little
bit earlier to get to your desired
weight so typically with longers you see
a higher offset and with ristretto style
shots you tend to see a lower upset if
you don't know what your style is I
would recommend starting with an off set
of three on some of the older machines
new machines come pre-programmed with an
off set of three but you still may need
to make small adjustments if you're
brewing and your machine is constantly
missing the weight that you're asking
for if you're asking for a thirty six
gram shot but you're always getting
thirty seven you're always getting too
much then if it's consistent then you
need to increase your offset by a single
gram that way it'll stop a little bit
earlier instead of getting to 37 it'll
stop at 36 if occasionally the machine
delivers an unusual amount more or less
that's a pretty good indicator that the
flow for that espresso was abnormal it
might be that somebody didn't dose
enough coffee into the portafilter and
the whole shot has run a little bit fast
so don't immediately make a change to
your offsets until you are getting a
consistent miss and at that point
correct by a known amount now in some of
the older machines this function is
still in Italian language despite the
fact that the machines by and large are
an English language you shouldn't need
to calibrate your machines very often at
all that after a year I still didn't
need to calibrate this machine but it's
important you understand how that
process works that's usually the last
setting inside the program doses menu
function once you select it it'll ask
you which group you wish to calibrate it
will then take you into another screen
where a hundred is flashing and this is
a good time to explain how this function
works the machine is gonna deliver what
it thinks is a hundred grams of liquid
you're gonna weigh that hundred grams of
liquid and tell the Machine what it
actually produced if it produced one
hundred and two
graham's then it will recalibrate itself
based on that inflammation so don't do
anything to the flashing hundred what
we're going to do is scroll down until
we select the group at this point it'll
confirm that you want to perform the
operation what's important here is that
you packed ground coffee into the
portafilter as if you were going to brew
an espresso don't do this with just
free-flowing water because the machine
will struggle with an unusual flow rate
to be accurate it needs the typical flow
rate that you find when you're brewing
espresso so make sure you load your
portafilter zero out a cup and then
confirm the operation and it will start
to brew once it's stopped take that cup
and weigh it hopefully you'll have about
a hundred grams if you don't you can
input that new number and that will
perform the calibration for that group
if you find the one group is off you may
wish to perform a calibration on the
second group but as I said this is an
extremely rare thing to have to do and
personally this machine has not needed
it in over a year if you have any
questions about using the gravimetric
function leave them in the comments
below I'll be happy to answer them
thanks